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FeeFlow
Stop losing margins to hidden payment fees. Compare & save
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.
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Existing fee calculators online are bloated 2018 relics packed with spammy display ads, slow scripts, and outdated 2.9% flat rates.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.
---
### 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.
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!
About FeeFlow on Product Hunt
“Stop losing margins to hidden payment fees. Compare & save”
FeeFlow was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #145 on the daily leaderboard. 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.
On the analytics side, FeeFlow competes within Productivity, Freelance, Fintech and GitHub — topics that collectively have 781.5k followers on Product Hunt. The dashboard above tracks how FeeFlow performed against the three products that launched closest to it on the same day.
Who hunted FeeFlow?
FeeFlow was hunted by Mihir Rana. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of FeeFlow including community comment highlights and product details, visit the product overview.
Mihir Rana
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.
---
### 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.
---
### 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!