Documentation Index
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Approve a token delegation.
Future<DelegationApproveResponse> approve({
required String chain,
required String token,
required String delegateAddress,
required String amount,
})
| Parameter | Type | Required | Description |
|---|---|---|---|
chain | String | Yes | CAIP-2 chain ID (e.g., "eip155:11155111" for Sepolia, "solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1" for Solana) |
token | String | Yes | Token symbol or address (e.g., "USDC") |
delegateAddress | String | Yes | The address to delegate to |
amount | String | Yes | The amount to delegate (e.g., "100.0") |
DelegationApproveResponse - An object containing:
| Property | Type | Description |
|---|---|---|
transactions | List<DelegationConstructedTransaction?>? | Array of constructed transactions (for EVM chains) |
encodedTransactions | List<String?>? | Array of encoded transaction strings (for Solana) |
metadata | DelegationApproveMetadata? | Approval metadata with chain ID, delegate amount, delegate address, token symbol, etc. |
import 'package:portal_flutter/portal_flutter.dart';
final portal = Portal();
final response = await portal.delegations.approve(
chain: 'eip155:11155111',
token: 'USDC',
delegateAddress: '0x1234...',
amount: '100.0',
);
// Sign and send the transaction
final tx = response.transactions!.first!;
final txResponse = await portal.request(
chainId: 'eip155:11155111',
method: 'eth_sendTransaction',
params: [
{'from': tx.from, 'to': tx.to, 'data': tx.data, 'value': tx.value}
],
);
print('Tx hash: ${txResponse.result}');
final response = await portal.delegations.approve(
chain: 'solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1',
token: 'USDC',
delegateAddress: '7smgSuU5mjP7QY5yWGdaTfgKn8hUWwvQgfvgcZB3HmJi',
amount: '100.0',
);
// Sign and send the transaction
final encodedTx = response.encodedTransactions!.first!;
final txResponse = await portal.request(
chainId: 'solana:EtWTRABZaYq6iMfeYKouRu166VU2xqa1',
method: 'sol_signAndSendTransaction',
params: [encodedTx],
);
print('Tx hash: ${txResponse.result}');
| Code | Description |
|---|---|
NOT_INITIALIZED | Portal was not initialized |
DELEGATION_FAILED | The delegation approval failed |
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