The 10 best API affiliate programs in 2026

Double Zero is an open-source email infrastructure platform that empowers users to fully own and control their email sending capabilities. Designed to simplify the deployment and management of email services, Double Zero provides an easy-to-use email API for sending transactional emails and supports advanced features like broadcasts and automations through its Pro version. With single-command deployment using SST, seamless setup of AWS services (SES, SNS, SQS, EC2, S3, Route 53), and a straightforward REST or JS API, users can quickly establish robust, scalable email infrastructure without relying on traditional third-party providers. The platform also offers features such as multi-recipient tracking, a WYSIWYG editor, SMTP endpoints, contact and list management, and team collaboration tools.

Double Zero is ideal for developers, SaaS businesses, and organizations seeking greater control, transparency, and cost-efficiency in their email operations. It stands out for its open and modifiable codebase, affordable pricing, and the ability to deploy within your own cloud environment, making it a compelling choice for privacy-conscious users and those looking to avoid vendor lock-in. Affiliates will find Double Zero attractive to promote, as it addresses a growing demand for customizable, developer-friendly email solutions that balance ease of use with full ownership and transparency.

LocalCan is a developer tool designed to streamline the process of exposing local applications to the internet or local networks using user-friendly public URLs and .local domains. It enables developers to instantly publish their localhost projects with secure, persistent public URLs, making it simple to share work with clients, test webhooks, OAuth integrations, and access apps across devices without complex configuration. With unlimited .local domains, automatic HTTPS, and robust traffic inspection and replay capabilities, LocalCan offers a seamless workflow for web and SaaS developers who need to test, debug, and collaborate efficiently. It stands out as a top alternative to tools like Ngrok, praised for its ease of use and reliability, and supports a broad range of frameworks, including Next.js, Vite, Laravel, Node.js, and more.

This tool is ideal for individual developers, small teams, and agencies who regularly build, test, or demo web applications and require quick, secure ways to expose local projects. Affiliates will find LocalCan attractive to promote due to its strong word-of-mouth reputation, time-saving features, and straightforward pricing, making it a compelling solution for developers seeking to simplify their development and testing processes.

Reffresh.com is a user-friendly platform that enables developers and teams to quickly create mock APIs without any coding required. Designed to streamline the development and testing process, Reffresh.com allows users to set up customizable API endpoints in just a few clicks, making it easy to simulate real-world scenarios and accelerate product development. The service emphasizes simplicity and efficiency, offering an intuitive interface that eliminates the need for complex configurations or technical expertise.

This solution is ideal for software developers, QA testers, and project managers who need reliable mock APIs for prototyping, testing, or demonstrating applications. Affiliates will find Reffresh.com an attractive product to promote due to its broad appeal across technical and non-technical audiences, its focus on saving time and reducing development friction, and its potential to become an essential tool in any modern development workflow.

InvoicingAPI is a versatile and developer-friendly invoicing platform designed to make creating, customizing, and managing invoices seamless for businesses of all sizes. With support for global tax regulations, a robust library of customizable templates, and the ability to generate beautifully formatted PDF invoices via a simple API call, InvoicingAPI streamlines the entire invoicing process. Users can invoice clients in any currency, integrate payment links for faster transactions, and manage payments, refunds, and payouts from an intuitive dashboard—all while enjoying a generous free tier and no fees on payments. The platform is platform-independent, supports unlimited app integrations with a single API key, and offers built-in safeguards to prevent accidental request overloads.

InvoicingAPI is a perfect solution for SaaS providers, e-commerce businesses, marketplaces, consultants, POS systems, and CRM developers looking to add dynamic, tax-compliant invoicing without heavy development overhead. Its ease of integration, high degree of customization, and focus on security and scalability make it an excellent choice for affiliates to promote, appealing to a broad audience of businesses seeking efficient and reliable invoicing solutions.

Infography is an AI-powered platform that transforms blog posts and complex content into visually compelling, shareable infographics in just seconds. By leveraging advanced language models and intuitive design tools, Infography eliminates the traditional hassle of research, design planning, and manual graphic creation, delivering professional-quality visuals at a fraction of the time and cost. Users can input a blog link, topic, or content prompt, and the platform automatically generates eye-catching infographics with customizable branding options, support for over 100 languages, and seamless API integration for content platforms and marketing tools.

Ideal for content creators, marketers, bloggers, educators, and agencies looking to boost engagement, simplify information, and increase the shareability of their content, Infography stands out as a powerful solution for repurposing and amplifying existing material. Affiliates will find this tool particularly appealing to promote thanks to its broad use cases, cost-effectiveness, and strong appeal to a rapidly growing creator economy eager for time-saving and results-driven content solutions.

Pintura Image Editor is a robust JavaScript SDK designed to seamlessly integrate advanced image editing capabilities into any web application. Fully configurable and highly intuitive across both mobile and desktop platforms, Pintura empowers users to crop, rotate, resize, filter, annotate, and adjust images directly in the browser. With features like enforced crop aspect ratios, fast in-browser uploads with compression and resizing, overlay crop guides, automatic watermarking, and powerful annotation tools, Pintura offers everything needed for professional image editing. Its responsive and accessible interface ensures a smooth experience on any device, while extensive customization options let developers tailor the editor to fit specific project needs.

Pintura is ideal for developers, SaaS providers, and businesses that require high-quality user-generated images, such as social platforms, e-commerce sites, and content creation tools. With support for all major JavaScript frameworks, popular file upload libraries, and modern web technologies, it integrates quickly and easily into new or existing projects. Affiliates will find Pintura an attractive product to promote thanks to its wide applicability, developer-friendly setup, and the significant value it delivers by saving countless development hours and elevating the quality of image uploads for end users.

Magestic is a no-code platform designed to help businesses rapidly build custom back-office applications without the need for developers. Using an intuitive drag-and-drop builder, users can create tailored user interfaces that connect seamlessly to a variety of popular APIs. Magestic allows you to build pages, lists, and forms, make instant edits, and personalize data displays to suit your specific operational needs—all while unifying data from multiple sources within a single interface.

This solution is ideal for companies that rely on APIs but lack a user-friendly way to manage their data, as well as teams needing flexibility to quickly adapt their internal tools. Magestic’s ease of use, multi-API support, and focus on customization make it a powerful choice for organizations seeking to streamline back-office operations without high development costs. Affiliates can confidently promote Magestic to businesses looking for a fast, affordable, and highly adaptable back-office UI solution.

SocialCards is an intuitive platform designed to help users create professional and eye-catching images for social media posts. With a full-featured image editor, customizable templates, and a unique ability to generate dynamic images and links with previews (Open Graph Images), SocialCards streamlines the process of enhancing social media engagement. Users can easily produce stunning visual content without any technical knowledge, download their creations at any time, and even utilize an API to automate image generation based on templates.

This service is ideal for marketers, social media managers, content creators, and businesses looking to increase their social media presence and clickthrough rates. Affiliates will find SocialCards appealing to a wide range of audiences who want to improve the effectiveness of their social media campaigns, making it an excellent product to promote for those seeking to offer value-added tools that drive online engagement and brand visibility.

Roundproxies offers a comprehensive proxy solution designed for high performance, reliability, and wide global coverage. With access to millions of IPs across residential, datacenter, ISP, and mobile proxies, users benefit from unlimited bandwidth, 99.9% uptime, and seamless connectivity in over 190 countries. The platform provides advanced features such as geo-targeting, automated session management, and support for unlimited concurrent sessions, making it ideal for data collection, web scraping, ad verification, brand protection, and more. Their proxies are praised for speed, consistency, and exceptional customer support, earning high ratings and trust from thousands of businesses worldwide.

This service is particularly valuable for businesses, marketers, developers, and agencies that require reliable, scalable, and unbanned proxies for their operations. Affiliates will find Roundproxies an attractive offer to promote due to its competitive pricing, robust global infrastructure, and proven customer satisfaction, making it a strong choice for clients seeking secure and versatile proxy solutions.

PDF-API.io is an intuitive and powerful PDF generation platform designed to simplify the creation, customization, and automation of professional PDFs. It features a user-friendly drag-and-drop designer as well as an advanced HTML editor, catering to both non-technical users and developers. With dynamic data integration, customizable templates, fillable form fields, and support for images, QR codes, and barcodes, users can create pixel-perfect, branded documents in minutes. The platform also offers robust workflow optimization tools, flexible page management, advanced table controls, and seamless integration through a REST API or no-code tools like Zapier, making it easy to automate document processes across various business systems.

PDF-API.io is ideal for freelancers, small businesses, enterprises, and developers who need efficient and scalable PDF generation for invoices, reports, contracts, and more. Affiliates will find this service attractive to promote due to its wide market appeal, affordable pricing plans, and accessibility for users of all skill levels. Its combination of powerful features, ease of integration, and focus on workflow automation makes it a compelling solution for any business seeking to streamline document management and delivery.