Zalo OA Chatbot for Business: Pricing, Plans and Setup
A customer messaging a business on their phone. Stock photo (CC0).
Zalo is Vietnam's biggest messaging platform, yet many businesses treat their OA as a static brochure: messages get answered by hand and missed after hours. This guide covers the latest Zalo OA pricing, which plan you actually need for a chatbot, and how to plug an AI agent in so your Zalo channel sells and serves customers 24/7.
Zalo reached 79.6 million monthly active users at the end of 2025 and passed 80 million in early 2026, with over 2.1 billion messages sent daily. To run a chatbot you need a verified OA and a paid plan with API access: Standard about 1,000,000 VND/year, Growth about 2,500,000 VND/year (the first tier with chatbot + API), Comprehensive about 6,000,000 VND/year. Consulting messages outside the 48-hour window cost about 55 VND each. Connecting an AI agent via webhook cuts reply time from hours to seconds, with hard cases still escalated to humans.
Why is Zalo worth a chatbot investment?
According to Zalo's own announcements, the platform reached 79.6 million monthly active users at the end of 2025 - up nearly 2 million from 2024 - and passed 80.2 million in Q1 2026. More than 2.1 billion messages are sent through Zalo every day. Decision Lab's The Connected Consumer report for Q3 2025 put Zalo's penetration rate in Vietnam at 83%, the highest of any messaging app. In short: your Vietnamese customers are almost certainly on Zalo daily, and a Zalo message gets opened far more naturally than an email or SMS.
Zalo OA pricing 2026: which plan do you need for a chatbot?
A verified business OA has a free tier with basic limits - enough to receive messages customers send you first. Going further requires a paid plan, and the key chatbot question is API access: the Standard plan at about 1,000,000 VND/year covers manual 1-1 chat with up to 5 staff; the Growth plan at about 1,400,000 VND/6 months or 2,500,000 VND/year is the first tier that unlocks chatbot, automation and the API, with up to 15 staff; the Comprehensive plan at about 3,400,000 VND/6 months or 6,000,000 VND/year supports up to 100 staff and the highest API limit of 2,000 requests/minute. Prices include 10% VAT per the published Zalo Business Solutions price list and can change, so double-check the official pricing page before buying.
The three paid Zalo OA plans per the Zalo Business Solutions price list, VAT included. Chatbot and API access start at the Growth tier. Prices may change over time.
What can a Zalo chatbot actually do?
On an API-enabled plan, an OA chatbot can cover the full cycle: answer product and pricing questions the moment a customer writes - even at 11pm; confirm orders and book appointments straight into your systems; send reminders within the care window; and qualify customers before routing them to staff. Zalo's unique strength is that accounts are tied to real phone numbers, so the channel shines with customers you already have - placed orders, booked appointments, returning buyers - rather than cold traffic from ads, which is Facebook's turf. Mind the running cost: consulting messages sent outside the 48-hour window from a customer's last interaction cost about 55 VND each, so a good chatbot script maximises that free window.
A customer interacting with a business right on their phone. Stock photo (CC0).
Connecting an AI agent to a Zalo OA: 4 steps
A scripted chatbot only answers questions it predicted; an AI agent understands natural language and looks up your real business data before replying. A typical rollout has 4 steps: one, verify the business OA and buy an API-enabled plan (Growth or above); two, structure your product data, price list and policies into a source the AI can query; three, connect the message webhook so customer messages flow to the AI agent, which replies within seconds and escalates hard cases to humans; four, run supervised for 1-2 weeks, tune on real conversations, then go fully automated. Typical total rollout is 2-4 weeks. This mirrors the AI agents Chạm AI builds for retail and service businesses - see our 6-step AI agent implementation process and AI agent cost guide.
Common mistakes with Zalo chatbots
The three most repeated mistakes: buying the Standard plan and only then discovering it has no API, so no chatbot - pick your plan around automation needs from day one; routing every message to the bot including complaints - sensitive cases must escalate to humans or customers walk away; and abandoning the bot after launch - without reviewing conversations it never improves, so sample chats weekly for the first month. If you have read our 7 AI agent implementation mistakes, every principle there applies to the Zalo channel too.
Frequently asked questions
Does a Zalo OA cost money?
A verified business OA has a free tier with basic limits. To use a chatbot, the API and proactive messaging you need a paid plan: Standard about 1,000,000 VND/year, Growth about 2,500,000 VND/year, Comprehensive about 6,000,000 VND/year (VAT included, per the Zalo Business Solutions price list).
How is a Zalo chatbot different from a Facebook chatbot?
The biggest difference is user context: Zalo has 79.6 million monthly active users in Vietnam and accounts are tied to real phone numbers, so it excels at serving customers you already have - order confirmations, appointment reminders, after-sales care. Facebook is stronger for cold traffic from ads. Most Vietnamese businesses need both.
How do I connect an AI agent to a Zalo OA?
You need an OA plan with API access (from the Growth tier), then connect the message webhook to your AI agent system: the AI reads each customer message, looks up your product data and replies within seconds, escalating hard cases to a human. Typical rollout takes 2-4 weeks depending on data complexity.