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x402-gateway: wallet_verify_nostr
x402
x402-gateway: wallet_verify_nostr is a paid API for AI agents from x402.freeq.one, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-15).
Verifies a NIP-98 Nostr HTTP authentication event and returns the signer's public key, with stateful replay protection ensuring each event ID is only accepted once.
Price / call$0.002
Success—
StatusUnknown
How this service works
x402-gateway tool: wallet_verify_nostr — Verify a NIP-98 Nostr HTTP auth event. Returns the signer pubkey. Stateful replay protection: each event id can only be verified once.
Output
Returns the signer's Nostr public key if the NIP-98 event is valid and has not been previously used. Stateful replay protection means each unique event ID is recorded server-side and rejected on reuse, preventing replay attacks.
Example use cases
Authenticate Nostr-signed API request
“I have an incoming POST request from a user who signed it with their Nostr key using NIP-98. Can you verify the auth event, check it hasn't been replayed, and return their public key so I can grant them access?”
Gating content behind Nostr identity
“Before letting someone access this resource, I need to verify their NIP-98 Nostr signature on the HTTP request — can you validate it and extract their pubkey so I can match it against my allowlist?”
Replay attack prevention for Nostr auth
“Someone is trying to authenticate with a NIP-98 event that looks like it might have been used before. Can you verify the event and check whether this event ID has already been seen?”
Technical details
Endpoint
POSThttps://x402.freeq.one/tools/wallet_verify_nostrWhen to prefer
Use this endpoint when you need to authenticate users via their Nostr identity using the NIP-98 HTTP Auth standard, especially when replay protection is critical. Prefer this over a simple signature check when you need server-side stateful enforcement that each auth token is single-use. Ideal for Nostr-native applications, decentralized identity flows, or any system where users authenticate with a Nostr keypair rather than traditional credentials.
Side effects
- Invalid or malformed NIP-98 event structure — returns verification failure
- Replay detected: event ID already used — returns rejection indicating duplicate
- Signature mismatch — public key does not match the event signature
- Missing required fields (type, method, bodyType, body) — returns schema validation error
- Payment failure via x402 protocol — call not executed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Expected u-tag URL (optional; defaults to the request URL) |
| token | string | Base64-encoded NIP-98 event, or 'Nostr <base64>' Authorization header value |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {}
}
}Tags
x402
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