# Synapse API — Katana Latest Block

> Synapse API — Katana 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 2026-10-29).

Fetches the latest block data from the Katana blockchain network via the Synapse API gateway

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/katana/block/latest?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-katana-latest-block-663da9cf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rvTVOThQL2n6vJ9zgc2ba

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-katana-latest-block-663da9cf -d '<json body>'
```

Example prompt: What is the latest block on the Katana blockchain right now — give me the block number, hash, and any transactions in it?

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call lookup of the latest Katana block without managing your own RPC node. It is ideal for lightweight agents or dashboards that periodically poll chain state without requiring a dedicated blockchain infrastructure setup.

## Known failure modes

- Network or Vercel cold-start timeout returning a 500 error
- Payment failure or insufficient USDC balance returning a 402 response
- Invalid or malformed request body returning a 400 error
- Katana node unavailable or lagging returning stale or error data
- Rate limiting if too many calls are made in rapid succession

## 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 most recently produced block on the Katana network, typically including the block number, block hash, parent hash, timestamp, and list of transactions or transaction hashes contained in the block.

## 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-katana-latest-block-663da9cf/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)