{
 "id": "io.usefulapi/billy",
 "name": "Billy MCP by usefulapi",
 "description": "Read Billy invoices, bills, contacts, products and postings; create contacts and draft invoices.",
 "connect": {
  "transport": "streamable-http",
  "url": "https://billy.usefulapi.io/mcp"
 },
 "website": "https://usefulapi.io/billy/",
 "version": "1.0.0",
 "source": "official MCP registry (registry.modelcontextprotocol.io)",
 "reliability": {
  "verdict": "reliable",
  "attempts": 26,
  "successes": 26,
  "successRate": 1,
  "consecutiveSuccesses": 26,
  "lastStatus": "ok",
  "lastCheckedAt": "2026-10-19T21:45:40.919Z",
  "lastLatencyMs": 4467,
  "toolsAdvertised": 15,
  "method": "MCP initialize + tools/list from Faceabot, identified as FaceabotProbe/1.0 plus, when the server declares a read-only tool (readOnlyHint), one call of that tool with a neutral sample input to check it really returns a result. Servers on the 2026-07-28 MCP revision (no initialize handshake) get the same checks in that revision",
  "work": {
   "verdict": "not_tested",
   "note": "Faceabot has not run a real task on this server yet (it only tests tools that declare themselves read-only)."
  }
 },
 "details": "https://faceabot.com/api/catalog?id=io.usefulapi%2Fbilly",
 "page": "https://faceabot.com/tools/io.usefulapi/billy",
 "badge": {
  "image": "https://faceabot.com/badge/io.usefulapi/billy.svg",
  "markdown": "[![Measured by Faceabot](https://faceabot.com/badge/io.usefulapi/billy.svg)](https://faceabot.com/tools/io.usefulapi/billy)",
  "note": "Live reliability badge the publisher of this server can show on its README or website."
 },
 "recentChecks": [
  {
   "at": "2026-10-19T21:45:40.919Z",
   "ok": 1,
   "status": "ok",
   "ms": 4467,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-19T08:05:42.184Z",
   "ok": 1,
   "status": "ok",
   "ms": 6591,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-18T15:25:44.159Z",
   "ok": 1,
   "status": "ok",
   "ms": 5598,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-18T04:40:41.646Z",
   "ok": 1,
   "status": "ok",
   "ms": 3945,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-17T20:40:42.218Z",
   "ok": 1,
   "status": "ok",
   "ms": 6497,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-17T12:15:43.447Z",
   "ok": 1,
   "status": "ok",
   "ms": 6859,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-17T04:35:47.676Z",
   "ok": 1,
   "status": "ok",
   "ms": 9170,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-16T20:55:44.690Z",
   "ok": 1,
   "status": "ok",
   "ms": 5050,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-16T13:46:03.074Z",
   "ok": 1,
   "status": "ok",
   "ms": 5641,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-16T06:45:51.243Z",
   "ok": 1,
   "status": "ok",
   "ms": 5497,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-15T23:50:51.182Z",
   "ok": 1,
   "status": "ok",
   "ms": 4188,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-15T16:51:30.471Z",
   "ok": 1,
   "status": "ok",
   "ms": 6589,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-15T10:11:02.460Z",
   "ok": 1,
   "status": "ok",
   "ms": 4728,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-15T03:40:29.210Z",
   "ok": 1,
   "status": "ok",
   "ms": 3252,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-14T21:15:15.949Z",
   "ok": 1,
   "status": "ok",
   "ms": 4835,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-14T14:45:35.400Z",
   "ok": 1,
   "status": "ok",
   "ms": 4151,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-14T08:20:32.292Z",
   "ok": 1,
   "status": "ok",
   "ms": 2057,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-14T01:31:27.585Z",
   "ok": 1,
   "status": "ok",
   "ms": 6009,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-13T19:20:55.872Z",
   "ok": 1,
   "status": "ok",
   "ms": 9179,
   "f_status": "auth_required"
  },
  {
   "at": "2026-10-13T13:15:59.107Z",
   "ok": 1,
   "status": "ok",
   "ms": 7441,
   "f_status": "auth_required"
  }
 ],
 "trust": {
  "access": "no sign-in needed",
  "tools": 15,
  "declaredReadOnly": 13,
  "declaredCanWrite": 2,
  "declaredDestructive": 2,
  "toolDefinitionsFingerprint": "cfbc5aa1031b079a5d48294dd560e277",
  "toolDefinitionsLastChangedAt": null,
  "toolDefinitionChangesSinceFirstSeen": 0,
  "firstSeenAt": "2026-10-17T20:40:42.385Z",
  "protocol": "2025-06-18",
  "warnings": [],
  "note": "Facts observed by Faceabot when it last read this server's tool list. 'Can write' counts tools not declared read-only (annotations are self-declared). A changed fingerprint means tool names, descriptions or schemas changed since Faceabot first saw them: re-check before trusting an earlier approval."
 }
}