Launching today
FeeFlow
Stop losing margins to hidden payment fees. Compare & save
1 follower
Stop losing margins to hidden payment fees. Compare & save
1 follower
FeeFlow is an ad-free, 0-lag payment fee engine for freelancers, merchants, and SaaS founders. Calculate exact 2026 fees for Stripe, PayPal, Square, Braintree, and Wise across 46 countries. Features reverse gross-up math (so you net 100% of your invoice), domestic vs cross-border interchange, micropayments, and client-ready payout breakdowns. Open-source, privacy-first, and ultra-fast.
Hey Product Hunt! I’m Mihir, creator of FeeFlow.
Payment processors quietly eat 3% to 7% of your revenue through cross-border card markups, hidden FX spreads, and regional taxes. You bill $5,000 expecting $5,000, and end up pocketing $4,680.
Existing fee calculators online are bloated 2018 relics packed with spammy display ads, slow scripts, and outdated 2.9% flat rates.
So I built FeeFlow: a fast, ad-free payment fee intelligence engine across 536+ dedicated pages.
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### Why There Is ZERO "AI" in FeeFlow (And Never Will Be)
In 2026, everyone slaps a generic LLM wrapper on everything. For financial calculations, that is dangerous.
1. The LLM "Denomination Trap": Ask ChatGPT how much to invoice to pocket $100 after a 2.9% + 30¢ fee. It blindly adds 2.9% to 100 ($103.20), leaving you short on your payout ($99.91). It fails basic algebraic inversion: (Target + Fixed) / (1 - Rate) = $103.30.
2. Hallucinated Caps: LLMs routinely miss non-linear tariff ceilings (e.g., claiming a $20k Stripe ACH transfer costs $160 instead of the statutory $5.00 cap).
3. Determinism Matters: Money math must be 100% deterministic. FeeFlow runs pure, closed-form algebraic formulas compiled to the client edge. Zero hallucinations, exact to the single cent.
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### What FeeFlow Does (Cut to the Point):
- Target Reverse Gross-Up: Enter what you want to pocket (e.g., exactly $5,000). Get the exact amount to bill so you never absorb processor cuts.
- 536 Global & Creator Rails: Stripe, PayPal, Square, Polar.sh, Lemon Squeezy, Whatnot live auctions, Beehiiv vs Substack, Wise FX, and Cashfree (with 18% GST Input Tax Credit recovery).
- 48 Localized Countries: Native handling of regional rules: Brazil Pix, Canada Interac, Mexico SPEI, Saudi Arabia Mada, Sweden Swish, and EU SEPA caps.
- Universal 9.8K+ Query Directory (/directory): Instant search answering the fine-print payment questions gateways bury in 50-page PDFs.
- Client-Ready PDF Fee Receipts: Generate itemized statements with 1 click to transparently justify grossed-up invoices to enterprise clients.
- Respect for Users: 100% Free forever. 0 Ads, 0 Tracking cookies, 0 Sign-ups. Sub-100ms loading.
Test FeeFlow with your next client invoice or SaaS plan. Challenge our math, and let me know: which regional payment rail should we add next?
Thank you for your support!