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Trade commodities, forex & indices onchain

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Make the most of Ostium. Enable gasless
transactions and 1-click trading

Withdraw funds from your smart account to an external wallet.

The Builder SDK overview covers requirements, the delegate model, gasless trading via Pimlico, and full code examples. We recommend reading it before you integrate.

Builder SDK documentation

You need a connected wallet or social login to run Builder SDK setup.

Connect a wallet to continue

With 1CT enabled, programmatic trading via the Builder SDK may stop working until you register a fresh delegate. Use “Remove delegate” below to clear on-chain delegation, then run the setup wizard again.

One-Click Trading may have replaced your SDK delegate

Registering an SDK delegate will overwrite your in-app 1CT delegate. You can re-enable 1CT from the user menu later, but that will override the SDK delegate.

One-Click Trading is enabled

The on-chain delegate no longer matches the one you registered on {{date}}. This happens when 1CT is re-enabled after exporting SDK credentials. Rotate your key to restore SDK access.

Your SDK delegate was overridden

Create a delegate private key in your browser, approve USDC once, and register the derived Safe as your on-chain delegate. After that you can use the Builder SDK in Delegated + Gasless mode: trades are signed by the delegate and submitted as sponsored ERC-4337 UserOperations via a Pimlico-compatible bundler (Ostium provides a default sponsor URL).

Builder SDK setup

This is the address that holds your USDC and positions.

Trader address

Ostium generates a fresh private key in your browser. You MUST save it — it cannot be recovered.

Generate delegate key

Ostium does NOT store this key. If you lose it you will have to generate and register a new one. Anyone with this key can place trades on your trader address.

Save this key securely

One-time approval so TradingStorage can move your USDC for trades placed via the SDK.

Approve USDC

Register the derived smart-account address as your on-chain delegate so the SDK can trade on your behalf.

Register delegate

Your delegate is registered on-chain. Paste your saved private key into the snippet below to construct an OstiumClient. Gasless mode uses Pimlico-compatible infrastructure; the SDK defaults to Ostium’s hosted sponsor endpoint when you omit pimlicoUrl.

UserOperations are sent through a bundler / paymaster URL (pimlicoUrl). For most integrations you can rely on the default Ostium sponsor URL shown in the snippet comments. Set sponsorshipPolicyId only if your Pimlico project uses a custom policy.