x402 in 2026 -- Coinbase, Tempo, MoonPay, and the Only Multi-Chain Non-Custodial Option

The x402 standard is having its moment. Stripe-backed Tempo is heading to testnet. Coinbase shipped agentic wallet infrastructure in February. MoonPay launched their agent wallet this week. Everyone is announcing. Here's what's actually live, what's vaporware, and where the real technical gaps are. What x402 Is x402 is an HTTP payment protocol. An agent hits an endpoint, gets a 402 Payment Required response with a payment address and amount, signs a payment header locally, and retries the request. No payment processor intermediary. No custodial hold. The server verifies the on-chain payment and responds. Coinbase proposed the standard. It's simple and it works. The question is who has actually implemented it across real chains. The Field Coinbase Agentic Wallets Coinbase shipped x402 support in February 2026. Base mainnet, USDC. Their agentic wallet product wraps a TEE (Trusted Execution Environment) to handle key management -- semi-custodial. Coinbase operates the TEE infrastructure.