Auto-detect a public MCP endpoint era, fingerprint its complete normalized tools
Auto-detect a public MCP endpoint era, fingerprint its complete normalized tools/list schema contract and optionally compare it with a caller-provided previous SHA-256 hash. Cosmetic descriptions are excluded so text-only edits do not trigger contract drift. Base mainnet USDC
Answeringour last check, 2026-10-10
1 of 1checks answered this week
912 msmedian answer time
$0.004listed price per call
$0.004price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/mcp/changed
| Category | Code and developer |
|---|---|
| Provider host | http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-10 | valid payment request | 402 | $0.004 | 912 ms |
Example input (from the provider)
{
"body": {
"previous_hash": "0000000000000000000000000000000000000000000000000000000000000000",
"url": "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/fixtures/mcp"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"previous_hash": {
"description": "Earlier result hash used to detect a material change.",
"pattern": "^[a-fA-F0-9]{64}$",
"type": [
"string",
"null"
]
},
"protocol_version": {
"description": "Public protocol version value used to scope this lookup.",
"maxLength": 32,
"minLength": 1,
"type": "string"
},
"url": {
"description": "Public HTTP(S) URL to inspect, resolve, or compare.",
"maxLength": 2048,
"minLength": 1,
"pattern": "^https?://",
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"capability": {
"const": "mcp.changed",
"description": "Public capability value used to scope this lookup."
},
"data": {
"additionalProperties": false,
"description": "Public data value used to scope this lookup.",
"properties": {
"auth_required": {
"description": "Public auth required value used to scope this lookup.",
"type": "boolean"
},
"changed": {
"description": "Public changed value used to scope this lookup.",
"type": [
"boolean",
"null"
]
},
"new_hash": {
"description": "Earlier result hash used to detect a material change.",
"pattern": "^[a-fA-F0-9]{64}$",
"type": [
"string",
"null"
]
},
"previous_hash": {
"description": "Earlier result hash used to detect a material change.",
"pattern": "^[a-fA-F0-9]{64}$",
"type": [
"string",
"null"
]
},
"protocol_era": {
"description": "Public protocol era value used to scope this lookup.",
"enum": [
"modern",
"legacy",
null
],
"type": [
"string",
"null"
]
},
"protocol_version": {
"description": "Public protocol version value used to scope this lookup.",
"type": [
"string",
"null"
]
},
"reachable": {
"description": "Public reachable value used to scope this lookup.",
"type": "boolean"
},
"schema_valid": {
"description": "Public schema valid value used to scope this lookup.",
"type": [
"boolean",
"null"
]
},
"scope": {
"const": "mcp_tools_schema_contract_change_only",
"description": "Public scope value used to scope this lookup."
},
"tool_count": {
"description": "Public tool count value used to scope this lookup.",
"minimum": 0,
"type": [
"integer",
"null"
]
},
"transport": {
"description": "Public transport value used to scope this lookup.",
"enum": [
"http-jsonrpc",
"sse"
]
},
"url": {
"description": "Public HTTP(S) URL to inspect, resolve, or compare.",
"type": "string"
},
"warnings": {
"description": "Public warnings value used to scope this lookup.",
"items": {
"type": "string"
},
"type": "array"
}
},
"required": [
"url",
"changed",
"previous_hash",
"new_hash",
"reachable",
"auth_required",
"protocol_era",
"protocol_version",
"transport",
"tool_count",
"schema_valid",
"warnings",
"scope"
],
"type": "object"
},
"meta": {
"additionalProperties": false,
"description": "Public meta value used to scope this lookup.",
"properties": {
"cache": {
"description": "Public cache value used