usefulapiRegi MCP server
List WhatsApp numbers and templates; send an approved template message in Regi. Hosted by usefulapi: connect it to Claude, ChatGPT, Cursor or any MCP client.
What can I ask?
Turn on the Regi connector, then ask in plain words. The AI picks the tools.
- Which WhatsApp numbers does our Regi account send from?
- List our approved message templates and how many variables each one needs.
- Send the cliente_bienvenida template to 5492611234567 with the name Juan Perez and order PS-1234.
What you can do with Regi in Claude and ChatGPT
For Argentine businesses that send approved WhatsApp template messages through Regi.
Find the sender number for a send
List the WhatsApp Business numbers of the account. Each id is the phone number id that a send needs.
Review the approved message templates
List the templates with their language, category and status. Only approved templates can be sent. The variables show how many values the body needs.
Send an approved template to one recipient
Send one approved template to one recipient. Each message is billed and reaches a real person. Values fill the variables in order.
Changes dataHow do I connect Regi?
Before you connect
The login page asks for your Regi API key.
Create it in Regi → Administración → Claves de API (admin role; Signal plan). Keys start with regi_live_. Your key is used only to call the Regi API on your behalf and to derive a private account id; it is never shown to anyone.
Claude claude.ai · Desktop
- Open Customize → Connectors, then click + Add → Add custom connector.
- Enter the name Regi and this URL, then click Add:https://
regi. usefulapi. io/ mcp - Claude opens the login page: enter your Regi API key.
- In a chat, click + → Connectors and turn on Regi.
Team and Enterprise: an Owner adds the connector for the organization first.
ChatGPT chatgpt.com
- Open Plugins, click +, then Add custom MCP server.
- Enter the name Regi and this URL, choose OAuth as the authentication, confirm the warning and create it:https://
regi. usefulapi. io/ mcp - ChatGPT opens the login page: enter your Regi API key.
- In Plugins, install Regi, then choose it in a chat.
No Add custom MCP server option? It depends on your account or workspace settings: see OpenAI's guide.
Claude Code
Run this command, then run /mcp in Claude Code to log in:
Cursor
Add to Cursor or add this to ~/.cursor/mcp.json:
{
"mcpServers": {
"regi": {
"url": "https://regi.usefulapi.io/mcp"
}
}
} VS Code
Add to VS Code or add this to .vscode/mcp.json:
{
"servers": {
"regi": {
"type": "http",
"url": "https://regi.usefulapi.io/mcp"
}
}
} Codex
Run these commands. The second one opens the login page:
Other clients
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 Regi 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.
Pricing
| Plan | Price | Limit |
|---|---|---|
| Free | $0 | 50 tool calls / month |
| Proper user | $9/mo · $90/yr | 10,000 tool calls / month |
| Pro+per user | $39/mo · $390/yr | 100,000 tool calls / month |
Each paid plan covers this Regi server only. Ask your AI to run regi_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 regi_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 regi_upgrade before then undoes the cancel. Or write to support@usefulapi.io.
Tools 7
Show all 7 tools (the AI picks them for you)
Read only · 2
- List WhatsApp phone numbers
regi_list_phone_numbersList the WhatsApp Business phone numbers of the Regi account. Each `id` is the phoneNumberId that regi_send_template needs. Use this first when you do not know the phoneNumberId. - List message templates
regi_list_templatesList the WhatsApp message templates of the Regi account with name, language, category and status. Only templates with status APPROVED can be sent. The componentsJson field shows how many {{n}} variables the body expects.
Changes data · 1
- Send a WhatsApp template
regi_send_templateSend one approved WhatsApp template to one recipient. This bills per message and reaches a real person. Regi blocks a second send of a template to the same recipient within 2 hours until the recipient replies (HTTP 400); this tool does not bypass that block. Values in body_parameters fill {{1}}, {{2}}, … in order.
Your usefulapi plan · 4
- Usage status (free-tier meter)
regi_usage_statusReport the caller's current usage: the plan, calls used this month, the limit of the plan (the free monthly cap or the Pro fair use limit), remaining, and whether the limit is reached. Read-only; does not count against the meter. - Request a missing feature
regi_request_featureTell usefulapi that the user needs something the Regi tools cannot do yet (a missing tool, field or filter). Call it only when the user asks for something none of the tools can do, and tell the user that you send the request. Do not call it for errors or for normal requests. Do not include personal data, credentials or customer records. Stored with the product name and the client type (for example Claude or Cursor), without the user's account. At most 5 requests per day. Does not count against the meter. - Upgrade to Pro or Pro+
regi_upgradeGet a paid plan for Regi (the free tier caps monthly usage). Pro: 10,000 tool calls a month, for normal use — plan "monthly" ($9/month) or "yearly" ($90/year, 2 months free). Pro+: 100,000 tool calls a month, for automations and heavy use — plan "plus" ($39/month) or "plus_yearly" ($390/year). Without a plan it returns both Pro and Pro+, each with a payment link, for the user to choose; with a plan, one link. An existing Pro subscription changes to Pro+ in place: call without confirm first, as the reply states the exact charge for this account (the price difference for the rest of the period, or in a free Pro trial the full Pro+ price, as the trial ends); then call with confirm: true. Cancel any time: the plan then runs to the end of the paid period, so it also suits a one-time job. A link opens Stripe Checkout in the browser; after payment the account upgrades automatically. Does not count against the meter. - Cancel the Pro subscription
regi_cancel_subscriptionCancel the caller's Regi Pro subscription at the end of the paid period (no refund for the current period; Pro continues until then, then the free tier applies). Requires confirm: true. Run regi_upgrade later to undo the cancel before the period ends. Does not count against the meter.
FAQ
What can I do with Regi in Claude or ChatGPT?
Find the sender number for a send. Review the approved message templates. Send an approved template to one recipient. See what you can do for the details.
Is this an official Regi product?
No. usefulapi is an independent service. It is not affiliated with or endorsed by Regi. The server calls the Regi API with your own Regi access, so it sees only the data that your account can see.
Can I connect Regi to Claude or ChatGPT?
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.
What do I need to connect?
The login page asks for your Regi API key. See Before you connect for where to find it.
Do I put my Regi key or an Authorization header in the client config?
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 Regi 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.
How do you keep my Regi credentials?
The login stores them encrypted in the authorization grant of your connection. The server uses them to call the Regi 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 Regi.
Can the AI change my Regi data?
Yes, if you approve it. 1 of the 3 Regi tools can create or change data. The other 2 are marked read-only. Most MCP clients ask you to approve a tool call before it runs.
What does it cost?
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 Regi server only. Cancel any time: your paid plan then runs to the end of the paid period. Run regi_usage_status to see how many calls you used.
How do I subscribe or cancel?
Ask the AI to run regi_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 regi_cancel_subscription. Your paid plan continues to the end of the paid period.
What if a Regi tool that I need is missing?
Tell the AI what you wanted to do. It can send the request with regi_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.
Which AI clients can I use?
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.