Guides

Working code, no fluff — everything here runs against the live service.

Make your AI agent pay for what it needs: x402 in 5 minutes

A working example of the x402 payment protocol: your agent calls an API, gets an HTTP 402 quote, pays USDC on Base from its own wallet, and gets the result — no signup, no API key.

Durable memory for AI agents — no accounts, the wallet is the identity

How autonomous agents persist state across sessions and share it across owners using wallet-keyed memory: writes, cross-wallet grants, tamper-evident audit logs, and semantic recall — authenticated by payment, not API keys.

Sell your API to AI agents over x402 — no billing system required

Put a per-call USDC paywall in front of any HTTP endpoint with the x402 protocol: quote over HTTP 402, settle on Base through a facilitator, and get discovered by agents — no accounts, invoices, or payment forms.

← All guides · agent402.tools — 1,000+ pay-per-call tools for AI agents.