Tool detail

Latest Block Number

Returns the current chain tip (latest block height) via eth_blockNumber for one of six supported EVM chains.

Categories: Onchain data

Use when

check the latest block number on Base or another EVM chain
poll chain tip freshness for a settlement or indexing job

Not for

not a full block explorer — block height only, no transactions or timestamps
not for non-EVM chains — Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis only

Inputs

Admitted input schema

{
  "type": "object",
  "properties": {
    "chain": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "base|ethereum|optimism|arbitrum|polygon|gnosis (default base)"
    }
  },
  "required": [],
  "additionalProperties": false
}

Endpoint

Method: GET
URL: https://store.agentexchange.work/chain/block-number

Payment

Protocol: x402
Listed price: 0.001 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: GET https://store.agentexchange.work/chain/block-number
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z