The 10 best API affiliate programs in 2026

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.

Pricetag is a native Mac application designed specifically for developers who want to manage app, in-app purchase, and subscription pricing efficiently through the App Store Connect API. It streamlines the entire pricing process, allowing users to set region-specific prices based on purchasing power parity, copy existing prices, apply discounts with automated calculations, and utilize custom datasets for consistent pricing strategies. With a user-friendly interface and robust automation, Pricetag eliminates the manual, time-consuming work typically required to adjust prices across multiple territories, making it an essential tool for developers looking to optimize their app revenue.

Pricetag is particularly beneficial for iOS developers, app managers, and businesses overseeing multiple products or targeting international markets. It is ideal for those planning pricing experiments, aiming to maximize revenue outside the US, or operating in countries with fluctuating currencies. Affiliates promoting Pricetag can confidently recommend a highly rated, in-demand solution that saves developers hours of tedious work and helps them increase global earnings, making it a compelling choice for anyone in the app development ecosystem.

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.

FramerAuth is a modern authentication platform designed to help developers and businesses integrate secure and seamless user authentication into their applications. With a focus on simplicity and robust security, FramerAuth provides a comprehensive suite of features including passwordless login, social login integration, multi-factor authentication, and advanced user management tools. The platform is built for flexibility, allowing for quick setup and easy customization to fit the needs of any project, while maintaining compliance with industry security standards.

FramerAuth is an excellent choice for SaaS companies, web developers, startups, and digital businesses looking to streamline their user onboarding process and enhance account security without the hassle of building authentication from scratch. Affiliates will find FramerAuth appealing to promote thanks to its developer-friendly approach, high demand for authentication solutions, and relevance across a wide range of industries and application types.

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.

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.

InvoiceAhoy is a streamlined invoicing solution designed for developers and businesses that need to create, store, and deliver professional invoices directly from any web platform. Featuring an easy-to-use API, pre-built invoice templates, and integration options like Zapier, InvoiceAhoy takes the hassle out of invoice generation. With built-in compliance for global jurisdictions, automatic translation for localized customer communication, and secure encrypted document storage, users can quickly generate and send invoices that look great and meet all regulatory requirements.

This service is ideal for SaaS companies, online marketplaces, freelancers, and any business that needs reliable, automated invoicing integrated into their workflows. Affiliates will find InvoiceAhoy an attractive option to promote due to its developer-friendly approach, flexible pricing plans, and broad appeal for businesses seeking an efficient, compliant, and modern invoicing solution.

InPrivy is a secure platform designed for safely sharing sensitive information such as passwords, API keys, confidential notes, and files online. Unlike traditional methods like email or chat, where private data remains visible and vulnerable, InPrivy provides one-time encrypted links that ensure your information is accessible only to the intended recipient and is automatically voided after use. The platform is GDPR compliant, hosted in Germany with robust AES-256 encryption, and offers additional privacy features like customizable branding, domain options, password protection, team management, API access, and detailed usage notifications—all with a simple, intuitive interface.

InPrivy is an excellent solution for professionals and teams—such as law firms, accountants, IT companies, and agencies—who regularly need to exchange confidential data securely. Affiliates will find InPrivy appealing to promote due to its strong privacy credentials, lifetime pricing with no subscriptions, and broad appeal to businesses prioritizing data protection and compliance. Its ease of use and commitment to privacy make it a valuable tool for anyone needing to share sensitive information online without compromise.

Rendley is a powerful JavaScript video editing SDK that enables developers to build custom video editing applications directly in the browser, eliminating the need for server-side processing. With an intuitive API, Rendley simplifies the complexities of video editing, offering core features such as trimming, splitting, cropping, multi-track compositions, effects, filters, and advanced keyframe animations. The SDK leverages the latest browser technologies for hardware-accelerated, on-device video rendering—even on older mobile devices—while also providing the flexibility to self-host the rendering engine for server-side workflows. Additional highlights include seamless After Effects integration, customizable extensions, flexible storage options, and robust support for captions and project state management.

Rendley is ideal for SaaS companies, startups, e-learning platforms, and any business looking to incorporate video editing capabilities into their products without building from scratch. It appeals to developers seeking a customizable, scalable, and cost-effective solution, with flexible pricing plans and a free tier for development and testing. For affiliates, Rendley presents a compelling opportunity to promote a cutting-edge developer tool that dramatically accelerates video app development, offers strong ongoing support, and addresses a growing demand for in-browser video editing solutions.

Releases is a straightforward changelog software designed to help businesses, developers, and product teams efficiently communicate product updates, new features, and bug fixes to their customers and stakeholders. With a clean, intuitive interface and a powerful editor supporting images, code examples, and an AI assistant, Releases makes it easy to create and publish detailed release notes. Users can customize their changelog to match their brand, utilize custom domains, and notify subscribers through email or an on-page widget. The platform offers features like unlimited entries, team members, subscribers, post scheduling, GitHub sync, API access, regular backups, and a 99.9% uptime guarantee—all for a one-time, affordable payment with no recurring fees.

This tool is ideal for SaaS companies, software developers, IT teams, and any organization seeking a reliable way to keep their user base informed and engaged with ongoing product development. Affiliates will find Releases a compelling product to promote due to its simplicity, transparent pricing, lifetime access, and its value in building user trust through consistent, transparent communication. Its focus on ease of use, brand customization, and strong customer support make it an appealing choice for teams looking to maintain professional and effective changelogs without unnecessary complexity.