v2: Clean up paywall

[apmcdermott]

Clean up paywall package and remove Coinbase Onramp integration

Summary

This PR simplifies the paywall package by removing the unified paywall in favor of network-specific paywalls (EVM and SVM), removes the Coinbase Onramp integration, and updates the build process to generate templates for all supported languages.

Changes

Paywall Architecture

• Removed the unified paywall.ts and build.ts in favor of separate EVM and SVM paywall implementations
• PaywallBuilder.build() now requires explicit network handlers via .withNetwork() and throws an error if none are registered
• Removed legacy getPaywallHtml export from the package

Coinbase Onramp Removal

• Removed cdpClientKey and sessionTokenEndpoint from PaywallConfig across TypeScript, Python, and Go
• Deleted useOnrampSessionToken hook and utils.ts containing generateOnrampSessionToken
• Removed "Buy USDC" button from EvmPaywall component
• Removed WalletConnect connector from Providers (keeping injected and Coinbase Wallet only)

Cross-Language Template Generation

• EVM and SVM build scripts now generate templates for Python (evm_paywall_template.py, svm_paywall_template.py) and Go (evm_paywall_template.go, svm_paywall_template.go)
• Python paywall module updated to select the appropriate template based on network prefix (solana: uses SVM, others use EVM)
• Deleted the legacy combined paywall.html template from Python

Other Improvements

• Moved Spinner component animation to CSS stylesheet
• Added margin to CTA container for better spacing
• Removed component exports (EvmPaywall, SolanaPaywall) from network handler modules
• Updated tests to remove references to deleted config options

Checklist

• [x] I have formatted and linted my code
• [x] All new and existing tests pass
• [x] My commits are signed (required for merge) -- you may need to rebase if you initially pushed unsigned commits

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Project	Deployment	Preview	Comments	Updated (UTC)
x402	Ready	Preview	Comment	Dec 3, 2025 6:40pm