battles / Payments
Primer vs SellersFi
Primer ($1,500/mo/mo, vibe code 3/10) vs SellersFi ($500/mo/mo, vibe code 3/10). Primer is the easier one to rebuild yourself — here is what you lose either way.
Payments
$1,500/mo/mo
- MVP
- 2-3 weeks
- Full replacement
- 12-24 months, due to PCI-DSS Level 1 compliance requirements, universal card vaulting, and maintaining dozens of PSP integrations.
easier to rebuild
get the build prompt →Payments
$500/mo/mo
- MVP
- 1 week (dashboard only)
- Full replacement
- Impossible (requires banking partner network, lending licenses, and capital balance sheet)
price gap / year
$12,000/mo
running both / year
$24,000/mo
our call
Start with Primer — highest vibe code, weakest moat.
Primer
Building basic logic to failover between Stripe and Adyen in Node.js takes a few days. However, Primer provides PCI-DSS Level 1 card vaulting, 3DS2 orchestration, unified tokenization, and dozens of pre-built payment connectors. Replacing Primer with custom code creates massive regulatory and engineering overhead.
you can rebuild
- Basic conditional payment routing (if Gateway A fails, try Gateway B)
- Rule-based PSP selection by buyer currency or country
- Basic payment transaction logging and status dashboard
- Dynamic surcharge calculations based on payment method
- Centralized webhook aggregation for payment status events
what you lose
- PCI-DSS Level 1 compliant card tokenization vault
- Pre-built integrations for 100+ PSPs, BNPLs, and alternative payment methods
- Native 3DS2 (Strong Customer Authentication) flow orchestration across gateways
- No-code visual drag-and-drop payment workflow automation editor
- Unified financial reconciliation and automated payout matching across processors
real moats
- PCI-DSS Level 1 security architecture and ongoing audit compliance
- Universal card vaulting and token format translation between legacy gateways
- Battle-tested maintenance of dozens of volatile payment processor APIs
open source escape hatches
- Hyperswitch Apache-2.0
- Kill Bill Apache-2.0
- Active Merchant MIT
SellersFi
SellersFi is an asset-backed financial platform providing balance-sheet capital, underwriting models, and banking infrastructure. While building a dashboard to aggregate store metrics takes a few days, an AI agent cannot extend capital, assume default risk, or satisfy money transmitter regulations.
you can rebuild
- Revenue and cash flow visualizer dashboard
- Shopify, Amazon, and Walmart API sales data fetcher
- Payout schedule and sales velocity tracker
- Working capital estimate calculator
- Historical revenue versus expense reporting
what you lose
- Direct revenue-based working capital advances
- FDIC-insured digital business bank accounts
- Multi-currency conversion and international transfer rails
- Automated credit underwriting and credit lines
- Corporate credit cards with cashback programs
real moats
- Access to debt funding and capital reserves to execute financing
- Regulatory compliance licenses, AML/KYC protocols, and banking sponsor agreements
- Proprietary risk assessment models derived from historical merchant default data
open source escape hatches
- Formance Ledger Apache-2.0
- Firefly III AGPL-3.0
- Midaz Apache-2.0
Questions people ask
Which is easier to rebuild with AI, Primer or SellersFi?
Primer. It scores 3/10 on vibe code with a moat of 6/10, so an AI-assisted MVP takes about 2-3 weeks and a full replacement about 12-24 months, due to PCI-DSS Level 1 compliance requirements, universal card vaulting, and maintaining dozens of PSP integrations..
Which one costs less, Primer or SellersFi?
SellersFi at $500/mo/mo for a typical mid-market store. The gap between the two is about $12,000/mo a year.
What do I lose if I replace Primer?
PCI-DSS Level 1 compliant card tokenization vault Pre-built integrations for 100+ PSPs, BNPLs, and alternative payment methods Native 3DS2 (Strong Customer Authentication) flow orchestration across gateways
What do I lose if I replace SellersFi?
Direct revenue-based working capital advances FDIC-insured digital business bank accounts Multi-currency conversion and international transfer rails
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