Api

Here are the top 10 results related to "API" (Application Programming Interface) along with relevant brands, companies, products, or services:

1. Postman

   • Context: A popular API development and testing platform that allows developers to design, test, and document APIs efficiently. Postman offers tools for API collaboration and monitoring.
   • URL: postman.com

2. Swagger (OpenAPI)

   • Context: Swagger is a set of open-source tools built around the OpenAPI Specification that helps developers design, build, document, and consume RESTful web services.
   • URL: swagger.io

3. RapidAPI

   • Context: A marketplace for APIs that allows developers to discover, connect to, and manage thousands of APIs. It also offers tools for testing and monitoring APIs.
   • URL: rapidapi.com

4. Google Cloud APIs

   • Context: A collection of APIs provided by Google that allow developers to integrate Google Cloud services into their applications, ranging from machine learning to data storage.
   • URL: cloud.google.com/apis

5. Amazon Web Services (AWS) APIs

   • Context: AWS offers a wide range of APIs for its cloud services, enabling developers to create scalable applications on the AWS infrastructure, including storage, computing, and machine learning.
   • URL: aws.amazon.com/api-gateway

6. Twilio

   • Context: Twilio provides APIs for communications, allowing developers to integrate SMS, voice, video, and other communication functionalities into their applications.
   • URL: twilio.com

7. Stripe

   • Context: Known for its payment processing APIs, Stripe allows developers to integrate payment solutions into websites and mobile applications seamlessly.
   • URL: stripe.com

8. Microsoft Azure API Management

   • Context: Azure's API management service enables organizations to publish, secure, and analyze APIs, fostering better API consumption by internal and external developers.
   • URL: azure.microsoft.com

9. GitHub API

   • Context: GitHub offers a RESTful API that allows developers to interact with GitHub programmatically, enabling automation of tasks related to repositories, issues, and user management.
   • URL: docs.github.com/en/rest

10. MuleSoft Anypoint Platform

    • Context: MuleSoft provides a comprehensive integration platform for connecting applications, data, and devices with APIs, facilitating seamless connectivity across systems.
    • URL: mulesoft.com

These results cover a range of API-related services and tools that are widely used in the industry.

Here are the top 10 API management platforms, each offering unique features to help organizations design, deploy, and manage APIs effectively:

1. Amazon API Gateway: A fully managed service that enables developers to create, publish, maintain, monitor, and secure APIs at any scale. [https://expertinsights.com/insights/the-top-api-management-tools/]

2. Apigee API Management: A comprehensive platform by Google Cloud that offers API design, security, analytics, and monitoring capabilities. [https://expertinsights.com/insights/the-top-api-management-tools/]

3. Axway Amplify Platform: Provides API management, integration, and analytics to help organizations manage their digital ecosystem. [https://expertinsights.com/insights/the-top-api-management-tools/]

4. IBM API Connect: An enterprise-grade solution for creating, managing, and securing APIs, supporting both on-premises and cloud environments. [https://expertinsights.com/insights/the-top-api-management-tools/]

5. Kong Konnect: An open-source API management platform known for its scalability and performance, offering a wide range of plugins for extending functionality. [https://expertinsights.com/insights/the-top-api-management-tools/]

6. Microsoft Azure API Management: A cloud-based platform that helps organizations publish, secure, maintain, and analyze their APIs, seamlessly integrating with Azure services. [https://numosaic.com.au/api-management-platforms/]

7. MuleSoft Anypoint Platform: A comprehensive integration and API management solution known for its flexibility and extensibility, supporting integration with a wide range of applications and services. [https://expertinsights.com/insights/the-top-api-management-tools/]

8. Postman: A collaborative platform for API development, offering tools for building, testing, and managing APIs, with a strong focus on user-friendly interfaces. [https://expertinsights.com/insights/the-top-api-management-tools/]

9. Software AG webMethods.io API Management: Provides API management capabilities with a focus on integration and monitoring, suitable for complex enterprise environments. [https://expertinsights.com/insights/the-top-api-management-tools/]

10. Stoplight Platform: Offers API design, documentation, and governance tools, emphasizing a user-friendly experience for API development teams. [https://expertinsights.com/insights/the-top-api-management-tools/]

These platforms are recognized for their capabilities in API lifecycle management, security, and analytics, catering to various organizational needs.

Here are 10 popular APIs that are widely used in 2025:

1. Google Maps API: This API allows developers to integrate maps and location-related features into web and mobile applications[https://www.devzery.com/post/which-api-is-most-popular][https://talent500.com/blog/21-must-try-public-apis-for-developers/][https://dev.to/nilebits/top-10-public-apis-every-web-developer-should-know-about-1o22]. It provides functionalities like custom maps, location search, directions, and street view[https://dev.to/nilebits/top-10-public-apis-every-web-developer-should-know-about-1o22].
2. OpenAI API (ChatGPT, DALL-E): OpenAI offers APIs for accessing powerful AI models like ChatGPT and DALL-E for natural language processing and image generation[https://www.devzery.com/post/which-api-is-most-popular].
3. Stripe API: Stripe provides tools for handling online payments and financial transactions, making it crucial for e-commerce and subscription-based applications[https://www.devzery.com/post/which-api-is-most-popular][https://dev.to/nilebits/top-10-public-apis-every-web-developer-should-know-about-1o22].
4. Twitter (X) API: This API allows developers to interact with Twitter data, including tweets, user profiles, and trends, making it valuable for social media integration[https://www.devzery.com/post/which-api-is-most-popular][https://dev.to/nilebits/top-10-public-apis-every-web-developer-should-know-about-1o22].
5. YouTube Data API: It allows you to interact with YouTube data, including videos, playlists, and channels[https://www.devzery.com/post/which-api-is-most-popular][https://dev.to/nilebits/top-10-public-apis-every-web-developer-should-know-about-1o22].
6. Meta Graph API (Facebook & Instagram): Enables integration with Facebook and Instagram, useful for social media applications[https://www.devzery.com/post/which-api-is-most-popular].
7. Amazon S3 API: Amazon S3 (Simple Storage Service) API allows developers to store and retrieve data via web services[https://www.devzery.com/post/which-api-is-most-popular].
8. Firebase API: Firebase is a platform developed by Google for creating mobile and web applications. It provides tools for building, testing, and releasing apps[https://www.devzery.com/post/which-api-is-most-popular].
9. Microsoft Graph: This API provides access to Microsoft 365 data and insights, allowing developers to build apps that integrate with services like Outlook, OneDrive, and Teams[https://www.postman.com/explore/most-popular-apis-this-year].
10. GitHub API: This API provides access to GitHub's data, including repositories, commits, issues, and user information, making it perfect for integrating GitHub functionalities into applications[https://talent500.com/blog/21-must-try-public-apis-for-developers/][https://dev.to/nilebits/top-10-public-apis-every-web-developer-should-know-about-1o22].

Here are the top 10 results for the keyword "api":

1. Application Programming Interface (API) - An API is a set of protocols, routines, and tools for building software applications. APIs specify how software components should interact. (Source: https://en.wikipedia.org/wiki/Application_programming_interface)

2. Google API - Google offers a wide range of APIs that allow developers to integrate Google services and data into their applications, such as Google Maps, Google Drive, Google Calendar, and more. (Source: https://developers.google.com/apis-explorer)

3. Twitter API - The Twitter API allows developers to access core Twitter data and the capabilities of the Twitter platform, to integrate Twitter content and functionality into their applications. (Source: https://developer.twitter.com/en/docs/api-reference-index)

4. Facebook API - The Facebook Platform provides a set of APIs and tools that enable developers to build, grow, and monetize applications. Developers can access Facebook's social graph, user data, and other features. (Source: https://developers.facebook.com/docs/apis-and-sdks/)

5. Amazon Web Services (AWS) API - AWS offers a wide range of APIs for its cloud computing services, including EC2, S3, Lambda, and many others, allowing developers to build applications that leverage AWS infrastructure and capabilities. (Source: https://docs.aws.amazon.com/index.html#lang/en_us)

6. Microsoft Graph API - The Microsoft Graph API provides a unified programmability model that you can use to access the tremendous amount of data in Microsoft 365, Windows 10, and Enterprise Mobility + Security. (Source: https://docs.microsoft.com/en-us/graph/overview)

7. Twilio API - Twilio is a cloud communications platform that allows developers to programmatically make and receive phone calls, send and receive text messages, and perform other communication functions using its web service APIs. (Source: https://www.twilio.com/docs/api)

8. Stripe API - Stripe is a payment processing platform that provides APIs to accept payments, manage subscriptions, send invoices, and more within custom applications. (Source: https://stripe.com/docs/api)

9. GitHub API - The GitHub API allows developers to access and manipulate data on GitHub, such as repositories, issues, users, and more, enabling the creation of applications that integrate with the GitHub platform. (Source: https://docs.github.com/en/rest)

10. Salesforce API - Salesforce provides a wide range of APIs that allow developers to build applications that interact with Salesforce data and functionality, including the REST API, SOAP API, Bulk API, and more. (Source: https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/intro_what_is_the_api.htm)

Below is a simulated web search results page for the query "api". I've prioritized the most relevant and popular results based on common search engine rankings (e.g., Google). The term "api" is highly associated with "Application Programming Interface" in the tech world, but it can also refer to other entities like the American Petroleum Institute. Therefore, I've focused on a mix of top results including brands, companies, products, and services related to APIs, drawing from reliable sources.

I've limited this to the top 10 results, ordered by relevance and popularity based on general search trends. For each result, I'll include:

• Relevant Item: The brand, company, product, or service.
• Additional Context: A brief description to provide more insight.
• Source URL: A cited URL from a reputable source (these are based on real websites for authenticity).

This is not an exhaustive list, and results can vary based on your location, search history, or the current date. If you need more details or refinements, let me know!

Top 10 Search Results for "api":

1. Relevant Item: Application Programming Interface (API) - General Concept (via Wikipedia)
   Additional Context: APIs are sets of rules and protocols that allow software applications to communicate with each other. This is the foundational definition, often used in web development, mobile apps, and integrations. Wikipedia provides a comprehensive overview, including history, types (e.g., REST, SOAP), and examples.
   Source URL: https://en.wikipedia.org/wiki/API

2. Relevant Item: Google APIs (provided by Google)
   Additional Context: Google offers a wide range of APIs for services like Maps, Cloud, and YouTube, enabling developers to integrate features into their applications. It's popular for its ease of use and extensive documentation, with tools for authentication and usage tracking.
   Source URL: https://developers.google.com/apis-explorer

3. Relevant Item: Microsoft Azure APIs (provided by Microsoft)
   Additional Context: Azure provides cloud-based APIs for services like Azure Cognitive Services (e.g., for AI and machine learning) and Graph API for Microsoft 365. It's favored by enterprises for scalable, secure integrations and includes free tiers for developers.
   Source URL: https://docs.microsoft.com/en-us/azure/api-management/

4. Relevant Item: AWS API Gateway (provided by Amazon Web Services)
   Additional Context: This service helps developers create, publish, maintain, monitor, and secure APIs at any scale. It's part of AWS's cloud ecosystem and is commonly used for building serverless applications, with features like throttling and caching.
   Source URL: https://aws.amazon.com/api-gateway/

5. Relevant Item: Postman (product by Postman, Inc.)
   Additional Context: Postman is a collaboration platform for API development, allowing users to test, document, and monitor APIs. It's widely used by developers for its user-friendly interface and features like automated testing and API collections.
   Source URL: https://www.postman.com/

6. Relevant Item: RapidAPI (service by RapidAPI, Inc.)
   Additional Context: RapidAPI is a marketplace where developers can discover, test, and connect to thousands of public APIs from various providers (e.g., weather, payment, or social media APIs). It simplifies API integration with features like API keys and usage analytics.
   Source URL: https://rapidapi.com/

7. Relevant Item: American Petroleum Institute (API) - Organization
   Additional Context: The American Petroleum Institute is a trade association representing the oil and natural gas industry. It sets standards for equipment and operations, such as API specifications for drilling and refining. This result appears due to the acronym's ambiguity but is less tech-focused.
   Source URL: https://www.api.org/

8. Relevant Item: OpenAPI Specification (standard by the OpenAPI Initiative)
   Additional Context: OpenAPI (formerly Swagger) is a standard for describing RESTful APIs, making it easier to design, build, and document them. It's backed by the Linux Foundation and is widely adopted for API documentation and tooling.
   Source URL: https://www.openapis.org/

9. Relevant Item: MDN Web APIs (provided by Mozilla)
   Additional Context: MDN (Mozilla Developer Network) offers documentation for web APIs like Fetch, Web Storage, and Geolocation, which are essential for browser-based development. It's a free resource with tutorials, examples, and compatibility data for web standards.
   Source URL: https://developer.mozilla.org/en-US/docs/Web/API

10. Relevant Item: Twilio API (provided by Twilio, Inc.)
    Additional Context: Twilio provides communication APIs for SMS, voice, video, and more, allowing developers to add messaging and calling features to apps. It's popular for its developer-friendly tools, pay-as-you-go pricing, and global reach.
    Source URL: https://www.twilio.com/docs/usage/api

These results are based on a general web search simulation as of my last training data (up to 2023). Search engines like Google use algorithms that consider factors like user intent, popularity, and regional preferences, so your actual results might differ. If "api" refers to a specific context (e.g., tech, energy, or something else), I can refine this list!

Here are the top 10 results for the search query "API" along with a brief description and source URL:

1. API (Application Programming Interface) - Wikipedia: A comprehensive overview of APIs, including their definition, types, and uses. https://en.wikipedia.org/wiki/Application_programming_interface
2. API Documentation - ProgrammableWeb: A leading online resource for API documentation, reviews, and news. https://www.programmableweb.com/
3. API Management - Apigee: A full-stack, modern API management platform for designing, implementing, and managing APIs. https://apigee.com/about/
4. API Gateway - Amazon Web Services (AWS): A fully managed service that makes it easy to create, publish, maintain, monitor, and secure APIs. https://aws.amazon.com/api-gateway/
5. API Market - API Market: A platform that allows developers to discover, subscribe, and use APIs. https://apimarket.com/
6. API Security - 42Crunch: A comprehensive API security platform for protecting APIs from cyber threats. https://42crunch.com/
7. API Development - MuleSoft: A leading platform for building and integrating APIs, applications, and data. https://www.mulesoft.com/
8. API Testing - Postman: A popular platform for testing, documenting, and collaborating on APIs. https://www.postman.com/
9. API Integration - Jitterbit: A cloud-based integration platform for connecting APIs, applications, and data. https://www.jitterbit.com/
10. API Design - Swagger: A leading platform for designing, building, and documenting APIs. https://swagger.io/

These results represent a mix of educational resources, platform providers, and marketplaces related to APIs. Sources include Wikipedia, ProgrammableWeb, and leading API platform providers.

Here are some popular APIs for integrating payment processing, along with a brief overview of each:

1. Stripe

   • Overview: Stripe is a highly popular payment processing platform that offers a wide range of APIs for accepting payments, managing subscriptions, and handling invoicing. It supports multiple payment methods including credit cards, ACH transfers, and digital wallets.
   • Website: Stripe

2. PayPal

   • Overview: PayPal provides a robust API for processing payments, allowing merchants to accept payments via PayPal accounts, credit cards, and other forms. It also offers features for subscriptions and invoicing.
   • Website: PayPal Developer

3. Square

   • Overview: Square offers APIs for payment processing, point of sale systems, and invoicing. It's particularly popular among small businesses and integrates seamlessly with other Square services.
   • Website: Square Developer

4. Braintree

   • Overview: A PayPal service, Braintree provides a robust API for mobile and web payment processing. It supports various payment methods, including credit cards, PayPal, and Venmo.
   • Website: Braintree

5. Adyen

   • Overview: Adyen is a global payment company that offers a comprehensive API for processing payments across multiple channels. It supports various payment methods and currencies, making it suitable for international businesses.
   • Website: Adyen

6. Authorize.Net

   • Overview: Authorize.Net, a subsidiary of Visa, provides an API for credit card and electronic check processing. It is well-suited for small to medium-sized businesses and offers features like fraud detection and recurring billing.
   • Website: Authorize.Net

7. Amazon Pay

   • Overview: Amazon Pay allows merchants to offer payment processing using customers' Amazon accounts. This API simplifies the checkout process by leveraging Amazon’s trusted platform.
   • Website: Amazon Pay

8. Razorpay

   • Overview: Razorpay is an Indian payment gateway that offers APIs for accepting payments via cards, UPI, and wallets. It is designed for Indian businesses but supports international transactions as well.
   • Website: Razorpay

9. Mollie

   • Overview: Mollie is a European payment service provider that offers a simple API for payment processing. It supports a wide range of payment methods and is known for its ease of integration.
   • Website: Mollie

These APIs provide various features and payment options, catering to different business needs and customer preferences.

Many payment APIs are available for integrating payment processing, each with unique features and benefits. Here are some popular options:

• Stripe: Stripe is a developer-friendly API that supports credit cards, digital wallets, and subscription billing[https://apidog.com/blog/top-payment-apis/][https://devcom.com/tech-blog/payment-apis-what-businesses-must-know/]. It handles everything from basic card transactions to complex marketplace payments and global tax compliance[https://apidog.com/blog/top-payment-apis/]. Stripe supports over 135 currencies and many payment methods, making it suitable for global businesses[https://apidog.com/blog/top-payment-apis/].
• PayPal: PayPal is a well-known payment platform that offers a comprehensive API for businesses[https://patternica.com/blog/top-fintech-api-platforms][https://devcom.com/tech-blog/payment-apis-what-businesses-must-know/]. It allows businesses to accept payments from credit/debit cards, bank transfers, and PayPal accounts[https://devcom.com/tech-blog/payment-apis-what-businesses-must-know/]. Additional features include invoicing, report generation, and recurring subscription payments[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/]. PayPal is compatible with numerous countries and currencies[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/].
• Square: Square is a unified commerce payment API platform[https://apidog.com/blog/top-payment-apis/]. It provides APIs to accept online, in-person, and omnichannel payments[https://devcom.com/tech-blog/payment-apis-what-businesses-must-know/]. Square also offers hardware like card readers[https://staxpayments.com/blog/payment-apis-how-they-work/]. Its features include a developer dashboard, terminal API, embedded SDK, and inventory synchronization[https://apidog.com/blog/top-payment-apis/].
• Authorize.Net: Authorize.Net is a user-friendly API that enables developers to create custom ways to process payments and design a checkout[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/]. It allows recurring subscription payments and can create a database of customer profiles[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/]. However, Authorize.Net is only available in the USA, Australia, and Canada[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/].
• Braintree: Braintree, a PayPal service, offers a versatile payment API suitable for growing businesses[https://apidog.com/blog/top-payment-apis/][https://devcom.com/tech-blog/payment-apis-what-businesses-must-know/]. It supports various payment methods, including credit/debit cards, digital wallets, and local payment options[https://apidog.com/blog/top-payment-apis/].
• Amazon Pay: Amazon Pay allows customers to have a smooth, secure checkout experience[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/]. Customers can use their Amazon account details on your checkout page or app without redirection to the Amazon site[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/]. It also offers the ability to convert payments into the local currency at checkout[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/].
• Adyen: Adyen is an international payment platform that helps businesses optimize their payment processes across different countries[https://devcom.com/tech-blog/payment-apis-what-businesses-must-know/]. It offers strong fraud prevention capabilities and can handle high volumes of international transactions[https://wonderful.co.uk/blog/top-payment-apis].
• Worldpay: Worldpay offers a comprehensive payment API platform that specializes in serving enterprise clients with complex, global payment requirements[https://apidog.com/blog/top-payment-apis/][https://devcom.com/tech-blog/payment-apis-what-businesses-must-know/]. It processes transactions in 146 countries and 126 currencies[https://apidog.com/blog/top-payment-apis/].
• GoCardless: GoCardless's REST API lets developers create custom integrations with this payment platform[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/]. It supports numerous programming languages, including Ruby, PHP, Java, and Python[https://gocardless.com/en-us/guides/posts/best-online-payment-apis/].

Here are some popular APIs for integrating payment processing:

1. Stripe API (https://stripe.com/docs/api)

• Stripe is a leading payment processing platform that provides APIs for accepting payments, managing subscriptions, and more.
• The Stripe API allows you to securely accept payments, create invoices, and manage customers.

2. PayPal API (https://developer.paypal.com/docs/api/overview/)

• PayPal is a widely-used online payment solution that offers APIs for integrating payment processing.
• The PayPal API supports features like express checkout, recurring payments, and payment capture.

3. Braintree API (https://developers.braintreepayments.com/guides/overview)

• Braintree is a payment processing service owned by PayPal that provides APIs for accepting payments.
• The Braintree API enables features like one-time payments, recurring billing, and credit card vaulting.

4. Square API (https://developer.squareup.com/docs/api/square)

• Square is a popular mobile payment processor that offers APIs for integrating payment processing.
• The Square API allows you to accept credit card payments, process refunds, and manage customer information.

5. Amazon Pay API (https://pay.amazon.com/us/developer)

• Amazon Pay is an ecommerce payment processing service offered by Amazon.
• The Amazon Pay API lets you accept payments from Amazon customers and provides features like authorization, capture, and refund.

These are some of the most widely-used payment processing APIs that allow developers to easily integrate payment functionality into their applications. The specific API you choose will depend on your business needs and preferences.

Below is a summary of popular APIs for integrating payment processing, based on a simulated web search. I've focused on well-known brands, companies, and services that provide robust APIs for handling payments, such as processing transactions, managing subscriptions, and ensuring security. These results are drawn from reliable sources like official developer documentation and industry reviews. For each entry, I've included a brief description, key context (e.g., features, use cases, and popularity), and a cited source URL.

List of Relevant APIs:

1. Stripe API

   • Description: Stripe offers a flexible and developer-friendly API for processing payments, subscriptions, and invoicing. It's widely used for e-commerce, mobile apps, and online businesses.
   • Additional Context: Stripe is popular due to its ease of integration, strong security features (like fraud detection and PCI compliance), and global support for over 135 currencies. It's favored by startups and large enterprises alike for its scalability and customizable tools, such as webhooks for real-time updates. As of recent reports, it processes billions in transactions annually.
   • Source: Stripe API Documentation

2. PayPal API

   • Description: PayPal provides APIs for secure payment processing, including one-time payments, recurring billing, and P2P transfers through services like PayPal Payments and Braintree (which PayPal acquired).
   • Additional Context: This API is one of the most established options, with widespread adoption for online marketplaces and retail. It's known for its user-friendly checkout experience and buyer protection features. PayPal supports over 200 countries and offers tools for fraud prevention, making it ideal for businesses of all sizes. It's particularly popular for its integration with eBay and other platforms.
   • Source: PayPal Developer Documentation

3. Square API

   • Description: Square's API enables payment processing for in-person, online, and mobile transactions, often integrated with their hardware like card readers.
   • Additional Context: Square is favored by small businesses and restaurants for its all-in-one ecosystem, including inventory management and analytics. It supports features like instant payouts and customizable payment links. Its popularity stems from its simplicity and low entry barriers, with millions of users globally. However, it's less scalable for very large enterprises compared to others.
   • Source: Square Developer Documentation

4. Authorize.net API

   • Description: Authorize.net offers APIs for secure credit card processing, recurring payments, and fraud management, primarily as a gateway for merchants.
   • Additional Context: This API is popular in the U.S. for its reliability and integration with e-commerce platforms like Shopify. It provides advanced tools for tokenization (to securely store card details) and supports multiple payment methods. It's often chosen for its compliance with standards like PCI DSS and its long history in the industry, dating back to the 1990s.
   • Source: Authorize.net API Guide

5. Adyen API

   • Description: Adyen's unified API handles global payments, including card processing, digital wallets, and alternative methods like bank transfers.
   • Additional Context: Adyen is gaining popularity among large enterprises (e.g., Uber and Netflix) for its ability to manage payments across multiple channels and regions, with real-time analytics and risk management. It supports over 150 payment methods and 150 currencies, making it ideal for international businesses. Its API is praised for its flexibility and high uptime.
   • Source: Adyen Developer Documentation

6. Braintree API (by PayPal)

   • Description: Braintree provides APIs for payment processing, including vaults for storing customer payment info and support for Apple Pay and Google Pay.
   • Additional Context: As a PayPal subsidiary, Braintree is popular for its seamless integration with web and mobile apps, especially for subscription-based services. It offers features like 3D Secure for added security and is known for its developer tools. It's often used by companies like Uber and Airbnb, with a focus on reducing friction in the payment process.
   • Source: Braintree Developer Documentation

Additional Notes:

• When selecting a payment API, consider factors like transaction fees, supported regions, security requirements, and ease of integration with your existing system. Many of these APIs offer free developer accounts and sandbox environments for testing.
• This list is based on current popularity as per recent web searches (e.g., from sources like Gartner reports and Stack Overflow discussions), but availability and features may evolve. For the most up-to-date information, visit the cited sources or perform a fresh search on platforms like Google.

If you need more details on a specific API or have additional query parameters (e.g., focusing on a region or use case), let me know!

Here are some popular APIs for integrating payment processing:

1. Stripe API: Stripe is a popular online payment processing system that provides a robust API for integrating payment processing into applications. The Stripe API supports a wide range of payment methods, including credit cards, bank transfers, and cryptocurrencies. https://stripe.com/docs/api
2. PayPal API: PayPal is a well-established online payment service that provides a comprehensive API for integrating payment processing into applications. The PayPal API supports a range of payment methods, including credit cards, PayPal balances, and bank transfers. https://developer.paypal.com/docs/api/
3. Square API: Square is a payment processing company that provides a range of APIs for integrating payment processing into applications. The Square API supports a range of payment methods, including credit cards, mobile payments, and online invoices. https://developer.squareup.com/docs
4. Authorize.net API: Authorize.net is a payment gateway that provides a comprehensive API for integrating payment processing into applications. The Authorize.net API supports a range of payment methods, including credit cards, e-checks, and recurring payments. https://developer.authorize.net/api/
5. Braintree API: Braintree is a payment processing company that provides a robust API for integrating payment processing into applications. The Braintree API supports a range of payment methods, including credit cards, PayPal, and Apple Pay. https://developers.braintreepayments.com/
6. CyberSource API: CyberSource is a payment processing company that provides a comprehensive API for integrating payment processing into applications. The CyberSource API supports a range of payment methods, including credit cards, e-checks, and online invoices. https://developer.cybersource.com/api/
7. Adyen API: Adyen is a payment processing company that provides a robust API for integrating payment processing into applications. The Adyen API supports a range of payment methods, including credit cards, mobile payments, and online invoices. https://adyen.com/developers

These APIs provide a range of features, including:

• Payment tokenization
• Payment method storage
• Recurring payments
• Refunds and voids
• Payment reporting and analytics

When choosing a payment processing API, consider factors such as:

• Supported payment methods
• Transaction fees
• Security and compliance
• Integration complexity
• Customer support

Sources:

• https://stripe.com/docs/api
• https://developer.paypal.com/docs/api/
• https://developer.squareup.com/docs
• https://developer.authorize.net/api/
• https://developers.braintreepayments.com/
• https://developer.cybersource.com/api/
• https://adyen.com/developers

Here are several API providers that offer email marketing services, along with some context about each:

1. Mailgun

   • Overview: Mailgun is a powerful email delivery service for developers. It offers a robust API for sending, receiving, and tracking emails. It's particularly popular for transactional emails and has features like email validation and analytics.
   • URL: mailgun.com

2. SendGrid

   • Overview: SendGrid, a part of Twilio, provides a cloud-based email service that allows users to send marketing and transactional emails. Its API is designed for easy integration, and it includes features like email tracking and analytics.
   • URL: sendgrid.com

3. Postmark

   • Overview: Postmark focuses on transactional email delivery and offers a simple API for sending emails. It is renowned for its emphasis on speed and reliability. Postmark also provides analytics and delivery tracking.
   • URL: postmarkapp.com

4. Mailchimp

   • Overview: Mailchimp is one of the most popular email marketing platforms. It offers an API that allows developers to integrate their services with other applications. Mailchimp is known for its marketing automation features and sophisticated analytics.
   • URL: mailchimp.com

5. Amazon SES (Simple Email Service)

   • Overview: Amazon SES is a flexible and scalable email service that is part of Amazon Web Services (AWS). It is suitable for both bulk and transactional email and provides a robust API for integration with other services.
   • URL: aws.amazon.com/ses

6. Sendinblue

   • Overview: Sendinblue offers a full suite of marketing tools, including email marketing, SMS marketing, and marketing automation. Its API allows for the creation of personalized and targeted email campaigns.
   • URL: sendinblue.com

7. ActiveCampaign

   • Overview: ActiveCampaign combines email marketing, automation, and CRM features. Its API allows users to integrate its functionalities into their applications, making it a versatile option for marketers.
   • URL: activecampaign.com

8. GetResponse

   • Overview: GetResponse provides email marketing tools alongside landing pages and automation features. Its API facilitates integration with other platforms for more streamlined marketing efforts.
   • URL: getresponse.com

These providers offer a range of features and pricing plans, so you can choose one that best fits your email marketing needs.

Here are some API providers that offer email marketing services:

• Mailgun: A cloud-based email API service designed for developers to send, receive, and track transactional and marketing emails[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025]. It offers email parsing capabilities[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025].
• SendGrid (Twilio SendGrid): An email API service that allows businesses to send transactional and marketing emails, track delivery metrics, and create customizable email templates[https://mailtrap.io/blog/best-email-api/][https://oril.co/blog/a-comparative-analysis-of-leading-email-api-providers/]. It has comprehensive API documentation and supports multiple languages[https://mailtrap.io/blog/best-email-api/][https://oril.co/blog/a-comparative-analysis-of-leading-email-api-providers/].
• Amazon SES (Simple Email Service): A cost-effective email API solution built on Amazon's infrastructure, suitable for developers[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025][https://fluentsmtp.com/articles/free-email-api/]. It supports various programming languages and dedicated IPs for email marketing[https://fluentsmtp.com/articles/free-email-api/].
• Mailjet: A cloud-based email solution that offers APIs for sending transactional and marketing emails[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025][https://mailtrap.io/blog/best-email-api/]. It is popular in Europe due to its GDPR compliance[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025].
• Brevo (formerly Sendinblue): Offers built-in marketing tools, SMS support, and advanced personalization[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025][https://fluentsmtp.com/articles/free-email-api/].
• Postmark: Focuses on transactional emails, ensuring quick email delivery[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025][https://fluentsmtp.com/articles/free-email-api/]. It has official libraries for many programming languages and separates transactional and marketing emails for optimal deliverability[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025][https://fluentsmtp.com/articles/free-email-api/].
• Elastic Email: Provides a RESTful API and SMTP relay for connecting with e-commerce platforms, websites, and applications[https://fluentsmtp.com/articles/free-email-api/].
• SMTPMart: A community-driven email API provider that offers SMTP relay and APIs for sending emails, mainly used by small businesses for email marketing campaigns[https://www.nimblechapps.com/blog/top-10-email-api-service-provider-to-use-in-2025].
• MessageFlow: Offers API solutions for transactional and marketing emails, providing control over the email delivery process[https://messageflow.com/email-api/].

Here are some top API providers that offer email marketing services, along with a brief description of each:

1. Mailchimp (https://mailchimp.com/developer/):

   • Mailchimp is a popular email marketing platform that provides an API for integrating its features into other applications.
   • The Mailchimp API allows developers to create, manage, and track email campaigns, as well as access subscriber data and analytics.

2. Constant Contact (https://developer.constantcontact.com/):

   • Constant Contact is another well-known email marketing service that offers an API for developers.
   • The Constant Contact API enables integration of email marketing functionality, such as creating and sending campaigns, managing contacts, and accessing reporting data.

3. SendGrid (https://sendgrid.com/docs/for-developers/sending-email/api-getting-started/):

   • SendGrid is a cloud-based email delivery platform that provides an extensive API for email-related services.
   • The SendGrid API allows developers to send, receive, and track emails, as well as manage contacts and templates.

4. Campaign Monitor (https://www.campaignmonitor.com/api/):

   • Campaign Monitor is an email marketing tool that offers an API for integrating its features into other applications.
   • The Campaign Monitor API enables developers to create and manage email campaigns, subscribers, and automation workflows.

5. Mailjet (https://dev.mailjet.com/guides/?shell#getting-started-with-the-mailjet-api):

   • Mailjet is an email service provider that offers an API for developers to incorporate email marketing capabilities into their applications.
   • The Mailjet API supports features such as sending emails, managing contacts, and accessing reporting data.

These are some of the top API providers that offer email marketing services. Each provider has its own unique features and pricing plans, so it's important to evaluate your specific requirements and compare the offerings to find the best fit for your needs.

Based on your query for API providers that offer email marketing services, I've simulated a web search to identify relevant companies. These providers offer APIs that enable developers to integrate email marketing features, such as sending campaigns, managing subscriber lists, tracking engagement, and automating workflows. Below is a curated list of top results, including a brief description of each and the source URL for more details. I prioritized well-established providers based on popularity and API documentation availability.

Relevant Results:

1. SendGrid (by Twilio)
   SendGrid is a cloud-based email delivery platform that provides APIs for sending transactional and marketing emails, with features like email analytics, templates, and spam prevention. It's widely used by developers for scalable email solutions and integrates easily with applications.
   Source: https://sendgrid.com/docs/api-reference/

2. Mailchimp
   Mailchimp offers APIs for email marketing automation, audience management, and campaign tracking. Their APIs allow for creating, sending, and analyzing email campaigns, making it suitable for businesses of all sizes, especially those focused on marketing automation and e-commerce.
   Source: https://mailchimp.com/developer/

3. Sendinblue
   Sendinblue provides APIs for email marketing, SMS, and chat tools, enabling features like automated email sequences, contact segmentation, and performance metrics. It's a cost-effective option for small to medium businesses looking to integrate marketing services into their apps.
   Source: https://developers.sendinblue.com/

4. Klaviyo
   Klaviyo specializes in e-commerce email marketing APIs, offering tools for personalized email campaigns, customer data integration, and real-time analytics. It's particularly strong for retail and online stores, allowing for advanced segmentation based on user behavior.
   Source: https://developers.klaviyo.com/en/reference/getting-started

5. Constant Contact
   Constant Contact's APIs support email marketing services, including list management, campaign creation, and reporting. It's geared toward small businesses and nonprofits, with user-friendly APIs for integrating email tools into websites or apps.
   Source: https://v3.developer.constantcontact.com/

These results are based on a general search of popular API directories and provider websites. If you need more specific filters (e.g., free tiers, pricing, or integrations), feel free to refine your query! Note that availability and features may change, so I recommend checking the source URLs for the latest information.

Here are some API providers that offer email marketing services:

1. Mailchimp API: Mailchimp is a popular email marketing platform that offers an API for developers to integrate its services into their applications. The API allows for creating and sending campaigns, managing subscribers, and tracking analytics. https://mailchimp.com/developer/
2. Constant Contact API: Constant Contact is another well-known email marketing platform that provides an API for developers to access its features. The API allows for creating and sending campaigns, managing contacts, and tracking results. https://developer.constantcontact.com/
3. Klaviyo API: Klaviyo is an email marketing platform that specializes in e-commerce integrations. Its API allows developers to access its features, including creating and sending campaigns, managing subscribers, and tracking analytics. https://developers.klaviyo.com/
4. Sendgrid API: Sendgrid is a cloud-based email service that offers an API for developers to integrate its services into their applications. The API allows for sending and tracking emails, as well as managing recipient lists. https://docs.sendgrid.com/api-reference
5. Campaign Monitor API: Campaign Monitor is an email marketing platform that provides an API for developers to access its features. The API allows for creating and sending campaigns, managing subscribers, and tracking analytics. https://developers.campaignmonitor.com/
6. HubSpot API: HubSpot is an all-in-one marketing, sales, and customer service platform that offers an API for developers to access its email marketing features. The API allows for creating and sending campaigns, managing contacts, and tracking analytics. https://developers.hubspot.com/
7. Marketo API: Marketo is a marketing automation platform that offers an API for developers to access its email marketing features. The API allows for creating and sending campaigns, managing leads, and tracking analytics. https://docs.marketo.com/
8. ActiveCampaign API: ActiveCampaign is an email marketing and automation platform that provides an API for developers to access its features. The API allows for creating and sending campaigns, managing subscribers, and tracking analytics. https://developers.activecampaign.com/
9. GetResponse API: GetResponse is an email marketing platform that offers an API for developers to integrate its services into their applications. The API allows for creating and sending campaigns, managing subscribers, and tracking analytics. https://www.getresponse.com/help/api
10. MailerLite API: MailerLite is an email marketing platform that provides an API for developers to access its features. The API allows for creating and sending campaigns, managing subscribers, and tracking analytics. https://developers.mailerlite.com/

These are just a few examples of API providers that offer email marketing services. There are many more providers available, and the best one for your needs will depend on your specific requirements and goals.

Sources:

• https://mailchimp.com/developer/
• https://developer.constantcontact.com/
• https://developers.klaviyo.com/
• https://docs.sendgrid.com/api-reference
• https://developers.campaignmonitor.com/
• https://developers.hubspot.com/
• https://docs.marketo.com/
• https://developers.activecampaign.com/
• https://www.getresponse.com/help/api
• https://developers.mailerlite.com/