# Carbon Cashmere BTC On-Chain Pulse Analytics

> Carbon Cashmere BTC On-Chain Pulse Analytics is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns a comprehensive snapshot of Bitcoin network health including mempool pressure z-score, hashrate momentum, fee regime, UTXO velocity, SegWit adoption, and difficulty adjustment prediction from a live Bitcoin Core full node.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/onchain-pulse/btc
- 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/api-carbon-cashmere-de-dd1245f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tPZ4hwwofAWhkGco_rYMW

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-dd1245f9
```

Example prompt: Can you pull the latest Bitcoin on-chain pulse — I want to see current mempool pressure, fee regime, hashrate trend, SegWit adoption, and how far we are from the next difficulty adjustment?

## When to prefer this

Use this endpoint when you need a multi-dimensional snapshot of Bitcoin network health from a single call — combining fee market, mempool congestion, miner activity, and adoption metrics together. Prefer this over generic block explorer APIs when you need statistically enriched signals like 30-day z-scores, momentum ratios, and trend classifications rather than raw block data. Best for research agents, crypto dashboards, and automated monitoring workflows that need actionable on-chain context about Bitcoin network conditions.

## Known failure modes

- Node sync lag may produce stale cache_hit=true data if Bitcoin Core is behind chain tip
- mempool metrics may be near-zero during low-activity periods, making z-scores less meaningful
- taproot_pct and hash_ribbon_status may return null if the node lacks sufficient historical data
- HTTP 402 Payment Required if x402 USDC payment header is missing or invalid
- HTTP 503 if the Postgres cache or Bitcoin Core node is temporarily unavailable

## How this service works

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

## Output

A JSON object with seven sections: mempool (regime, size_mb, tx_count, pressure z-score over 30d, total_fees_btc), fees (regime, next_block and six_block sat/vb estimates, 90d percentile rank), hashrate (current EH/s, 7d/30d momentum, trend label), difficulty_adjustment (blocks_until, predicted_delta_pct, hash_ribbon_status), utxo (count, 24h velocity, total_supply_btc), adoption (segwit_pct, taproot_pct, 30d slopes), and _meta (timestamp, source, cache_hit, disclaimer).

## Example request

```json
{
 "input": {
  "type": "http",
  "method": "GET",
  "queryParams": {}
 }
}
```

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "fees": {
   "regime": "low",
   "percentile_90d": 0.12,
   "next_block_satvb": 2
  },
  "utxo": {
   "count": 178400000,
   "velocity_24h": 48000,
   "total_supply_btc": 19847000
  },
  "_meta": {
   "source": "local_bitcoin_core_node",
   "disclaimer": "Informational research data only — not investment advice."
  },
  "mempool": {
   "regime": "calm",
   "size_mb": 1.9,
   "pressure": "low",
   "pressure_z_30d": -0.4
  },
  "adoption": {
   "segwit_pct": 0.91,
   "segwit_slope_30d": 0.003
  },
  "hashrate": {
   "trend": "expanding",
   "current_eh": 884.7,
   "momentum_7d": 0.021
  },
  "difficulty_adjustment": {
   "blocks_until": 1316,
   "hash_ribbon_status": "bullish_crossover",
   "predicted_delta_pct": 2.4
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-dd1245f9/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)