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Pay-As-You-Go Voice AI Pricing: What to Check Before You Sign Up

Bolti Team·

Bolti is a voice AI platform for building production-ready conversational phone agents, priced at ₹7/min with no monthly seat fees — and a free trial that includes 50 minutes. This post breaks down what "pay-as-you-go" actually means across vendors, and what you should verify before you commit.

What Does Pay-As-You-Go Voice AI Pricing Actually Mean?

Pay-as-you-go voice AI pricing means you're charged per minute of call time — no fixed monthly licence, no minimum commit. In practice, though, "per minute" rarely tells the full story. Most platforms bundle four cost layers into a single call, and vendors disagree on which layers they expose.

Every voice call runs through four components:

  • STT (Speech-to-Text): Transcribes the caller's audio into text
  • LLM (Large Language Model): Decides what the agent says next
  • TTS (Text-to-Speech): Synthesizes the agent's voice
  • Telephony: Carries the call over PSTN or SIP

Some vendors quote a single per-minute rate that includes all four. Others quote the platform fee separately and bill STT, LLM tokens, and TTS characters on top — often at pass-through rates from the underlying providers. Before you sign up anywhere, you need to know which model you're looking at.

What Hidden Costs Should You Watch For?

Hidden costs in voice AI pricing fall into predictable categories. Ask about each one explicitly.

Provider pass-through fees

If a platform lets you choose your STT or LLM provider — which is a genuine feature, not a problem — find out whether those costs are bundled into the per-minute rate or billed separately. A platform charging ₹5/min for telephony + platform, then passing through Deepgram STT costs and GPT-4o token costs on top, can easily land you at ₹15–20/min in practice.

Bolti's ₹7/min pricing is a flat rate that covers the call. You choose your providers per agent — Deepgram, AssemblyAI, Cartesia, ElevenLabs, Azure, or Fennec for STT; OpenAI, Gemini, Groq, or open-source models via Baseten for LLM; multiple TTS options — and the rate stays the same.

Minimum monthly commitments

Some platforms require a minimum monthly spend or a minimum number of agent seats even on "pay-as-you-go" plans. If you're running 500 calls a month, a ₹10,000/month minimum doesn't matter. If you're piloting with 50 calls, it matters a lot.

Overage pricing tiers

Watch for plans where the per-minute rate increases after a usage threshold, or where certain features (PII redaction, call recording, sub-accounts) are only available at higher tiers.

Telephony surcharges

If you bring your own SIP trunk (Twilio, Plivo, Exotel), does the platform charge less? If you use the platform's numbers, is there a separate number rental fee? These are legitimate charges — just make sure they're disclosed upfront.

Which Questions Should You Ask Any Voice AI Vendor?

Here's a checklist to run through before you sign up for any pay-as-you-go voice AI service:

  1. Is the per-minute rate all-in, or does it exclude STT/LLM/TTS costs?
  2. Can I bring my own SIP trunk, or am I locked into the platform's telephony?
  3. Is there a monthly minimum, a seat fee, or any fixed cost?
  4. Which features require an upgrade — PII redaction, call recording, sub-accounts, SSO?
  5. What happens to my data? Where are transcripts stored, and for how long?
  6. Is there a free trial, and does it require a credit card?
  7. What's the latency on a real call — not a demo? (Anything over ~800ms sounds sluggish to callers.)
  8. Can I change LLM or STT providers per agent without repricing?

For Indian deployments specifically, also ask:

  • Does the STT support Hindi, Tamil, Telugu, Marathi, Bengali, Gujarati? Global vendors often underperform on Indian accents. Bolti supports Fennec, which is optimized for Indian languages.
  • Are the telephony numbers Indian DIDs, or will callers see international numbers?
  • Is the contract DPDP-aligned?

How to Compare Voice AI Pricing Models Side by Side

When you're comparing platforms, build a simple cost model using your actual call volume. Here's a framework:

Cost component What to check
Platform per-minute rate All-in or additive?
STT provider cost Bundled or pass-through?
LLM token cost Bundled or pass-through?
TTS character cost Bundled or pass-through?
Telephony (inbound / outbound) Included or separate?
Number rental Per number per month?
Features needed (PII, recording, sub-accounts) Which tier?
Monthly minimum Applies at your volume?

For a team running 2,000 outbound calls per month at an average of 3 minutes each — 6,000 minutes — the difference between a true ₹7/min all-in rate and a platform that bills ₹7/min plus pass-through costs can be ₹40,000–₹80,000/month. That's worth a 20-minute conversation with a vendor's sales team before you pilot.

What Does Bolti's Pricing Model Include?

Bolti charges ₹7/min, pay-as-you-go. Here's what that covers:

  • Full access to the agent builder and dashboard
  • Your choice of STT provider per agent (Deepgram, AssemblyAI, Cartesia, ElevenLabs, Azure, Fennec)
  • Your choice of LLM per agent (OpenAI, Gemini, Groq, or open-source models via Baseten — DeepSeek-V3.1, Llama 4 Maverick, Qwen3-235B)
  • Your choice of TTS voice per agent, with preview before you deploy
  • BYOC: bring your own SIP trunk (Twilio, Plivo, Exotel) or use Bolti numbers
  • Call recordings stored in private object storage with time-limited signed URLs
  • PII redaction in runtime (masks sensitive data before it reaches the LLM)
  • REST API — every dashboard action is also an API call
  • 80+ language support

Enterprise features — on-premises deployment, sub-accounts for white-labelling, SSO via OIDC/SAML, DPDP/GDPR/HIPAA-aligned contracts — are available on enterprise plans. See the full pricing breakdown to understand what's on each tier.

For data-sensitive use cases like healthcare or fintech, Bolti's PII protection is worth understanding in detail: recordings live in private object storage accessible only via signed URLs, transcripts are workspace-scoped, and the runtime can mask PII before it reaches any third-party LLM.

Start Your First Pay-As-You-Go Voice Agent on Bolti

Bolti's free trial includes 50 minutes of call time — enough to build an agent, run real test calls, and validate latency and voice quality before you spend anything. After that, you pay ₹7/min with no monthly minimum. If you're evaluating pay-as-you-go voice AI pricing and want a concrete reference point, start your free trial and run the numbers against your actual call volume.

Frequently Asked Questions

What does pay-as-you-go voice AI pricing typically include?

It varies by vendor. Some platforms charge a single all-in per-minute rate covering STT, LLM, TTS, and telephony. Others quote a platform fee and bill provider costs separately. Always ask whether the per-minute rate is all-in before comparing prices.

How much does Bolti charge per minute?

Bolti charges ₹7/min, pay-as-you-go, with no monthly minimum or seat fees. A free trial includes 50 minutes of call time.

Can I use my own telephony provider with Bolti?

Yes. Bolti supports BYOC (bring your own carrier) — you can connect your own SIP trunk from Twilio, Plivo, or Exotel, or use Bolti's own numbers.

Does Bolti support Indian languages on pay-as-you-go plans?

Yes. Bolti supports 80+ languages including Hindi, Marathi, Tamil, Telugu, Bengali, and Gujarati. For Indian-language calls, Bolti integrates Fennec, an STT provider optimized for Indian accents, available on all plans.

What should I check about data privacy before signing up for a voice AI platform?

Ask where call recordings and transcripts are stored, who can access them, whether PII is masked before reaching third-party LLMs, and whether the contract is aligned with regulations relevant to you (DPDP, GDPR, HIPAA). Bolti stores recordings in private object storage with signed URL access, masks PII in runtime, and offers DPDP/GDPR/HIPAA-aligned contracts on enterprise plans.