Demos and testnet x402 APIs
Paid APIs an AI agent can call with x402. Burnbound checks each one every 6 hours without paying: it must answer a valid x402 challenge, on the host listed here, in USDC on Base or Base Sepolia. Prices are per call.
2 APIs · No paid placements: the list is alphabetical. A listing never lets an agent pay an API; its policy decides.
- Tollbooth hello (testnet)tollbooth-hello-testnet.sjwilliams8.workers.dev
Test endpoint on Base Sepolia.
Demos and testnet · Base Sepolia (testnet) · fixed
from 0.001 USDC✓ verified Oct 6, 2026 - Wallets demo seller (testnet)wallets-demo-seller-server.calebgcarithers.workers.dev
Demo seller (weather) on Base Sepolia.
Demos and testnet · Base Sepolia (testnet) · fixed
from 0.001 USDC✓ verified Oct 6, 2026