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mirrored listing x402 eip155:8453

Produce a concrete independently revalidated JSON-Schema/MCP backward-compatibility witnes

Produce a concrete independently revalidated JSON-Schema/MCP backward-compatibility witness before merge/deploy. UNKNOWN or NO_WITNESS_FOUND never means compatible.

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10000 (raw units)
price
2
calls / 30d
1
unique payers
2026-08-28
updated

Provider

witness-contractwitness-production.witness-test.workers.dev · discovered, not yet claimed by its owner

Payment (x402 accepts[])

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xDC9AdC71cEEB973bedC9814272fB457c8c918FFF",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "maxTimeoutSeconds": 300
  }
]

Output schema

{
  "bazaar": {
    "info": {
      "input": {
        "body": {
          "mode": "input_backward_compatibility",
          "new_schema": {
            "type": "string"
          },
          "old_schema": {
            "type": "integer"
          }
        },
        "bodyType": "json",
        "method": "POST",
        "type": "http"
      }
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "input": {
          "additionalProperties": false,
          "properties": {
            "body": {
              "$schema": "https://json-schema.org/draft/2020-12/schema",
              "additionalProperties": false,
              "properties": {
                "mode": {
                  "enum": [
                    "input_backward_compatibility",
                    "output_backward_compatibility"
                  ],
                  "type": "string"
                },
                "new_schema": {
                  "anyOf": [
                    {
                      "type": "boolean"
                    },
                    {
                      "additionalProperties": {},
                      "propertyNames": {
                        "type": "string"
                      },
                      "type": "object"
                    }
                  ]
                },
                "old_schema": {
                  "anyOf": [
                    {
                      "type": "boolean"
                    },
                    {
                      "additionalProperties": {},
                      "propertyNames": {
                        "type": "string"
                      },
                      "type": "object"
                    }
                  ]
                },
                "options": {
                  "additionalProperties": {},
                  "propertyNames": {
                    "type": "string"
                  },
                  "type": "object"
                }
              },
              "required": [
                "mode",
                "old_schema",
                "new_schema"
              ],
              "type": "object"
            },
            "bodyType": {
              "enum": [
                "json",
                "form-data",
                "text"
              ],
              "type": "string"
            },
            "method": {
              "enum": [
                "POST"
              ],
              "type": "string"
            },
            "type": {
              "const": "http",
              "type": "string"
            }
          },
          "required": [
            "type",
            "method",
            "bodyType",
            "body"
          ],
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "payment-identifier": {
    "info": {
      "required": true
    },
    "schema": {
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "properties": {
        "id": {
          "maxLength": 128,
          "minLength": 16,
          "pattern": "^[a-zA-Z0-9_-]+$",
          "type": "string"
        },
        "required": {
          "type": "boolean"
        }
      },
      "required": [
        "required"
      ],
      "type": "object"
    }
  }
}

Use it

curl

curl "https://witness-contractwitness-production.witness-test.workers.dev/v1/contract-witness"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://witness-contractwitness-production.witness-test.workers.dev/v1/contract-witness");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://witness-contractwitness-production.witness-test.workers.dev/v1/contract-witness")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Machine-readable

Everything on this page is also available as clean JSON at /resources/13847.json, and this resource appears in /discovery/resources and /discovery/search.