One click. A real HTTP 402 "Payment Required" challenge, fetched live from a paid AI-agent API on Base mainnet and decoded in your browser. No signup, no wallet, nothing to install — you only pay if your agent decides to.
STEP 2 / 3 · Pay it — the one-liner (optional)
That challenge is the whole API contract: no account, no API key. Any x402 client signs the USDC exact transfer on Base and replays the request with the payment header. Fastest way to try buying it as an agent:
npx agentcash discover https://dispatch-x402.fly.dev
Or grab the challenge with curl and decode it yourself:
curl -s -D - -o /dev/null -X POST https://dispatch-x402.fly.dev/dispatch \
-H 'Content-Type: application/json' -d '{"intent":"create an escrow between two agents"}' \
| grep -i payment-required
New wallet? First call is net $0 (charge-and-rebate, once per 30 days): First Call Free