Read contacts, listings, tenancies and tasks; create a person contact, note or reminder. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the Rex Software connector, then ask in plain words. The AI picks the tools.
For real estate agency teams with authorized Rex API access.
Search contacts and read the selected record before following up.
Search current listings and inspect a selected property.
Find reminders and appointments for a selected period.
Add an internal note linked to selected contacts or properties.
Changes dataCreate a reminder with a due date and optional agency assignee.
Changes dataThe login page asks for your Rex login email, Rex password and Rex region.
Optional: Account id.
Use an agency-invited integration user with only the privileges you need. The integration user counts toward the agency’s paid seats unless Rex grants Verified Integrator status; that status also gates sandbox access. Requested contacts, properties, tenancies, notes and tasks go to your connected AI client and its LLM provider. Credentials are encrypted. We request one-hour session tokens; activity can extend them. Password changes stop new sign-ins but existing tokens may remain valid until vendor expiry/revocation. Disconnect UsefulAPI to stop this connection. Choose the account id if you belong to multiple agencies. Rex integration guide.
Team and Enterprise: an Owner adds the connector for the organization first.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Run this command, then run /mcp in Claude Code to log in:
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"rex-software": {
"url": "https://rex-software.usefulapi.io/mcp"
}
}
} Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"rex-software": {
"type": "http",
"url": "https://rex-software.usefulapi.io/mcp"
}
}
} Run these commands. The second one opens the login page:
Windsurf, Cline, Zed and other MCP clients: add this URL as a remote MCP server (Streamable HTTP). The client then opens the login page in your browser.
Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Rex login email, Rex password and Rex region. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
| Plan | Price | Limit |
|---|---|---|
| Freeper Rex user and region | $0 | 50 tool calls / month |
| Proper Rex user and region | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per Rex user and region | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Rex Software server only. Ask your AI to run rex_upgrade and choose Pro or Pro+, billed monthly or yearly (it returns a Stripe Checkout link). If you already have Pro, ask to change it to Pro+. The change requires your confirmation, keeps your billing interval and charges the price difference for the rest of the period immediately. Cancel any time with rex_cancel_subscription: your paid plan continues to the end of the paid period, with no refund for the current period, and asking to resume the same plan with rex_upgrade before then undoes the cancel. Or write to [email protected].
rex_get_user_profilerex_list_accessible_accountsrex_describe_search_fieldsrex_list_value_listsrex_get_value_listrex_autocomplete_contactsrex_autocomplete_listingsrex_search_contactsrex_search_listingsrex_search_propertiesrex_search_leadsrex_search_appraisalsrex_search_tenanciesrex_search_remindersrex_search_appointmentsrex_search_notesrex_search_dealsrex_search_activitiesrex_search_listing_eventsrex_search_usersrex_search_campaignsrex_get_contactrex_get_listingrex_get_propertyrex_get_leadrex_get_appraisalrex_get_tenancyrex_get_noterex_get_dealrex_get_reminderrex_create_contactrex_create_noterex_create_reminderrex_usage_statusrex_request_featurerex_upgraderex_cancel_subscriptionFind a client. Review available properties. Review upcoming work. Record an agreed client update. Create an agreed follow-up. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by Rex Software. The server calls the Rex Software API with your own Rex Software access, so it sees only the data that your account can see.
Yes. In Claude, add this server's URL as a custom connector. In ChatGPT, add it as a custom MCP server in Plugins. Then log in once. Cursor, VS Code, Claude Code and Codex work too. See the setup steps.
The login page asks for your Rex login email, Rex password and Rex region. See Before you connect for where to find them.
No. Add only the URL. Do not add an Authorization header or an API key to the client config. The server signs you in with OAuth: the login page asks for your Rex login email, Rex password and Rex region. If the config has such a header, remove it: some clients then send that header instead of the login token, and every call fails with 401.
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Rex Software API for you and to derive a private account id for usage metering. usefulapi does not show them on any page or in any reply. To stop all access, remove the connector and change or delete these credentials in Rex Software.
Yes, if you approve it. 3 of the 33 Rex Software tools can create or change data. The other 30 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
The Free plan gives 50 tool calls / month. Pro costs $9/mo or $90/yr, with 10,000 tool calls / month. Pro+ costs $39/mo or $390/yr, with 100,000 tool calls / month. Each subscription covers this Rex Software server only. Cancel any time: your paid plan then runs to the end of the paid period. Run rex_usage_status to see how many calls you used.
Ask the AI to run rex_upgrade and choose Pro or Pro+, billed monthly or yearly: it returns a Stripe Checkout link. If you already have Pro, ask to change it to Pro+. After you confirm, your existing subscription changes in place, keeps its billing interval and charges the price difference for the rest of the period immediately. To cancel, run rex_cancel_subscription. Your paid plan continues to the end of the paid period.
Tell the AI what you wanted to do. It can send the request with rex_request_feature. We store the text with the server name, the type of AI client and the tool you tried, not with your account, and read every request when we plan new tools. You can send up to 5 requests per day.
Any client that supports remote MCP servers (Streamable HTTP) with OAuth login: Claude (web and desktop), Claude Code, ChatGPT, Codex, Cursor, VS Code, Windsurf and others.
This is a Model Context Protocol endpoint — meant to be connected from an AI client, not opened in a browser. An invalid_token response at the URL is the auth gate working as designed; clients authenticate automatically.
Need a tool this server does not have, or a connection to another system? We build custom integrations and MCP servers.