The Margin  /  Payments Intelligence

The fee you can't
see is the one
you pay for.

Defensible, data-rich analysis of card acceptance โ€” interchange, routing, dual pricing, chargebacks โ€” written for the people who actually read the statement.

Published by MidPay Numbers cited or modeled โ€” never invented 6 briefings
Lead briefing ยท Cost structure

Where your effective rate actually goes

You pay one blended number every month. It is built from three very different layers โ€” interchange, assessments, processor markup โ€” and only one of them is negotiable. The fee waterfall, in basis points.

9 min readยทCost structureยทRead the breakdown โ†’

The briefings

Every number is cited to a public source or framed as an illustrative model. No invented statistics.

Pricing models

Interchange-plus vs flat rate: which actually costs less

One model bundles your markup into a single number; the other exposes it. Which wins depends entirely on your card mix.

8 min readRead โ†’
Cost structure

How to read your merchant statement, line by line

Find your true effective rate, separate interchange from negotiable markup, and spot the junk fees padding the bottom.

9 min readRead โ†’
Pricing models

Tiered pricing: the most expensive model you've never audited

The processor decides which bucket each sale lands in โ€” and your reward cards quietly get downgraded into the costly one.

7 min readRead โ†’
Cost structure

Your card mix is the biggest lever you're not pulling

Debit, credit, rewards, and corporate cards carry wildly different interchange. Shifting the mix moves your rate more than any negotiation.

8 min readRead โ†’
Junk fees

Gateway, statement, batch: the recurring junk-fee audit

A 15-minute pass through the line items that bloat every statement โ€” and which ones you can waive, shrink, or kill outright.

7 min readRead โ†’
Junk fees

PCI "compliance" fees: the junk line in your statement

Real PCI compliance is a questionnaire. The monthly "PCI fee" is something else โ€” and it's often removable.

6 min readRead โ†’
Benchmarks

Effective-rate benchmarks by industry: where you should land

Restaurants, retail, salons, healthcare, and e-commerce land at very different rates โ€” for reasons rooted in card mix and ticket size.

8 min readRead โ†’
Cost structure

The 10-cent problem: why small tickets get crushed on fees

On a $4 sale, the fixed per-transaction fee dwarfs the percentage. The math that quietly punishes coffee shops and food trucks.

6 min readRead โ†’
Cost structure

Card-present vs card-not-present: the rate gap nobody explains

Keyed and online transactions carry higher interchange and fraud risk. How an omnichannel business ends up with a blended rate โ€” and how to cut it.

7 min readRead โ†’
Cost structure

The true cost of accepting Amex (and when it's worth it)

OptBlue narrowed the gap for smaller merchants. The accept-or-decline decision comes down to your average ticket and your clientele.

7 min readRead โ†’
Cash flow

Same-day vs next-day funding: what faster deposits are worth

Batch cutoffs, settlement timing, and the real working-capital value of getting your money a day sooner.

7 min readRead โ†’
Payment methods

ACH vs cards: when bank transfers quietly beat plastic

Flat per-transaction pricing makes ACH a quiet winner on large-ticket B2B and recurring billing โ€” with tradeoffs worth knowing.

8 min readRead โ†’
Operations

How to switch processors without a day of downtime

The parallel-run migration checklist โ€” from spotting the cancellation traps to reconciling your first batches before you cut over.

8 min readRead โ†’
Compliance

Surcharging legally in 2026: the state-by-state rules

Network caps, disclosure and registration, the no-debit rule, and a state landscape that keeps shifting โ€” what to verify before you switch it on.

9 min readRead โ†’
Regulation

The debit routing lever most founders ignore

Durbin mandates two networks per debit card. Least-cost routing picks the cheaper path โ€” and on a debit-heavy business, the cents compound.

8 min readRead โ†’
Compliance

Cash discounting vs. surcharging in 2026

Two programs, two rulebooks. The compliance lines, the 3% credit cap, and the margin math behind shifting card cost to the card.

10 min readRead โ†’
Equipment

Your "free" terminal's 36-month TCO

Nobody gives away hardware. A line-by-line teardown of the lease, PCI, and early-termination fees hiding inside "free."

7 min readRead โ†’
Risk & ops

Chargebacks as a hidden tax

A dispute isn't a refund โ€” it's a refund plus a fee plus staff time plus account risk. The economics at scale, and the mitigation ROI.

8 min readRead โ†’
Strategy

Dual pricing and the path to ~0% processing

"Zero fees" is a real outcome and an overused slogan. The honest mechanics, where it's allowed, and the founder's rollout playbook.

9 min readRead โ†’
Cost structure

Where your effective rate actually goes

The lead briefing, in full: the three-layer fee stack, why "interchange discounts" don't exist, and the only line you can move.

9 min readRead โ†’

The statement most founders
never get to read.

One briefing at a time, in plain numbers. Interchange, routing, dual pricing, chargebacks โ€” what they actually cost and how to move them.

Written for founders of $5M+ businesses. No spam, no fluff. Unsubscribe anytime.