Send and read OpenPhone messages, calls, contacts and phone numbers. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
Turn on the OpenPhone connector, then ask in plain words. The AI picks the tools.
For small business owners and sales or support teams who talk to customers with OpenPhone.
The AI lists conversations for a number and reads the messages in one thread with text, direction, status and time. It sums up where the talk stands.
The AI lists calls with a participant and reads one call's AI summary with next steps, or its transcript. You get the result of a call without listening.
The AI lists contacts and reads one with name, company, role, emails, phone numbers and custom fields.
The AI sends an SMS from one of your OpenPhone numbers to up to 10 recipients. This sends a real text and may cost carrier fees.
Changes dataThe AI creates a contact with emails and phone numbers, and can fill custom fields that exist in the workspace.
Changes dataThe login page asks for your OpenPhone API key.
Create one in OpenPhone → Settings → API. Your token is used only to call the API on your behalf and to derive a private account id; it is never shown to anyone.
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": {
"openphone": {
"url": "https://openphone.usefulapi.io/mcp"
}
}
} Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"openphone": {
"type": "http",
"url": "https://openphone.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 OpenPhone API key. 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 |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Pro | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+ | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this OpenPhone server only. Ask your AI to run openphone_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 openphone_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 openphone_upgrade before then undoes the cancel. Or write to [email protected].
openphone_list_phone_numbersopenphone_list_usersopenphone_list_contactsopenphone_get_contactopenphone_get_contact_custom_fieldsopenphone_list_conversationsopenphone_list_messagesopenphone_get_messageopenphone_list_callsopenphone_get_callopenphone_get_call_summaryopenphone_get_call_transcriptopenphone_get_call_recordingsopenphone_list_webhooksopenphone_send_messageopenphone_create_contactopenphone_usage_statusopenphone_request_featureopenphone_upgradeopenphone_cancel_subscriptionCatch up on a text thread with a contact. Review calls and their next steps. Look up a contact. Send a text message to customers. Add a new contact. See what you can do for the details.
No. usefulapi is an independent service. It is not affiliated with or endorsed by OpenPhone. The server calls the OpenPhone API with your own OpenPhone 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 OpenPhone API key. See Before you connect for where to find it.
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 OpenPhone API key. 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 OpenPhone 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 OpenPhone.
Yes, if you approve it. 2 of the 16 OpenPhone tools can create or change data. The other 14 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 OpenPhone server only. Cancel any time: your paid plan then runs to the end of the paid period. Run openphone_usage_status to see how many calls you used.
Ask the AI to run openphone_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 openphone_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 openphone_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.