CitePulse Literature Brief

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      "description": "Invalid or missing parameter(s). Returned before the payment gate on paid requests, so a malformed call is never charged. JSON body: { error: <what is wrong and how to fix it> } plus usage hints."
    },
    "402": {
      "description": "Payment required — x402 v2 challenge; the accepts array lists scheme, network, and amount. Retry the same request with a PAYMENT-SIGNATURE (v2) or X-PAYMENT (v1) header. Verification is free."
    },
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      "description": "Unexpected server error. If a payment settled without a usable result, contact info@theaslangroupllc.com with the settlement tx hash for a re-run or credit."
    }
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  "example": {
    "question": "does intermittent fasting improve insulin sensitivity in non-diabetic adults?",
    "synthesis": "Multiple randomized trials report modest improvements in insulin sensitivity...",
    "key_citations": [
      {
        "doi": "10.xxxx/yyyy",
        "title": "string",
        "citation": "Smith et al., 2021",
        "relevance": "string"
      }
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}