Early Access

Delightful self‑custody.

Salt is a complete, machine-native platform for holding, controlling and moving digital assets. You and your cosigners hold every key share; Salt holds no key material.

Overview dashboard: account, policy, collaborator and fee totals above an accounts summary
Get early access to the Salt web app.

Design principles

  • SDK first Available nowEverything Salt does is available in the TypeScript SDK today, from organisations and accounts to policies and transactions. Start with npm install salt-sdk viem.
  • Your wallet is your identityNo usernames or passwords. You sign in with Ethereum (SIWE), and your address carries your role in each organisation.
  • Risk management on every transactionEvery transaction is checked against the account's policies before cosigners add their signature.
  • You choose where your cosigners runSalt will never hold your key material. We make it easy to host your own automated cosigners (Robo Guardians): self-deploy onto an Ubuntu or Debian server, or 1-click deploy on AWS. You also decide when they're online.
  • Recoverable if Salt goes darkYour assets don't depend on Salt being online. If Salt disappears, your signers can still move your assets.
  • Built on open standardsSIWE for sign-in, EIP-712 typed signatures, and x402 for small USDC fees with no gas for the payer.

Automated signing

Focus on what matters while your workflows run around the clock using Salt's policy-protected signing ceremonies.

The signing ceremony in a 2-of-3 account A human operator, a scheduled script or an AI agent proposes a transaction and signs with its key share. A second proposer holds the third share, which isn't needed for this signature. The account's policies are checked, a self-hosted Robo Guardian cosigns automatically with its own key share, and once two of the three shares have signed, one standard signature is broadcast onchain. Any proposer signs with its key share Human operatorScheduled scriptAI agent Policy check Robo Guardian cosigns with its key share Self-hosted Another proposer holds the 3rd share, not needed this time Threshold met One standard signature, broadcast Signing ceremony 2 of 3 key shares
Shown: a 2-of-3 account. Robo Guardians cosign only if the transaction passes policy. A person is only asked to approve when you've set a human-in-the-loop policy.

What makes Salt different

Machine native

An open, machine-native MPC platform. No gates such as API keys or sign-up forms: any entity with an EVM wallet can sign in and pay its own fees over x402.

Salt never holds a key share

Salt coordinates the ceremonies and checks policies, but it holds no part of your keys.

Built using blockchains

Salt stays portable and open by storing your encrypted key shares in a smart contract. This allows you to create and operate EVM, Bitcoin and Solana threshold accounts from any device.

Everything in one system

  1. OrganisationOwners, members and delegates, each identified by their wallet
  2. AccountsThreshold MPC accounts for EVM, with Bitcoin & Solana in Q1 2027
  3. CosignersYour devices and Robo Guardians
  4. PoliciesRules every transaction must pass, signed by you
  5. TransactionsAny proposer signs; cosigners sign once it passes policy
  6. RecoveryEncrypted key share backups on Arbitrum

Who is Salt for?

  • Organisations and treasury teamsCompany funds can be held under shared control, with the organisation's own policies and automated cosigners, without a third-party custodian.
  • Pro tradersThe SDK supports programmatic trading, redemption management and separately managed accounts (SMAs), all governed by a policy layer that supports granular DeFi policies.
  • Developers and fintechsMPC accounts and child accounts can be embedded into a product for its users. Tenant data separation keeps each fintech's users apart, and you can build your own front end on top.
  • AI agents and automated systemsAn agent can join an organisation as a delegate and propose transactions alongside people. Each proposal is checked against the account's policies.

Pricing

$10per MPC account
$0.10per transaction
  • Flat fees, whether you send $1 or $1bn
  • No AUM or custody fees, and no minimum spend
  • All supported chains included, paid in USDC over x402

Security

  • Salt's MPC is built on cryptography from Silence Laboratories, which has been independently audited by Trail of Bits, Cure53, HashCloak and Secfault Security.
  • Each signer holds one key share. Once the threshold is met, the shares produce a single standard signature. Onchain, it's a regular account (EOA), not a multisig.
  • You can recover an account yourself, without Salt, using an open-source recovery app.
  • Salt asks your wallet only for signatures, never for the key itself. Signing happens locally on your machine.
  • Hardware wallets work as signers, so your key can stay on a Ledger.
  • Each of your key shares is backed up to a smart contract on Arbitrum, encrypted to your wallet.
  • Every policy change is signed by an owner's wallet.
Website
salt.space
Docs
docs.salt.space
SDK reference
developer.salt.space/sdk
npm
npmjs.com/package/salt-sdk
Web app
app.salt.space (coming soon)
Terms
salt.space/terms/app

Example app

salt-fi

Independent

A vibe coded, open-source example of building on the Salt SDK: a guided terminal app that sets up an organisation, cosigners, an account and a first policy. It's maintained independently, isn't an official Salt product and hasn't been audited, so use it on testnet.

GitHub
github.com/salt-space/salt-fi
Field guide
salt-space.github.io/salt-fi/field-guide, a walkthrough for setting up salt-fi