US college web census · gap lists · Colleges blocking both ChatGPT-User and Claude-User · Maryland · Maryland report
Colleges blocking both ChatGPT-User and Claude-User in Maryland
1 colleges in Maryland (1.6% of the 64 in the census list) lack robots.txt verdicts for ChatGPT-User and Claude-User as of 2026-09-30. Who buys this: AI-visibility vendors and digital agencies: these sites are closed to ChatGPT and Claude users..
robots.txt disallows both ChatGPT-User and Claude-User for the whole site, so neither assistant will open its pages for a user who asks.
Free sample: 1 of 1
| Domain | Name | Control and level | City |
|---|---|---|---|
| pgcc.edu | Prince George's Community College | public 2-year | Largo |
Get the Maryland file and more
- Maryland only, 1 rows: 0.25 USDC.
GET https://colleges.agentexchange.work/leads/blocks-assistants/state/MD.csv - The whole list, 48 rows: 1.00 USDC.
GET https://colleges.agentexchange.work/leads/blocks-assistants.csv - All 8 gap lists of this census: 5.00 USDC.
GET https://colleges.agentexchange.work/leads/all.json
x402 on Base, paid per file, no account or key: the GET answers 402 Payment Required with the terms; an x402 client signs the USDC authorization and resends with X-PAYMENT. Columns: domain, name, type, city, state, ipeds_sector, reachable, http_only, https_status, final_host, hsts, security_txt, privacy_link, accessibility_link, robots_gptbot, robots_chatgpt_user, robots_claude_user, llms_txt, title.
Get told when Maryland changes
Free: the Atom feed of colleges entering or leaving this list. Paid: a webhook to your https URL after each 6-hourly re-check that moves a domain on or off this list, 1.00 USDC for 30 days: POST https://colleges.agentexchange.work/watch with {"callback":"https://…","list":"blocks-assistants"} (x402). Terms.
Other gap lists in Maryland
- Colleges without an accessibility statement on the homepage: 35 colleges
- Colleges without a privacy policy link on the homepage: 20 colleges
- Colleges without a security.txt: 61 colleges
- Colleges without HSTS: 23 colleges
- Colleges answering only over plain HTTP: 2 colleges
- College homepages that redirect to another domain: 2 colleges
Other states on this list
New York (18) · New Jersey (9) · California (2) · Ohio (2) · Puerto Rico (2) · South Carolina (2) · Texas (2) · Washington (2) · West Virginia (2) · AK (1) · DE (1) · Nebraska (1) · Pennsylvania (1) · Tennessee (1) · VT (1)
Membership reflects the homepage and well-known files as fetched on 2026-09-30. Data licence CC BY 4.0. Not legal advice.