Terra Classic uses the Cosmos SDK x/feegrantCopy x/feegrant module without custom logic. Grants, allowances, and CLI flows behave exactly as upstream.
Burn tax is charged in the ante handler (custom/auth/ante/fee_tax.goCopy custom/auth/ante/fee_tax.go) before fee allowances are applied. Grantees must ensure the granter account holds enough funds to cover both the burn tax and gas fees. Fee grants are often combined with tax-exemption lists for infrastructure wallets. Review x/taxexemptionCopy x/taxexemption when configuring service accounts.
Develop
Feegrant module (x/feegrant)
Allow trusted accounts to pay fees on behalf of other users.
Allow trusted accounts to pay fees on behalf of other users.