Artificial intelligence APIs let you add machine learning capabilities to your applications without building models from scratch. From natural language processing to image recognition, these APIs handle the heavy lifting so you can focus on your product.
Last verified: November 12, 2026
| Name | Description | Auth | HTTPS | CORS | Uptime (30 days) |
|---|---|---|---|---|---|
| AI/ML | Access 100+ curated AI Models over 1 API | apikey | Yes | yes | 100% (5 checks) |
| API Route | OpenAI-compatible multi-model gateway for chat completions with API keys and usage-based billing | apikey | Yes | yes | 100% (5 checks) |
| APIClaw | Flat-rate OpenAI-compatible gateway for Claude, GPT, DeepSeek, Qwen, Kimi and GLM models | apikey | Yes | yes | 100% (5 checks) |
| APIModels | OpenAI-compatible API for 150+ image, video, audio and LLM models: automatic channel failover, failed calls not billed, most prices below official rates | apikey | Yes | yes | 100% (5 checks) |
| AtmoRouter | OpenAI- and Anthropic-compatible LLM API: one key for chat completions, streaming and tools, billed per token from a prepaid balance | apikey | Yes | no | 100% (1 check) |
| Audo | Noise removal, speech restoration, transcription and audio/video editing with a recurring free tier | none | Yes | no | unknown |
| Cheaper Inference | OpenAI-compatible LLM gateway: one API key for chat models from several labs, plus an Anthropic-compatible Messages endpoint | apikey | Yes | no | 100% (5 checks) |
| cogDepot | Marketplace API for AI agents to post service listings, negotiate terms, and finalize deals, with an A2A Agent Card and JSON-RPC endpoint | apikey | Yes | no | 100% (5 checks) |
| CustomGPT.ai | RAG API with RESTful endpoints, comprehensive SDKs, and enterprise-grade reliability. | apikey | Yes | yes | 100% (5 checks) |
| Face-api.js | JavaScript API for face detection, recognition, and emotion analysis using TensorFlow.js | none | Yes | unknown | 100% (5 checks) |
| Gandr | Text to speech API for voice agents. One voice in 23 languages, every render watermarked | apikey | Yes | yes | 100% (5 checks) |
| Gladia | Artificial intelligence API's | apikey | Yes | no | 100% (5 checks) |
| HarnessRouter | Run coding agent harnesses (Codex, Claude Code, Hermes) behind your product through one API | apikey | Yes | unknown | 100% (5 checks) |
| HOL Registry Broker | Discovery API for AI agents & MCP servers (search, verify, UAID, chat) | apikey | Yes | yes | 100% (5 checks) |
| HopBase | Text, image and video models such as Claude, GPT, Gemini, DeepSeek and Qwen through one OpenAI-, Anthropic- and Gemini-compatible API | apikey | Yes | yes | 100% (1 check) |
| Imagera | One API key for 328 image, video and audio models plus 320+ language models on an OpenAI-compatible endpoint, paid from a prepaid balance | apikey | Yes | yes | 100% (2 checks) |
| ISMS Copilot | OpenAI-compatible text-only compliance completions: curated framework knowledge (100+ modules) injected before generation and disclosed on success | apikey | Yes | no | 100% (5 checks) |
| Keenable | Web search and page fetch API for AI agents, backed by an independent web index | apikey | Yes | unknown | 100% (4 checks) |
| Magic Hour | Generate and edit AI videos, images, and audio through a self-serve REST API | apikey | Yes | yes | 100% (5 checks) |
| Neuronto | Free search over MCP servers, A2A agents, skills and APIs across Agentic Resource Discovery registries | none | Yes | yes | 100% (5 checks) |
| nRouter | LLM gateway API — one OpenAI-compatible API key for every model, with smart routing, automatic fallbacks, per-key budgets and guardrails. | apikey | Yes | unknown | unknown |
| Obscurify AI | Anonymous OpenAI-compatible API for 200+ LLMs. Accounts are a random number, no email; pay with Monero, Bitcoin or card | apikey | Yes | yes | 100% (5 checks) |
| OpenAI | Use AI models such as ChatGPT or DALL-E to experience the capabilities of AI | apikey | Yes | yes | 100% (5 checks) |
| Pictograph | Label images with SAM3, train RF-DETR and YOLOX detectors, and run them on GPU endpoints that take live RTSP and WebRTC video | apikey | Yes | no | 100% (5 checks) |
| Prismix Status API | Real-time uptime and incident status for 75+ AI services (OpenAI, Anthropic, Cursor, Gemini) | none | Yes | yes | 100% (5 checks) |
| RouterBase API | One OpenAI-compatible API for accessing 200+ AI models from OpenAI, Anthropic, Google, Meta, xAI, DeepSeek, and more | apikey | Yes | unknown | 100% (5 checks) |
| Summarize Text with AI | This API generates customizable summaries of text and web pages using AI | apikey | Yes | yes | 100% (5 checks) |
| Synap | OpenAI-compatible API for open-weight models: chat completions, streaming, tool calling and JSON-schema output, billed per token | apikey | Yes | no | 100% (5 checks) |
| TranscriptFetch | The transcript API for social media video. Get transcripts at scale from YouTube, TikTok or Instagram. | apikey | Yes | yes | 100% (5 checks) |
| UberLLM | OpenAI- and Anthropic-compatible API for GPT, Claude, Gemini, DeepSeek and uncensored models plus image, video and music, billed at provider cost | apikey | Yes | yes | 100% (4 checks) |
| WaveSpeedAI | Generate images, video and audio from 900+ open and commercial models (FLUX, Seedream, Kling, Wan) through one async REST API | apikey | Yes | yes | 100% (5 checks) |
| XiuRouter | Route requests to leading AI models through one API with native OpenAI, Anthropic, and Gemini protocols | apikey | Yes | yes | 100% (5 checks) |
4 of these APIs require no authentication — you can start making requests immediately without signing up for an account. Just pick one from the table above, check its documentation, and send your first request.
28 APIs in this category require a free API key. This usually means creating a free account on the provider's website and copying your key from the dashboard. The process typically takes less than a minute.
Not sure where to start? Check the uptime column: it shows how often each API's documentation responded to our daily checks over the last 30 days, and the dot shows whether it responded at the latest check. For browser-based projects, check that the API supports CORS.
Yes, all APIs listed on API Bouncer have a free tier. Some are completely open (no sign-up needed), while others require a free account to get an API key. Free tiers typically have rate limits — check each API's documentation for specifics.
It depends on your needs. Consider: Do you need authentication or prefer no-auth? Does your project need CORS support for browser access? How many requests will you make? Start with a no-auth API to prototype quickly, then switch to a more feature-rich option if needed.
We run periodic health checks on all listed APIs. The "Status" column shows whether each API was responding at our last check. APIs marked as "alive" were recently verified. You can also test any API yourself using curl or our guides on testing APIs.
Most free APIs allow commercial use, but terms vary by provider. Always check the specific API's terms of service. Some APIs have separate free and commercial tiers with different rate limits.
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