By KYN AI Advisory Team — AI implementation specialists, Singapore
Answering a WhatsApp enquiry within five minutes needs three things: a system that notices the message at once, a drafted reply based on your own price list and policies, and a named person on shift who approves it. Software handles the first two. The third is a staffing decision. This article describes the design and the unit costs. It is a method, not a client result: we have not published a client reply-time figure and we do not quote one. Set the target, then measure your own median.
Why does reply time matter?
Because an enquiry is a person comparing options. The first company to answer usually sets the frame for the rest. We have no sourced figure for how much speed raises conversion, so we make no such claim. What you can measure yourself is the share of enquiries answered inside your target and the share that turn into a meeting.
Slow replies have mundane causes: the phone sits on one person's desk, enquiries arrive at night, nobody knows who owns a message, and the answer needs a price someone must look up.
What does the flow look like?
- Receive. Every inbound message lands in a shared inbox through the WhatsApp Business Platform, not on one phone. Each message gets a timestamp and an owner field.
- Identify. The system matches the number to a contact, a company and any open deal in the CRM.
- Classify. A model labels the message: new enquiry, existing customer, price question, complaint, booking, other. About S$0.01 per reply sorted on our live system.
- Draft. The system writes a reply from approved material: your services, price list, hours, location and a few worked answers. It cites the source passage beside the draft.
- Route. The message and the draft go to the person on shift. Complaints and unusual cases go to a named senior person with no draft sent.
- Approve and send. A person approves or edits. The reply goes out under your name.
- Log. The exchange is written to the CRM with actor, time and result.
The five-minute clock runs from step 1 to step 6. Steps 2 to 5 take seconds. The constraint is how fast the person approves.
Who approves, and when?
Outbound messages wait for a named person. That is a rule in our designs. It means a five-minute target is a rota question:
- Who is on shift, and during which hours?
- What happens when they do not answer in two minutes? The system escalates to the next person.
- What replies are pre-approved? A fixed answer to "what are your opening hours" can be sent after a single tap. A quote cannot.
- What do you send outside hours? An acknowledgement that states when a person will reply, drafted in advance and approved once.
For the safety reasoning, see is it safe to let an AI agent send emails to customers; the same logic applies to WhatsApp.
What does it cost?
| Item | Cost basis | |---|---| | Classifying a reply | About S$0.01 each on our live system | | Drafting a reply | A few cents at most per draft; depends on length and model | | WhatsApp conversation fees | Set by Meta, by message category and country; see our guide to WhatsApp Business API cost in Singapore | | Person time to approve | Seconds per message | | Build and retainer | Quoted after the review |
The software cost per reply is small. The person time and the platform fees set the budget.
What can the drafts safely say?
Draft only from material you have approved. We build a small knowledge file: services, prices that are public, hours, locations, policies and a set of model answers. The drafting step may use only that file, cites the passage, and says "I will check and come back" when the answer is not there. It does not invent a price, a date or a promise.
Price questions are a boundary. The agent can quote from the approved list. Discounts and special terms go to a person. See the negotiation authority boundary.
How do you measure it?
- Median time to first reply, by hour of day and day of week.
- Share inside target, such as five minutes during staffed hours.
- Edit rate: how often the person changes the draft, and what they change.
- Handover rate: messages that needed a person to write from scratch.
- Conversion: enquiries that become a meeting or a quote.
Start with a baseline week before the build. Many teams find their median is hours, driven by after-hours messages and a single phone owner. Fixing ownership and the rota often does more than the drafting.
What are the trade-offs?
- Staffing. A five-minute target during staffed hours costs a rota. Software does not cover that.
- Tone. Drafts need a style guide and a few reviewed examples, or they read as generic.
- Languages. Replies in Bahasa Indonesia, Chinese or English each need their own approved material.
- Platform rules. WhatsApp's business messaging rules and fees change. Check Meta's current documentation before you design around them.
What should you fix before you build anything?
Three things, none of which needs software.
- One shared number. Move from a personal phone to the WhatsApp Business Platform inbox so more than one person can see and answer.
- One owner per message. Every message has a named owner within a minute, by rota.
- One approved answer sheet. Write the ten questions you get most and the answers you stand behind.
Teams that do these three see their median reply time move before any drafting agent exists. The agent then holds the gain through nights, weekends and holidays, and makes sure the same answer goes to everyone.
How do you handle after-hours messages?
Decide the policy in writing. A common pattern is one approved acknowledgement that names the next staffed hour, followed by a queue sorted so the oldest message is first when the shift starts. Urgent keywords, such as a complaint or a cancellation, route to a named senior person's phone as a notification. The queue is visible to everyone, so nothing depends on one person remembering. Measure the after-hours median separately from the staffed-hours median, because mixing them hides both problems.
Where KYN fits
KYN builds WhatsApp inbox and reply flows as part of a sales system or an operations system in your own cloud account. For a manufacturer, we built a 06:30 morning report to each department on WhatsApp, at about S$0.05 per report. For an insurance brokerage, a reply desk sorts each reply at about S$0.01. Outbound messages wait for a named person, and every action is logged with the actor.
The first 14 days are a review of your stack and interviews with your team. A full build ships in under 90 days. See also managing WhatsApp enquiries across a sales team.
Frequently asked questions
Can an AI agent reply on WhatsApp automatically?
It can draft replies from approved material at once. We keep a named person approving each outbound message, so the reply time depends on how fast that person responds.
What is a realistic reply time?
It depends on your rota. During staffed hours a five-minute target is workable once messages reach a shared inbox with an owner. After hours, send an approved acknowledgement that states when a person will reply.
Does the agent handle price questions?
It quotes from a price list you approved. Discounts, special terms and anything outside the list go to a person.
Checked 30 October 2026.
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