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A single API call returns live, cryptographically signed data across 87 sources so AI agents and software can verify what they're consuming — a developer-facing trust layer, not a consumer app.
No sign-upOpen source
What to know▼
How it works
A single keyless API call returns structured JSON for 87 live tools across 19 verticals; each datapoint carries its source, licence, timestamp and an Ed25519 signature, optionally Bitcoin-anchored.
What's different
Data is cryptographically verifiable rather than just scraped and cited, and it works without signup or an API key via an MCP endpoint or batch POST.
Best for
Developers building AI agents or software that need to independently verify the live data they consume.
We check every product on this page once a day and record whether it still answers.
A free academic-paper search API over 236M papers with an MCP endpoint, built so AI agents like Claude Code can do literature research without hitting rate limits.
FreeNo sign-up
What to know▼
How it works
A hybrid search engine over the Semantic Scholar corpus — 236M papers in the keyword index, 146M with dense vectors — fused with RRF and reranked by a cross-encoder, with a plain JSON API and a native MCP endpoint.
What's different
Built specifically so AI agents like Claude Code can run literature research without hitting the rate limits that other academic APIs impose.
Pricing
Free web search with no signup.
Best for
AI agents and developers doing deep academic literature research.
We check every product on this page once a day and record whether it still answers.
An open-source Chrome extension that lets an AI agent read and act on the page you're viewing, using whatever model you plug in, with API keys kept local and no telemetry.
No sign-upOpen sourceNo tracking
What to know▼
How it works
An open-source Chrome extension where an AI agent reads and acts on the page you're viewing, using any model you plug in — OpenRouter, OpenAI, Claude, Gemini, Groq, or a local model.
What's different
Model-agnostic and keeps API keys local in the browser rather than sending them through a vendor's servers.
Pricing
MIT license, no account required.
Best for
Developers who want a browser agent they can point at any LLM provider, including local models, without vendor lock-in.
