# EVM Chain Read – Block Tip (x402)

> EVM Chain Read – Block Tip (x402) is a paid API for AI agents from chain-read.frcompanycheck.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).

Returns the current block number and gas price for a specified EVM chain (Base or Robinhood Chain) via a pay-per-call x402 micropayment API.

## Facts

- Endpoint: GET https://chain-read.frcompanycheck.workers.dev/v1/%7Bchain%7D/block?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/evm-chain-read-block-tip-x402-2f3625e5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZuRef2Q5CVGK7HrAwwiXC

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 evm-chain-read-block-tip-x402-2f3625e5
```

Example prompt: What's the current block number and gas price on Base right now?

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call block tip or gas price lookup on Base or Robinhood Chain without managing API keys or RPC provider subscriptions. It's ideal for agents that need occasional onchain reads and want micropayment billing via x402 USDC rather than a monthly subscription.

## Known failure modes

- Unsupported chain ID returns an error — only Base (8453) and Robinhood Chain (4663) are supported
- Missing or failed x402 USDC payment on Base results in a 402 Payment Required response
- RPC node unavailability may cause timeout or 5xx error
- Malformed chain path parameter returns a 400 or 404 error

## How this service works

Pay-per-call EVM reads on Base (8453) and Robinhood Chain (4663): native balance, block tip, ERC-20 meta/balance/allowance, is-contract. Public RPCs, no API key. x402 USDC on Base.

## Output

A JSON object containing the chain name, chain ID, current block number, current gas price in wei, and the reported chain ID as confirmed by the RPC node.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "chain": "base",
  "chain_id": 8453,
  "block_number": 52000000,
  "gas_price_wei": "1000000",
  "reported_chain_id": 8453
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/evm-chain-read-block-tip-x402-2f3625e5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chain-read.frcompanycheck.workers.dev](https://www.zero.xyz/host/chain-read.frcompanycheck.workers.dev/llms.txt)