# Synapse API — Arbitrum Latest Block

> Synapse API — Arbitrum Latest Block is a paid API for AI agents from synapse-api-brown.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-13).

Fetches the most recent block data from the Arbitrum blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/arbitrum/block/latest?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-arbitrum-latest-block-bdd24fda
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6w6gd0h_P4dt-Qal1C4sI

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 synapse-api-arbitrum-latest-block-bdd24fda -d '<json body>'
```

Example prompt: What is the latest block on the Arbitrum network right now? I need the block number and timestamp.

## When to prefer this

Choose this endpoint when you need quick, pay-per-call access to the latest Arbitrum block without managing your own RPC node or API keys. Ideal for lightweight agents that only occasionally need chain head data and want to avoid subscription overhead.

## Known failure modes

- Network or RPC node unavailability returns a 5xx error
- Payment not processed correctly (x402 payment failure) results in 402 response
- Malformed request body returns 400 validation error
- Arbitrum network congestion or downtime may cause delayed or stale responses

## How this service works

High-speed API suite for AI processing, web scraping, and smart data utilities across 57+ blockchain networks. Pay-per-call via x402.

## Output

Returns the latest block data from the Arbitrum network, including block number, block hash, timestamp, and associated transaction metadata as of the moment of the request.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "properties": {},
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/synapse-api-arbitrum-latest-block-bdd24fda/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from synapse-api-brown.vercel.app](https://www.zero.xyz/host/synapse-api-brown.vercel.app/llms.txt)