curl --request POST \
  --url https://gateway-api-testnet.circle.com/gateway/v1/x402/verify \
  --header 'Content-Type: application/json' \
  --data '
{
  "paymentPayload": {
    "x402Version": 1,
    "accepted": {
      "scheme": "exact",
      "network": "base-sepolia",
      "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
      "amount": "1000000",
      "payTo": "0x1234567890abcdef1234567890abcdef12345678",
      "maxTimeoutSeconds": 3600,
      "extra": {}
    },
    "payload": {},
    "resource": {
      "url": "<string>",
      "description": "<string>",
      "mimeType": "<string>"
    },
    "extensions": {}
  },
  "paymentRequirements": {
    "scheme": "exact",
    "network": "base-sepolia",
    "asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
    "amount": "1000000",
    "payTo": "0x1234567890abcdef1234567890abcdef12345678",
    "maxTimeoutSeconds": 3600,
    "extra": {}
  }
}
'

{
  "isValid": true,
  "invalidReason": "<string>",
  "payer": "<string>"
}