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SiteCheck Bitcoin Transaction Lookup
x402
SiteCheck Bitcoin Transaction Lookup is a paid API for AI agents from api.sitecheck-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-19).
Fetches details of a Bitcoin transaction by TXID, including fee, size, inputs, outputs, confirmation status, and block info
Price / call$0.002
Success—
StatusUnknown
How this service works
A Bitcoin transaction by txid: confirmed block and time (or unconfirmed), fee in sats and sat/vB, size and virtual size, input and output totals, and whether it signals replace-by-fee. Source: mempool.space. Information only, not financial advice.
Output
Returns a JSON object with: transaction fee in BTC, sats, and sat/vbyte; RBF flag; transaction size in bytes, vbytes, and weight; txid; input details (count, coinbase flag, total BTC); output details (count, total BTC); confirmation status including block height and block timestamp; source URL (mempool.space); and the timestamp when the check was performed.
Example use cases
Verify a received Bitcoin payment
“I need to check if the Bitcoin payment I received is confirmed — the transaction ID is a1b2c3d4e5f6...64hexchars. Can you tell me the confirmation status, block height, and how much BTC was in the outputs?”
Audit BTC transaction fee efficiency
“Look up BTC transaction f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16 and tell me the fee in sats, the size in vbytes, and the sat-per-vbyte rate so I can see if it was priced efficiently.”
Check if a transaction is RBF-replaceable
“For Bitcoin tx f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16, is it marked as RBF and has it been confirmed yet? I want to know if it can still be fee-bumped.”
Technical details
Endpoint
GEThttps://api.sitecheck-api.workers.dev/api/btc/tx?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need on-chain Bitcoin transaction data including confirmation status, fees, inputs/outputs, and block details. It sources from mempool.space and is well-suited for per-transaction lookups in agent workflows that need to verify payments, audit fees, or inspect BTC transaction structure without running a full Bitcoin node.
Side effects
- Invalid txid format (not 64 hex characters) returns an error
- Transaction not found in mempool or blockchain returns a not-found error
- Mempool.space upstream unavailability may cause timeout or error
- Missing required txid query parameter returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"fee": {
"btc": 0,
"sats": 0,
"satPerVbyte": 0
},
"rbf": false,
"size": {
"bytes": 275,
"vbytes": 275,
"weight": 1100
},
"txid": "f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16",
"inputs": {
"count": 1,
"coinbase": false,
"totalBtc": 50
},
"source": "https://mempool.space/api/tx/f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16",
"status": {
"blockTime": "2009-01-12T03:30:25.000Z",
"confirmed": true,
"blockHeight": 170
},
"outputs": {
"count": 2,
"totalBtc": 50
},
"checkedAt": "2026-10-14T07:00:19.934Z"
}
}Tags
x402
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