I've been building Spraay — a multi-chain payment gateway where AI agents pay per API call using the x402 protocol and USDC on Base. 88 endpoints across AI inference, batch payments, DeFi, oracle data, escrow, robotics, and more. The x402 model works great for crypto-native developers and autonomous agents. But I kept hearing the same thing from traditional devs: "This looks useful, but I don't want to set up a wallet and buy USDC just to test your API." Fair point. So today I'm launching a traditional subscription tier alongside x402 — pay with a credit card, get an API key, start building. Two Ways to Use Spraay Pay-per-call (x402) — No signup. Your agent pays USDC per request on Base. This is how autonomous agents use it. Prices range from $0.001 to $0.10 per call depending on the endpoint. Monthly subscription (Stripe) — Sign up with your email, pay with a card, get an API key emailed to you. Add X-API-Key to your requests and you're in.…