Who takes a cut of your sales? AI business builders' fees, compared
- Published
Disclosure: Foundable publishes this comparison and is one of the products in it. Every fact about another product comes from that company's own pages, read on November 2, 2026, and linked where it appears. Fees change, so check them before you choose.
In short: Polsia keeps 3% of each customer payment, and new payments wait 31 days before they can be paid out. NanoCorp keeps 20% of each withdrawal. Foundable, Cofounder and Durable add no fee of their own to your sales. Stripe's processing fee applies in every case.
Fees on your sales, compared
| Fee on your sales | Kept from $1,000 of sales | Where your customers' money goes | |
|---|---|---|---|
| Foundable | None (Terms) | $0 | A Stripe account in your name |
| Polsia | 3% of each payment (terms, section 4) | $30 | A Stripe Express account Polsia sets up, with a 31-day settlement before payout (payouts and fees) |
| NanoCorp | 20% of each withdrawal (withdrawals) | $200, when you withdraw it | "a NanoCorp managed stripe account," until you withdraw (FAQ) |
| Cofounder | None stated: its terms say it does "not receive, hold, or transmit Customer funds" (terms) | $0 | Your own Stripe account (payments) |
| Durable | None: "Durable does not add additional fees" (payment fees) | $0 | Through Stripe: "Durable uses Stripe to process payments" |
Three more facts from the same pages. Polsia's terms say "Stripe's processing fees apply in addition to Polsia's platform fee," and its help center says new checkouts through a Mexican or Brazilian Stripe Connect account have no Polsia fee. NanoCorp's withdrawals page says "The remaining 80% is sent to your Stripe account."
Sintra and Marblism build websites that don't take payments themselves, so neither keeps a fee on your sales. Sintra's help center says its website "will not be a full eCommerce platform yet" (website builder), and Marblism's website builder adds "links and buttons to your store checkout, payment or booking page" elsewhere (Walter). The store or checkout you use sets its own fees.
What $1,000 of sales leaves you
Say your customers pay $1,000 in a month. Stripe's processing fee comes out first in every case. Then:
- Polsia keeps $30, and each payment becomes available to pay out after its 31-day settlement period. Its terms give the reason: "This settlement period protects against chargebacks and fraud."
- NanoCorp holds the sales in your business's balance. When you withdraw the $1,000, it keeps $200 and sends $800 to your Stripe account.
- Foundable, Cofounder and Durable keep nothing. With Foundable, payouts are yours to manage in your own Stripe account (Terms).
Fees on ads they run for you
Some of these products also run ads for you from their own ad account and charge for it. Foundable does too, so ours is listed beside theirs:
- Foundable Ads keeps 20% of each campaign's total: a $20 campaign is $16 of ads and a $4 fee. Ted's campaign shows its total "with the Foundable fee shown apart" before you approve it (Foundable Ads).
- Polsia runs ads from its own account, "not your personal advertising account," and spends "up to your configured budget on advertising, inclusive of an applicable platform fee (currently 20% of your budget)" (terms, section 3).
- Cofounder charges "Ad spend + 10% ($100 of ads uses $110)" (pricing).
Questions
Does Foundable take a cut of my sales?
No. Your customers pay into a Stripe account in your name. Foundable isn't the seller and takes no fee on your sales; Stripe charges its own (Terms).
Which AI business builders take a percentage of my sales?
Of the products compared here, Polsia keeps 3% of each customer payment and NanoCorp keeps 20% of each withdrawal. Foundable, Cofounder and Durable add no fee of their own.
Why does Polsia make payments wait 31 days?
Polsia's terms say "This settlement period protects against chargebacks and fraud," and they set no minimum payout and no monthly cap (terms, section 4).
Does Foundable charge a fee on ads?
Yes, on campaigns it runs for you from its own ad account: 20% of the total you approve, shown apart before you approve it.
How do I move my business to Foundable?
Tell Ted your website's address, and he brings it over. Switch to Foundable shows the steps.
Further reading: Is Polsia worth it?, Foundable vs Polsia and Polsia alternatives. To create an account, get started.