JSON Schema Validator API

JSON Schema Validator API. Validate JSON data against a JSON Schema and receive structured valid/invalid results with detailed validation errors. Supports common JSON Schema features including type, required, properties, additionalProperties, enum, const, items, string lengths, patterns, and numeric bounds. Useful for agents, developers, API testing, structured output validation, schema checks, and automation workflows. Paid per call via x402.

Call it in 30 seconds

// npm i x402-fetch viem
import { wrapFetchWithPayment } from "x402-fetch";
import { createWalletClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { base } from "viem/chains";

const account = privateKeyToAccount(process.env.PRIVATE_KEY); // funds USDC on Base
const wallet = createWalletClient({ account, chain: base, transport: http() });
const fetchWithPay = wrapFetchWithPayment(fetch, wallet);

// Pays the $0.001 USDC automatically on the 402, then returns the real response:
const res = await fetchWithPay("https://tools.ipintel.ai/json-schema-validator", { method: "POST" });
console.log(await res.json());

# pip install x402 eth-account httpx
import os, asyncio
from eth_account import Account
from x402.clients.httpx import x402HttpxClient

account = Account.from_key(os.environ["PRIVATE_KEY"])  # funds USDC on Base

async def main():
    async with x402HttpxClient(account=account) as client:
        # x402 handles the 402 -> pay ($0.001 USDC) -> retry automatically
        r = await client.get("https://tools.ipintel.ai/json-schema-validator")
        print((await r.aread()).decode())

asyncio.run(main())

# 1) An unpaid request returns HTTP 402 with the exact payment terms:
curl -i -X POST "https://tools.ipintel.ai/json-schema-validator" \
  -H 'content-type: application/json' \
  -d '{"data": {"name": "Niki"}, "schema": {"properties": {"name": {"type": "string"}}, "required": ["name"], "type": "object"}}'

# 2) Paying + retrying requires an x402 client that can sign the USDC
#    authorization (curl alone cannot). See the JS / Python tabs below.

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