--- title: "Payments for AI products · Fungies" description: "Sell credit packs, metered usage and subscriptions for an AI product, with entitlements from webhooks and worldwide tax handled as Merchant of Record." image: "https://fungies.io/og-image.jpg" canonical: "https://fungies.io/solutions/ai-saas/" --- SaaS · AI products # Billing for a product whose costs move with every request. An AI product has a marginal cost that a normal SaaS does not, an audience that arrives from everywhere at once, and a pricing model that will change twice before the year is out. Credit packs, metered usage and mid-cycle plan changes are all first-class here. [Start free](https://app.fungies.io/register) [Book a demo](https://calendly.com/duke-vuh/fungies-io-demo-clone) No upfront costs. No credit card required. Already selling with Fungies [![Leadsin.io](/logos/clients/leadsin.png)](/customer-story/hosted-checkout-solution-for-leadsin-io-a-saas-business "Leadsin.io — read the story")[![RenderAI](/logos/clients/renderai.png) ](/customer-story/helping-renderai-reduce-their-ai-saas-payment-integration-from-days-to-just-a-couple-of-minutes "RenderAI — read the story")[![SuperScale](/logos/clients/superscale.png) ](/customer-story/nimblebits-revenue-boost-with-a-web-store-solution "SuperScale — read the story")[![FreeVocals](/logos/clients/freevocals.png) ](/customer-story/freevocals-com-and-fungies-io-a-seamless-solution-for-digital-e-commerce "FreeVocals — read the story")![STATSCORE](/logos/clients/statscore.png)![SimFabric](/logos/clients/simfabric.png)![BotRix](/logos/clients/botrix.png)![Enhance AI](/logos/clients/enhance-ai.png)![The Humanize AI](/logos/clients/humanize-ai.png)![Kenerate AI](/logos/clients/kenerate.png) 0 min from signup to a working checkout 0+ countries your users will come from 0+ payment methods, chosen per user $0 monthly platform fee ## What AI pricing needs that ordinary billing lacks 001 Packs Credits, not just seats Sell a pack of generations as a one-time purchase, or bundle an allowance into a plan and charge for what goes beyond it. Both are ordinary products here, and both settle into the same order stream. 002 Metered Usage you can charge for Pay-as-you-go pricing, plus one-off amounts charged onto a live subscription. When a user burns their allowance on day nine, the overage does not have to wait for the next renewal. 003 Flexible Pricing will change Model costs drop, competitors move, and the tier that made sense in spring does not in autumn. Plans, offers and intervals are configuration, and moving a customer between them is prorated to the day. 004 Global Your users are everywhere on day one AI products get international from the first tweet. Local payment methods, local pricing and the VAT or GST on each charge are handled from the first sale, not after an accountant asks. ![Subscription plans with credit allowances and usage-based charges listed alongside monthly recurring revenue.](/_astro/subscriptions.CS4yi8pK_1kMw30.webp?dpl=dpl_8EZJmbvb3ugYq7WK1KgC21BX19Zp) Plans, allowances and the overage charges on top of them, in one view. ## Shipping pricing for an AI product 1. 01 ### Decide the unit A credit, a generation, a seat or a month. Whichever it is, model it as a product with offers rather than as code. 2. 02 ### Put checkout in the app An overlay opens over your pricing page so nobody leaves mid-upgrade. Embedded works if a modal is wrong for the flow. 3. 03 ### Grant on the event Credit the account from the payment webhook, not from the browser redirect. The tab gets closed; the webhook still arrives. 4. 04 ### Change the pricing later Add plans, retire offers, move customers with proration. None of it requires a migration or a new integration. Merchant of Record ## You could do all of this yourself Selling digital goods across borders means registering for tax in each market, wiring up a tax engine, and answering for every dispute. As your Merchant of Record, that is our name on the paperwork instead of yours. What it takes Fungies Processor only 01 Tax registration ✓ None needed — we are already registered. You register for VAT and sales tax per market. 02 Tax calculation ✓ Real-time rates on every transaction. You wire up a tax engine and maintain it. 03 Remittance ✓ We file and pay the authorities directly. You file monthly, quarterly, and annually. 04 Audits ✓ We answer the tax authority. You keep the records and take the questions. 05 Chargebacks ✓ Disputes and fraud handled for you. Your team fights each case. 06 Pricing ✓ One commission, only when you sell. Processor fee plus tax software plus consultants. 07 Accounting ✓ You receive net revenue. Gross receipts plus a tax liability to track. ## The pieces you would otherwise build Credit packs One-time purchases at any tier, with the bulk discount expressed as ordinary pricing rather than logic. Free trials that convert Start a plan in trial and let it roll over, or end the trial early through the API when someone upgrades. Entitlements from webhooks Open access on payment\_success and close it on cancellation, so credits follow money rather than a nightly job. Self-serve upgrades A branded portal where users change plan, buy more credits or update a card without emailing support. An API and an MCP server REST at api.fungies.io/v0, a JavaScript SDK, a CLI, and an MCP server your own agents can call. Tax on every charge Calculated for the buyer's country, remitted and filed under our registrations, including on renewals. Pricing 5% + 50¢ per sale, and nothing else Negotiable at higher sales volume. [See full pricing →](/pricing) [Start free →](https://app.fungies.io/register) ## No monthly fee. No minimum. No card to get started. One rate covers the whole stack. There is no tier that unlocks tax filing and no add-on for the store builder. - ✓ Payment processing - ✓ Tax calculation and filing - ✓ Fraud screening - ✓ Chargeback handling - ✓ Store builder and hosting - ✓ Every platform feature ## Teams like yours, already shipping [All customer stories →](/case-studies-customers) [ AI SaaS Uruguay ### RenderAI From days of integration to a couple of minutes An AI image platform replaced a slow manual payment process with three subscription tiers and an overlay checkout. Minutes to replace a days-long integration Read the story →](/customer-story/helping-renderai-reduce-their-ai-saas-payment-integration-from-days-to-just-a-couple-of-minutes)[ AI SaaS Canada ### TextToVideo.bot Weeks of payment work, done in minutes An AI video generation platform launched its subscription business without writing a payment integration at all. Minutes to stand up subscription plans Read the story →](/customer-story/how-fungies-enabled-texttovideo-bot-to-integrate-payments-in-minutes)[ SaaS United Arab Emirates ### Viewbot.tv Merchant of Record billing, live in one session The engagement platform for Twitch and Kick streamers moved its whole subscription business onto a checkout that matches its own dark theme. 1 session from first API call to live payments Read the story →](/customer-story/viewbot-customizable-checkout-merchant-of-record-payment) ## Questions from AI teams ### Can I sell credits rather than a subscription? ### How do I bill for usage above an allowance? ### How should my backend grant credits? ### What about tax when my users are worldwide? ### Can my agents call the platform directly? ## More for SaaS teams - [SaaS companies → Sell subscriptions worldwide with no tax registrations.](/solutions/saas) - [API and developer tools → Usage-based billing with keys that follow the subscription.](/solutions/api-products) - [Solo founders → Sell worldwide without a finance function behind you.](/solutions/indie-saas) ## Price your model before you rewrite your billing Set up a credit pack and a plan, take a sandbox purchase, and change the numbers as often as the costs do. [Start free](https://app.fungies.io/register) [Book a demo](https://calendly.com/duke-vuh/fungies-io-demo-clone) No upfront costs. No credit card required. ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://fungies.io/#organization","name":"Fungies","legalName":"Fungies Inc.","url":"https://fungies.io/","description":"Merchant of Record for SaaS, games, and digital products. Fungies handles global payments, VAT and sales tax, and checkout. 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Fungies handles global payments, VAT and sales tax, and checkout. Free to start, commission only.","inLanguage":"en","publisher":{"@id":"https://fungies.io/#organization"}},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://fungies.io/"},{"@type":"ListItem","position":2,"name":"Solutions","item":"https://fungies.io/solutions"},{"@type":"ListItem","position":3,"name":"Payments for AI products","item":"https://fungies.io/solutions/ai-saas"}]},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"Can I sell credits rather than a subscription?","acceptedAnswer":{"@type":"Answer","text":"Yes. Credit packs are one-time purchases, and you can run them alongside subscriptions in the same catalogue. Many AI products end up selling both to different segments."}},{"@type":"Question","name":"How do I bill for usage above an allowance?","acceptedAnswer":{"@type":"Answer","text":"Pay-as-you-go pricing covers metered products, and you can also charge a one-off amount onto a live subscription mid-cycle for an overage or an add-on."}},{"@type":"Question","name":"How should my backend grant credits?","acceptedAnswer":{"@type":"Answer","text":"On the payment_success webhook, which fires for the first charge and every renewal. Do not fulfil on subscription_created alone — it can arrive while the first payment is still pending."}},{"@type":"Question","name":"What about tax when my users are worldwide?","acceptedAnswer":{"@type":"Answer","text":"We are the Merchant of Record, so VAT, GST and US sales tax are calculated, collected, remitted and filed under our registrations. You are not registering in the EU or watching US nexus thresholds."}},{"@type":"Question","name":"Can my agents call the platform directly?","acceptedAnswer":{"@type":"Answer","text":"Yes. Alongside the REST API and CLI there is an MCP server with documented Cursor, Claude and VS Code integration, so an agent can query orders or manage products."}}]}]} ```