Funding Protocols

Funding protocols determine how a card is provided with available balance and how the Immersve platform can settle or refund. A Funding Protocol is selected by specifying the Funding Type when creating a Funding Channel.

Protocol Variants

Four different variants classify immersve card funding protocols: deposit-based, approval-based, custodial, and mock.

Deposit Based Funding

Deposit-based funding requires cardholders to transfer assets into an Immersve smart contract. Deposits can be withdrawn at any time. Deposit-based funding is further classified into two sub-variants based on where tokens are deposited: universal and flexi.

Universal — The universal variant pools tokens into a single partner-scoped contract and is optimized for gas usage so it can operate on any blockchain. The Universal EVM Funding Protocol implements universal deposit-based funding.

Flexi — The flexi variant holds deposits in a smart contract per cardholder. The cardholder balance can be inspected on-chain, and permissionless withdrawals are supported. A cardholder contract will need to be deployed as part of cardholder onboarding. The Algorand Funding Protocol implements flexi deposit based funding.

Approval Based Funding

Approval-based protocols can spend tokens directly from a cardholder's existing wallet. The Universal EVM Funding Protocol supports approval-based funding on some EVM chains.

Custodial Funding

Custodial protocols enable the integrating partner to perform off-chain payment authorizations in real-time. Custodial funding leverages one of the on-chain deposit-based funding protocols for settlement. See Custodial Funding Protocol.

Mock Funding

Mock funding enables the creation of test cards without building any funding integration. This is useful for testing card-issuing user experiences when your funding solution is not fully implemented. See Simulator Funding Protocol.

Available Chains