Finance & Billing$20K-100K MRRMedium competition3-6 Monthsnew

RailSwap

Keep billing running when your payment processor cuts you off

Calculate Market Size Founder Fit Assessment Back to All Ideas

● The Problem

A single processor account is a single point of failure for all revenue. PayPal blocked GrapheneOS this week, and on 29 August 2026 Google Play told AnkiDroid its Open Collective donation link violates the payments policy. Moving a live subscription book to a second processor takes weeks because card tokens, plans, and webhooks are all processor-shaped.

● The Solution

A billing layer that keeps customer, plan, and subscription state in your own database and treats Stripe, Paddle, and Adyen as interchangeable rails. Cards are vaulted with a network token so a switch does not force customers to re-enter details. When one processor freezes an account, you point traffic at the standby rail and keep charging.

Key Signals

MRR Potential

$20K-100K

Competition

Medium

Build Time

3-6 Months

Search Trend

rising

Market Timing

PaymentKit launched on Product Hunt on 25 August 2026 selling billing infrastructure built to survive a processor shutdown. The same week, a Tell HN about PayPal blocking GrapheneOS reached 516 points and the AnkiDroid payments policy thread reached 896 points with 271 comments.

MVP Feature List

1Processor-agnostic subscription and plan model
2Network tokenization so cards survive a rail switch
3Dual-rail routing with automatic failover on decline spikes
4Webhook normalization across Stripe, Paddle, and Adyen
5Charge and invoice history in a processor-neutral schema
6Account-freeze runbook with one-click cutover
7Cross-rail reconciliation dashboard

Suggested Tech Stack

TypeScriptPostgreSQLTemporalStripe APIPaddle API

Go-to-Market Strategy

Lead with a free processor risk audit that scores how much of a business stops collecting if its main account freezes tomorrow. Publish the migration guides nobody writes, starting with Stripe to Paddle with live subscriptions. Target indie publishers and open source projects already burned by a store policy.

Target Audience

SaaS FoundersIndie App PublishersOpen Source Maintainers Selling SupportRevOps Leads

Monetization

SaaS Subscription

Competitive Landscape

Chargebee and Recurly abstract billing logic but still assume one primary gateway and hold the card vault themselves. Stripe Billing has no reason to make itself replaceable. PaymentKit launched into the same problem in August 2026, which proves the demand without owning the category.

Why Now?

Platform enforcement got faster and less negotiable in 2026. Google Play, PayPal, and the app stores act on automated policy signals while appeals still take weeks. Revenue continuity turned into an engineering requirement rather than a legal one.

Tools & Resources to Get Started

Churn Calculator Market Trends

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Full-stack MVP app

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Frequently Asked Questions

What problem does RailSwap solve?

How much MRR can RailSwap generate?

RailSwap has $20K-100K MRR potential with a SaaS Subscription model. The estimated build time is 3-6 Months with Medium competition in the market.

What are the MVP features for RailSwap?

Processor-agnostic subscription and plan model. Network tokenization so cards survive a rail switch. Dual-rail routing with automatic failover on decline spikes. Webhook normalization across Stripe, Paddle, and Adyen. Charge and invoice history in a processor-neutral schema. Account-freeze runbook with one-click cutover. Cross-rail reconciliation dashboard.

What is the go-to-market strategy for RailSwap?

Who is the target audience for RailSwap?

The primary target audience includes SaaS Founders, Indie App Publishers, Open Source Maintainers Selling Support, RevOps Leads. Platform enforcement got faster and less negotiable in 2026. Google Play, PayPal, and the app stores act on automated policy signals while appeals still take weeks. Revenue continuity turned into an engineering requirement rather than a legal one.

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