mega.callContract()

Execute any contract write function through the wallet. Supports single calls or a batch array. With silent: true and a matching Smart Approvals grant, calls skip the approval UI and execute directly.

Signature

mega.callContract(request: CallContractRequest | CallContractRequest[]): Promise<TransactionResult>

Parameters

CallContractRequest:

Field	Type	Required	Notes
address	`0x${string}`	required	Contract address.
abi	any	optional	Contract ABI fragment. Required unless data is pre-encoded.
functionName	string	optional	Function to call. Required unless data is pre-encoded.
args	any[]	optional	Function arguments.
data	`0x${string}`	optional	Pre-encoded calldata (alternative to abi/functionName/args).
silent	boolean	optional	Skip approval UI. Requires a matching session grant on { to, signature }.
silentUIApproveFallback	boolean	optional	When silent: true but the matching permission has expired, fall back to UI approval instead of failing silently.
value	bigint / string	optional	Native value to send (wei).
sponsor	boolean	optional	Request sponsorship in explicit mode.
maxGasAllowance	bigint	optional	Override the default max gas allowance — use when sending large payloads that exceed defaults.

For batch calls, pass an array. The wallet shows one approval for the whole batch.

Examples

Single call:

const tx = await mega.callContract({
  address: '0xTokenAddress',
  abi: tokenAbi,
  functionName: 'approve',
  args: ['0xSpenderAddress', 1_000_000n],
});

Silent execution after a permission grant:

const tx = await mega.callContract({
  address: '0xTokenAddress',
  abi: tokenAbi,
  functionName: 'approve',
  args: ['0xSpenderAddress', 1_000_000n],
  silent: true,
});

Batch:

const tx = await mega.callContract([
  {
    address: '0xTokenAddress',
    abi: tokenAbi,
    functionName: 'approve',
    args: ['0xRouterAddress', 1_000_000n],
  },
  {
    address: '0xRouterAddress',
    abi: routerAbi,
    functionName: 'swapExactTokensForTokens',
    args: [1_000_000n, 990_000n, path, '0xUserAddress', deadline],
    value: 0n,
  },
]);

Response

Shared TransactionResult shape. For batch calls, result.receipts is populated instead of result.receipt.

Notes

• silent: true only works after a successful grantPermissions() covering the exact { to, signature } pair. If the grant is missing or expired, the call resolves with status: 'error'.
• For read calls (no transaction), use getFromContract().
• Types are intentionally broad — create typed wrappers in your app for contracts you call repeatedly.