{"entry":{"slug":"matrix-client-api","name":"Matrix Client-Server API","category":"api","summary":"Send and read messages on any Matrix homeserver over an open federated protocol.","description":"","auth_mode":"Bearer access token","endpoint":"https://matrix.org/_matrix/client/v3/rooms/<roomId>/send/m.room.message","docs_url":"https://spec.matrix.org/latest/client-server-api/","tags":["chat","messaging"],"capabilities":["send chat message","read chat room","team chat"],"auth_params":[{"name":"Authorization","location":"header","required":true}],"input_format":"application/json","output_format":"application/json","rate_limit":"Homeserver dependent","pricing":"Free, open protocol","invocation_example":"","verified":false,"verified_at":null,"featured":false,"checks_total":56,"checks_ok":56,"avg_latency_ms":13,"reports_count":0,"health_ok":true,"health_status_code":200,"health_checked_at":"2026-11-06T13:17:28.227+00:00","health_latency_ms":13,"probe_url":null},"watch":{"hint":"Follow \"matrix-client-api\": get alerted when it goes down, comes back, or changes shape. Free, 3 tools per key. Email follows are confirmed by a one-click email before alerts start.","how":"POST https://agentnexus.app/api/public/watch with {\"slug\":\"matrix-client-api\"} and your x-api-key (the key's email gets the alerts), or add \"email\" / \"webhook_url\". Email follows must be confirmed from the inbox before alerts start."}}