# Vextorium EVM Block Header Lookup

> Vextorium EVM Block Header Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-15).

Fetches block header data (hash, parent, timestamp, producer, gas metrics, base fee, tx count) by block number or tag across 12 EVM-compatible chains

## Facts

- Endpoint: POST https://api.vextorium.com/v1/evm-block?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-evm-block-header-lookup-cbf04f71
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LQBpkCO01PNN7GAMQIfjk

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 vextorium-evm-block-header-lookup-cbf04f71 -d '<json body>'
```

Example prompt: Can you pull the block header for block number 52091075 on Base — I need the hash, parent hash, gas used, base fee in gwei, and how many transactions were in it?

## When to prefer this

Use this endpoint when you need structured, normalized block header data across multiple EVM chains in a single unified API — especially useful for multi-chain monitoring, blockchain analytics, or when you need gas metrics and block metadata without running your own node or dealing with raw RPC calls.

## Known failure modes

- Invalid or non-existent block number returns null fields or an error
- Unsupported network name causes validation failure
- Block tag (latest/safe/finalized) unavailable on some chains returns error
- Malformed request body (wrong bodyType or missing required fields) returns 400
- Network congestion or node unavailability causes timeout or 5xx error

## How this service works

558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.

## Output

Returns a JSON object with block number, hash, parent hash, network name, ISO timestamp, producer address, used gas, gas limit, gas usage percentage, block size in bytes, transaction count, base fee in gwei, and optionally transaction hashes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "number": {
   "type": "string"
  },
  "network": {
   "enum": [
    "base",
    "ethereum",
    "arbitrum",
    "optimism",
    "polygon",
    "bnb",
    "avalanche",
    "gnosis",
    "line",
    "scroll",
    "sonic",
    "unichain"
   ],
   "type": "string",
   "description": "Chain (default base)"
  },
  "tx_include": {
   "type": "boolean"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "date": "2026-10-02T20:04:57+00:00",
  "hash": "0xb6ef30f50b707c8ba2bfff9b57a94ae64540545506de1ac20db38d0216ad80be",
  "number": 52091075,
  "parent": "0x29759d0a3f90560c64e85952a84b1eef7d97f3d039e553cfeb9ceba69378e9a5",
  "network": "base",
  "producer": "0x4200000000000000000000000000000000000011",
  "used_gas": 41906338,
  "gas_limit": 400000000,
  "size_bytes": 189493,
  "transactions": 156,
  "base_fee_gwei": 0.005,
  "gas_usage_pct": 10.48
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-evm-block-header-lookup-cbf04f71/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)