Stripe MCPhttps://stripe.comStripe's official MCP. T3rnel WavePayhttps://github.com/t3ratech/t3rnelPayment authority (sibling product; PayNow-first). PayNowhttps://paynow.co.zwZimbabwe payment gateway. PayPalhttps://developer.paypal.comPayments + payouts API. Stripehttps://stripe.comPayments infrastructure. Lemon Squeezyhttps://lemonsqueezy.comMerchant-of-record for digital products. x402 paying agent (awesome-llm-apps)https://github.com/Shubhamsaboo/awesome-llm-apps/tree/main/starter_ai_agents/ai_x402_paying_agentExample: agent that pays via x402.