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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 2026-09-14).
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
60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.
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
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/evm/chainsWhen 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
Output
Schema · Response
{
"type": "json",
"example": {
"chains": [
{
"ok": true,
"chain": "eip155:8453",
"ageSeconds": 2,
"blockNumber": 51047956
}
]
}
}Tags
x402
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