# Synapse API — Avalanche Latest Block

> Synapse API — Avalanche 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 2026-10-16).

Fetches the most recent block data from the Avalanche blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/avalanche/block/latest?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/synapse-api-avalanche-latest-block-7f8fcd83
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LromLbDbeO7xDjNoJ9Q1Y

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-avalanche-latest-block-7f8fcd83 -d '<json body>'
```

Example prompt: What's the latest block on the Avalanche network right now — give me the block number, hash, and timestamp.

## When to prefer this

Choose this endpoint when you need a quick, pay-per-call lookup of the latest Avalanche block without managing your own RPC infrastructure. Ideal for agents that need sporadic chain-tip checks across multiple blockchains without committing to a subscription-based node provider.

## Known failure modes

- Network or RPC node unavailability returns a 5xx error
- Payment not included or invalid results in 402 Payment Required
- Stale data if the upstream Avalanche node is behind the chain tip
- Empty or malformed response body if Avalanche network is experiencing issues

## 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 Avalanche blockchain, including the block number, block hash, timestamp, parent hash, 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-avalanche-latest-block-7f8fcd83/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)