# Bitcoin Transaction Lookup with Fee Rate and Confirmation Status

> Bitcoin Transaction Lookup with Fee Rate and Confirmation Status 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).

Fetches details for a single Bitcoin transaction by txid, including its fee rate and confirmation status

## Facts

- Endpoint: POST https://twin.unykorn.org/btc-tx?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/bitcoin-transaction-lookup-with-fee-rate-and-confirmation-status-b4f4821f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7r5azeW5YrWBj6HBgHxHc

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 bitcoin-transaction-lookup-with-fee-rate-and-confirmation-status-b4f4821f -d '<json body>'
```

Example prompt: Can you look up Bitcoin transaction a1b2c3d4e5f6... and tell me whether it's confirmed and what fee rate was used?

## When to prefer this

Choose this endpoint when you need a fast, pay-per-use lookup of a single Bitcoin transaction's fee rate and confirmation status without managing your own Bitcoin node or indexer. It's well-suited for agents that occasionally need to verify BTC payments or check transaction finality without a recurring subscription.

## Known failure modes

- Invalid or malformed txid (not 64 hex characters) returns a validation error
- Transaction not found on Bitcoin network returns a not-found or null result
- Network timeout or upstream Bitcoin node unavailability
- Payment failure (insufficient USDC balance for x402 payment of $0.005)

## How this service works

One Bitcoin transaction with its fee rate and confirmation status — Genesis402 / UnyKorn Operator Network

## Output

Returns a JSON object with ok status, a type field ('btc-tx'), a payment receipt containing the tx_hash, amount_usd charged, and a receipt_id, plus a generated_at ISO8601 timestamp. The core Bitcoin transaction data includes fee rate and confirmation status for the queried txid.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "txid": {
     "type": "string",
     "pattern": "^[0-9a-fA-F]{64}$"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "type": "btc-tx",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.005,
   "receipt_id": "g402-<16hex>"
  },
  "generated_at": "<iso8601>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/bitcoin-transaction-lookup-with-fee-rate-and-confirmation-status-b4f4821f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)