# Synapse API — Unichain Latest Block Lookup

> Synapse API — Unichain Latest Block Lookup 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 Unichain blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/unichain/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-unichain-latest-block-lookup-d221550b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Etkc6i83hF8uL9hg4iy6L

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-unichain-latest-block-lookup-d221550b -d '<json body>'
```

Example prompt: Can you get me the latest block from the Unichain network — I need the block number, hash, and timestamp?

## When to prefer this

Choose this endpoint when you need quick, pay-per-call access to Unichain's latest block without managing your own RPC infrastructure. Prefer it over self-hosted nodes for lightweight or occasional chain-head queries, or when integrating into agent workflows that need current Unichain block state on demand.

## Known failure modes

- Network or RPC node unavailability returns an error response
- Payment not completed (HTTP 402) blocks access
- Unichain node lag may return a slightly stale block
- Malformed request body causes 400/422 validation error
- Rate limiting if too many concurrent requests are made

## 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 structured data about the most recently produced block on the Unichain network, typically including block number, block hash, parent hash, timestamp, gas used, transaction count, and other block header fields.

## 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-unichain-latest-block-lookup-d221550b/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)