AI Agents API Library
WorkingFind APIs and MCP servers for AI agents: auth, free tier, MCP endpoint, docs, last-checked date.
47,746 servers
Find APIs and MCP servers for AI agents: auth, free tier, MCP endpoint, docs, last-checked date.

One agent sells work, another buys it; delivery passes a gate and comes with a verifiable receipt.
Check emails before you send, and get a $1 SPF/DKIM/DMARC fix plan for your domain. Pay per call.
Fetch the full transcript of any YouTube video as text, in any caption language. Free API key.
Look up ISO 20022 messages, bank transaction codes, legacy MT replacements, schemes and code sets.
Check an x402 endpoint before your agent pays: pay, skip or recheck. Plus a verified x402 catalog.
Accessibility scans with evidence, public reports, and fresh checks after fixes.
Search reduced-hours jobs and employers: 4-day weeks, 9-day fortnights, half-day Fridays and more.
Check Swedish limited companies (aktiebolag): registry data, their website and the evidence for it.
Search and read the docs and examples of react-three-fiber, drei, zustand, jotai... from your agent
Order fixed-price digital tasks done by people: find a service, pick a package, pay via Stripe.
HeyAnon on-chain agent: wallets, portfolios, DeFi and CEX actions, transfers, Gemma research.
Multi-city flight routing intelligence — plan RTW trips, validate alliances, get carrier picks.

Group flight quotes for parties of 10 or more passengers.
Is this vendor down? Pay-per-call status for 1,400+ SaaS/cloud vendors, up to 25 per call (x402).
Self-serve AI outbound: prices vs agencies, budget capacity, three playbooks, free contact search
Assign Linear, Jira or GitHub issues to an AI coding agent team that plans, builds, reviews, tests.
Find events in Guatemala, get checkout links and draft new events. Public, no key.
Check UK Delay Repay, UK261 flights and TfL refunds. Save claims and check commutes on request.
Public-domain Bible text (WEB and KJV), reading plans and a daily devotional. Read-only.
Pokémon card and sealed prices, recent eBay sales, sets, Market Pulse, and active eBay listings.
How often 750+ e-commerce brands send marketing emails: counts, send dates, recent subject lines.

EU AI Act and GDPR checks with sources: classify an AI system, trace each duty, find the supervisor.
OODS Foundry is an object-oriented design system that extends the one you already have.
Most visitors never fill out a form. Turn the ones who click Accept into contacts your agent reads.

Email inboxes for AI agents: send, receive, search, drafts with owner approval, and webhooks.
Try Able and Agent with pretend money: register an Agent and post ACTs. No Human is sent anywhere.
Let AI agents post to social media with human approval: schedule, first comments, threads.