# Glassnode Probably Lost BTC Supply

> Glassnode Probably Lost BTC Supply is a paid API for AI agents from x402.glassnode.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns the estimated supply of 'zombie' BTC coins inactive since the first exchange launch in July 2010, including Patoshi-mined coins.

## Facts

- Endpoint: GET https://x402.glassnode.com/v1/metrics/supply/probably_lost
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/glassnode-probably-lost-btc-supply-5c985719
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sQitnArdD7xxH5XtQG6L2

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 glassnode-probably-lost-btc-supply-5c985719
```

Example prompt: What does Glassnode estimate as the probably lost Bitcoin supply — the zombie coins inactive since the first BTC exchange launched in July 2010, including Patoshi-mined coins? Give me the latest figure in native BTC.

## When to prefer this

Use this endpoint when you need Glassnode's authoritative estimate of permanently lost Bitcoin supply, specifically the 'probably lost' metric covering pre-exchange-era dormant coins and Patoshi-mined BTC. Prefer this over generic supply endpoints when the research focus is on zombie coins, lost supply estimation, or effective circulating supply analysis.

## Known failure modes

- Missing required 'a' query parameter (must be 'BTC') returns 400 error
- Invalid currency or format enum value returns 400 error
- Payment not processed or insufficient USDC balance returns 402 Payment Required
- Rate limiting or quota exceeded returns 429
- Glassnode upstream data unavailable returns 503

## How this service works

Probably Lost Supply — The estimated supply of "zombie" BTC, coins that have been inactive since the launch of the first BTC exchange in July 2010. Patoshi-mined coins are included in this category. Data by Glassnode.

## Output

Returns a time-series array of objects, each with a Unix timestamp (t) and the estimated probably-lost BTC supply value (v), representing coins considered permanently dormant since before July 2010.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "a"
     ],
     "properties": {
      "a": {
       "enum": [
        "BTC"
       ],
       "type": "string",
       "description": "Asset symbol, e.g. BTC, ETH"
      },
      "c": {
       "enum": [
        "native",
        "usd"
       ],
       "type": "string",
       "description": "Currency for denominated values, e.g. usd, native"
      },
      "f": {
       "enum": [
        "csv",
        "json"
       ],
       "type": "string",
       "description": "Response format: json or csv"
      },
      "i": {
       "enum": [
        "24h"
       ],
       "type": "string",
       "description": "Time interval / resolution, e.g. 24h, 1w, 1month"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "array",
     "items": {
      "type": "object",
      "properties": {
       "t": {
        "type": "number"
       },
       "v": {
        "type": "number"
       }
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/glassnode-probably-lost-btc-supply-5c985719/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.glassnode.com](https://www.zero.xyz/host/x402.glassnode.com/llms.txt)