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Bitcoin Whale Alert Transfers
x402
Bitcoin Whale Alert Transfers is a paid API for AI agents from api.chainmarket-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-24).
Returns large Bitcoin transactions from the latest block, filtered by minimum BTC output, sourced from mempool.space
Price / call$0.002
Success—
StatusUnknown
How this service works
Bitcoin large transactions in the latest block from mempool.space: total output in BTC, fee, txid and block height, filtered by minBtc. Bitcoin only (no ETH or SOL). Covers the first 25 transactions of the tip block; output total includes change, so it is transaction size, not one wallet's transfer.
Output
Returns a JSON object with a count of matching transactions, the source block hash, the timestamp of the check, and an array of transaction records each containing txid, fee in satoshis, block time, input count, output count, block height, and total output in BTC.
Example use cases
Whale alert dashboard feed
“Pull the 25 biggest Bitcoin transfers from the latest block, only showing ones that moved at least 5 BTC, so I can populate my whale alert feed.”
Detect large BTC movement
“Check if any Bitcoin transactions over 50 BTC have occurred in the most recent block — I'm watching for whale movements that might signal a market shift.”
On-chain research snapshot
“Give me up to 10 recent Bitcoin transactions that transferred at least 1 BTC, including their txids, block height, and total output amounts, for my on-chain research report.”
Technical details
Endpoint
GEThttps://api.chainmarket-api.workers.dev/api/crypto/whale-alert-transfers?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time, pay-per-call access to large Bitcoin on-chain transactions without API keys or subscriptions. Ideal for agents monitoring whale activity, building alert systems, or doing lightweight on-chain research. Prefer this over exchange APIs when you need raw blockchain-level transfer data rather than trading volume or order book data.
Side effects
- Payment failure if insufficient USDC balance — call not charged on failure
- Invalid limit value outside 1–25 range returns error
- Invalid minBtc value outside 0.01–10000 range returns error
- Upstream mempool.space unavailability may cause timeout or empty response
- No transactions matching the minBtc threshold returns empty transfers array
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"count": 3,
"source": "https://mempool.space/api/block/000000000000000000015d1494dfcf12bfc97f6ff50eec3c622091e707183436/txs",
"blockHash": "000000000000000000015d1494dfcf12bfc97f6ff50eec3c622091e707183436",
"checkedAt": "2026-10-23T09:35:53.973Z",
"transfers": [
{
"txid": "ab4f2d8e06db1c799dabdc5716288e8e128cec6af79f3122fe415aa9732a79c5",
"feeSats": 0,
"blockTime": "2026-10-23T09:27:57.000Z",
"inputCount": 1,
"blockHeight": 972749,
"outputCount": 6,
"totalOutputBtc": 3.13056286
},
{
"txid": "ca2949e6d137d0dd135381185e22d8396a45fadbeb1e3836899fe7a832054d3c",
"feeSats": 6195,
"blockTime": "2026-10-23T09:27:57.000Z",
"inputCount": 5,
"blockHeight": 972749,
"outputCount": 2,
"totalOutputBtc": 1.09203195
}
]
}
}Tags
x402
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