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Block Hash at a Given Bitcoin Height
x402
Block Hash at a Given Bitcoin Height is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Returns the block hash for a specified Bitcoin block height
Price / call$0.003
Success—
StatusUnknown
How this service works
Block hash at a given Bitcoin height — Genesis402 / UnyKorn Operator Network
Output
Returns a JSON object with a boolean ok field, an endpoint type identifier, the block hash at the requested height, a payment receipt (including transaction hash, USD amount, and receipt ID), and a generated_at ISO8601 timestamp.
Example use cases
Verify Bitcoin block anchor
“Can you look up the block hash at Bitcoin height 800000 so I can verify my timestamp anchor is pointing to the right block?”
Halving block hash lookup
“What's the block hash for the Bitcoin block at height 840000 — the most recent halving?”
Audit trail block reference
“I need the block hash for Bitcoin block number 500000 to include in an audit report as an on-chain reference point.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/btc-block-at-height?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to resolve a specific Bitcoin block height to its canonical block hash, particularly in blockchain auditing, timestamp verification, or cross-chain reference scenarios. Prefer this over manual RPC calls when you need a simple pay-per-call REST interface without running your own Bitcoin node.
Side effects
- Invalid or negative height value — returns an error response
- Height exceeds current chain tip — block does not yet exist
- Network or upstream Bitcoin node unavailability — may return a 5xx or error payload
- Payment failure — x402 payment not accepted, request not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "btc-block-at-height",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.003,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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