# Blockchain.com Explorer – Block Transactions

> Blockchain.com Explorer – Block Transactions is a paid API for AI agents from api.blockchain.info, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-02).

Retrieves a paginated, sortable list of transactions within a specific Bitcoin block identified by hash or height

## Facts

- Endpoint: POST https://api.blockchain.info/explorer-gateway-kt/x402/btc/block/transactions?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockchain-com-explorer-block-transactions-49466836
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__vDb2Yr1_Rg9SatLW85gM

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 blockchain-com-explorer-block-transactions-49466836 -d '<json body>'
```

Example prompt: Show me the first 20 transactions in Bitcoin block 850000, sorted by fee in descending order.

## When to prefer this

Use this endpoint when you need transaction-level detail for a specific Bitcoin block, especially with sorting and pagination control. Prefer this over full-block endpoints when you only need a subset of transactions or want to sort by fee/value. Ideal for block explorers, chain analytics, and auditing tools that need to page through large blocks efficiently.

## Known failure modes

- Both hash and height provided simultaneously — API likely rejects or ignores one
- Invalid block hash (not 64 hex characters) — returns error
- Block height not found (future or invalid block) — returns empty or error
- Offset beyond total transactions — returns empty page (not an error)
- Limit exceeding 50 — capped or rejected
- Payment failure (x402 protocol) — access denied without USDC payment

## How this service works

Paid AI-agent access to Blockchain.com Explorer API

## Output

Returns a paginated list of transactions from the specified Bitcoin block, ordered by the chosen sort field (index, value, or fees). Each page contains up to 50 transaction entries with details sufficient for block exploration and analysis. An offset beyond the total transaction count returns an empty page rather than an error.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "hash": {
   "type": "string",
   "example": "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f",
   "description": "Block hash — exactly 64 hex characters. Provide either hash or height, not both."
  },
  "sort": {
   "enum": [
    "index",
    "value",
    "fees"
   ],
   "type": "string",
   "default": "index",
   "description": "`index` orders by position in the block, `value` by summed output value, `fees` by fee. Ties always fall back to block position, so paging can neither duplicate nor skip a transaction.\n"
  },
  "limit": {
   "type": "integer",
   "default": 15,
   "maximum": 50,
   "minimum": 1,
   "description": "Page size (capped at 50)"
  },
  "order": {
   "enum": [
    "asc",
    "desc"
   ],
   "type": "string",
   "default": "asc"
  },
  "height": {
   "type": "integer",
   "format": "int64",
   "example": 850000,
   "description": "Block height (non-negative integer). Provide either hash or height, not both."
  },
  "offset": {
   "type": "integer",
   "default": 0,
   "minimum": 0,
   "description": "Offset into the sorted transaction list. An offset beyond `total` returns an empty page, not an error."
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockchain-com-explorer-block-transactions-49466836/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)