x402.tokenizen.nl

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "error": "PAYMENT-SIGNATURE header is required",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x015Eb036560216B3051339061FF68A207E0fe88f",
      "amount": "5000",
      "scheme": "exact",
      "network": "eip155:8453",
      "maxAmountRequired": "5000",
      "maxTimeoutSeconds": 300
    }
  ],
  "resource": {
    "url": "https://x402.tokenizen.nl/api/vuln-search",
    "mimeType": "application/json",
    "description": "tokenizen vulnerability pattern search, 1032 exact-reconciled findings from 10 Sherlock contests"
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "q": "oracle price manipulation"
          }
        },
        "output": {
          "type": "json",
          "example": {
            "note": "acceptance_rate is the historical share of findings of this pattern that were accepted on Sherlock. It is a record of past outcomes, not a prediction for a new submission.",
            "query": "oracle price manipulation",
            "source": "tokenizen-knowledge-base",
            "results": [
              {
                "pattern": "oracle-manipulation",
                "accepted": 55,
                "sherlock_rate": 0.53,
                "total_findings": 109,
                "acceptance_rate": 0.5,
                "examples_accepted": [
                  "title of an accepted finding, as returned by the live endpoint"
                ],
                "examples_rejected": [
                  "title of a rejected finding, as returned by the live endpoint"
                ]
              }
            ],
            "contests": 10,
            "platforms": "Sherlock + Code4rena",
            "total_findings": 1032
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "body": {
                "type": "object"
              },
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "POST"
                ],
                "type": "string"
              },
              "bodyType": {
                "type": "string"
              },
              "queryParams": {
                "type": "object",
                "properties": {},
                "additionalProperties": {
                  "type": "string"
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type",
              "example"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "piprail": {
      "pay": [
        {
          "how": "Sign an EIP-3009 transferWithAuthorization for this amount to payTo and resubmit with the PAYMENT-SIGNATURE header. Any x402 client that speaks the exact scheme works.",
          "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
          "payTo": "0x015Eb036560216B3051339061FF68A207E0fe88f",
          "amount": "5000",
          "scheme": "exact",
          "symbol": "USDC",
          "network": "eip155:8453",
          "amountFormatted": "0.005"
        }
      ],
      "docs": {
        "pay": "https://x402.org",
        "home": "https://tokenizen.nl",
        "agents": "https://github.com/holistis/agent-receipt-verify"
      },
      "name": "tokenizen vulnerability pattern search",
      "what": "This is an x402 \"402 Payment Required\" endpoint. Pay one of the offered rails to access it.",
      "client": {
        "note": "No proprietary client is required. Any x402 client that implements the exact scheme on eip155:8453 can pay this endpoint."
      },
      "verify": {
        "note": "The receipt this endpoint returns can be checked independently, without trusting us.",
        "tool": "npx -y agent-receipt-verify",
        "source": "https://github.com/holistis/agent-receipt-verify"
      },
      "version": "2",
      "protocol": "x402",
      "instruction": "tokenizen x402 payment endpoint. Pay 0.005 USDC on eip155:8453 to 0x015Eb036560216B3051339061FF68A207E0fe88f with an EIP-3009 signature in the PAYMENT-SIGNATURE header. The receipt you get back can be verified independently with npx -y agent-receipt-verify. Docs: https://tokenizen.nl."
    }
  },
  "x402Version": 2
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x015Eb036560216B3051339061FF68A207E0fe88f",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://x402.tokenizen.nl/api/vuln-search",
    "description": "",
    "maxAmountRequired": "5000",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog

2026-10-18 14:53Z

Last indexed by Roundhouse

2026-10-18 16:15Z

Last enriched (probe, favicon, geo)

2026-10-18 16:45Z

x402 version

1

Max timeout

300s

Liveness probe

HTTP 402