The 8 best API affiliate programs in 2025

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.

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.

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.

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.

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.

Hybiscus is an innovative platform designed to simplify the creation of stunning PDF reports for developers and businesses, eliminating the need for design skills or complex CSS. By leveraging a simple JSON API, users can focus purely on content while Hybiscus handles the visual presentation using a library of expertly crafted, pre-designed components. The platform also offers AI-powered report generation, where users can describe their desired report in plain language and let Hybiscus AI convert it into the necessary JSON structure. With built-in data visualization tools, seamless cloud storage integration, a RESTful API, and extensive customization options for layout, colors, and fonts, Hybiscus ensures professional-quality reports are produced quickly and effortlessly.

Ideal for developers, SaaS companies, and teams that frequently generate or automate PDF reporting, Hybiscus streamlines what is typically a time-consuming, design-heavy process. Its ease of use, rapid setup, and modern approach to report generation make it a compelling solution for anyone needing polished PDFs without design expertise. Affiliates will find Hybiscus attractive to promote thanks to its clear value proposition, appeal to a broad range of professionals, and the growing demand for efficient document automation tools.

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.

UptimeBeats is an affordable and comprehensive uptime monitoring solution designed to help businesses keep their websites, servers, and APIs running smoothly around the clock. It offers a range of monitoring features, including HTTP, ping, SSL, and domain expiry checks, with real-time alerts delivered through popular channels such as email, Telegram, Discord, Slack, Teams, and more. Users can monitor from six global regions, track response times with detailed analytics, set up maintenance windows, and create professional status pages to keep their audience informed during outages or maintenance.

Ideal for website owners, developers, IT teams, and agencies, UptimeBeats provides the essential tools needed to ensure uninterrupted online presence and build trust with end users. Its competitive pricing, generous free plan, and attractive lifetime deal make it a compelling choice for those seeking robust monitoring without high costs. Affiliates will find UptimeBeats easy to promote to a wide range of digital businesses looking for reliable uptime monitoring and status page solutions at a fraction of the price of other platforms.