# TruthBear MCP Ecosystem Census

> TruthBear MCP Ecosystem Census is a paid API for AI agents from api.truthbear.co, paid per call via x402, $0.09/call, status unknown (last checked 2026-09-13).

Returns a full batch snapshot of 21,236+ MCP servers with status, lifecycle state, missing streak, and record hash for the latest day.

## Facts

- Endpoint: GET https://api.truthbear.co/mcp/census
- Price: $0.09/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/truthbear-mcp-ecosystem-census-75433a1b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UTqC190IWewEP8zJvFKgz

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability truthbear-mcp-ecosystem-census-75433a1b
```

Example prompt: Pull me the full TruthBear MCP ecosystem census for today — all 21,000+ servers with their status, lifecycle, and missing streaks — and include the verifiable hash pre-images so I can audit the data offline.

## When to prefer this

Choose this endpoint when you need a comprehensive, auditable bulk snapshot of the entire MCP server ecosystem in a single call. It is the right choice for compliance audits, ecosystem health monitoring, offline verification workflows (using verifiable=1), or building derived datasets that track server churn and lifecycle changes. Prefer this over per-entity endpoints when you need the full population rather than a single server's history or chain analysis.

## Known failure modes

- 422 no_charge: no data available for the requested snapshot — not billed
- Degraded delivery: prominence, maturity, github_stars, and downloads fields contain no data, so ranking is unavailable
- Large payload size if verifiable=1 is set without need, due to per-row hash pre-images
- Stale snapshot: data reflects the latest day but is descriptive only, not real-time

## How this service works

[BATCH+PROOF] Full MCP ecosystem census (21,236 servers, latest day): status, lifecycle, missing_streak, record_hash. DEGRADED DELIVERY, see unavailable_fields - prominence, maturity, github_stars and downloads have no data, so rows are no longer ranked. Snapshot 2026-07-08. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.09 per call.

## Output

A JSON batch payload containing one row per MCP server (up to 21,236 servers), each with: server identifier, status, lifecycle stage, missing_streak (consecutive days absent), and record_hash. When verifiable=1 is set, each row also includes _hash_core (the canonical pre-image for offline hash verification). Note: prominence, maturity, github_stars, and downloads fields are currently unavailable, so rows are not ranked. Returns 422 with no charge if no data is available.

## Request schema (JSON Schema)

```json
{
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "verifiable": {
       "type": "string",
       "description": "optional - set to 1 to attach `_hash_core` per row (the canonical pre-image of the record_hash for that row) so you can recompute and verify fully offline; omitted by default to keep the payload small - for online verification use free GET /gauge/verify?hash="
      }
     },
     "additionalProperties": false
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "const": "json"
    },
    "example": {}
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "entity": "(unlocked on payment)",
  "current": {
   "name": "x711",
   "status": "active",
   "missing_streak": 0
  },
  "lifecycle": {
   "basis": "Imported from the surviving registry (2026-07-25); state is derived from status + missing_streak, 7 consecutive disap...",
   "state": "operating",
   "last_seen": "2026-07-08",
   "first_seen": "2026-07-07",
   "lifespan_days": 1,
   "missing_streak": 0
  },
  "signal_id": "mcp.server-census",
  "source_ref": "https://github.com/modelcontextprotocol",
  "entity_name": "(unlocked on payment)",
  "observed_at": "2026-07-08T00:00:00.000Z",
  "record_hash": "sha256:051650e9a2042e4530442ff7b73a6d8b4d9e943c109994f61a5c92a760e3068f",
  "source_tier": "T2-observable",
  "snapshot_date": "2026-07-08",
  "data_age_hours": 422,
  "hash_core_version": 4
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/truthbear-mcp-ecosystem-census-75433a1b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.truthbear.co](https://www.zero.xyz/host/api.truthbear.co/llms.txt)