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PreFlight Chain Health Check
x402
PreFlight Chain Health Check is a paid API for AI agents from meryol-agenticmarket-x402.hf.space, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-10).
Returns RPC health status, block head age, latency, and sync score for a specified EVM chain before signing a transaction
Price / call$0.001
Success—
StatusUnknown
How this service works
Pre-trade & pre-sign checks for autonomous agents: everything an agent verifies BEFORE signing a transaction — token due diligence, calldata red-flag decoding, oracle freshness, holder concentration, bridge routing with executable calldata, cross-venue perp funding, gas and price sanity checks. EVM chains: Ethereum, Base, Arbitrum, Optimism.
Output
A JSON object containing a list of RPC endpoints with their individual latency, block number, block timestamp, and error status; plus aggregate metrics including chain name, head age in seconds, overall health score (0-100), max lag in blocks, total and healthy RPC counts, and the median block number.
Example use cases
Example prompt
“Before I sign this transaction on Base, check if the RPC nodes are healthy and current — I want to see the block head age, latency, and overall health score so I know the chain isn't lagging.”
Technical details
Endpoint
GEThttps://meryol-agenticmarket-x402.hf.space/chain/health/%7Bchain%7DWhen to prefer
Use this endpoint when an autonomous agent needs to confirm that the target EVM chain (Ethereum, Base, Arbitrum, Optimism) has live, in-sync RPC nodes before submitting or signing a transaction. Prefer this over generic uptime monitors when you need block-level freshness metrics (head_age_s, max_lag_blocks) and per-RPC latency as part of a pre-trade or pre-sign safety checklist.
Side effects
- Unknown or unsupported chain name returns 404 or error
- RPC endpoints all down returns healthy_rpc_count=0 and low score
- Chain parameter missing causes 422 validation error
- Temporary network issues may return partial RPC results
- HuggingFace Space cold start may cause initial timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"rpcs": [
{
"rpc": "https://mainnet.base.org",
"error": null,
"block_ts": 1715000000,
"latency_ms": 120,
"block_number": 18234567
}
],
"chain": "base",
"notes": [],
"head_age_s": 2,
"score_0_100": 100,
"max_lag_blocks": 0,
"total_rpc_count": 3,
"healthy_rpc_count": 3,
"median_block_number": 18234567
}
}Tags
x402
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