HTTP Header Checker

http-header-checker.underscoredone.com · x402

Sends a request to a web address you provide and reports back everything the server said in response: the status code, all the response headers, how many times it got redirected, and how long the whole thing took.

Name and description as published by x402 Bazaar

Live

Last successful check: 25 Oct 2026, 21:11 UTC.

answered, last 24 hours: 100%
answered, last 30 days: 100%

How addrbook checks →

Connect

https://http-header-checker.underscoredone.com/check

x402: an unpaid request gets a 402 with the price and pay-to wallet. addrbook never pays.

Who's behind it

Listed by: x402 Bazaarlast seen 25 Oct, 19:50 UTC
Wallets named: 0xe9740820225b3918b4ddd1292c7ca4ca0e2c2f08named by x402 Bazaar
Listed since: 25 Oct 2026, 17:50 UTC

Checks by endpoint

Host	Protocol	State	Last checked (UTC)	Last answered (UTC)	24 hours	30 days	Tools
http-header-checker.underscoredone.com	x402	Live	25 Oct, 21:11	25 Oct, 21:11	100%	100%	—

Also listed as

Other entries that share an endpoint with this one.

http-header-checker.underscoredone.com