American Express runs a closed loop — it's the card issuer, the acquirer, and the network in one — which is why its pricing works differently from Visa and Mastercard and why it usually costs more. But "more expensive" is not a decision. The published Canadian wholesale tiers are public, the two acceptance paths are documented, and the accept-or-decline math takes five minutes. Here's all of it.
How Amex pricing works in Canada: two paths
Per American Express Canada's own merchant pricing page, you have two options:
1. Direct with American Express. You contract with Amex directly; services and settlement come from Amex. You pay a single Discount Rate — one percentage of the purchase price — for all Amex credit and charge cards. Simple, but the rate is set by Amex.
2. Through an OptBlue participant. Your existing payment processor handles Amex alongside Visa and Mastercard under the OptBlue program. The rate is set by your processor (with their markup), and — this is the key point — businesses processing under US$1 million annually in Amex volume qualify for OptBlue, which covers virtually every small business in Canada.
Most Canadian small merchants are on path 2 without realizing it: Amex just shows up as another line on the processor statement. Amex also notes it supports the Code of Conduct for the Payment Card Industry in Canada — the same rules that govern your Visa/Mastercard relationship.
The published wholesale tiers
These are the OptBlue wholesale discount rates from TD's published Canadian interchange schedule (April 2025) — the floor your processor builds on:
| Merchant category | Tier 1 (smaller tickets) | Tier 2 (larger tickets) |
|---|---|---|
| Restaurant | 1.60% (≤ $200) | 2.40% (> $200) |
| Retail | 1.60% (≤ $500) | 2.00% (> $500) |
| Services | 1.60% (≤ $500) | 2.00% (> $500) |
| B2B / Wholesale | 1.60% (≤ $1,000) | 2.00% (> $1,000) |
| Travel & Entertainment | 1.60% (≤ $1,000) | 2.40% (> $1,000) |
| Healthcare | 1.34% flat | |
Three adjustments sit on top of these: card-not-present adds 0.30% to every credit Amex transaction (phone and online orders), USD settlement wholesales at 2.20%, and foreign-issued cards run 2.00–2.90% depending on the combination. A May-2026 published wholesale schedule confirms the same structure: Tier 1 electronic 1.60% / card-not-present 1.90%, Tier 2 electronic 2.00% / card-not-present 2.30%.
Your processor's markup goes on top of wholesale — Stripe's Amex guide puts typical all-in merchant discount rates at 1.43%–3.3%. Ask your processor what their Amex markup is, in writing; on OptBlue it should be a small, explicit number.
The accept-or-decline math
Worked example: a restaurant does $200,000/year in card sales, and 10% of it ($20,000) comes on Amex. At the 1.60% wholesale rate plus a typical small processor markup, the all-in Amex cost lands around 1.9% — about $380/year. The same $20,000 on Visa/Mastercard at ~1.5% would cost about $300. The Amex premium: roughly $80/year.
Now the other side of the ledger: what does declining Amex cost? Amex cardholders skew premium — they're the customers with high-limit rewards cards who spend more per visit. If declining Amex loses you even a handful of sales a year, the lost margin dwarfs the $80 premium. The math only favors declining when Amex volume is tiny and your customers reliably carry a second card — a combination that's rarer than merchants assume.
The premium-card reality cuts both ways: Amex transactions cost more because the cardholder is more valuable. You're not paying extra for nothing; you're paying for access to the highest-spending card base in the country.
Decision: take Amex or not
- Take Amex if: you're in hospitality, travel, or premium retail; your average ticket is high; or corporate/expense-account customers matter to you. The premium is small relative to one saved sale.
- Take Amex via OptBlue (not direct) if: you're under US$1M in annual Amex volume — which is nearly everyone reading this. One statement, one deposit, one processor relationship.
- Reconsider if: Amex is under 2% of your card volume, your tickets are small, and your processor's Amex markup is inexplicably large — get the markup in writing first, because the problem might be the markup, not Amex.
- Never decline Amex over the wholesale rate alone. The wholesale tiers above are the floor; the decision is about lost sales, not basis points.
A note on format: this is a decision guide, not a setup walkthrough — there are no numbered steps because the decision framework above is the actionable part. If you decide to add Amex, your processor enables it; there's nothing to configure.
FAQ
What is Amex OptBlue?
The program that lets small businesses (under US$1M in annual Amex volume) accept American Express through their existing payment processor instead of contracting with Amex directly. Your processor sets the rate — including their markup — on top of Amex's published wholesale tiers.
Should a small business accept American Express in Canada?
Usually yes. The wholesale premium over Visa/Mastercard is real but small (often under $100/year for a typical small merchant), while the cost of turning away a premium cardholder is one lost sale. Decline only if Amex volume is negligible and your processor's markup is unjustifiable.
What is the American Express merchant discount rate?
The percentage of each sale Amex (or your OptBlue processor) keeps. Canadian wholesale tiers run 1.34%–2.90% depending on merchant category, ticket size, and whether the card was present; all-in merchant rates typically land between 1.43% and 3.3% after processor markup.