We Integrated x402 + MPP on Day One — Here's What 569 Real Agent Probes Tell Us About Dual-Protocol Commerce

On March 18, Stripe and Paradigm launched MPP — the Machine Payments Protocol. We had it live the same day. Two payment protocols, one marketplace, 569 real agent probes. Here's what the data actually shows about where agent commerce is heading. Why Both Protocols x402 and MPP solve the same problem from different angles. x402 is stateless. Agent sends a GET, gets a 402 back with a price, pays USDC on Base, gets data. No sessions, no accounts, no Stripe. The payment is the credential. Cryptographic verification on-chain. For agents with wallets — particularly DeFi agents, on-chain tooling, and wallet-native infrastructure — this is the path of least resistance. MPP runs through Stripe's session infrastructure. The agent authenticates a payment session, then uses it for multiple requests. Lower per-request friction. No on-chain wallet required from the agent operator. For mainstream agent platforms — Claude, Cursor, Copilot-adjacent tooling — this removes the "set up a wallet" barrier t