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How to Auto Reply on Your WhatsApp with AI (No Business API)

"What time do you open?" "How much is a haircut?" "Where are you?" If you answer the same questions on WhatsApp all day, you've probably looked for an auto reply.

WhatsApp Business has away messages and quick replies, but they're fixed text. The away message answers everyone the same way, whether they asked for your prices or wrote "Happy birthday!". And regular WhatsApp has nothing at all.

An AI connected to your WhatsApp can do better. Every 15 minutes it checks who is waiting for your reply, and:

  • If it knows the answer for sure (it's in your FAQ), it replies the way you write, and marks the chat as read.
  • If it isn't sure, or it's personal ("What are you doing tomorrow?"), it doesn't touch it. The chat stays unread for you.

Not the WhatsApp Business API

Meta's WhatsApp Business API (Cloud API) is built for auto replies, but it's a different product: it only works with business numbers, never with a personal WhatsApp account, and it usually needs a developer or a paid provider to set up.

This guide is for the WhatsApp you already have on your phone: your personal account or the WhatsApp Business app, same number, same chats. Nothing to register with Meta.

This guide shows how to set it up with WhatsApp MCP and Grok Bot, which can run a task on a schedule. No install, no coding, about ten minutes.

Step 1: Connect Grok Bot to WhatsApp

  1. Go to wa-mcp.com and pick Grok Bot under Which AI do you use?.
  2. Click Get my WhatsApp key. One click opens Grok Bot with the setup prompt ready to send.
  3. Link your WhatsApp by scanning a QR code or typing a pairing code, just like linking WhatsApp Web.

Full walkthrough: how to connect Grok Bot to WhatsApp. The connector must be connected before the next steps, or the scheduled task has nothing to check.

Step 2: Write your FAQ

The FAQ is the list of things your AI is allowed to answer on its own. Write it as short, concrete facts:

- Opening hours: Monday to Saturday, 10 am to 7 pm. Closed Sundays.
- Address: 245 Main Street, next to the pharmacy. Street parking.
- Prices: haircut $25, color from $60, beard trim $15.
- Booking: only through https://example.com/book. I don't confirm times by chat.
- Payment: cash or card.

Tips:

  • Be specific. "Haircut $25" works. "Ask me for prices" doesn't help anyone.
  • Say what it must leave for you, for example "Never confirm an appointment or a discount, leave those for me."
  • Only links you want sent. The AI won't add links that aren't in your FAQ.

Step 3: Ask Grok Bot to run it every 15 minutes

You don't need any menus. In a chat with Grok Bot, send "Every 15 minutes, do this:" followed by the instructions and your FAQ:

Every 15 minutes, do this:

Check my WhatsApp for chats waiting on my reply. For each one:
- Skip it if I wrote in that chat in the last 30 minutes (I'm already talking there).
- Read the conversation and compare what they're asking with my FAQ below.
- Reply only if the FAQ answers everything they asked and you're sure the answer is right. Match how I write in that chat, keep it short, and send it without asking me: I approve these replies in advance.
- After replying, mark the chat as read.
- If anything is personal, unclear or not covered by the FAQ, don't reply and don't mark it as read. Leave it for me.
- Never start new conversations, never send the same text to several people, and don't send links that aren't in the FAQ.
At the end, list who you answered (and what you said) and who you left for me.

My FAQ:
- Opening hours: ...
- Address: ...
- Prices: ...

Grok Bot saves it as a routine, sometimes after asking you to confirm. To see it, pause it or change it, click the agent's name at the top of the chat: the Routines list is in the info pane that opens.

Step 4: Check the first runs

For the first day, read the summary after each run: who it answered, what it said, and who it left for you.

A good test: ask a friend to send you one question from your FAQ and one personal question. The first should get an answer in your style within about 15 minutes. The second should stay unread on your phone.

If a reply wasn't right, add the missing fact to the FAQ, or a rule like "don't answer questions about X", and tell Grok Bot to update the routine.

Why every 15 minutes?

Grok Bot can run a routine as often as every 5 minutes, but we suggest 15:

  • You get the first chance. If you answer someone yourself in the meantime, the chat is no longer waiting and the AI skips it.
  • It looks human. Replies arrive anywhere from a few minutes to about a quarter of an hour after the message, never instantly. Runs can also start a few minutes early or late, which adds to that.
  • Fewer runs. Each run uses your Grok Bot usage, even when nobody wrote.

Keep it safe

  • It only answers people who wrote to you first. It never starts conversations, and groups are left out.
  • One personal reply per chat. Sending the same text to many people can get your number banned by WhatsApp. WhatsApp MCP also shows "typing…" before each message and spaces out your sends, which lowers the risk. It doesn't remove it.
  • Unread means "for you". The AI only marks as read the chats it answered, so your phone's unread chats are the ones that need you. If you'd rather review everything yourself, remove the "mark the chat as read" line.

Frequently asked questions

Can I auto reply on WhatsApp without WhatsApp Business? Yes. Regular WhatsApp has no auto reply, but an AI connected to your number can reply for you. It works the same on regular WhatsApp and WhatsApp Business.

Do I need the WhatsApp Business API? No. The API is Meta's product for business numbers and doesn't work with personal accounts. WhatsApp MCP connects to the number you already use, personal or WhatsApp Business app, as a linked device, like WhatsApp Web.

Will it answer personal messages? Not if you use the instructions above. Anything personal, unclear or not in your FAQ is left unread for you.

How does it write like me? Before replying, WhatsApp MCP shows the AI how you usually write in that chat: length, tone, emoji and language.

Will it reply twice to the same message? No. Once it answers, you're the last one who wrote, so the chat is no longer waiting for a reply. It only looks at that chat again if the person writes something new.

Will people see blue ticks? Only in the chats it answers, where it marks the message as read. Checking your chats doesn't send blue ticks, so the chats it leaves for you stay unread on both sides.

Does it reply in groups? No. It only checks one-to-one chats waiting for your reply.

Can it run every 5 minutes? Yes, Grok Bot allows it. We suggest 15 so you can answer first and the replies don't look instant.

Is it free? Yes. After the 1-hour free trial, checking your chats and replying to people who wrote you stay free, but each reply ends with "Sent via wa-mcp.com", so people can tell it was automated. Pro (from US$4 a month, billed yearly) removes that line and adds scheduling, sending files, voice note transcription, and editing, reacting to and deleting messages.

Does it work with other AIs? The steps are for Grok Bot because it can run a task on a schedule with the WhatsApp connector. ChatGPT, Claude and Muse can do the same check when you ask them, for example "who haven't I replied to?".

Is my data private? WhatsApp MCP stores your messages only so your AI can read and search them, and deletes them automatically after 90 days. Your data is never sold or used to train AI models. Messages your AI reads are also processed by its provider (xAI for Grok Bot) under its own privacy policy.

Tired of answering the same questions? Connect Grok Bot to WhatsApp and give it your FAQ. Setup is free and no credit card is needed.