What Is BYO-Key (Bring Your Own API Key) AI Pricing — and Why It Cuts Chatbot Costs ~10x

BYO-key (bring your own key) pricing is a model where you connect your own OpenAI or Gemini API key to an AI platform and pay the model provider directly for the tokens you actually use — no middleman. The platform charges only a flat software subscription: no markup on each AI message and no caps on conversations. The result: the same volume of customer dialogs costs cents instead of the $0.5–1.4 per dialog that metered chatbot vendors charge.

We build Mercon — an AI sales agent that runs full conversations in Telegram, Instagram Direct and Facebook Messenger and creates the order in your CRM — and BYO-key has been built into our pricing grid from day one. In this article we'll walk through the economics honestly: where the market's $1-per-dialog price comes from, what tokens really cost, and when BYO is the wrong choice for you.

The math on one screen: a 2,500-dialog month

Take a store that handles about 2,500 AI dialogs a month. One dialog averages ~8 AI messages: greeting, product recommendation, answering sizing and shipping questions, checkout. Here is what that volume costs across platforms as of June 2026:

All competitor prices come from public pricing pages as of June 2026. The MyChatBot estimate: 2,500 dialogs ≈ 20,000 AI replies = MultiPro ($199, 3,000 replies) + ~17,000 overage replies at ~$40 per 1,000 ≈ $879. The gap between $79 and $1,600–2,475 a month isn't magic — it's simply the absence of an AI markup.

Where the $1-per-dialog price comes from

Most AI chatbots on the market are metered: Intercom Fin charges $0.99 per resolved conversation with a 50-per-month minimum, Gorgias charges $1.00 per dialog ($0.90 on annual billing), and Tidio Lyro starts at ~$0.65 per conversation with add-on bundles. The typical market band as of June 2026 is $0.5–1.4 per AI dialog.

Now the cost of goods. An ~8-message dialog on modern models costs cents in raw tokens — you can verify it yourself in your OpenAI or Google console after a week of running. The difference between cents of token cost and a dollar on the price list is the vendor's markup: marketing, infrastructure, margin, and insurance against your customers suddenly messaging ten times more.

That doesn't make metered platforms bad. Fin and Gorgias are strong support products for large stores, and Tidio is an easy entry point for small teams. But if your bot sells — handling dozens of Instagram and Telegram dialogs a day, answering "how much is it?" and walking people to the cart — a dollar per dialog eats straight into the margin of every order. We did a full market breakdown in what an AI chatbot costs per dialog in 2026.

How BYO-key works in practice

The mechanics are simple:

1. You create an API key with OpenAI or Google (step-by-step below — it takes 10–15 minutes).
2. You paste the key into Mercon's AI settings.
3. The agent runs on your key: every token is billed to your provider account at the provider's direct prices.

What that gives a store owner:

• Zero AI markup. Mercon doesn't earn on your messages — just a flat platform subscription.
• Zero message caps. On BYO plans we don't count your dialogs and never switch the bot off on the 25th of the month.
• Model control. OpenAI or Gemini — your choice, switchable any time.
• Transparency. Token spend is visible in your provider console down to the cent — no "your month cost roughly this much".

On the Growth plan with a BYO key that's $79/mo for the platform plus your direct token costs. The same Growth with our platform key is $139/mo with ≈2,500 dialogs included — about $0.06 per dialog, still far below market, because we sell software rather than reselling tokens.

An honest nuance: SendPulse also takes your key. What's different?

BYO-key as a concept isn't our invention. SendPulse's ChatGPT step in its chatbot flow-builder also requires your own OpenAI key (as of June 2026). But there it's one block inside a scripted funnel: you draw the scenario with buttons and branches, the AI answers only where you placed it, doesn't run the conversation on its own, and doesn't create CRM orders.

What's unique is the combination: BYO-key on a fully autonomous sales agent. Among the autonomous AI sales agents we checked as of June 2026, none offers bring-your-own-key: MyChatBot — the closest comparable platform in Ukraine — meters replies in bundles with no BYO option, while Fin, Gorgias and Tidio sell per conversation. Mercon, meanwhile, is an agent in the full sense: it detects intent (search / compare / objection / purchase), recommends products via semantic catalog search, builds the cart, creates the order in the CRM by itself, sends Monobank/LiqPay payment links, books the Nova Poshta shipment, and follows up on abandoned carts. We showed what that looks like in how an AI agent creates CRM orders.

When BYO is not for you

Your own key means a bit of responsibility. Skip BYO if:

• you don't want to open an OpenAI/Google account and attach a card to it;
• you don't want to watch the key's balance and spending limits;
• your accounting prefers one invoice instead of two.

That's what the platform key is for: Starter $49/mo (≈600 dialogs), Growth $139 (≈2,500), Scale $399 (≈12,500). AI included, one invoice, nothing to manage. The BYO versions of the same plans are $29 / $79 / $199. The rule of thumb: a small shop is often better off on the platform key, while from ~50–80 dialogs a day BYO starts saving hundreds of dollars every month.

How to get a key in 10–15 minutes

OpenAI

1. Sign up at platform.openai.com.
2. Top up your balance — $5–10 is enough to start.
3. In the API keys section, create a key and copy it immediately: it's shown only once.
4. In Billing → Limits, set a monthly spending cap — that's your safety fuse.

Gemini (Google)

1. Open Google AI Studio (aistudio.google.com) with your Google account.
2. Click "Get API key" and create a key.
3. For production workloads, attach a Google Cloud billing account and set a cap there too.

Then paste the key into Mercon's AI settings and run a test dialog. Tip: start with a small cap on the provider side — your first real week will show your true monthly token budget.

FAQ

Is it safe to give a platform my API key?

The key is stored in your account settings and used only for your store's dialogs. You can revoke it in your OpenAI/Google console at any moment and generate a new one, and the spending cap lives on the provider's side — spending beyond it is technically impossible.

How many tokens does one dialog use?

It depends on the model, catalog size and conversation length, but the order of magnitude is this: an ~8-message AI dialog on modern models costs cents. That's exactly why the gap versus $0.65–1.00 per-dialog pricing reaches 10x and more.

What happens if my key runs out of funds?

The provider stops accepting requests and the AI goes quiet until you top up. Enable auto-top-up or limit alerts. If you don't want to deal with it at all, take a platform-key plan — we manage the balance there.

OpenAI or Gemini — which key should I pick?

Mercon supports both, and the agent behaves the same. Pick the provider whose billing suits you better — and remember you can swap the key in settings at any time without stopping the bot.

Want to see these numbers on your own store instead of a table? Try Mercon free for 14 days — no credit card: connect Telegram or Instagram, import your catalog from CSV/XLSX, and run the AI agent on your own key or ours. Full plan details are on the pricing page.