# Base Latest Block Height

> Base Latest Block Height is a paid API for AI agents from appearing-clinics-show-wrote.trycloudflare.com, paid per call via x402, price unknown, status down (last checked 2026-09-15).

Returns the current canonical block number, timestamp, head age, and source provenance for the Base blockchain network.

## Facts

- Endpoint: GET https://appearing-clinics-show-wrote.trycloudflare.com/base-block-height-sample
- Price: price unknown
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-latest-block-height-63ed691c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_e29pTkvrGO0HzOYAmfVJE

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 base-latest-block-height-63ed691c
```

Example prompt: What's the current block height on the Base blockchain right now, including the timestamp and how old the chain head is?

## When to prefer this

Choose this endpoint when you need a quick, cheap ($0.0009) read-only lookup of the current Base chain tip with provenance metadata. Prefer it over Ethereum mainnet block height endpoints when your workflow is Base-specific. Useful for timestamping, sync verification, or chain monitoring without requiring a full RPC node setup.

## Known failure modes

- RPC provider unavailable — returns an error or timeout if Base RPC nodes are unreachable
- Stale head age — during network congestion, head age may appear elevated but the response still succeeds
- Cloudflare tunnel disruption — the trycloudflare.com proxy may be temporarily unavailable, returning a 5xx error
- Rate limiting — excessive requests may be throttled by the underlying RPC batch endpoint

## How this service works

Free Base latest-block-height sample. The paid $0.0009 service returns the canonical decimal Base block number, timestamp, head age, and source provenance from a bounded read-only RPC batch.

## Output

A JSON object containing the canonical decimal Base block number, the block timestamp, the age of the chain head (how long since last block), and source provenance metadata indicating which RPC endpoint provided the data.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-latest-block-height-63ed691c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from appearing-clinics-show-wrote.trycloudflare.com](https://www.zero.xyz/host/appearing-clinics-show-wrote.trycloudflare.com/llms.txt)