Build an AI Agent for WhatsApp Business — Step-by-Step Guide & Pricing
8 min read
WhatsApp Business is where many customers already are. An AI agent on WhatsApp can answer queries, capture orders, and book slots 24/7. This step-by-step guide shows how to build an AI agent for WhatsApp Business and what to expect on pricing in 2026—for USA, Canada, and Chennai businesses.
Hendoi Technologies builds AI agents for WhatsApp Business for USA, Canada, and Chennai. Contact us for a free quote.
Decide what the agent will do: FAQ, order capture, appointments, support, or a mix. List the main intents and any actions (e.g. create order, check status). This scope drives design and cost.
You need access to the WhatsApp Business API—via Meta directly or a BSP (business solution provider). Approve your business, get a phone number (or port), and configure webhooks for incoming messages. Your development partner can guide this.
Outline happy paths and edge cases. Define when the AI answers and when it escalates to a human. Set guardrails: no sensitive data in logs, no off-topic or harmful replies. For RAG, decide which docs or knowledge base the agent will use.
Backend receives WhatsApp webhooks, runs your AI logic (LLM + optional RAG/tools), and sends replies via the API. Use a framework (e.g. Node.js, Python) and secure storage for API keys and customer data. Implement rate limiting and error handling.
Integrate an LLM (OpenAI, Anthropic, or open-source). If the agent should use your content, add RAG: chunk docs, embed, store in a vector DB, retrieve on each message, and inject into the prompt. Test with real questions.
Test with real WhatsApp numbers in sandbox, then go live. Monitor latency, errors, and quality. Plan for human handoff and fallback messages when the agent is unsure.
Simple FAQ agent (no RAG, fixed flows) ₹80,000–₹2,50,000. Basic answers, WhatsApp Business API setup, and hosting. 3–5 weeks.
RAG-based agent (knowledge base, natural Q&A) ₹2,50,000–₹6,00,000. Your docs or FAQ, better answers, optional actions. 6–10 weeks.
Custom agent (orders, bookings, CRM integration) ₹6,00,000+. Integrations with POS, CRM, or booking system. 10+ weeks.
Ongoing: WhatsApp conversation fees (per Meta), LLM API, hosting. Budget roughly ₹3,000–₹15,000/month depending on volume.
Frequently asked questions
Define scope → get WhatsApp Business API access → design flows and guardrails → build backend and connect LLM (and RAG if needed) → test and go live. A partner like Hendoi can handle the full build. [Contact us](/contact).
Simple FAQ: ₹80,000–₹2,50,000. RAG-based: ₹2,50,000–₹6,00,000. Custom with integrations: ₹6,00,000+. Plus ongoing API and hosting. [Get a quote](/contact).
Yes. Once deployed, the agent can reply to messages 24/7. You can add human handoff for complex or sensitive conversations.
Share your use case and we will give you a step-by-step plan and a transparent quote.
Contact Hendoi Technologies
Our Address:
No.19, Hanumar Koil Street,
West Mambalam,
Chennai City,
Tamilnadu State,
India - 600033
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