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autobus MCP Registry Drift Detector
x402
autobus MCP Registry Drift Detector is a paid API for AI agents from witness.holoweave.org, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).
Compares a live MCP server's current tool surface against its registry entry and returns a signed attestation indicating whether they match
Price / call$0.01
Success—
StatusDown
How this service works
Web bot auth debugging for AI agents, priced per check at $0.01. RFC 7638 keyid thumbprint verification, RFC 9421 Ed25519 signature verification, and per-verifier acceptance rules. Signed attestations, published fixtures, sources with dates.
Output
A JSON object containing a signed Ed25519 attestation with: a verdict (pass/fail), live server info (reachability, tool count, server name and version, surface digest, protocol version), registry metadata (status, version, remote URL, remote type), and a comparison result indicating whether the tool surface is unchanged and the version matches. The signature includes algorithm, base64 value, and key ID.
Example use cases
Detecting unauthorized tool changes
“Has anything changed in the io.github.example/weather MCP server compared to what the registry says? I want a signed attestation so I can prove the tool surface is still the same as last week.”
Baseline drift monitoring after deployment
“I deployed a new version of io.github.myorg/datatools — can you compare the live server to the registry and confirm the tool count and version both match, and give me the surface digest for my records?”
Verifying registry consistency before agent handoff
“Before I hand off to a third-party MCP server io.github.vendor/payments version 1.4.2, can you check whether it matches what the registry has on record and flag any drift?”
Technical details
Endpoint
POSThttps://witness.holoweave.org/v1/mcp-registry-driftWhen to prefer
Use this endpoint when you need cryptographically signed, independently attested proof that an MCP server's tool surface matches its registry entry — especially before trusting a third-party MCP server, after a deployment, or as part of a continuous integrity monitoring workflow. Prefer this over manual inspection or unauthenticated checks when auditability and non-repudiation matter.
Side effects
- Server unreachable — live.reachable returns false, verdict may be fail
- Registry entry not found — server name or namespace incorrect
- Version mismatch — specified version does not exist in registry
- Digest mismatch — expect_digest provided but surface has changed, returns CHANGED
- Invalid tools array — malformed tools input causes schema validation error
- Payment failure — x402 payment not accepted, returns 402 before processing
Output
Schema · Response
{
"example": {
"signature": {
"alg": "ed25519",
"value": "base64...",
"key_id": "aw-attest-2026-08"
},
"attestation": {
"verdict": "pass",
"endpoint": "mcp-registry-drift",
"evidence": {
"live": {
"reachable": true,
"tool_count": 8,
"server_info": {
"name": "autobus",
"version": "0.2.0"
},
"surface_digest": "b41c…",
"protocol_version": "2025-06-18"
},
"registry": {
"name": "io.github.ninefiveonefive/autobus",
"status": "active",
"version": "0.2.0",
"remote_url": "https://witness.holoweave.org/mcp",
"remote_type": "streamable-http"
},
"comparison": {
"unchanged": true,
"version_matches": true
}
}
}
}
}Tags
x402
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