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Base Mainnet Chain Head (Block Height & Base Fee)
x402
Base Mainnet Chain Head (Block Height & Base Fee) is a paid API for AI agents from canary.countersignpay.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).
Returns the current block height and base fee per gas in wei for the 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 with four fields: blockHeight (latest block number on Base mainnet as a decimal string), baseFeePerGas (base fee of that block in wei as a decimal string), network (CAIP-2 chain ID, always 'eip155:8453'), and observedAt (ISO 8601 timestamp of when the chain was read).
Example use cases
Gas fee estimation before transaction
“Before I submit this transaction on Base, can you check the current base fee per gas so I know what to expect to pay?”
Real-time Base chain monitoring
“What block is Base mainnet currently on, and what's the base fee right now? I want to track whether the network is congested.”
DApp synchronization check
“Pull the latest block height and base fee from Base mainnet so I can verify my app is in sync with the chain.”
Technical details
Endpoint
GEThttps://canary.countersignpay.com/v1/base/head?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a live, point-in-time snapshot of Base mainnet chain head data — specifically block height and base fee per gas — without running your own node or RPC connection. Ideal for gas estimation, chain synchronization checks, or any agent workflow that needs current on-chain conditions on Base (eip155:8453) specifically, as opposed to Ethereum mainnet or other L2s.
Side effects
- RPC node temporarily unavailable — endpoint may return 5xx or timeout
- Network congestion may cause slight staleness in observedAt timestamp
- Payment failure via x402 protocol returns 402 with payment details
- Invalid method (non-GET) returns error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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