# Agent Chain Kit – EVM Block Number

> Agent Chain Kit – EVM Block Number is a paid API for AI agents from built-with-productos-voo8.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).

Returns the current block number for a specified EVM-compatible network (Ethereum, Base, Arbitrum, or Polygon) with multi-RPC failover.

## Facts

- Endpoint: GET https://built-with-productos-voo8.vercel.app/v1/block-number
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-chain-kit-evm-block-number-f9fc8db5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jZhdvxGjrqK1AotAY-Fiq

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 agent-chain-kit-evm-block-number-f9fc8db5
```

Example prompt: What's the current block number on Base right now? I need it in both hex and decimal.

## When to prefer this

Choose this endpoint when you need a reliable, pay-per-call EVM block number lookup with multi-RPC failover across Ethereum, Base, Arbitrum, or Polygon — especially in agent or automation workflows where uptime is critical and you don't want to manage your own RPC node. Prefer it over self-hosted RPC calls when simplicity, failover resilience, and low per-call cost ($0.001 USDC) matter more than maintaining your own infrastructure.

## Known failure modes

- Network not supported — only ethereum, base, arbitrum, polygon are valid enum values
- All RPC endpoints for the selected network are unavailable (multi-RPC failover exhausted)
- Payment failure — missing or invalid x402 payment header results in 402 response
- Rate limiting or upstream RPC timeout causing delayed or failed response

## How this service works

Pay-per-call EVM utility API for AI agents and automation.

## Output

A JSON object containing the current block number as a decimal integer (`block_number`), the same value in hexadecimal (`hex`), and the `network` name that was queried. Example: {"hex":"0x20f85d2","network":"base","block_number":34567890}.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "network": {
       "enum": [
        "ethereum",
        "base",
        "arbitrum",
        "polygon"
       ],
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "hex": "0x20f85d2",
  "network": "base",
  "block_number": 34567890
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-chain-kit-evm-block-number-f9fc8db5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from built-with-productos-voo8.vercel.app](https://www.zero.xyz/host/built-with-productos-voo8.vercel.app/llms.txt)