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Bitcoin UTXO Lookup by Address
x402
Bitcoin UTXO Lookup by Address is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-01).
Returns all spendable unspent transaction outputs (UTXOs) for a given Bitcoin address
Price / call$0.005
Success—
StatusUnknown
How this service works
Every spendable UTXO at a Bitcoin address — Genesis402 / UnyKorn Operator Network
Output
A JSON object with ok:true, a type of 'btc-utxos', a receipt object containing the transaction hash, USD amount charged, and receipt ID, plus a generated_at ISO8601 timestamp. The core payload lists all spendable UTXOs associated with the queried Bitcoin address, enabling coin selection, balance calculation, or transaction construction.
Example use cases
Coin selection before sending Bitcoin
“I'm about to send 0.05 BTC from bc1qar0srrr7xfkvy5l643lydnw9re59gtzzwf5mdq — can you fetch all the spendable UTXOs at that address so I can pick the right inputs for the transaction?”
Wallet balance reconstruction from UTXOs
“Can you pull every unspent output for bc1q34aq5auelf0ntp9haecxa4e4exj3eur4z0nkrv so I can add them up and verify the total spendable balance?”
UTXO consolidation planning
“I need to consolidate UTXOs at bc1qm34lsc65zpw79lxes69zkqmk6ee3ewf0j77s3h — fetch all the spendable outputs so I can figure out how many inputs I'll need and estimate the fee.”
Technical details
Endpoint
POSThttps://twin.unykorn.org/btc-utxos?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a complete, current list of all spendable UTXOs for a Bitcoin address — particularly useful before constructing a raw transaction, performing coin selection, or auditing a wallet's spendable balance. It is part of the UnyKorn operator network alongside complementary Bitcoin utilities (fee rates, block height, script identification), making it a good fit when you are already using that network for other Bitcoin on-chain queries.
Side effects
- Invalid Bitcoin address format returns an error response
- Address with no UTXOs returns an empty list
- Network or node connectivity issues may return a timeout or service error
- Malformed request body (missing params.address) returns a validation error
- Payment failure via x402 protocol prevents the call from being processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| params | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"type": "btc-utxos",
"receipt": {
"tx_hash": "0x<64hex>",
"amount_usd": 0.005,
"receipt_id": "g402-<16hex>"
},
"generated_at": "<iso8601>"
}
}Tags
x402
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