x402 Detector

Name: x402 Detector
Author: srvzty

Detects x402 payment protocol endpoints while you browse. Green when found, red when not.

As of June 2026, x402 Detector has 2 users in the Developer Tools category.

srvzty Developer Tools

Chrome Web Store ↗.crx

Users0%

Rating0%

—

— reviews

Reviews0%

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Version

1.0.1

Manifest V3

History

6 snapshots

Tracking since Apr 2, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 2, 2026	—	—	—	1.0.1
Apr 17, 2026	1	—	—	1.0.1
Apr 27, 2026	—	—	—	1.0.1
May 10, 2026	—	—	—	1.0.1
May 16, 2026	1	—	—	1.0.1
Jun 4, 2026	—	—	—	1.0.1
Now	2	—	—	1.0.1

Permissions & access

Permissions: activeTabstoragewebRequestnotifications
Host access: <all_urls>

Screenshots

About

x402 Detector passively checks every site you visit for x402 payment protocol support — the open HTTP payment standard pioneered by Coinbase.

HOW IT WORKS
• Visit any website — the extension automatically probes for x402 endpoints
• Green "x402" badge = site supports x402 crypto payments
• Red "OFF" badge = no x402 detected
• Click the icon to see payment details (network, price, endpoint)

FEATURES
• Detects HTTP 402 responses with x-payment-required headers
• Discovers endpoints via /.well-known/x402.json
• Stores all discovered x402 sites locally
• One-click submit to a2alist.ai (the x402 agent directory)
• Export discovered sites as JSON
• Browse 61+ verified x402 agents from the popup

PRIVACY
• No data is collected or sent automatically
• Submission to a2alist.ai is user-initiated only
• All discovered sites stored locally in your browser
• No analytics, no tracking, no accounts required

BUILT FOR
• Developers integrating x402 payments
• Crypto enthusiasts exploring the x402 ecosystem
• Anyone curious which sites accept crypto via HTTP 402

Part of the x402-validate toolkit:
https://github.com/suryast/x402-check

Release notes: 
https://www.npmjs.com/package/x402-validate