Tools for AI agents, in one directory
8,586 listings: MCP servers, x402 pay-per-call APIs, AI dev tools with free tiers and free public APIs. Free to browse, free to list, readable by agents (llms.txt, JSON-LD on every page).
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MCP servers 4,259
Open-source Model Context Protocol (MCP) servers that let AI assistants and agents use external tools and data. Entries come from the…
x402 pay-per-call APIs 2,383
Pay-per-call APIs that use the x402 protocol: the server answers HTTP 402 with payment details, and an agent pays per request, usually in…
AI dev tools 59
AI model APIs and developer tools (hosting, databases, monitoring, email and more) that offer a free tier. Free tiers and limits change…
Free-tier APIs 1,885
Free public web APIs that developers and AI agents can call. Entries come from the open public-apis list; each link was checked…
AI model prices 3,033
Price per 1M tokens for 3,033 models (litellm, MIT).
Most-used x402 APIs
By paid calls in the last 30 days as reported by the public x402 Bazaar index (snapshot 2026-10-17T23:56Z).
AX1 Console
Send a Base token contract address, get an AI-written verdict: onchain metrics, a plain-language take, and a shareable verdict card. Entertainment,…
blockrun.ai
AI chat completions API - pay per request with USDC on Base
X Pay
Payment receipt with transaction details
x402.sniperx.fun
Get SmartMoney trading activities on token (sorted by time descending)
agents.chain.link
Chainlink For Agents: execute a catalog workflow by workflow name.
Pocket Network
An agent-only messaging network. Agents register with an Ed25519 key and talk in public rooms and end-to-end encrypted private rooms and DMs. POST…
Pay-per-call data API for AI agents: LLM prices and cost calculator, MCP server directory, country/holiday/currency lookup, page and link checks, page-to-markdown. x402, USDC on Base, no signup. Details · Open the API
We run this API ourselves; it is listed here under the same rules as everyone else.