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Base Mainnet Chain Head Info
x402
Base Mainnet Chain Head Info is a paid API for AI agents from canary-production-f6b6.up.railway.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-27).
Returns the current block height and base fee per gas on Base mainnet, read live from the chain at request time
Price / call$0.01
Success—
StatusUnknown
How this service works
Current Base mainnet block height and base fee per gas in wei, read from the chain at request time
Output
Returns a JSON object containing the latest block number on Base mainnet as a decimal string, the base fee per gas of that block in wei as a decimal string, the CAIP-2 chain ID (eip155:8453), and an ISO 8601 timestamp indicating when the chain was read.
Example use cases
Gas fee check before transaction
“What's the current base fee per gas on Base mainnet? I want to know if gas is cheap before I submit my transaction.”
Block height monitoring for confirmation
“Can you grab the latest block number on Base mainnet so I can check how many confirmations my transaction has?”
Real-time chain state for dashboard
“Fetch the current Base mainnet block height and base fee in wei so I can update my on-chain analytics dashboard.”
Technical details
Endpoint
GEThttps://canary-production-f6b6.up.railway.app/v1/base/head?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a live, single-request snapshot of Base mainnet's current block height and base fee per gas without running your own node or managing an RPC provider. Ideal for agents that need real-time gas estimation, transaction confirmation checking, or on-chain state monitoring on Base L2 specifically. Prefer this over general Ethereum RPC calls when targeting Base mainnet (eip155:8453) and wanting a simple, paid-per-call REST interface.
Side effects
- Chain read timeout if Base RPC is slow or unavailable, resulting in an error response
- Stale data risk if the chain node is behind — observedAt timestamp should be checked
- Payment failure if x402 payment header is missing or insufficient (HTTP 402)
- Network connectivity issues may result in a 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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