# Mint Intel: Base Block Header by Number

> Mint Intel: Base Block Header by Number is a paid API for AI agents from mintintel.35-171-220-195.sslip.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).

Fetches a Base chain block header by number, hex, or tag (latest/finalized/safe) including hash, parent, timestamp, fee recipient, gas stats, base fee, tx count, and first 25 tx hashes.

## Facts

- Endpoint: GET https://mintintel.35-171-220-195.sslip.io/v1/base/block/:block?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/mint-intel-base-block-header-by-number-27434e34
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wnSaDB7c3IvqUm_RNExnY

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 mint-intel-base-block-header-by-number-27434e34
```

Example prompt: Can you pull the block header for the latest finalized block on Base — I need the hash, gas utilization, base fee, and how many transactions it contains?

## When to prefer this

Use this endpoint when you need structured block-level metadata for the Base L2 chain — gas stats, base fee, fee recipient, tx count, or block hash — by a specific number, hex, or canonical tag (latest/finalized/safe). Prefer this over Ethereum equivalents when working specifically on Base. It handles future blocks gracefully with a 404 and no charge, making it safe for polling loops.

## Known failure modes

- 404 if the requested block number is in the future (not yet mined) — not charged
- Invalid block tag returns an error
- Malformed hex block number (missing 0x prefix or invalid characters) may cause a bad request
- Network or RPC timeout may cause a 5xx response

## How this service works

Base block header by number, hex or tag (latest / finalized / safe) via eth_getBlockByNumber - hash, parent, timestamp and age, fee recipient, gas used/limit and utilization, base fee, tx count and the first 25 tx hashes. Future block -> 404, not charged.

## Output

Returns a JSON object with the block number, hash, parent hash, timestamp and age, fee recipient address, gas used, gas limit, gas utilization percentage, base fee in wei, transaction count, and an array of the first 25 transaction hashes. Returns 404 for future (non-existent) block numbers without charging.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "block"
     ],
     "properties": {
      "block": {
       "type": "string",
       "description": "block number (decimal or 0x hex), latest, finalized or safe"
      }
     },
     "additionalProperties": false
    },
    "queryParams": {
     "type": "object",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "number",
      "hash",
      "txCount"
     ],
     "properties": {
      "hash": {
       "type": "string"
      },
      "number": {
       "type": "integer"
      },
      "txCount": {
       "type": "integer"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mint-intel-base-block-header-by-number-27434e34/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mintintel.35-171-220-195.sslip.io](https://www.zero.xyz/host/mintintel.35-171-220-195.sslip.io/llms.txt)