Api Endpoint

nostr.halowerk.com

Takes a kind 9735 receipt directly or fetches it from relays by event id, then runs eight named checks and reports each one separately with its reason. The receipt signature and the signature of the zap request enclosed in the description tag are verified per BIP-340. The invoice is decoded and its amount is compared against the amount tag of the zap request, since those two can disagree and only the invoice was payable.

Open interactive test console

Offering

Provider: nostr.halowerk.com
Method: POST
Offering type: Api Endpoint
Transport type: http
Category: Blockchain And Crypto
Delivery: Not provided
Pricing model: Not provided
x402 version: 2

Endpoint context

URL: https://nostr.halowerk.com/zap-receipt-check
MIME type: Not provided
First seen: 2026-10-16T01:58:26.121Z
Last seen: 2026-11-01T15:24:33.269Z
Tags: None supplied

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1: 0.002 USDC
Atomic price: 2000 · Network: eip155:8453 · Asset: USDC · Scheme: exact

Raw x402 terms

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E"
  }
]

Observed health

Status: Healthy
Latest latency: 317 ms
Average latency: 511 ms
HTTP status: 204
Last checked: 2026-11-04T18:59:27.356Z
Reachability: 100% over 11 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "additionalProperties": false,
  "properties": {
    "body": {
      "additionalProperties": false,
      "properties": {
        "event_id": {
          "description": "Event id of the receipt as hex, note or nevent. Fetched from the relays when receipt is not given.",
          "type": "string"
        },
        "receipt": {
          "description": "The complete kind 9735 event. Either this or event_id is required.",
          "type": "object"
        },
        "recipient_lightning_address": {
          "description": "Lightning address of the recipient, for example name@domain. Given, the issuer is compared against the nostrPubkey published there.",
          "type": "string"
        },
        "relays": {
          "description": "wss relay addresses used when fetching by event_id.",
          "items": {
            "type": "string"
          },
          "maxItems": 12,
          "type": "array"
        }
      },
      "type": "object"
    },
    "bodyType": {
      "enum": [
        "json",
        "form-data",
        "text"
      ],
      "type": "string"
    },
    "method": {
      "enum": [
        "POST",
        "PUT",
        "PATCH"
      ],
      "type": "string"
    },
    "type": {
      "const": "http",
      "type": "string"
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "type": "object"
}

Output schema

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "properties": {
    "input": {
      "additionalProperties": false,
      "properties": {
        "body": {
          "additionalProperties": false,
          "properties": {
            "event_id": {
              "description": "Event id of the receipt as hex, note or nevent. Fetched from the relays when receipt is not given.",
              "type": "string"
            },
            "receipt": {
              "description": "The complete kind 9735 event. Either this or event_id is required.",
              "type": "object"
            },
            "recipient_lightning_address": {
              "description": "Lightning address of the recipient, for example name@domain. Given, the issuer is compared against the nostrPubkey published there.",
              "type": "string"
            },
            "relays": {
              "description": "wss relay addresses used when fetching by event_id.",
              "items": {
                "type": "string"
              },
              "maxItems": 12,
              "type": "array"
            }
          },
          "type": "object"
        },
        "bodyType": {
          "enum": [
            "json",
            "form-data",
            "text"
          ],
          "type": "string"
        },
        "method": {
          "enum": [
            "POST",
            "PUT",
            "PATCH"
          ],
          "type": "string"
        },
        "type": {
          "const": "http",
          "type": "string"
        }
      },
      "required": [
        "type",
        "method",
        "bodyType",
        "body"
      ],
      "type": "object"
    }
  },
  "required": [
    "input"
  ],
  "type": "object"
}