Swing swap router on Osmosis Network

The swap router contract used for two purposes.

• Receive bridged tokens from non-cosmos chains, then swap and forward to user on osmosis or other cosmos chain via IBC transfer.
• Swap tokens on osmosis and send to axelar deposit address to bridge to non-cosmos chains.

Instantiation

To instantiate the contract, you need to specify the following parameters:

• admin: the admin user who can register ibc channels and admin configuration.
• operator: the operator user who can execute swap and forward to recipient address on target chain.

Example instantiation message

{
  "admin": "osmo1admin",
  "operator": "osmo1operator"
}

Execution

1. UpdateConfig

Update configuration(admin and operator address) by current admin user.

UpdateConfig {
    admin: Option<String>,
    operator: Option<String>,
}

2. SetIbcChannel

Register new ibc channel or update existing channel by admin user.

SetIbcChannel {
    chain: String,
    channel: String,
}

3. SwapAndForward

Operator calls this message to swap and forward to recipient address on destination chain.

SwapAndForward {
    id: String,
    input_denom: String,
    routes: Vec<SwapAmountInRoute>,
    amount: Uint128,
    min_output: Uint128,
    dest_chain: Option<String>,
    recipient: String,
}

input_denom, routes, amount, min_output are arguments used to send Osmosis MsgSwapExactAmountIn message.

id: Unique id per transaction. Used to prevent double swap due to backend issues.

dest_chain: The destination chain name. If it's null, recipient will get tokens on osmosis chain. If it's not null, the ibc channel must be registered by SetIbcChannel msg.

recipient: user address on destination chain to get swapped token.

4. Deposit

User deposits funds to swap and bridge via Axelar. The contract on destination chain(non-cosmos chain) swaps bridged token and forward to recipient address.

To allow deposit, the axelar ibc channel must be registered.

Deposit {
    input_denom: String,
    routes: Vec<SwapAmountInRoute>,
    dest_token: String,
    dest_chain: String,
    axelar_deposit_addr: String,
    recipient: String,
}

input_denom, routes, min_output are arguments used to send Osmosis MsgSwapExactAmountIn message.

dest_token: The final token address user gets on destination chain. dest_chain: Name of the destination chain. recipient: user address on destination chain to get swapped token.

Examples

Swap and forward tokens on osmosis chain.

{
  "wasm": {
    "contract": "osmo1crosschainswapscontract",
    "msg": {
      "swap_and_forward": {
        "id": "1",
        "input_denom": "uosmo",
        "routes": [
          {
            "pool_id": "197",
            "token_out_denom": "ibc/52b..."
          }
        ],
        "amount": "10000000",
        "min_output": "10000",
        "recipient": "osmo1recipient"
      }
    }
  }
}

Swap and forward tokens on juno network.

Requirement: juno ibc channel must be registered by SetIbcChannel Msg.

{
  "wasm": {
    "contract": "osmo1crosschainswapscontract",
    "msg": {
      "swap_and_forward": {
        "id": "1",
        "input_denom": "uosmo",
        "routes": [
          {
            "pool_id": "197",
            "token_out_denom": "ibc/52b..."
          }
        ],
        "dest_chain": "juno",
        "amount": "10000000",
        "min_output": "10000",
        "recipient": "juno1recipient"
      }
    }
  }
}

Deposit tokens to cross chain swap on non-cosmos chain.

Requirement: axelar ibc channel must be registered by SetIbcChannel Msg.

{
  "wasm": {
    "contract": "osmo1crosschainswapscontract",
    "msg": {
      "deposit": {
        "input_denom": "uosmo",
        "routes": [
          {
            "pool_id": "197",
            "token_out_denom": "ibc/52b..."
          }
        ],
        "dest_token": "0x1234...",
        "dest_chain": "ethereum",
        "axelar_deposit_addr": "axelar1depositaddr",
        "recipient": "0x3234..."
      }
    }
  }
}

Flow

Swap and forward

sequenceDiagram
    autonumber
    actor Alice
    actor Alice
    Alice->>EvmRouter: Deposit token on EVM router
    EvmRouter->>Osmosis: Bridge funds via Axelar.
    critical Execute Contract
            Osmosis->>Osmosis: Swap tokens
    end
    Osmosis->>Alice: Bank transfer or Ibc transfer

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Deposit

sequenceDiagram
    autonumber
    actor Alice
    actor Alice
    Alice->>Osmosis: Deposit on osmosis router
    critical Execute Contract
            Osmosis->>Osmosis: Swap tokens
    end
    Osmosis->>Axelar: Ibc transfer to axelar deposit addr.
    Axelar->>EvmRouter: Move funds to evm router.
    EvmRouter->>Alice: Swap and send funds.

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