X402 Checker

Check any URL — or a bulk list — to instantly discover whether it supports the X402 HTTP payment protocol. For every X402-enabled endpoint, the actor extracts the price, currency, network, payment address, and full structured payment options.

What is X402?

x402 is an open standard that brings native payments to the internet. It fills the gap the web was built without — making value exchange between clients and servers as natural as any other request. The result: scalable, agentic payment economies that work for everyone.

What does this app do?

• Sends a request to each URL
• Detects a 402 Payment Required response
• Parses all X402-related headers and JSON body: payment-required, x-payment-required, www-authenticate, x402-price, x402-currency, x402-network, x402-endpoint, and more
• Handles both the modern accepts / paymentRequirements array format and legacy single-header formats
• Returns one structured dataset row per URL: payment options, networks, amounts, tokens, pay-to addresses, and error info

Demo / Try it Out

• Register a free Apify account and try it out at https://apify.com/onescales/x402-checker?fpr=s9de8

Supported Networks & Coins

• Stablecoins: USDC, USDT, DAI, EURC, PYUSD, USDG
• EVM mainnets: Ethereum, Base, Polygon, Optimism, Arbitrum, Avalanche, BSC, X Layer, Plasma
• EVM testnets: Ethereum Sepolia, Base Sepolia, OP Sepolia, Arbitrum Sepolia, Polygon Amoy, Avalanche Fuji, X Layer Sepolia
• Solana: Mainnet and Devnet
• Unknown networks and tokens are still reported with their raw values so you never lose data
• Need a network or coin that isn't listed? Contact us and we'll add it.

Use cases

• Developer research — Discover which URLs in the x402 ecosystem require payment and at what price
• Bulk auditing — Check hundreds of endpoints at once to build a directory or monitor pricing changes
• Integration testing — Verify your own x402-enabled service is returning the correct headers
• Competitive intelligence — Track x402 adoption across public APIs

Input

Field	Type	Required	Description
urls	array	Yes	One or more URLs to check

Example input:

{
    "urls": [
        { "url": "https://x402.org/protected" },
        { "url": "https://api.example.com/data" }
    ]
}

Output

Each URL produces one dataset row:

Field	Type	Description
url	string	The checked URL
supportsX402	boolean	true if the server returned HTTP 402
statusCode	number	Actual HTTP status code returned
x402Version	string	X402 protocol version from the payload
description	string	Resource description from the payload
acceptsCount	number	Number of payment options available
acceptNetworks	string[]	Blockchain networks for each option (e.g. Base, Ethereum)
acceptAmounts	string[]	Payment amounts for each option (human-readable, e.g. 0.001)
acceptSymbols	string[]	Token symbols for each option (e.g. USDC)
acceptPayTos	string[]	Payment recipient addresses for each option
accepts	object[]	Full structured payment options array
rawHeaders	object	Raw X402-related response headers (when present)
error	string	Error message if the request failed
checkedAt	string	ISO 8601 timestamp

Example output item (X402-enabled URL):

{
    "url": "https://x402.org/protected",
    "supportsX402": true,
    "statusCode": 402,
    "x402Version": "1",
    "description": "Protected resource",
    "acceptsCount": 1,
    "acceptNetworks": ["Base"],
    "acceptAmounts": ["0.001"],
    "acceptSymbols": ["USDC"],
    "acceptPayTos": ["0xABC123..."],
    "accepts": [
        {
            "scheme": "exact",
            "network": "Base",
            "amount": "0.001",
            "symbol": "USDC",
            "payTo": "0xABC123..."
        }
    ],
    "checkedAt": "2025-04-16T12:00:00.000Z"
}

Example output item (non-X402 URL):

{
    "url": "https://api.example.com/data",
    "supportsX402": false,
    "statusCode": 200,
    "checkedAt": "2025-04-16T12:00:00.000Z"
}

Open Source

x402checker is made by _done (https://underscoredone.com) and is open source and freely available for personal and commercial use.

Repository: github.com/onescales/x402checker

This project is licensed under the MIT License with Attribution — you are free to use, modify, and distribute this software, provided that visible credit to One Scales and a link to https://onescales.com/ is included in any derivative work

Support

Contact Support — feature requests and custom integrations welcome.

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