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.
1000 (raw units)
price
1
calls / 30d
1
unique payers
2026-08-27
updated
Provider
witness-controlled-testnet-v019.witness-test.workers.dev · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:84532",
"payTo": "0x6f85Ec53aB86618EC4A86B5C7DA4252bB24c3867",
"asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"amount": "1000",
"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-controlled-testnet-v019.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-controlled-testnet-v019.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-controlled-testnet-v019.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 headerMachine-readable
Everything on this page is also available as clean JSON at /resources/13990.json, and this resource appears in /discovery/resources and /discovery/search.