A stable schema contract for every LLM.

curl -X POST https://schemashield.ai/v1/shield \
  -H "Authorization: Bearer <YOUR_API_KEY>" \
  -H "Content-Type: application/json" \
  -d '{
    "provider":"openai",
    "model": "gpt-4.1-mini",
    "prompt":"Extract a product {name, priceUSD:number}. Text: iPhone 15 costs $799.",
    "schema":{
      "type":"object",
      "properties":{"name":{"type":"string"},"priceUSD":{"type":"number"}},
      "required":["name","priceUSD"],
      "additionalProperties":false
    }
  }'

import fetch from "node-fetch";
const res = await fetch("https://schemashield.ai/v1/shield", {
  method: "POST",
  headers: { "Content-Type": "application/json", "Authorization": "Bearer <YOUR_API_KEY>" },
  body: JSON.stringify({
    provider: "openai",
    model: "gpt-4.1-mini",
    prompt: "Extract a product {name, priceUSD:number}. Text: iPhone 15 costs $799.",
    schema: {
      type: "object",
      properties: { name: {type: "string"}, priceUSD: {type: "number"} },
      required: ["name","priceUSD"], additionalProperties: false
    }
  })
});
const out = await res.json();
if (!out.ok) { throw new Error(out.diff || out.error); }
console.log(out.data); // { name: "iPhone 15", priceUSD: 799 }

import requests, json
resp = requests.post("https://schemashield.ai/v1/shield",
  headers={"Authorization":"Bearer <YOUR_API_KEY>"},
  json={
    "provider":"openai","model":"gpt-4.1-mini",
    "prompt":"Extract a product {name, priceUSD:number}. Text: iPhone 15 costs $799.",
    "schema":{
      "type":"object",
      "properties":{"name":{"type":"string"},"priceUSD":{"type":"number"}},
      "required":["name","priceUSD"],"additionalProperties":False
    }
  })
out = resp.json()
if not out.get("ok"): raise SystemExit(out.get("diff") or out.get("error"))
print(out["data"])

Response: { ok: true, data } or { ok: false, error, diff }.