# Synapse API — Base Blockchain Latest Block Lookup

> Synapse API — Base Blockchain 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 2026-09-13).

Retrieves the most recent block data from the Base blockchain network

## Facts

- Endpoint: POST https://synapse-api-brown.vercel.app/api/base/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-base-blockchain-latest-block-lookup-3b5320ea
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Dndfyqn_PU_KnNa25FbI4

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-base-blockchain-latest-block-lookup-3b5320ea -d '<json body>'
```

Example prompt: What is the latest block on the Base blockchain right now — give me the block number, hash, and timestamp.

## When to prefer this

Choose this endpoint when you specifically need real-time latest block data from the Base (Coinbase L2) blockchain network, and you are already operating in an x402 micropayment context. Prefer this over general blockchain explorers when you need programmatic, pay-per-call access without API key management, or when integrating Base block data into an automated agent workflow.

## Known failure modes

- Network or node unavailability causing timeout or 5xx error
- Payment failure via x402 protocol resulting in 402 response
- Base network outage or RPC provider downtime
- Malformed request body returning 400 validation error
- 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 data about the most recently confirmed block on the Base blockchain, typically including block number, block hash, parent hash, timestamp, miner/validator address, transaction count, gas used, and other block-level metadata.

## 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-base-blockchain-latest-block-lookup-3b5320ea/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)