# TruthBear Stablecoin Graveyard Register

> TruthBear Stablecoin Graveyard Register is a paid API for AI agents from api.truthbear.co, paid per call via x402, $0.09/call, status unknown (last checked 2026-09-14).

Returns a historical death register of stablecoins that have been terminated — defined as collapsing below $0.10 or becoming persistently absent — with optional per-row cryptographic hash proofs for offline verification.

## Facts

- Endpoint: GET https://api.truthbear.co/stable/graveyard
- Price: $0.09/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/truthbear-stablecoin-graveyard-register-746bf333
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LIsZiJ8Qa4Gy6Wv00-9xY

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-stablecoin-graveyard-register-746bf333
```

Example prompt: Can you pull the full stablecoin graveyard register — I want to see every stablecoin that's been declared dead (dropped below $0.10 or vanished), and include the per-row hash proof so I can verify the records offline?

## When to prefer this

Choose this endpoint when you need a neutral, structured, auditable register of historically failed stablecoins — especially when cryptographic proof of each record is required for offline verification. It is purpose-built for stablecoin mortality data rather than live price feeds, peg-tracking, or general crypto market data.

## Known failure modes

- 422 no_charge — no graveyard data available; caller is not billed
- Missing or malformed query parameters may result in unexpected empty responses
- Network or payment (x402) failures may prevent the call from completing

## How this service works

[BATCH+PROOF] Stablecoin death register - terminated below 0.10 or persistently absent. Add ?verifiable=1 for per-row _hash_core, fully offline-recomputable. A neutral observation record: not a rating, not an endorsement. Descriptive only, never a forecast or advice. No data -> 422 no_charge, not billed. $0.09 per call.

## Output

A JSON list of terminated stablecoin records, each containing the stablecoin identity, the death condition (below $0.10 or persistently absent), and associated metadata. When the verifiable=1 query parameter is set, each row also includes a _hash_core field — a canonical pre-image of the record hash — allowing full offline cryptographic recomputation and verification. If no data is available the API returns a 422 no_charge error and the caller is not billed.

## 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": "basis-cash-bac",
  "current": {
   "state": "dead",
   "ongoing": false,
   "death_type": "depeg-abandoned",
   "lifespan_days": 152
  },
  "lifecycle": {
   "peg": "usd",
   "state": "dead",
   "end_at": "2021-05-01",
   "issuer": "Basis Cash (anon)",
   "context": "The algorithmic stablecoin BAC traded below USD 1 for a long period and never regained its peg; after the seigniorage...",
   "ongoing": false,
   "birth_at": "2020-11-30",
   "mechanism": "algorithmic",
   "death_type": "depeg-abandoned",
   "lifespan_days": 152
  },
  "signal_id": "stablecoin.lifecycle",
  "source_ref": "https://www.coingecko.com/en/coins/basis-cash",
  "entity_name": "Basis Cash (BAC)",
  "observed_at": "2026-08-24T15:00:00.121Z",
  "record_hash": "sha256:664da5b5c8cc399928a3149a49732e15d67f66d69b683e1469c0ab9871d8d702",
  "source_tier": "T1",
  "snapshot_date": "2026-08-24",
  "data_age_hours": 0,
  "hash_core_version": 4
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/truthbear-stablecoin-graveyard-register-746bf333/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)