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ToolFit by YourAITools – MCP Server Change Monitor
x402
ToolFit by YourAITools – MCP Server Change Monitor is a paid API for AI agents from api.youraitools.co, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-25).
Registers a public remote MCP server URL for 24-hour periodic re-auditing over 30 days, delivering HMAC-signed webhook notifications whenever the server's tool fingerprint, grade, or reachability changes.
Price / call$0.25
Success—
StatusUnknown
How this service works
MCP server monitoring API (24h checks, 30 days). Register a public remote MCP server URL and an https webhook: ToolFit re-audits the server every 24 hours for 30 days and POSTs an HMAC-SHA256 signed JSON notification when its tools/list fingerprint (pin) or grade changes, or it becomes unreachable or recovers. Returns watch_id, the signing secret (shown once) and the baseline. Unreachable URLs, blocked URLs or webhooks and a full watch list are never charged.
Output
Returns a watch_id, a one-time HMAC-SHA256 signing secret (whsec_ prefix, 64 hex chars), the baseline fingerprint pin, grade letter, numeric score, tool count, an expiry timestamp 30 days out, and a status_url for checking the watch record. Subsequent change events are delivered asynchronously via signed POST to the provided webhook.
Example use cases
MCP server uptime alerting
“Start watching my MCP server at https://mcp.myservice.io/tools every 24 hours and POST a signed notification to https://alerts.myservice.io/webhook if it goes down or comes back up.”
Tool inventory drift detection
“Register https://api.partner.com/mcp for 24-hour ToolFit monitoring and ping my webhook at https://hooks.myplatform.com/mcp-changes whenever the number of tools or the fingerprint pin changes — I need to know if the partner quietly adds or removes tools.”
MCP grade regression tracking
“Set up daily re-auditing for https://mcp.mybusiness.com/hub and deliver signed JSON alerts to https://ops.mybusiness.com/toolfit-hook if the grade or score drops so my team can act before customers are affected.”
Technical details
Endpoint
POSThttps://api.youraitools.co/toolfit/v1/watch?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need continuous, scheduled monitoring of a public remote MCP server and want push-based (webhook) alerts rather than polling it yourself. It is specifically designed for MCP server tool-list fingerprinting and grading, making it more targeted than general HTTP uptime monitors. Prefer it when you care about tool inventory drift, server quality grade changes, or reachability events over a 30-day window with HMAC-verified notifications.
Side effects
- Unreachable MCP server URL at registration time — watch is created but baseline cannot be established
- Webhook URL is not publicly reachable on port 443 — notifications will fail silently; registration still succeeds
- Invalid or non-HTTPS URL provided — request rejected
- Watch expires after 30 days and no further checks are made
- Payment of $0.25 USDC not processed — endpoint returns 402 Payment Required
- Signing secret lost after initial response — cannot be retrieved again
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public remote MCP server URL (Streamable HTTP, https), e.g. https://api.youraitools.co/mcp/hub. ToolFit only lists its tools. |
| every | string | Optional; this route is the 24 h interval (POST /v1/watch/6h for every 6 h). |
| webhook | string | Your https endpoint (public host, port 443) that receives the signed JSON change notifications. A query string is allowed. |
Output
Schema · Response
{
"type": "json",
"example": {
"every": "24h",
"secret": "whsec_<64 hex, shown once>",
"baseline": {
"pin": "ts_0123456789abcdef0123456789abcdef",
"grade": "B",
"score": 85,
"tools": 36
},
"watch_id": "w_0123456789abcdef01234567",
"expires_at": "2026-11-23T17:00:00.000Z",
"status_url": "https://api.youraitools.co/toolfit/v1/watch/w_0123456789abcdef01234567"
}
}Tags
x402
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