API service
37 free API service tools, ranked by recommendation. How to use each free and whether signup is needed is on its detail page; always follow the official site.
Free only · 37 tools
xAI API
API for Grok series foundational models available for developers.
SunoAI API
An open-source project, implementing an API interface for AI music services
API.box
Seamlessly integrate advanced AI interfaces to empower your projects.
Lemonfox.ai Text-to-Speech API
A low-cost, high-quality text-to-speech API supporting multiple languages and accents, easy to integrate.
HumanLayer
API and SDK for human-in-the-loop feedback, inputs, and approval for AI agents.
Gologin Cloud Browser
Cloud browser infrastructure for AI teams and automation, which can be launched via applications or APIs, with a 7-day free trial.
Agnes AI
Agnes AI is an AI gateway and free API platform that offers multimodal AI models and applications.
Steamship
Build and deploy Prompt APIs in seconds.
OrcaRouter
OrcaRouter can route prompts across more than 200 models such as OpenAI, Anthropic, and Gemini. It offers high - quality services at an affordable price without any mark - up.
APIMaster
One-stop solution for Claude relay, OpenAI top-up, and ChatGPT API purchase, saving costs and verifying authenticity.
UnifAPI MCP
Unif API provides public data skills, MCP servers, and real-time public data APIs for AI agents.
APIARC AI
APIArc provides developers with a unified API key and endpoint to access AI models from multiple vendors.
Postproxy
Unified social media API, which enables cross - platform posting, comment management, private message handling, and comment interaction.
Jev AI – AI Decision
TranscriptFetch
Video and podcast transcription API, supporting multiple platforms, built for AI, including batch extraction function.