Skip to main content
Agent wallets give AI agents and autonomous systems self-custodial signing so they can participate in x402 payment flows without human-driven setup.

​
Overview table

ProviderCategoryDocs / Get StartedNotes
Wallet Development Kit (WDK)Agent wallet SDKhttps://docs.wallet.tether.ioTether’s open-source SDK; WalletAccountEvm satisfies the x402 client signer interface natively

​
Wallet Development Kit (WDK) by Tether

An open-source SDK from Tether for building self-custodial AI agent wallets. WDK enables agents to generate and store private keys locally, without relying on cloud-based KMS or TEE infrastructure. The WalletAccountEvm instance from WDK natively satisfies the client signer interface required by the x402 SDK. An agent equipped with WDK and USDT0 on Stable can automatically intercept 402 HTTP responses, sign ERC-3009 authorizations, and resubmit requests. Packages: @tetherto/wdk, @tetherto/wdk-wallet-evm Capabilities
  • Self-custodial key generation and local storage
  • Native x402 client signer compatibility via WalletAccountEvm
  • Automatic 402 response interception and ERC-3009 signing
  • Multi-chain support including Stable
Docs: https://docs.wallet.tether.io
Have an agent wallet integration with Stable? Reach out at bizdev@stable.xyz.
Last modified on April 16, 2026