# Explorer Gateway API — Bitcoin Transaction Lookup

> Explorer Gateway API — Bitcoin Transaction Lookup is a paid API for AI agents from api.blockchain.info, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Fetches detailed information for one or more Bitcoin transactions by their transaction IDs via the Blockchain.info explorer gateway

## Facts

- Endpoint: POST https://api.blockchain.info/explorer-gateway-kt/x402/btc/transactions?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/explorer-gateway-api-bitcoin-transaction-lookup-f9193455
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_tWw7ksCqTdlkgBtT4Z9Ji

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 explorer-gateway-api-bitcoin-transaction-lookup-f9193455 -d '<json body>'
```

Example prompt: Can you look up the details for these Bitcoin transactions on Blockchain.info: [txid1, txid2, txid3]? I need to know the confirmation status, amounts, and block height for each.

## When to prefer this

Use this endpoint when you need to look up one or more Bitcoin (BTC) transaction details using their transaction IDs, especially in batch (up to 50 at once). Prefer this over generic block explorers when you need programmatic, pay-per-use access to Blockchain.info's BTC transaction data without API key setup. It is specifically scoped to Bitcoin — use sibling endpoints for Solana, Ethereum, or Bitcoin Cash.

## Known failure modes

- Invalid or malformed transaction IDs return an error or empty result
- Unconfirmed or mempool transactions may return partial data
- Exceeding the 50 txId array limit results in a request error
- Payment failure (x402) if USDC balance is insufficient
- Network timeouts if the blockchain explorer backend is temporarily unavailable
- Non-Bitcoin txIds (e.g. Ethereum hashes) submitted to the BTC endpoint will fail or return no results

## How this service works

Paid AI-agent access to Blockchain.com Explorer API

## Output

Returns a JSON response containing details for each queried Bitcoin transaction, typically including transaction ID, block height, confirmation count, input/output amounts, fees, timestamps, and sender/receiver addresses.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "txIds": {
   "type": "array",
   "items": {
    "type": "string"
   },
   "maxItems": 50
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "format": "application/json"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/explorer-gateway-api-bitcoin-transaction-lookup-f9193455/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockchain.info](https://www.zero.xyz/host/api.blockchain.info/llms.txt)