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Agent402 Block Number Lookup
x402
Agent402 Block Number Lookup is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the current block number for a specified EVM-compatible blockchain network (defaulting to Base)
Price / call$0.001
Success—
StatusUnknown
How this service works
The latest block number on Ethereum, Base, Polygon, Arbitrum, or Optimism. The cheapest possible on-chain read - the hello world of paid chain access. Keyless multi-endpoint failover. ?network=base
Output
Returns a JSON object containing the current block number as a decimal integer (blockNumber), its hexadecimal representation (hex), and the network name (network). Example: {"hex":"0x19bfcc0","network":"base","blockNumber":27000000}.
Example use cases
Confirm transaction finality on Base
“Can you check the current block number on Base so I can confirm my transaction from block 27000000 has enough confirmations?”
Monitor Ethereum block height
“What block is Ethereum mainnet on right now? I need to track how many blocks have passed in the last hour.”
Sync onchain state across Polygon
“Fetch me the latest block number on Polygon — I need to make sure my indexer isn't falling behind.”
Technical details
Endpoint
GEThttps://agent402.tools/api/block-numberWhen to prefer
Choose this endpoint when you need a quick, cheap ($0.001), no-signup way to get the current block number on Base or other major EVM chains. Ideal for agents that need onchain timing context, transaction finality checks, or block-indexed queries without setting up a full RPC provider connection. Supports Base, Ethereum, Polygon, Arbitrum, and Optimism via x402 micropayment — no API key required.
Side effects
- Unsupported network name returns an error — only ethereum, base, polygon, arbitrum, and optimism are valid
- Payment failure (insufficient USDC balance or unsupported chain) results in a 402 response before data is returned
- Network RPC downtime may cause delayed or failed responses
- Malformed query parameter (e.g. misspelled network name) defaults to base or returns an error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"hex": "0x19bfcc0",
"network": "base",
"blockNumber": 27000000
}
}Tags
x402
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