# Bitcoin Whale Transaction Feed (Carbon Cashmere)

> Bitcoin Whale Transaction Feed (Carbon Cashmere) 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).

Streams large Bitcoin transactions (>10 BTC by default) enriched with fee-rate, RBF flag, and ancestor-count metadata for on-chain whale activity monitoring.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/btc-derivatives/whale-stream
- 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-132b9316
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-VhUrt88jBJco5FkZP7sv

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-132b9316
```

Example prompt: Pull the latest Bitcoin whale transaction feed and show me any transactions over 10 BTC, including the fee-rate, whether they have RBF enabled, and how many ancestor transactions they have.

## When to prefer this

Use this endpoint when you need real-time Bitcoin whale transaction intelligence from a self-hosted node with enriched metadata (fee-rate, RBF, ancestor-count) rather than a generic blockchain explorer API. Ideal for agents monitoring large on-chain movements, detecting mempool congestion signals, or flagging high-fee replacement transactions.

## Known failure modes

- No transactions returned if mempool is quiet or threshold is too high
- Truncated response for very high-volume periods (response size limit)
- Stale data if node is temporarily out of sync
- HTTP 402 if payment header is missing or insufficient (x402 protocol)
- Rate limiting or timeout under heavy load

## How this service works

Bitcoin whale transaction feed (>10 BTC default) with fee-rate, RBF flag, ancestor-count enrichment. ⚠️ output_btc includes change-outputs — activity proxy, not net transfer.

## Output

A feed of large Bitcoin transactions (defaulting to >10 BTC threshold) enriched with fee-rate in sat/vB, an RBF (replace-by-fee) boolean flag, and ancestor-count per transaction. Note: output_btc includes change outputs and reflects activity volume, not net transfer amount.

## 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": {
  "count": 4015,
  "min_btc": 10,
  "total_btc": 81243.7,
  "since_hours": 24,
  "transactions": [
   {
    "btc": 87.5,
    "rbf": false,
    "txid": "5c13094485f0...",
    "ancestor_count": 1,
    "fee_rate_sat_vb": 3.2
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-132b9316/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)