the402 endpoint detail

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nostr.halowerk.com zap-radar

https://nostr.halowerk.com/zap-radar

answers 402

Collects kind 9735 zap receipts addressed to one public key over up to twelve relays, merges them by event id and reports who sent how much over the requested window. Every amount comes from decoding the BOLT-11 invoice carried in the receipt, not from the amount tag of the zap request, because the two can disagree and only the invoice was payable.

We sent a real POST request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.004
Network
base
Pay to
0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
POST
Response latency
664 ms
Payment options
1 usable of 1
Last checked
2026-09-06T01:22:56.356Z (23d ago)
Category
other

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fnostr.halowerk.com%2Fzap-radar"