# Blockscout Arbitrum Latest Batch Number

> Blockscout Arbitrum Latest Batch Number is a paid API for AI agents from api.blockscout.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Returns the latest batch number from Arbitrum's rollup on the specified chain via Blockscout's API

## Facts

- Endpoint: GET https://api.blockscout.com/%7Bchain_id%7D/api/v2/main-page/arbitrum/batches/latest-number
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/blockscout-arbitrum-latest-batch-number-27aa18d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bYretZXi5HyMMAjPxN2L2

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 blockscout-arbitrum-latest-batch-number-27aa18d3
```

Example prompt: What's the latest Arbitrum batch number right now according to Blockscout? I want to track how far the rollup has progressed.

## When to prefer this

Use this endpoint when you need a quick, single numeric lookup of the latest Arbitrum batch number without requiring full block explorer UI access. Prefer this over general blockchain RPC calls when you specifically need Blockscout's indexed batch data for Arbitrum L2, especially if you are already using Blockscout's API ecosystem for other chain data.

## Known failure modes

- Invalid or unsupported chain_id returns an error or empty response
- Network timeout if Blockscout API is unavailable
- Rate limiting or payment failure (x402 payment required) returns 402 status
- Chain ID not mapped to Arbitrum returns incorrect or no data
- Batch data temporarily unavailable during chain reorganization

## How this service works

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## Output

Returns a single integer representing the latest batch number processed on Arbitrum as tracked by Blockscout's blockchain explorer. This is a raw numeric value (e.g. 0 or a large integer) indicating the highest batch index currently available on the Arbitrum rollup chain.

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": 0
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/blockscout-arbitrum-latest-batch-number-27aa18d3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.blockscout.com](https://www.zero.xyz/host/api.blockscout.com/llms.txt)