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Before wiring calldata into your product, align on how Amplify Earn models strategies, assets, and execution responsibilities. These concepts shape the SDK helpers referenced throughout the docs.

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Vaults & Yield Types

  • Vault – On-chain contract that issues ERC-20 shares representing a position in an underlying strategy.
  • Yield Type – Logical grouping of vaults with similar mandates, exposed as the YieldType enum (CORE, PRIME, etc.).
  • Want Asset – Token users receive when withdrawing from a vault; often different from the deposit token.
Use fetchVaults to discover active vault configurations, eligible assets, and chain IDs.

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Shares vs. Assets

  • Deposits mint shares to the recipient. Shares track ownership of the vault.
  • Withdrawals burn shares and return the want asset using prepareWithdrawTxData.
  • Helpers return base-unit values; you provide the human-readable amounts as decimal strings.

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Allowances vs. Permits

  • Unified API (Recommended): Use prepareDepositAuthorization() to automatically detect the optimal method. It returns the appropriate flow based on token support and existing allowances.
  • Approval flow: Traditional ERC20 approval using prepareApproveDepositTokenTxData() followed by prepareDepositTxData().
  • Permit flow: When the token supports EIP-2612, sign typed data off-chain and use prepareDepositWithPermitTxData() for gas-efficient single-transaction deposits.
The unified API handles method detection automatically—use it for the best developer experience.

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Slippage Controls

  • Slippage is expressed in basis points (bps). For example, 100 means 1%.
  • Deposit helpers default to DEFAULT_DEPOSIT_SLIPPAGE, while withdraw helpers accept custom tolerance.
  • Helpers return minimum acceptable amounts in base units; you can override or disable slippage (not recommended for production).

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Execution Responsibilities

  • The SDK prepares calldata only; your app decides which signing stack executes it.
  • Use viem, wagmi, Privy, or custody flows to send the transaction.
  • Handle errors by catching APIError, which includes an endpoint property (e.g., prepareDepositWithPermitTxData).

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Withdrawals

  • prepareWithdrawTxData burns shares and redeems the want asset in a single transaction when on-chain liquidity is sufficient.
  • Surface slippage tolerance and eligibility checks so users know when immediate redemption is available.
Keep these concepts in mind while following the Quickstart or diving into the Functions reference.