Compliant x402 endpoint

A compliant x402 endpoint charging 0.0001 USDC on Base Sepolia, advertising x402.org.

Pick a protocol

x402 uses its own PAYMENT-REQUIRED header. MPP uses the standard HTTP auth framework.

x402Coinbase. PAYMENT-REQUIRED and PAYMENT-SIGNATURE headers.MPPTempo and Stripe. WWW-Authenticate: Payment. Not served yet.

Pick a network

Testnets only. Nothing here can move real money.

Network

Asset

USDC, 6 decimals

Set the price

Amounts are atomic units of the asset, so no decimal point.

Amount

= 0.0001 USDC

Scheme

Recipient

Defaults to this network's burn address.

Pick a facilitator

What the challenge advertises for verify and settle. test402 issues challenges; it never settles.

Facilitator

Public testnet facilitator from the x402 docs.

Choose a behavior

Compliant by default. Every deviation is named, and never on by accident.

Behavior

A well-formed challenge. Your client should pay it.

Your endpointcompliant

/api/x402

Try it

curl -i "https://test402.com/api/x402"

Returns 402 with a spec-compliant challenge.

Response it will return (HTTP 402)

{
  "x402Version": 2,
  "error": "PAYMENT-SIGNATURE header is required",
  "resource": {
    "url": "https://test402.com/api/x402",
    "description": "test402 challenge",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:84532",
      "amount": "100",
      "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
      "payTo": "0x0000000000000000000000000000000000000402",
      "maxTimeoutSeconds": 300,
      "extra": {
        "name": "USDC",
        "version": "2",
        "assetTransferMethod": "eip3009"
      }
    }
  ],
  "extensions": {
    "https://test402.com/extensions/facilitator": {
      "id": "x402org",
      "url": "https://x402.org/facilitator"
    }
  },
  "note": "test402 scenario. quirk=none"
}