You picked Vapi. We'll build the voice agent on it — prompt engineering, voice/STT/TTS selection, telephony, function calling, CRM hooks. Flat ₹75,000 one-time, delivered in 2 weeks.
₹75,000
Flat one-time price
2 weeks
Standard delivery
₹5,000/mo
Maintenance retainer
14 days
Bug-fix warranty
Quick Build covers a single use case on Vapi. Multi-flow agents with function calling fit Production Build.
Standard configurations included in our packages.
Assistant created in your Vapi workspace with carefully tuned prompt, model, and conversation settings.
We benchmark Deepgram, AssemblyAI, ElevenLabs, OpenAI for your use case and pick the lowest-latency, best-quality combo.
Vapi tools wired to your APIs — booking systems, CRM lookups, payment links, knowledge base queries.
Phone number provisioned, SIP routing configured, inbound + outbound flows tested end-to-end.
Call events streamed to your endpoint or CRM. Recording URL, transcript, call analysis, intent detection.
Internal QA covers happy paths, edge cases, interruptions, silence handling, and platform-specific quirks.
What we'll set up and tune for your build:
Vapi Assistants API (latest version)
Models: OpenAI GPT-4o, Claude, Gemini, Together AI
STT: Deepgram Nova-3, AssemblyAI Universal, Whisper
TTS: ElevenLabs, Cartesia, PlayHT, Deepgram
Telephony: Twilio, Vonage, Telnyx, Vapi-native numbers
Tools/Function calling for external integrations
Webhooks for call lifecycle events
What you'll have at the end of the project:
Vapi assistant configured in your account (you own it)
Phone number assigned, telephony tested
Prompt template documented for future edits
Function-calling specs documented
Webhook handler deployed (your infra or ours)
Recording + transcript pipeline working
Setup runbook + troubleshooting guide
Have you considered Edesy first?
Vapi is great. But if you're an Indian business needing Hindi/regional languages, bundled Exotel telephony, GST-compliant billing, and one vendor — Edesy is purpose-built for that. Same build service at the same price.
Best for: Indian businesses, Hindi-first products, founders who don't want multi-vendor coordination
Stay on Vapi if
Vapi makes sense when you want developer-first orchestration, are happy with US-centric telephony, prefer to mix-and-match providers, or have already invested in Vapi-specific tooling.
Best for: Developer teams, US-first deployments, builders who want full provider flexibility
Predictable 6-step process from first call to deployed agent
Discovery call
30–45 min call to understand your use case, channels, volume estimates, and chosen platform. Free for standard builds, ₹25,000 for enterprise (credited).
Scope + fixed-price quote
1-page scope document with exact deliverables, timeline, prompt strategy, and price. Two days to deliver.
40% deposit, build begins
Work starts within 2 business days of deposit. You get a Slack/email channel for daily updates.
Prompt engineering + flow build
Prompt drafted, flows configured in your chosen platform, voice + STT + TTS selected for your use case.
Internal QA + your UAT
We run 50+ test calls covering happy paths and edge cases. You sign off on UAT before production deploy.
Production deploy + handoff
Number assigned, agent live, final demo, documentation handoff. 60% balance due. Maintenance retainer starts day after launch.
What the alternatives actually cost over 12 months
| Feature | Dimension | Upwork freelancer | In-house engineer | Edesy |
|---|---|---|---|---|
| Prompt engineering expertise | ||||
| Voice/STT/TTS provider knowledge | ||||
| Latency optimization built-in | ||||
| Indian language support out-of-box | ||||
| Telephony setup included | ||||
| Fixed price, no overruns | ||||
| Bug-fix warranty post-launch | ||||
| Maintenance when models/APIs change | ||||
| 12-month total cost (estimate) |
Book a 30-minute scoping call. We'll send a fixed-price quote within one business day.