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EIP-7702 mode is the default and recommended way to use Universal Accounts. It upgrades a user’s existing EOA in-place—no new address, no asset migration—by delegating execution to Particle’s Universal Account contract via a Type-4 transaction. However, not all wallets can produce the authorization signature required for this delegation. Type-4 transactions carry an authorizationList field that must be signed by the EOA’s private key. Standard JSON-RPC wallets (MetaMask, Rabby, etc.) do not expose this primitive, so they cannot be used in 7702 mode.
EIP-7702 mode requires an embedded (WaaS) wallet.JSON-RPC wallets do not support the signAuthorization call needed to create Type-4 transactions. If you need to support those wallets, use Smart Account mode instead.
The following embedded wallet providers have been verified to work with Particle’s EIP-7702 Universal Account implementation:
ProviderSigning APIAuth method
Dynamic (WaaS)waasConnector.signAuthorization()isDynamicWaasConnector() guard required
Magicmagic.wallet.sign7702Authorization()magic.wallet.send7702Transaction() handles Type-4 tx
PrivysignAuthorization() hookReturns r, s, yParity; serialize via ethers.Signature

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How Delegation Works (Any Provider)

Regardless of the embedded wallet you use, the delegation flow follows the same structure: 
1. Check delegation status
   → universalAccount.getEIP7702Deployments()

2. Get the authorization parameters for each chain that needs delegation
   → universalAccount.getEIP7702Auth([chainId])

3. Sign the authorization with the embedded wallet's 7702 API
   → provider.signAuthorization({ address, chainId, nonce })

4. Send a Type-4 transaction carrying the authorizationList
   → walletClient.sendTransaction({ authorizationList: [...] })

5. Sign the transaction rootHash (standard personal_sign)
   → provider.signMessage(rootHash)

6. Broadcast via the Universal Account SDK
   → universalAccount.sendTransaction(transaction, signature)
Steps 3 and 4 are provider-specific. Each demo below shows the exact implementation for its wallet.

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Demos

Magic

Next.js demo showing Magic email-OTP login, EIP-7702 delegation on Arbitrum, and a cross-chain ETH → USDC (Solana) conversion.Key packages: magic-sdk, @magic-ext/evm

Dynamic (WaaS)

Next.js demo showing Dynamic WaaS login, EIP-7702 delegation on Arbitrum, and a cross-chain ETH → USDC (Solana) conversion.Key packages: @dynamic-labs/sdk-react-core, @dynamic-labs/ethereum-aa

Privy

Next.js demo showing Privy social login, EIP-7702 delegation, unified balance view, and cross-chain swaps.Key packages: @privy-io/react-auth, @privy-io/wagmi

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Inline Delegation During Transactions

For chains where delegation hasn’t happened yet, the Universal Account SDK can request inline authorizations as part of a regular transaction. You don’t need a separate delegation step—iterate over the userOps in the transaction and sign any pending eip7702Auth entries before calling sendTransaction(): 
const transaction = await universalAccount.createConvertTransaction({ ... });

const authorizations: EIP7702Authorization[] = [];
const nonceMap = new Map<number, string>();

for (const userOp of transaction.userOps) {
  if (userOp.eip7702Auth && !userOp.eip7702Delegated) {
    let signature = nonceMap.get(userOp.eip7702Auth.nonce);
    if (!signature) {
      // Use your provider's signAuthorization here
      const rawAuth = await provider.signAuthorization(userOp.eip7702Auth);
      signature = Signature.from(rawAuth).serialized;
      nonceMap.set(userOp.eip7702Auth.nonce, signature);
    }
    authorizations.push({
      userOpHash: userOp.userOpHash,
      signature,
    });
  }
}

const rootHashSignature = await walletClient.signMessage({
  account: userAddress,
  message: { raw: transaction.rootHash },
});

const result = await universalAccount.sendTransaction(
  transaction,
  rootHashSignature,
  authorizations,
);
This pattern works with any of the providers above—swap in their respective signAuthorization call.