# Postandshare Chain Block Lookup

> Postandshare Chain Block Lookup is a paid API for AI agents from api.postandshare.net, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-28).

Fetches block data (by number or 'latest') from a specified EVM-compatible blockchain network (Base, Ethereum, Arbitrum, or Polygon) via a pay-per-call x402 endpoint.

## Facts

- Endpoint: GET https://api.postandshare.net/v1/chain/block?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/postandshare-chain-block-lookup-3c4b55d8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_JrdcdGX40chMhMn05XTKA

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 postandshare-chain-block-lookup-3c4b55d8
```

Example prompt: What does the latest block on Base look like right now? Pull the block data for me.

## When to prefer this

Choose this endpoint when you need lightweight, pay-per-call on-chain block reads across Base, Ethereum, Arbitrum, or Polygon without managing your own RPC infrastructure. Ideal for AI agents that need occasional block lookups billed per-use via USDC micropayment rather than subscribing to a node provider.

## Known failure modes

- Invalid or non-existent block number returns an error or empty result
- Unsupported network value (not base/ethereum/arbitrum/polygon) returns a validation error
- Network congestion or RPC downtime may cause timeouts
- Payment failure via x402 protocol returns HTTP 402

## How this service works

x402 pay-per-call data endpoints for AI agents: multi-chain reads (Base, Ethereum, Arbitrum, Polygon) and Nigerian reference data. Format/reference validation only — no personal data, no identity-database lookup.

## Output

Returns structured block data for the requested block on the specified EVM chain, including block number, hash, timestamp, transaction count or list, and other standard block fields as provided by the chain's RPC.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "number": {
   "type": "string",
   "description": "Block number, or \"latest\" (default)"
  },
  "network": {
   "enum": [
    "base",
    "ethereum",
    "arbitrum",
    "polygon"
   ],
   "type": "string",
   "description": "Chain to read (default base)"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/postandshare-chain-block-lookup-3c4b55d8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.postandshare.net](https://www.zero.xyz/host/api.postandshare.net/llms.txt)