Index onlineMerchant portal
Api Endpoint

Agent Mercantile

Determine whether a previously accepted x402 service payment contract is still equivalent enough to proceed. Compares one live unpaid 402 challenge, using a caller-supplied GET or POST request shape, against a caller-held baseline bound to that request identity. Not uptime monitoring, a trust score, a webhook, a marketplace crawl, or a generic POST {} probe of every x402 resource.

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Offering

Provider
api.agentmercantile.com
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Security
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://api.agentmercantile.com/v1/x402-service-change-snapshot
MIME type
Not provided
First seen
2026-10-16T01:50:45.949Z
Last seen
Tags
x402-service-change, payment-contract-change, buyer-requalification, direct-vs-discovery, x402-baseline

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0xdb7b2b54f80479826222749a2ea73a8acc306e1e"
  }
]

Observed health

Status
Healthy
Latest latency
105 ms
Average latency
314 ms
HTTP status
200
Last checked
Reachability
100% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "additionalProperties": false,
  "properties": {
    "body": {
      "additionalProperties": false,
      "properties": {
        "baseline": {
          "description": "Optional caller-held reusable payment-contract baseline bound to this request identity.",
          "type": "object"
        },
        "body": {
          "description": "Optional JSON object for POST probes only.",
          "type": "object"
        },
        "method": {
          "description": "Required unpaid 402 probe method. Not inferred from discovery.",
          "enum": [
            "GET",
            "POST"
          ],
          "type": "string"
        },
        "resource_url": {
          "description": "One public HTTPS x402 resource URL on port 443.",
          "format": "uri",
          "type": "string"
        }
      },
      "required": [
        "resource_url",
        "method"
      ],
      "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"
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "additionalProperties": false,
          "properties": {
            "baseline": {
              "description": "Optional caller-held reusable payment-contract baseline bound to this request identity.",
              "type": "object"
            },
            "body": {
              "description": "Optional JSON object for POST probes only.",
              "type": "object"
            },
            "method": {
              "description": "Required unpaid 402 probe method. Not inferred from discovery.",
              "enum": [
                "GET",
                "POST"
              ],
              "type": "string"
            },
            "resource_url": {
              "description": "One public HTTPS x402 resource URL on port 443.",
              "format": "uri",
              "type": "string"
            }
          },
          "required": [
            "resource_url",
            "method"
          ],
          "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"
    },
    "output": {
      "properties": {
        "example": {
          "additionalProperties": true,
          "properties": {
            "decision": {
              "enum": [
                "BASELINE_CREATED",
                "CONTINUE",
                "REVIEW",
                "STOP",
                "UNKNOWN"
              ],
              "type": "string"
            },
            "limitations": {
              "items": {
                "type": "string"
              },
              "type": "array"
            },
            "machine": {
              "enum": [
                "VM08"
              ],
              "type": "string"
            },
            "methodology_version": {
              "enum": [
                "x402-service-change-snapshot-0.1.0"
              ],
              "type": "string"
            },
            "status": {
              "enum": [
                "OK",
                "PARTIAL",
                "HOLD"
              ],
              "type": "string"
            }
          },
          "required": [
            "status",
            "machine",
            "methodology_version",
            "decision",
            "limitations"
          ],
          "type": "object"
        },
        "type": {
          "type": "string"
        }
      },
      "required": [
        "type"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}