# Bitcoin Whale Mempool Transactions

> Bitcoin Whale Mempool Transactions is a paid API for AI agents from btcnode.uk, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).

Returns the last 50 unconfirmed Bitcoin mempool transactions over 100 BTC, enabling real-time tracking of large BTC transfers.

## Facts

- Endpoint: GET https://btcnode.uk/api/whales
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/btcnode-uk-4aeca398
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZNZ2FD1EHjm1Mlv78qSbP

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 btcnode-uk-4aeca398
```

Example prompt: What large Bitcoin transactions are currently sitting unconfirmed in the mempool — show me the recent whale moves over 100 BTC.

## When to prefer this

Use this endpoint when you need real-time visibility into large Bitcoin transfers that are pending confirmation — ideal for whale watching, on-chain analytics, market sentiment signals, or detecting large OTC-style movements. Prefer over blockchain explorers when you need fresh mempool data (not just confirmed transactions) and want cost-efficient programmatic access.

## Known failure modes

- Node connectivity issues may return empty or stale mempool data
- If mempool is quiet, fewer than 50 transactions over 100 BTC may be available
- Network congestion may cause delayed response
- HTTP 402 if payment not included or insufficient

## How this service works

Bitcoin blockchain data, address portfolio, transaction tracing, fee forecasting, whale monitoring, SEC EDGAR filings, URL scraping, AI summarization, and Reddit API via x402 micropayments on Base.

## Output

A list of the last 50 unconfirmed Bitcoin mempool transactions each exceeding 100 BTC, including transaction IDs, amounts, sender/recipient addresses, and timestamps for real-time whale activity monitoring.

## 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": 5,
  "transactions": [
   {
    "txid": "000...",
    "fee_sats": 2000,
    "value_btc": 150
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/btcnode-uk-4aeca398/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from btcnode.uk](https://www.zero.xyz/host/btcnode.uk/llms.txt)