Mercury and Relay are the two startup-and-SMB banking platforms a US creator most often weighs after the corporate-card names, and they split on commission structure and audience. Mercury ranks #6 (grade B−, $4.78 EPC) on a lifetime-revshare model tied to a high-LTV VC-startup user base. Relay ranks #2 (grade B+, $6.56 EPC) on a tiered $50–$300 CPA plus advisor-partner revshare, a genuine Profit First product moat, and a far cleaner reputation. Both run a 90-day cookie — the longest publicly published window in the US cohort. This head-to-head decodes which to feature. FintechPays earns a commission where a programme is live; it does not move the rank, which is set by a quality-and-economics composite.
The one-line verdict
Feature Relay for accountant-channel and Profit First content — it earns the higher EPC, carries a clean 4.2 reputation, and its multi-account architecture is a real editorial hook. Feature Mercury for VC-startup audiences — its lifetime revshare on a high-LTV user base compounds over years — but address the 2.6 Trustpilot and the opaque revshare tiers honestly. The split is accountant-channel CPA (Relay) versus VC-startup lifetime revshare (Mercury).
Commission structure — CPA-plus-revshare vs lifetime revshare
The two monetise differently. Relay pays a tiered $50–$300 CPA plus 5–10% revshare for advisor partners — a structure that rewards repeat-volume accountant channels with an immediate per-conversion payout and a recurring tail. Mercury pays up to 25% corporate or 5% individual lifetime revshare on Mercury’s earnings from the referred customer, which is the higher-ceiling structure and compounds on a high-LTV VC-startup base — a 2025 referral can still be paying in 2027. The honest read on the EPC: Relay’s $6.56 tops Mercury’s $4.78 on typical traffic because the tiered CPA converts reliably and immediately, while Mercury’s lifetime model — though higher-ceiling — depends on the referred startup actually generating Mercury earnings over time, and the 5%/25% spread hinges on undocumented corporate-vs-individual criteria that make it opaque to model. Relay is the steadier, better-documented earner; Mercury is the higher-ceiling bet on startup LTV.
Reputation — a real gap to address
Reputation separates them more than the economics do. Relay’s Trustpilot sits at 4.2/5; Mercury’s at 2.6/5 across roughly 1,500 reviews. That is a real gap an affiliate must address — recommending Mercury without acknowledging the 2.6 undercuts credibility, and a low score produces more support-driven churn and regretful replies. Relay is the safer recommendation on reputation. Mercury’s score reflects real user friction that affiliate copy has to handle honestly rather than paper over; its VC-startup brand strength is genuine, but the satisfaction signal is weak.
Product moats and audience fit
Both have real product differentiation, pointed at different readers. Relay’s Profit First multi-account architecture — native support for the cash-management methodology — is a genuine moat that translates directly into editorial differentiation and converts strongly with the accountant and bookkeeper channel that teaches Profit First. Mercury’s moat is its VC-startup positioning — checking plus treasury built for funded startups, the highest-LTV user base on the leaderboard. The audiences barely overlap: Relay fits accountant-channel, small-business, and Profit First content; Mercury fits funded-startup and founder content. One boundary on each: Relay has no corporate-card depth, so it doesn’t convert for spend-management-focused content (route that to Ramp or Brex), and Mercury’s lifetime upside only materialises on genuinely high-LTV startup referrals.
A note on access friction
One practical difference for creators: Relay’s published affiliate rates are locked behind a 30-minute onboarding call, which adds friction for casual creators (though it suits committed accountant-channel partners). Mercury’s programme is more self-serve. For a creator testing the water, Mercury is easier to start; for an established accountant-channel property, Relay’s onboarding is worth the call for the tiered CPA.
Which should you choose?
| Your priority | The pick |
|---|
| Higher EPC on typical traffic | Relay — $6.56 vs $4.78 |
| Accountant-channel / Profit First content | Relay — multi-account moat |
| Reputation safety | Relay — 4.2 vs Mercury’s 2.6 |
| VC-startup / founder audience | Mercury — high-LTV user base |
| Lifetime-revshare ceiling | Mercury — pays for years on LTV |
| Self-serve, low-friction start | Mercury — no onboarding-call gate |
For US creators: match the structure to your channel
These two reward channel-matching rather than a single pick. If your audience is the accountant, bookkeeper, and small-business-owner channel — the readers who respond to cash-management methodology and want an immediate, documented payout — Relay is the anchor: higher EPC, clean reputation, a Profit First moat that writes its own content angle, and a CPA-plus-revshare structure that rewards repeat-volume partners. If your audience is funded founders and the VC-startup ecosystem, Mercury’s lifetime revshare on a high-LTV base is the higher-ceiling play, because a single referred startup can pay out for years as it grows — provided your copy handles the 2.6 reputation and the opaque tier criteria honestly. A creator serving both audiences can run both, leading with Relay in accountant-channel content and Mercury in founder content; one serving a single channel should pick the structure that matches how their readers actually bank. The discipline is to match payout structure to audience LTV — immediate CPA for the steady small-business converter, lifetime revshare for the high-growth startup.
Common questions
Is Mercury or Relay better for an affiliate?
Relay on typical traffic — higher EPC, a clean 4.2 reputation, and a documented CPA. Mercury is the higher-ceiling bet for VC-startup audiences via lifetime revshare, but its reputation (2.6) and opaque tiers need honest handling.
Why is Mercury’s Trustpilot so low?
Mercury’s 2.6/5 across ~1,500 reviews reflects real user friction; any content featuring it must address that honestly rather than lead on the VC-startup brand alone. Relay’s 4.2 is the safer reputation.
Which converts for spend-management content?
Neither, really — Relay has no corporate-card depth and Mercury is checking-and-treasury-led. For spend-management and corporate-card content, route to Ramp or Brex.
Can I start with either quickly?
Mercury is more self-serve; Relay locks published rates behind a 30-minute onboarding call. For a quick start, Mercury; for a committed accountant-channel partnership, Relay’s call is worth it.
The bottom line
Mercury and Relay answer the startup-and-SMB banking question differently. Relay is the accountant-channel pick — higher EPC, a clean reputation, a Profit First moat, and a documented tiered CPA — for accountant, bookkeeper, and small-business content. Mercury is the VC-startup pick — lifetime revshare on a high-LTV founder base — for funded-startup audiences, provided the 2.6 reputation and opaque tiers are disclosed. Lead with Relay for accountant-channel and Profit First content, Mercury for founder audiences, route spend-management readers to the corporate-card names, and match the payout structure to how your audience actually banks.