Payment Gateway / PSP
Stark Bank and Unit both show up under the payment gateway category, but they solve slightly different jobs. Stark Bank uses usage-based pricing, while Unit runs on custom (sales-led) pricing. Lock-in is medium for Stark Bank and high for Unit. Transparency lands at 3/5 versus 1/5. Stark Bank fits teams working on Pix payment integration for Brazilian businesses via SDK, while Unit is a closer match when the job is FDIC-insured bank accounts and ACH for US fintech startups. Worth noting: Stark Bank is explicitly not for companies outside Brazil or needing multi-country payment rails; Unit is explicitly not for Non-US teams or companies needing a plain payment gateway. The honest trade-off: Stark Bank trades off on brazil-only — no utility outside BRL; Unit trades off on sponsor bank risk post-US BaaS turbulence. On the plus side, Stark Bank highlights SDKs in 10+ languages — real DX focus, while Unit points to accounts, cards, ACH, wire, lending unified.
Quick take
Stark Bank is for Pix payment integration for Brazilian businesses; Unit is for FDIC-insured bank accounts and ACH for; decide on pricing model.
| | | |
|---|---|---|
| Category | Payment Gateway / PSP | Payment Gateway / PSP |
| Pricing Model | usage | custom |
| Entry Price | — | — |
| Free Tier | No | No |
| Billing Complexity | — | — |
| Developer Experience | 5/5 | 5/5 |
| Pricing Transparency | 3/5 | 1/5 |
| Lock-in Level | medium | high |
| Migration Complexity | — | — |
| Data Portability | — | — |
| Enterprise | — | — |
| GitHub Stars | 14 | — |
| License | MIT | — |
Choose Stark Bank if your project is Pix payment integration for Brazilian businesses via SDK, medium lock-in is an acceptable trade-off.
Not for: Companies outside Brazil or needing multi-country payment rails
Choose Unit if your project is FDIC-insured bank accounts and ACH for US fintech startups, you are prepared for a sales-led custom-pricing conversation, you are willing to accept the high lock-in called out in our data.
Not for: Non-US teams or companies needing a plain payment gateway
Check each tool's dedicated page for deeper reviews, setup notes, and pros/cons.
Stark Bank uses usage-based pricing, and Unit uses custom (sales-led) pricing. The pricing models are different, so a direct cheaper-than comparison depends on your volume and usage pattern.
Our data puts Stark Bank at medium lock-in (brazil-focused pix, sdks help portability), and Unit at high lock-in (baas partner integrations hard to migrate). Migration is feasible but not trivial — budget time for re-integration, data export, and parallel running before cutover.
Both score 5/5 on developer experience in our data, so there's no clear winner on that axis. Stark Bank does edge ahead on pricing/docs transparency (3/5 vs 1/5), which can make evaluation faster.
Unit is a reasonable alternative to Stark Bank when your workload leans more toward US fintech startups needing full-stack banking APIs with modern developer experience than brazilian fintechs and SaaS needing Pix, TED, and boleto with clean SDKs. The pricing model shifts too — Stark Bank is usage-based pricing, Unit is custom (sales-led) pricing — so expect the cost profile to change as well. One caveat: Unit is explicitly not for Non-US teams or companies needing a plain payment gateway, so check that constraint against your use-case before switching.
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