# Bitcoin RBF-Pulse Whale Analytics

> Bitcoin RBF-Pulse Whale Analytics is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.02/call, status down (last checked 2026-09-15).

Returns BIP125 Replace-By-Fee analytics for large Bitcoin transactions, including RBF-flagged counts, confirmation rates, BTC value distribution, fee-rate premiums, and mempool fullrbf policy state.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/bitcoin/rbf-pulse
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-bc8d862c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ah9JXsIY8w6KBnEuuCumq

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-bc8d862c
```

Example prompt: Pull the latest RBF-pulse data for Bitcoin whale transactions — I want to see how many large txs are flagged for replace-by-fee, what the fee-rate premium is over non-RBF transactions, and whether fullrbf policy is active in the mempool right now.

## When to prefer this

Use this endpoint when you need specialized RBF analytics specifically scoped to whale (large-value) Bitcoin transactions, with fee-rate premium comparison and mempool fullrbf policy state. Prefer this over generic mempool explorers when the research question is specifically about replace-by-fee behavior, fee flexibility costs, or large-transaction RBF adoption rates.

## Known failure modes

- ZMQ stream unavailable — may return 503 or stale data if internal node connection drops
- No whale transactions in recent window — could return zeroes or empty distributions
- Rate limiting at $0.08/call — x402 payment required, failure to attach valid payment returns 402
- Temporary mempool snapshot lag may cause slight staleness in fullrbf policy field
- Network timeouts if Bitcoin node is syncing or behind chain tip

## How this service works

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

## Output

Returns a JSON object containing: count of RBF-flagged whale transactions, confirmation rate of those transactions, BTC value distribution across size buckets, fee-rate premium percentage that RBF users pay versus non-RBF transactions, and current mempool fullrbf policy state. Data is sourced from a proprietary ZMQ stream tracking whale transactions.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "rbf": {
   "count": 1247,
   "total_btc": 8942.3,
   "pct_of_whales": 0.169,
   "confirmation_rate": 0.932
  },
  "_meta": {
   "disclaimer": "Informational research data only — not investment advice."
  },
  "non_rbf": {
   "count": 6131,
   "total_btc": 47293.8
  },
  "window_hours": 24,
  "mempool_state": {
   "unbroadcast_count": 12,
   "fullrbf_node_policy": true
  },
  "whale_tx_count": 7378,
  "fee_rate_median_satvb": {
   "rbf": 18.5,
   "non_rbf": 4.2,
   "rbf_premium_pct": 340.5
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-bc8d862c/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)