The vault runs on Sodot's MPC key infrastructure, the Israeli firm MoonPay bought for roughly $100 million in April, and settles through the x402 payment standard that Coinbase built and gave away to the Linux Foundation.
MoonPay released PayBox on Tuesday, a non-custodial payment vault that connects Claude and ChatGPT to Solana and seven Ethereum-compatible chains and lets an AI agent execute the transaction the user just asked about. The company frames the product as the first payment vault built for AI. It closes the loop between agent research and agent purchase.
Until now, ChatGPT and Claude could plan a purchase but not complete it. A user still had to switch to a browser, log into a payment service, and finish the trade themselves. PayBox slots in between the AI and the merchant: the user prompts the agent, the agent lines up the transaction, and the user approves with a passkey on their phone before funds move. Wallet keys are split via multi-party computation and stored in hardware-isolated trusted execution environments, so neither MoonPay nor the AI can sign a transaction alone.
PayBox launches with Solana and seven EVM chains: Ethereum, Hyperliquid, Tempo, Base, Robinhood Chain, Arbitrum and Polygon. Initial integrations cover restaurant reservations, flight bookings and shopping across major online retailers. Beyond consumer commerce, users can also swap tokens, bridge funds between chains, and route capital into DeFi protocols including Aave. Card payments travel over Visa's agentic commerce protocol, meaning the AI never sees the card number.
The plumbing is x402, an open standard for agent-initiated payments originally built by Coinbase and since transferred to the Linux Foundation. Its backers list — Visa, Mastercard, Stripe, Shopify, AWS, Cloudflare and Anthropic among more than twenty — is the more meaningful signal than any single endorsement, because it is the mechanism through which those firms have agreed AI agents are allowed to spend money on the open internet. MoonPay is one of the first consumer products to ship against it.
The security backbone comes from Sodot, an Israeli multi-party-computation firm MoonPay acquired for roughly $100 million in April in an all-stock deal. Sodot's key management technology already secures more than $50 billion in assets across ten million wallets, with eToro and BitGo among the customers. Buying the infrastructure rather than licensing it puts MoonPay in a strong position if the agent-payment market scales as its backers expect.
PayBox is the culmination of a build that began in March, when MoonPay published an open wallet standard for AI agents with support from PayPal, the Ethereum Foundation and the Solana Foundation. In May, the company shipped an app letting ChatGPT users buy crypto, though the actual settlement still required a browser checkout. A June desktop app connected Claude and Codex to wallets directly. MetaMask launched its own self-custodial agent wallet around the same time with a $10,000 per-transaction cap. PayBox removes the last handoff and takes a different security route than either predecessor.
The design choice worth flagging is the custody model. Every previous iteration of this problem has forced users to hand a hot wallet to the agent and hope. PayBox splits the key, holds one shard in hardware, and requires a device-side passkey for every settlement, all while running on a payment rail Visa and Mastercard both back. Whether AI agents move enough money to justify the architecture is a question for the next two quarters. The point today is that the architecture now exists, and it does not require anyone — MoonPay included — to hold the keys.
