How Credits Work

Credit Deduction Flow

Every voice call follows this billing flow:

1. Pre-Call Balance Check

When you start a call (web, phone, widget, or WhatsApp), osmTalk checks your balance:

Balance >= ₹1 → Call proceeds
Balance < ₹1  → HTTP 402: "Insufficient credits"

2. During the Call

While the call is active, the voice bot collects usage metrics in real-time:

• Prompt tokens — LLM input tokens consumed
• Completion tokens — LLM output tokens generated
• TTS characters — Characters converted to speech
• Duration — Total call length in seconds

No credits are deducted during the call.

3. After the Call

When the call ends, osmTalk:

1. Calculates the total cost based on the agent's provider configuration and actual usage
2. Deducts credits atomically — if balance is insufficient, the call is marked as "billing failed"
3. Records a transaction for your billing history

Example

A 5-minute phone call using GPT-4o + Deepgram:

LLM:  2,400 tokens → ₹2.20
STT:  5 minutes    → ₹2.63
TTS:  1,800 chars  → ₹3.30
SIP:  5 minutes    → ₹7.03
─────────────────────────
Total deducted:      ₹15.16

Billing Status

Each call has a billing status visible in your Call Logs:

Currency

All credits are in INR (₹). Provider costs (in USD) are converted at the current rate (₹94/USD).