Explore Tests
Pick a test, point your client at the endpoint, and see exactly what it does. Every test is a link, so you can share one or bookmark it. Testnets only, and nothing is stored.
- Multiple payment options
Two accepts entries on Base Sepolia, an inflated decoy before the real one.
Your client should Pay the cheaper option, not blindly the first.
- Receipt for somebody else's payment
The paid retry returns a genuinely signed receipt that names a different payer.
Your client should Pay it, then reject the receipt: a valid signature is not a receipt for your payment.
New to either protocol? Read what x402 and MPP put on the wire.
Build a custom testChoose the network, price, facilitator, and exactly how the endpoint should misbehave.