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EVM Block Height
x402
EVM Block Height is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-27).
Returns the latest block number, timestamp, and staleness (age in seconds) for any supported EVM chain, useful for checking node sync status.
Price / call$0.005
Success—
StatusUnknown
How this service works
Latest block height and timestamp of any supported chain, plus how old the chain head is in seconds. Tells an agent whether a node is in sync. Via eth_getBlockByNumber.
Output
A JSON object containing the latest block number (blockNumber), the Unix timestamp of that block (timestamp), and how many seconds ago that block was produced (ageSeconds), allowing an agent to determine whether the chain is actively producing blocks and the node is in sync.
Example use cases
Node sync health check
“Check if the Base node is in sync — give me the latest block number and tell me how many seconds old the chain head is.”
Smart contract deployment readiness
“Before I deploy my contract, can you confirm the Polygon chain head is current — what's the latest block number and how fresh is it?”
Automated chain monitoring alert
“Every few minutes, grab the latest block height and age on Arbitrum and let me know if the chain head goes stale by more than 30 seconds.”
Technical details
Endpoint
GEThttps://flat-rate-llm.kikoribera03.workers.dev/v1/evm/block?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, cheap ($0.001) single-chain block height and freshness check — ideal before submitting transactions, monitoring node health, or confirming a chain is live. Prefer the sibling 'Chain health check' endpoint if you need to check multiple chains at once. This endpoint is purpose-built for sync status checks via eth_getBlockByNumber and returns a minimal, clean payload.
Side effects
- Unsupported chain returns an error or empty response
- Network timeout if the upstream RPC node is unresponsive
- Payment failure (402) if USDC balance is insufficient
- Stale data if upstream node itself is out of sync — ageSeconds will be large but call still succeeds
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | base | ethereum | polygon | arbitrum | optimism. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| timestamp | number | |
| ageSeconds | number | |
| blockNumber | number |
Tags
x402
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