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OpenSigner

OpenSigner

Open-source non-custodial wallet solution

Website openfort.io
Overview

What it is

The wallet stack for agentic and stablecoin payments — one open-source SDK instead of five vendors. Used by 50+ projects. Maintainer of opensigner.dev

Intent

I need it when

Deploy embedded wallets for consumer or enterprise applications while retaining cryptographic sovereignty

OpenSigner powers Openfort's embedded wallet infrastructure with sub-200ms wallet creation and ERC-4337 smart account support. Developers can self-host OpenSigner to generate user wallets on EVM and SVM chains while keeping keys non-custodial and fully under user control.

Build non-custodial wallets with transparent, auditable key management that avoids vendor lock-in

OpenSigner is open-source key management fully auditable and self-hostable, enabling developers to generate non-custodial wallets using TEEs and MPC without relying on a single vendor. Users can fork, audit, or run it inside their own infrastructure, maintaining complete transparency and control over wallet creation.

Reduce security risk and compliance burden by eliminating third-party key custody

OpenSigner's open-source, self-hostable architecture eliminates vendor custody of user keys. Multiple security audits (Cure53, Quantstamp) validate the cryptographic implementation, and organizations can run signing infrastructure within their own secure environment, meeting compliance and risk management requirements.

Implement secure, policy-driven transaction signing for backend automation and AI agent wallets

OpenSigner provides TEE-based and MPC signing for backend wallets and agent wallets, enabling programmatic transaction authorization with policy rules. Developers can control which operations agents or backend systems can sign, how much they can spend, and which contracts they can call—all with auditable, self-hosted key management.

Drop

Not a fit when

  • User requires a fully managed, vendor-hosted key management solution without self-hosting responsibility
  • Organization lacks infrastructure expertise to deploy and maintain TEE-based or MPC signing systems
  • Project needs immediate turnkey custody solution without auditing or forking the underlying code
  • Use case requires proprietary, closed-source key management with vendor lock-in guarantees
  • Team cannot commit to security audit and maintenance of self-hosted cryptographic infrastructure
Commercials

Pricing

Open-source, self-hostable key management system. No direct pricing; included as part of Openfort's wallet infrastructure or deployable independently. View pricing