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Chain Health Check
x402
Chain Health Check 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 live health status for every supported EVM chain, including chain ID, latest block number, and data staleness in seconds.
Price / call$0.005
Success—
StatusUnknown
How this service works
Live health of every supported chain in one call: chain id, block height and how stale the head is. Use it to pick a chain that is actually responding. Via eth_getBlockByNumber.
Output
A JSON array of chain health objects, each containing a boolean `ok` field, the chain identifier in CAIP-2 format (e.g. eip155:8453), the latest block number, and `ageSeconds` indicating how many seconds old the chain head is.
Example use cases
Pick a healthy chain before bridging
“Before I initiate a bridge transfer, check which EVM chains are currently healthy and have fresh block data — I don't want to route to a chain that's lagging.”
Alert on stale chain heads
“Monitor all supported EVM chains and flag any chain whose block head is more than 30 seconds stale so I can alert my team.”
Dashboard for multi-chain status
“Pull the current block height and staleness for every supported chain so I can populate my infrastructure status dashboard.”
Technical details
Endpoint
GEThttps://flat-rate-llm.kikoribera03.workers.dev/v1/evm/chains?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a single call that covers all supported EVM chains simultaneously, rather than querying each chain individually. It is especially useful before submitting transactions or routing logic where you need to confirm a chain is live and up-to-date. Prefer it over per-chain block-height endpoints when chain selection or fallback logic is required.
Side effects
- Upstream RPC node unavailable: chain entry may show ok:false or be omitted
- Rate-limit or payment failure (x402): 402 response requiring payment
- Network timeout from Cloudflare Worker to RPC: stale or missing chain data
- No chains currently supported: empty chains array returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chains": [
{
"ok": true,
"chain": "eip155:8453",
"ageSeconds": 2,
"blockNumber": 51047956
}
]
}
}Tags
x402
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