PAYIN JOURNAL
Merchant workflows, payment protocols and the decisions behind receiving stablecoins. Original research and examples are preserved with their dates and clear product context.
The HTTP 402 payment standard gets a major upgrade. Explore unified payment interfaces, wallet-based sessions, extensible architecture, and what it means for developers building payment-enabled applications.
Read article →If your business accepts Bitcoin, adding USDC stablecoin payments solves the volatility problem while keeping crypto's benefits. Learn how to upgrade your payment options in minutes.
Read article →Learn how vacation rental hosts can accept stablecoin payments like USDC. Skip platform fees, get instant settlements, and offer guests a modern payment option with no price volatility.
Read article →Accept USDC payments at your store, market stall, or pop-up with just a phone or tablet. No hardware, no monthly fees, no merchant account required.
Read article →A clear explanation of payment gateways and payment processors - what they do, how they differ, and which one you need for your project.
Read article →Create self-service payment points with QR codes. Accept USDC payments automatically without staff involvement—perfect for add-on services, donations, and unattended sales.
Read article →Learn how to accept stablecoin payments like USDC and USDT for your business. Reduce fees, speed up settlements, and reach global customers without the complexity of traditional payment processors.
Read article →An honest comparison of crypto payment gateways from a merchant's perspective. Learn about custodial vs non-custodial risks, why stablecoins matter, and which gateway fits your business type.
Read article →A deep dive into ERC-3009 Transfer With Authorization - the cryptographic standard that enables gasless, signature-based token transfers in the x402 protocol.
Read article →Understanding how Solana's native architecture enables x402 payments without needing ERC-3009, and how Token-2022 extensions enhance the experience.
Read article →A merchant's guide to choosing between USDT and USDC. Compare transparency, liquidity, regulations, network fees, and regional preferences to make the right choice for your business.
Read article →A technical explanation of why USDT (Tether) isn't compatible with the x402 protocol, and why USDC is the stablecoin of choice for HTTP-native payments.
Read article →A comprehensive guide to x402 facilitators - what they do, why they matter, and a complete list of available facilitators with their supported networks.
Read article →A comprehensive comparison of USDC payment methods for developers, freelancers, and merchants. From wallet addresses to x402 protocol, find the best solution for your needs.
Read article →A hands-on guide to integrating the x402 payment protocol into your applications. Learn middleware setup, payment lifecycle, testing with x402-fetch, and production deployment.
Read article →Learn how the x402 protocol enables zero-fee, instant cryptocurrency payments through HTTP 402 status code, and how to integrate it into your applications.
Read article →The x402 protocol promises zero-fee, instant payments for AI agents. But three critical gaps are blocking real-world adoption. Here's what's missing—and how to fix it.
Read article →How Model Context Protocol (MCP) enables AI agents to make autonomous payments, and why this changes everything.
Read article →A deep dive into how stablecoin payments work, from token transfers to confirmation times, and what developers need to know.
Read article →Today we're launching PayIn, a non-custodial payment processor that lets businesses accept USDT, USDC, and other stablecoins across multiple blockchains.
Read article →For the current receiving product, start with wallet setup and the difference between a public receiving link and private management access. Original posts may describe earlier PayIn products; they are not a promise that every historical feature is offered today.
Read current documentation →
