generated: '2026-08-13' method: probed source: Live HTTPS probes on 2026-08-13 against the Sell API host and the Zendesk web/docs hosts. note: >- The API host api.getbase.com answers every /.well-known/* path with its normal JSON 404 envelope ({"errors":[{"error":{"code":"not_found"...}}]}) — a real 404, not an SPA shell. developer.zendesk.com returns a 404 HTML shell for every path. Only www.zendesk.com serves a real document: a PGP-signed RFC 9116 security.txt. www.zendesk.com rejects default curl user agents with 403; the 200s below were observed with a browser user agent. hosts: - host: https://api.getbase.com documents: - path: /.well-known/security.txt status: 404 - path: /.well-known/openid-configuration status: 404 - path: /.well-known/oauth-authorization-server status: 404 - path: /.well-known/api-catalog status: 404 - path: /.well-known/ai-plugin.json status: 404 - path: /.well-known/agent-card.json status: 404 - path: /.well-known/agent.json status: 404 - path: /llms.txt status: 404 - host: https://www.zendesk.com documents: - path: /.well-known/security.txt status: 200 content_type: text/plain file: zendesk-sell-security.txt note: RFC 9116, PGP-signed, Expires 2027-04-16. - path: /llms.txt status: 200 content_type: text/plain bytes: 741350 note: >- Real 200 — a corporate zendesk.com marketing/content index covering the whole Zendesk product line, not a Sell developer surface. Not saved verbatim here; see llms/zendesk-sell-llms.txt for the Sell-scoped file generated from this repo. - path: /.well-known/agent-card.json status: 404 - path: /.well-known/agent.json status: 404 - path: /.well-known/api-catalog status: 404 - host: https://developer.zendesk.com documents: - path: /.well-known/security.txt status: 404 - path: /.well-known/openid-configuration status: 404 - path: /.well-known/oauth-authorization-server status: 404 - path: /.well-known/api-catalog status: 404 - path: /.well-known/ai-plugin.json status: 404 - path: /.well-known/agent-card.json status: 404 - path: /.well-known/agent.json status: 404 - path: /llms.txt status: 404 documents_found: 1