Validly - One validation API
Validly solves the micropayment problem for API-based validation services. Traditional blockchain payment systems are too expensive for sub-dollar transactions due to gas fees that often exceed the payment amount itself. Our validation API calls range from $0.003 (email verification) to $0.95 (identity check), making standard blockchain payments economically unviable. I built Validly to demonstrate how Circle's payment infrastructure enables an entirely new class of micropayment-powered applications. By combining Circle Developer Controlled Wallets, Circle Gateway x402 nanopayments, and Arc testnet settlement, we created a production-ready platform where every API call is charged in real-time with USDC, settled in under a second, and fully auditable on-chain.
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"Pros: Circle + Arc integration is very strong: explicit use of Developer Controlled Wallets, x402 nanopayments, sub-cent pricing, and real-time on-chain settlement on Arc with full auditability. Clear explanation of why high-frequency micropayments only become viable on Arc’s low-cost, stablecoin-native design. Creates a practical usage-based economic model for API services that would otherwise require subscriptions or centralized billing. Cons: No mention of autonomous agents or true machine-to-machine flows - the model is pay-per-API-call rather than agentic. High-frequency usage (50+ transactions) and real testnet transaction evidence are not shown or quantified. Lacks details on a working demo flow or verifiable on-chain examples beyond the high-level description."
Anton Kiselev
Lead Backend Developer
For Innovators & Creators