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verify_answer_receipt

Read-onlyIdempotent

FREE. Verify an answer receipt (kind answer_receipt) with the Ed25519 public key only. Pass the receipt object or its canonical JSON, signature_value when the signature is not inside the receipt, and public_key_pem to verify offline. If public_key_pem is omitted, the tool may GET signature.public_key (/certified/public-key) and read public_key_pem. Never send a private key. A valid signature shows this service issued that exact receipt. It does not turn the receipt into a series certified extract (GET /v1/certified/{country}/{series} at $0.25, not an MCP tool) and it is not legal advice. Same key and canonical-JSON rule as /certified/public-key.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
receiptYesAnswer receipt object (signature may be nested) or the canonical JSON of that object. A canonical JSON string of the signed body (signature omitted) is accepted when signature_value is also passed.
public_key_pemNoSPKI public key PEM from GET /certified/public-key (field public_key_pem). Required for offline verify. A private key PEM is refused.
public_key_urlNoOptional GET /certified/public-key URL used only when public_key_pem is omitted. Ignored when the PEM is present.
signature_valueNoBase64 Ed25519 signature. Required when the receipt object or JSON string does not already include signature.value. Overrides a nested signature when both are sent.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
okNo
whyNo
errorNoPresent on a free refusal or error; no charge
no_chargeNo
price_usdNo
disclaimerNo
how_to_payNo
bind_seriesNo
explanationNo
x_next_bindNo
http_endpointNo
payment_requiredNotrue when the call needs payment; how_to_pay explains x402 or card

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / (root)
      Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": {},
+  "description": "Receipt verification result",
+  "properties": {
+    "bind_series": {},
+    "disclaimer": {},
+    "error": {
+      "description": "Present on a free refusal or error; no charge"
+    },
+    "explanation": {},
+    "how_to_pay": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "http_endpoint": {
+      "type": "string"
+    },
+    "no_charge": {
+      "type": "boolean"
+    },
+    "ok": {
+      "type": "boolean"
+    },
+    "payment_required": {
+      "description": "true when the call needs payment; how_to_pay explains x402 or card",
+      "type": "boolean"
+    },
+    "price_usd": {
+      "type": "number"
+    },
+    "why": {
+      "type": "string"
+    },
+    "x_next_bind": {}
+  },
+  "type": "object"
+}
  2. Added

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