Content Credits SDK vs Milkie

Content Credits SDK lets publishers charge for individual premium articles while giving readers a way to pay only when they want access. Readers use one account and wallet across participating publishers, without a monthly subscription. The SDK can keep paid content hidden until a reader pays the article’s credit price, then reveal it without a page reload. Readers buy credits using credit cards or digital wallets; PayPal processes payments, and Content Credits says it does not store payment details. Publishers choose article prices and access rules and can use the service alongside an existing paywall. Integration options include a WordPress plugin, JavaScript SDK, npm package, and custom paywalls; named supported stacks include WordPress, custom CMSs, Next.js, React, and Vue. Publisher tools cover reader behavior and article performance, with features intended to encourage longer visits and deeper scrolling. Publisher participation is free, but Content Credits takes a percentage of micropayments; payouts are monthly with detailed reports. Credits have no cash value, are non-refundable and non-transferable, and may expire after 12 months of inactivity.

Milkie is a paywall SDK for Next.js apps, provided free and licensed under MIT. Developers use its PaywallGate component to protect whole sections or selected components, so a page can contain both free and subscription-only material. A metered setup can grant visitors a limited amount of free access each month. For content that requires sign-in but not a subscription, Milkie describes an AuthGate component. It works with Stripe: users go to Stripe's hosted checkout, and webhooks update subscription status in real time. The maker's README lists support for NextAuth, Clerk, Lucia, Supabase, and other authentication providers, as well as customization of paywall interfaces, messages, and styling. Listed protections include callback URL validation, idempotency keys, PII sanitization, webhook signature verification, and email normalization. Setup calls for three API routes covering subscription status, checkout, and Stripe webhooks. Multi-tenancy, a developer dashboard, a webhook relay, and multiple subscription tiers are roadmap items.