EIP-7821 and EIP-7702

Blockdaemon supports multi-call and batch transaction patterns as calldata, and the presentation specifically highlights EIP-7821 batch interface-based flows together with EIP-7702 type-4 gas-sponsored transactions.

These patterns are useful when you want to:

• submit multiple contract actions together
• reduce operational overhead
• support gas sponsorship models
• preserve governance and policy controls while improving execution UX

How it works

EIP-7821 batching

Batching allows multiple operations to be grouped into one execution flow. This is useful for:

• allowlist updates
• batched distributions
• coordinated administrative actions
• multi-step token workflows

EIP-7702 gas sponsorship

EIP-7702 introduces a way to support gas-sponsored transactions without requiring a full smart account stack with entry points, paymasters, or account factories.

The presentation describes the model as:

• no smart accounts required
• EOA code execution delegated to an existing contract
• a sponsoring EOA signs, broadcasts, and pays gas
• lower gas usage compared with ERC-4337

Example conceptual batch payload

{
  "chain": "base",
  "fromVaultId": "vault_ops",
  "batchStandard": "EIP-7821",
  "calls": [
    {
      "to": "0xaaaabbbbccccddddeeeeffff0000111122223333",
      "function": "setAllowlistStatus",
      "args": {
        "investor": "0x1111111111111111111111111111111111111111",
        "allowed": true
      }
    },
    {
      "to": "0xaaaabbbbccccddddeeeeffff0000111122223333",
      "function": "setAllowlistStatus",
      "args": {
        "investor": "0x2222222222222222222222222222222222222222",
        "allowed": true
      }
    }
  ]
}

Example conceptual gas sponsorship flow

const sponsoredTx = {
  type: "0x04",
  authorization: signedDelegation,
  sponsoredBy: sponsorAddress,
  callData: encodedOperation
};

Gas and execution considerations

The platform also supports:

• pre-sign simulation to check for reverts and balance sufficiency
• gas estimation by default
• gas parameter overrides
• raw transaction submission when full control is needed
• routing through your own nodes or preferred node provider

Why it matters

Batching and gas sponsorship improve usability and reduce friction in institutional workflows. They can help teams:

• compress repetitive admin operations
• reduce the number of separate approvals or submissions
• improve end-user experience for governed flows
• support gasless or sponsor-paid interactions where appropriate

When to use it

Use these patterns when you need to:

• batch multiple contract operations into one governed action
• execute large allowlist or distribution updates efficiently
• support sponsor-paid transactions
• simplify operational flows without changing your governance model

Notes

Network support and implementation details will vary. In practice, these patterns are usually paired with policy controls, simulation, and gas override capabilities.