Zalo OA Chatbot for Business: Plans, Fees & Setup 2026
A customer messaging a business on their phone. Stock photo (CC0).
A Zalo OA chatbot for business needs a verified Official Account, an API-enabled plan from Growth upward, a webhook and clear human-handoff rules. This guide compares the relevant OA plans and message fees, then shows how to connect an AI agent so customer questions are answered in seconds without leaving sensitive cases to automation.
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 (~US$40), Growth about 2,500,000 VND/year (~US$95, the first tier with chatbot + API), Comprehensive about 6,000,000 VND/year (~US$230). 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.
What is a Zalo Official Account (OA)?
A Zalo Official Account is a verified business profile on Zalo, Vietnam's largest messaging platform. It works like a business phone number inside the app: customers follow it, message it, and receive order updates through it. Unlike a personal Zalo account, an OA can be verified with a company registration, carries a blue tick, and exposes an API so software can read and reply to messages automatically.
Three things separate an OA from a Facebook Page. Zalo accounts are tied to real phone numbers, so the audience is customers you already have rather than cold traffic. Plans are paid annually and only some tiers open API access. And the free reply window runs 48 hours from the customer's last interaction, after which consulting messages are charged.
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 (roughly US$40) 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 (roughly US$95) 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 (roughly US$230) 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. Reaching out first is a separate matter: to send a Zalo OA message to a phone number you need ZBS Template Message with a pre-approved template, which since 1 January 2026 has replaced ZNS and both kinds of UID message.
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.
Pick your chatbot budget from the business problem, not from the technology. Stock photo (CC0).
What budget components should a Zalo OA chatbot plan include?
A Zalo rollout budget has several separate components: the OA service plan, implementation, monthly AI or hosting use, integrations, maintenance and messages outside the free care window. The ranges below are August 2026 reference figures for small and medium businesses, not a project quote.
| Level | What it does | Setup cost | Running cost |
|---|---|---|---|
| Scripted chatbot on an existing platform | Answers menus, price lists and repeat questions along a pre-built flow | 5 - 15 million VND one-off | Platform fee, usually a few hundred thousand VND a month |
| Subscription AI chatbot SaaS | Handles free-form questions, but hard to load deeply with your own data | Close to zero | A few hundred thousand to a few million VND a month |
| Custom-built AI agent | Knows your products, speaks your brand voice, connects CRM and website | From tens of millions of VND | Model plus operating fees, scales with volume |
Total cost of ownership for a Zalo chatbot is therefore the OA plan fee (1 - 6 million VND/year) + implementation + out-of-window message fees. For market-wide build ranges and the five items every supplier quote should contain, use the dedicated chatbot development pricing guide for website, Zalo OA and Facebook. A detailed breakdown of AI-agent levels is in our AI agent cost guide, and the AI agent ROI calculator estimates revenue lost to slow replies. For an exact number for your industry, leave your details and get a free quote within 24 hours.
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 (~US$40), Growth about 2,500,000 VND/year (~US$95), Comprehensive about 6,000,000 VND/year (~US$230). Prices include VAT, 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.
What budget components should a Zalo OA chatbot plan include?
Budget separately for the Zalo OA service plan, chatbot implementation, monthly AI or hosting use, integrations, maintenance and messages outside the free care window. For market-wide build ranges across website, Zalo OA and Facebook, use the dedicated chatbot development pricing guide rather than treating the OA plan fee as the full project cost.