# Bitcoin UTXO Set Analysis

> Bitcoin UTXO Set Analysis is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.05/call, status down (last checked 2026-09-14).

Returns a snapshot of the Bitcoin UTXO set including total UTXO count, total BTC amount, and disk size for HODLer and network health analysis.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/onchain/utxo
- Price: $0.05/call
- Payment: x402
- Status: down
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-bc0954ef
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qoYz6JFrgOKReo4cQzBy0

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 api-carbon-cashmere-de-bc0954ef
```

Example prompt: Pull the latest Bitcoin UTXO set analysis for me — I want to see the total number of UTXOs, how much BTC is sitting in them, and the current disk size so I can assess HODLer accumulation trends.

## When to prefer this

Choose this endpoint when you need current Bitcoin UTXO set statistics for on-chain analysis, HODLer behavior tracking, or supply-side intelligence. It is ideal for agents monitoring Bitcoin network health, performing macro BTC analysis, or building dashboards around unspent output metrics. Prefer it over generic price feeds when the focus is structural on-chain data rather than market price.

## Known failure modes

- API returns 402 if payment header is missing or insufficient
- Network timeout if Bitcoin node is temporarily unreachable
- Empty or stale UTXO data if the underlying node is syncing
- Rate limiting if called too frequently without valid payment

## How this service works

Professional crypto market intelligence. Real-time prices, signals, and market scoring.

## Output

Returns a UTXO array and summary metrics including the total number of UTXOs currently in the Bitcoin UTXO set, the aggregate BTC amount across all unspent outputs, and the disk size of the UTXO set — useful for tracking HODLer accumulation patterns and overall Bitcoin network growth.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "utxo": [
   {
    "txouts": 180000000,
    "disk_size_mb": 12500,
    "total_amount_btc": 19700000
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-bc0954ef/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.carbon-cashmere.de](https://www.zero.xyz/host/api.carbon-cashmere.de/llms.txt)