# Synapse API — Citrea Latest Block

> Synapse API — Citrea 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 2026-09-13).

Fetches the most recent block data from the Citrea blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/citrea/block/latest
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-citrea-latest-block-8372d120
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xNowEiQguQXB-mgtvebeG

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-citrea-latest-block-8372d120 -d '<json body>'
```

Example prompt: Can you fetch the latest block from the Citrea blockchain and tell me the current block number, hash, and timestamp?

## When to prefer this

Use this endpoint when you need real-time or near-real-time access to the latest Citrea block data without running your own node. Prefer this over self-hosted solutions when you want a pay-per-call model with no infrastructure overhead. Ideal for lightweight monitoring, block height checks, and chain status verification on the Citrea Bitcoin rollup network.

## Known failure modes

- Network unavailable or Citrea node unreachable — returns HTTP 5xx error
- Payment not provided or insufficient — returns HTTP 402 Payment Required
- Invalid request body format — returns HTTP 400 with validation error
- Rate limit exceeded — returns HTTP 429
- Citrea network experiencing downtime or reorganization — may return stale or error response

## 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 block data for the most recently confirmed block on the Citrea network, including block number, block hash, timestamp, and potentially transaction count and miner/validator details.

## 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-citrea-latest-block-8372d120/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)