For US e-commerce, 4 structural picks.

This sub-pillar is for US-incorporated e-commerce operators: Shopify / Amazon / Etsy / WooCommerce sellers + DTC brands with inventory-driven cash flows. The structural decision diverges from SaaS startups in three ways. First, sub-account architecture matters — inventory pre-orders, sales-tax holdbacks (across 20+ US states), marketing-campaign budgets, supplier deposits, and gross-margin reserves each warrant separate buckets. Second, high-APY checking on the operating balance often beats Treasury-yield products for sub-$2M operators because the operating balance is the structural cash sink (no idle-cash-above-payroll pattern). Third, marketplace-native integrations compress the reconciliation friction from weekly to daily — Novo + Shopify + Stripe + QuickBooks is the structural fit for sellers under $1M revenue.

Bluevine ranks first for SMB operators with operating-balance cash management as the structural problem — the 2% APY on qualifying checking activity is structurally distinct from Treasury yield (deposit product, FDIC pass-through to $3M via Coastal Community Bank sweep). Relay ranks second for any e-commerce operator running Profit First methodology or sales-tax-collecting businesses — up to 20 sub-accounts under one login is unique in the category. Mercury ranks third for DTC brands above $2M revenue where the operating-plus-inventory cash position calls for the $5M IntraFi sweep + Treasury yield split. Novo ranks fourth for under-$1M Shopify / Etsy sellers where the native marketplace integration set (Shopify, Stripe, QuickBooks, Xero, Sage, Etsy) is the deciding factor.

What is the structural fit for a Shopify / Amazon / Etsy seller?

Novo for the operating account, paired with the marketplace's native payout rail. Novo ships native Shopify, Stripe, QuickBooks, Xero, Sage, and Etsy integrations — the deepest e-commerce integration set among US business neobanks at the under-$1M revenue tier. The operational pattern: route marketplace payouts (Shopify Payments, Amazon Pay, Etsy) directly to the Novo Conta PJ, reconcile via QuickBooks integration, and route inventory expenses + COGS to a separate Novo Reserve sub-account for cash-flow visibility. For DTC brands above ~$2M revenue, the structural fit shifts toward Mercury (operating account + Treasury yield) or Bluevine (high-APY checking) — Novo's seller-tier features matter less at scale.

Why does sub-account count matter for e-commerce?

Inventory businesses run materially more complex cash flows than pure-service businesses — separate buckets for inventory pre-orders, sales-tax holdbacks, marketing-campaign budgets, supplier deposits, and gross-margin reserves are operationally necessary for any e-commerce operator running multi-vendor inventory. Relay ships up to 20 sub-accounts under one login, which is structurally distinct from Mercury (1 main + 1 Vault sweep), Bluevine (1 main + standard savings), or Novo (1 main + 5 Reserves). For an e-commerce operator running "Profit First" methodology or a sales-tax-collecting business across 20+ states, Relay's sub-account architecture is the deciding factor.

How does the 2% APY on Bluevine checking work?

Bluevine offers up to 2.0% APY on operating-balance checking (verify the current rate — APY tracks short-term US rate moves) on qualifying activity, which is structurally different from Mercury or Brex where idle-cash yield routes through Treasury / Cash Management investment products. The qualifying-activity threshold for the Bluevine APY typically requires monthly debit-card activity or a minimum monthly deposit; verify the current activity requirements in the Bluevine terms. The APY is on a deposit product, not an investment product — FDIC pass-through cover via Coastal Community Bank up to the standard $3M sweep ceiling Bluevine maintains.

Are Shopify Capital and Mercado Pago Crédito alternatives for working capital?

Yes. For Shopify-routed sellers, Shopify Capital provides revenue-based lending underwritten on platform sales data — same underwriting model as Mercado Pago Empresas in LATAM markets and increasingly the structural alternative to traditional bank lending lines for e-commerce SMBs. Stripe Capital is the equivalent for Stripe-routed sellers. The Bluevine Line of Credit (a separate Bluevine product) is the bank-style working-capital alternative — typical credit lines of $5K-250K with rates that vary by underwriting profile. For the typical Shopify operator, the platform-native lending route (Shopify Capital + Stripe Capital) is often faster and cheaper for sub-$100K working-capital needs.

What is the recommended operating-cash structure for a DTC e-commerce brand?

For DTC brands above $2M revenue: Mercury as the operating account ($5M IntraFi sweep + Treasury for above-sweep idle cash) plus Ramp as the corporate-card + spend layer is the most-common pattern. The IntraFi sweep covers the operating cash, Treasury yields on inventory-pre-order capital, and Ramp covers vendor / supplier / marketing-spend management. Smaller DTC brands ($200K-2M revenue) often run Bluevine for the high-APY checking on operating cash plus a Shopify Capital / Stripe Capital relationship for inventory working capital. The structural distinction: Bluevine's 2% APY on operating cash is a direct equivalent to Mercury Treasury, but on a deposit product rather than an investment product — simpler structural model at the cost of a lower headline yield.

For under-$1M Shopify / Etsy sellers, Novo is the structural fit — native marketplace integrations are the deciding factor at this tier and the operating-account UX is built around the marketplace-payout reconciliation workflow. For SMB operators where high-APY checking on the operating balance is the structural problem, Bluevine at 2% APY on a deposit product. For any operator running Profit First methodology or sales-tax-collecting across multi-state, Relay with up to 20 sub-accounts. For DTC brands above $2M revenue with inventory pre-order capital and treasury allocation, Mercury with the $5M IntraFi sweep + Treasury yield split. Pair the operating-account leg with Ramp for the corporate-card + spend-management surface once vendor count exceeds ~10 — the structural pattern is the same as the SaaS-startup sub-pillar.