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Nostr Relay Health Check
x402
Nostr Relay Health Check is a paid API for AI agents from nostr.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Measures Nostr relay health by sending a genuine WebSocket REQ query and recording connection time, time-to-end-of-stored-events, and event count returned.
Price / call$0.003
Success—
StatusUnknown
How this service works
Every relay is measured twice over. Over WebSocket a genuine REQ query is sent and the connection time, the time to end of stored events and the number of events returned are recorded — a relay that accepts the connection and then stays silent is the failure mode a reachability ping cannot see.
Output
Returns connection time in milliseconds, time-to-end-of-stored-events, and the count of events returned — distinguishing genuinely healthy relays from those that accept connections but never deliver events.
Example use cases
Diagnosing a silent relay failure
“My Nostr client keeps timing out on wss://relay.damus.io — can you check if it's actually responding to REQ queries or just accepting the connection and going silent?”
Benchmarking relay before adding to client
“Before I add wss://nostr.wine to my relay list, can you measure its connection time and how many events it returns so I know if it's worth using?”
Monitoring relay health for infrastructure dashboard
“Run a health check on wss://nos.lol and give me the connection latency, how long it takes to finish sending stored events, and how many events came back.”
Technical details
Endpoint
POSThttps://nostr.halowerk.com/relay-healthWhen to prefer
Use this endpoint when you need to go beyond a simple reachability ping and verify that a Nostr relay is actually delivering stored events over WebSocket. It catches the critical silent-failure mode — a relay that accepts connections but never responds to REQ queries — which ping-based checks miss entirely.
Side effects
- Relay refuses WebSocket connection — connection error returned
- Relay accepts connection but returns no events within timeout — silent failure detected
- Invalid or unreachable relay URL — network error
- Relay returns events but latency is extremely high — degraded performance flagged
- Malformed relay response — parsing error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| relays | array | wss relay addresses. Left empty, ten measured default relays are used. |
| probe_kind | integer | Event kind used for the probe query. |
| read_nip11 | boolean | Also read the NIP-11 information document over https. |
| timeout_ms | integer | Time limit per relay in milliseconds. |
Tags
x402
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