AgentAPI

A curated directory of APIs designed for AI agents. Machine-readable. MCP-compatible. Agent-accessible.

Website: https://agentapihub.com
Billing API: https://api.agentapihub.com
Docs: https://api.agentapihub.com/api/docs

x402 Pay-Per-Use Billing

AgentAPI supports x402 — a payment protocol that lets AI agents pay for API calls with USDC on Base. No API keys required.

How It Works

1. Agent calls API endpoint (e.g., /api/gemini/chat/completions)
2. Server returns 402 Payment Required with price + wallet address
3. Agent sends USDC payment on Base chain
4. Agent retries with payment proof in header
5. Server verifies payment, proxies request, returns response