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Before a wallet can send a gas-sponsored transaction, its EOA must be delegated — once — to the Dynamic delegation contract via an EIP-7702 authorization. That delegation is what lets a relayer submit a batch of calls on the user’s behalf.
You usually don’t need any of this. When sendSponsoredTransaction runs on a wallet that isn’t delegated yet, the SDK signs the EIP-7702 authorization automatically and attaches it to the first call. The functions below exist for when you want explicit control over the delegation step — for example, activating it during onboarding.

is7702DelegationActive

Checks whether delegation to the Dynamic gasless contract is active for a wallet on its current network. Results are cached per wallet + chain in an in-memory registry, so repeated calls are cheap.

Parameters

Returns

Promise<boolean>true if the wallet has an active delegation to the Dynamic gasless contract on its current network.

sign7702Authorization

Signs an EIP-7702 authorization delegating the wallet to the Dynamic delegation contract. The signed authorization can be attached to a sponsored transaction to activate delegation on-chain. If no chainId is provided, the wallet’s active network is used.

Parameters

Returns

Promise<SignAuthorizationReturnType> — viem’s signed EIP-7702 authorization. Pass it to signSponsoredTransaction, sendSponsoredTransaction, or activate7702Delegation.

activate7702Delegation

Persists the delegation on-chain up-front, before any user-facing transaction — useful during onboarding. It sends a sponsored transaction that carries only the EIP-7702 authorization (an empty batch of calls) and returns the transaction hash. Afterwards, sponsored transactions no longer need to include an authorization.

Parameters

Returns

Promise<{ transactionHash: Hex }> — the on-chain transaction hash of the activation. Throws a SponsorTransactionError if the relay fails or times out.
Last modified on July 23, 2026