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Simulation-based smart wallet verification, authored by Dexter, is now part of the canonical x402 repository. Multisigs and passkey wallets can pay over x402 on Solana.
MAY 2026 - Smart-wallet verification authored by Dexter has been merged into the canonical x402 protocol repository. Pull request #1527, merged May 28, 2026, adds simulation-based smart wallet verification to the protocol's Solana implementation.
x402 verification on Solana originally assumed one thing about the payer: a raw keypair signature. That assumption locks out every smart wallet, including multisigs, passkey-secured wallets, and program-owned accounts, which authorize transactions through on-chain logic instead of a single private key.
Simulation-based verification removes the assumption. Instead of checking a signature shape, the facilitator simulates the payment transaction and verifies the outcome. If the smart wallet's own logic approves the transfer, the payment verifies, whatever the wallet's internal structure looks like.
Dexter shipped smart-wallet support in its own facilitator in March. This merge moves that capability upstream into the protocol every x402 implementation builds from, as a contribution to the canonical repository rather than a Dexter-only extension.
It also laid the groundwork for what came next: a wallet where the signer is a passkey rather than a keypair needs exactly this kind of verification to pay over x402. That wallet is the Dexter Wallet, revealed in July.