At One Scales, we've been closely following the rise of X402 — the open standard that brings native payment support to the web. To make it easier for developers and teams to explore and work with X402, we built and released the X402 Checker, a free, open source tool available on Apify.
What is X402?
X402 is built on the long-dormant HTTP 402 "Payment Required" status code. It gives APIs and URLs a standardized way to declare their payment requirements directly in their response headers — no custom integrations, no proprietary payment walls. Just an open, interoperable standard for monetizing access to any URL or API endpoint.
As X402 adoption grows, teams need a fast, reliable way to discover and inspect which URLs are X402-enabled. That's exactly what we built.
Introducing X402 Checker
X402 Checker lets you submit any URL — or thousands of them — and instantly see whether it supports X402. If it does, you'll get the full picture:
- X402 version in use
- Payment description
- Supported blockchain networks
- Required token and payment amount
- Pay-to wallet addresses
- Full raw 402 HTTP header data
No guesswork, no manual header inspection. Just clear, structured results in seconds.
Built for Bulk
One of the core design goals was scale. Whether you're checking a handful of URLs or running a sweep of 10,000 endpoints, X402 Checker handles it. Input URLs one by one, or paste a bulk list and let it run.
Flexible Output & Easy Integration
Results can be accessed in multiple ways depending on your workflow:
- Browse results directly in the Apify UI
- Connect programmatically via API or MCP
- Export to JSON, CSV, Excel, or Google Sheets for downstream analysis
This makes it straightforward to integrate X402 discovery into existing pipelines, research workflows, or product development processes.
Open Source
X402 Checker is fully open source. We believe in building in the open, and we welcome contributions, feedback, and forks. You can inspect the source code directly on Apify or visit our GitHub repository.
Get Started in Minutes
Getting started is free and takes just a few steps:
- Register a free account at apify.com
- Open the X402 Checker app and click "Try for Free"
- Add your URLs, hit Start, and get results in seconds
What's Next
We're excited about where X402 is headed and the role tools like X402 Checker can play in accelerating adoption. If you're building on X402, researching the ecosystem, or just curious — we'd love to hear from you.
Have questions, suggestions, or want to contribute? Reach out or open an issue on GitHub. We're here to help.
Watch the intro video: https://www.youtube.com/watch?v=rdPnwRh9a2s
Try the app on Apify: https://apify.com/onescales/x402-checker?fpr=s9de8
GitHub: https://github.com/onescales/x402checker