# BTC Node API — Bitcoin Whale Transactions

> BTC Node API — Bitcoin Whale Transactions is a paid API for AI agents from api.relai.fi, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).

Returns a list of recent large Bitcoin whale transactions from the blockchain

## Facts

- Endpoint: GET https://api.relai.fi/relay/1780781322365/api/whales
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/btc-node-api-bitcoin-whale-transactions-3c4331fe
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rGV1nyA3zh1Vb9lhvUAeR

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 btc-node-api-bitcoin-whale-transactions-3c4331fe
```

Example prompt: Show me the latest Bitcoin whale transactions — large BTC transfers that have happened recently on-chain.

## When to prefer this

Use this endpoint when you need real-time or recent large Bitcoin transaction data directly from a Bitcoin node, specifically for whale-watching, on-chain analytics, market signal detection, or alerting on large BTC movements. Prefer over generic blockchain explorers when you need programmatic access with a pay-per-call model.

## Known failure modes

- Node connectivity issues returning 503 or timeout
- Empty result set if no whale transactions occurred recently
- 402 payment required if x402 payment not included or insufficient
- Rate limiting returning 429 if called too frequently
- Malformed response if upstream Bitcoin node is syncing

## How this service works

Bitcoin whale transactions

## Output

A list of recent large Bitcoin transactions (whale movements), likely including transaction IDs, wallet addresses, BTC amounts transferred, block height or timestamp, and possibly USD value equivalents.

## Example request

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

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/btc-node-api-bitcoin-whale-transactions-3c4331fe/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.relai.fi](https://www.zero.xyz/host/api.relai.fi/llms.txt)