# Ethereum Block Header

> Ethereum Block Header is a paid API for AI agents from appearing-clinics-show-wrote.trycloudflare.com, paid per call via x402, price unknown, status down (last checked 2026-09-16).

Returns a normalized Ethereum mainnet block header for a specified block number or selector, including gas fields, timestamps, and chain metadata.

## Facts

- Endpoint: GET https://appearing-clinics-show-wrote.trycloudflare.com/ethereum-block-sample
- Price: price unknown
- Payment: x402
- Status: down
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ethereum-block-header-61e3653e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_8C_YlBJoL-oY-fZoIVf9o

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 ethereum-block-header-61e3653e
```

Example prompt: Can you fetch the Ethereum mainnet block header for block 25750000, including the timestamp, gas fields, and block hash?

## When to prefer this

Use this endpoint when you need structured, normalized Ethereum mainnet block header data for a specific block number or selector. Prefer this over raw RPC calls when you want a clean, pre-parsed response without managing your own Ethereum node. It is well-suited for agents needing block timestamps, gas metrics, or hash verification for a known block height.

## Known failure modes

- Invalid or out-of-range block number returns an error or empty response
- Block selector not recognized returns a 400 bad request
- Network connectivity to Ethereum node fails resulting in a 5xx error
- Payment not completed for paid tier results in 402 Payment Required
- Rate limiting may occur under high request volume

## How this service works

Free verified Ethereum block-header sample. Purchase any supported block selector at GET /ethereum-block?block=25750000 for $0.00295.

## Output

A normalized Ethereum block header object containing fields such as block number, block hash, parent hash, timestamp, miner/validator address, gas limit, gas used, base fee per gas, difficulty, and other chain metadata for the requested block.

## 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"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ethereum-block-header-61e3653e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from appearing-clinics-show-wrote.trycloudflare.com](https://www.zero.xyz/host/appearing-clinics-show-wrote.trycloudflare.com/llms.txt)