# Synapse API — Latest Plasma Block Lookup

> Synapse API — Latest Plasma 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 2026-09-14).

Retrieves the latest block data from the plasma chain across supported blockchain networks via a POST request.

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/plasma/block/latest
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-latest-plasma-block-lookup-2b1ff045
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_cuioyBDhe4tib2JbO6mHU

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-latest-plasma-block-lookup-2b1ff045 -d '<json body>'
```

Example prompt: Can you fetch the latest plasma block data from the Synapse API right now — I need the current block number, hash, and timestamp?

## When to prefer this

Choose this endpoint when you need the latest plasma block data in a pay-per-call model without committing to a subscription, especially if you are operating across multiple blockchain networks and want a single unified API surface. Prefer this over dedicated node RPC calls when you lack direct node access or want simplified multi-chain querying.

## Known failure modes

- Network unreachable or Vercel deployment down — returns 5xx error
- Payment not processed via x402 — returns 402 Payment Required
- Malformed request body — returns 400 Bad Request with schema validation error
- Unsupported network or chain not available — may return empty or error response
- Rate limiting or quota exceeded — returns 429 Too Many Requests

## 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 plasma chain, typically including block number, block hash, parent hash, timestamp, and associated transaction data for the queried network.

## 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-latest-plasma-block-lookup-2b1ff045/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)