{"slug":"http-header-checker-5fd84bdd","name":"HTTP Header Checker","summary":"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.","status":"live","indexable":true,"listed_since":"2026-10-25T17:50:26.557271Z","sources":[{"source":"x402_bazaar","external_id":"https://http-header-checker.underscoredone.com/check","owner_address":"0xe9740820225b3918b4ddd1292c7ca4ca0e2c2f08","seen_at":"2026-10-25T19:50:39.031715Z","removed_at":null}],"endpoints":[{"url":"https://http-header-checker.underscoredone.com/check","host":"http-header-checker.underscoredone.com","protocol":"x402","state":"live","last_probe_at":"2026-10-25T21:11:11.561529Z","last_ok_at":"2026-10-25T21:11:11.561529Z","tools_count":null,"tools_changed_at":null,"uptime_24h":1.0,"uptime_30d":1.0}],"also_listed_as":[{"slug":"http-header-checker-underscoredone-com-9afaa16c","name":"http-header-checker.underscoredone.com"}],"notice":"Not affiliated with addrbook — claim or request removal."}