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The feegrant module allows accounts (granters) to grant fee allowances to other accounts (grantees). This allows the grantee to use the granter’s funds to pay for transaction fees.

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Messages

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MsgGrantAllowance

A fee allowance grant is created using the MsgGrantAllowance message. If there is already a grant for the (granter, grantee) pair, then the new grant will overwrite the previous one. 
import { Network } from "@injectivelabs/networks";
import { MsgBroadcasterWithPk } from "@injectivelabs/sdk-ts/core/tx";
import { MsgGrantAllowance } from "@injectivelabs/sdk-ts/core/modules";

const privateKeyOfGranter = "0x...";

const date = new Date("2023-10-02T00:00:00Z");
const expiration = date.getTime() / 1000;
const granter = "inj...";
const grantee = "inj...";
const allowance = {
  spendLimit: [
    {
      denom: "inj",
      amount: "10000",
    },
  ],
  expiration,
};

const msg = MsgGrantAllowance.fromJSON({
  granter,
  grantee,
  allowance,
});

const txHash = await new MsgBroadcasterWithPk({
  privateKey: privateKeyOfGranter,
  network: Network.Testnet,
}).broadcast({
  msgs: msg,
});

console.log(txHash);

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MsgRevokeAllowance

A grant can be removed using the MsgRevokeAllowance message. The grantee will no longer be able to use the granter’s funds to pay for transaction fees. 
import { Network } from "@injectivelabs/networks";
import { MsgBroadcasterWithPk } from "@injectivelabs/sdk-ts/core/tx";
import { MsgRevokeAllowance } from "@injectivelabs/sdk-ts/core/modules";

const privateKey = "0x...";
const granteeAddress = "inj...";
const granterAddress = "inj...";

const params = {
  grantee: granteeAddress,
  granter: granterAddress,
};

const msg = MsgRevokeAllowance.fromJSON(params);

const txHash = await new MsgBroadcasterWithPk({
  privateKey,
  network: Network.Testnet,
}).broadcast({
  msgs: msg,
});

console.log(txHash);