# Async Deposit and Redeem
Though [deposit and redeem handlers are totally arbitrary](/onyx-protocol/architecture/deposit-and-redeem.md), most will follow an asynchronous approach with 3 steps:
1. Create request
2. Execute batched requests
3. Distribute shares (deposit) or assets (redeem); can be synchronous with (2)
## Deposit
### Request
{% @mermaid/diagram content="sequenceDiagram
actor U as Investor
participant DQ as DepositHandler
participant Asset as ERC20
```
U->>DQ: request deposit:
- $assetAmount
DQ-->>DQ: validate request
DQ->>DQ: record request
DQ->>Asset: transferFrom()
Asset->>DQ: transfer $assetAmount" %}
```
### Fulfillment
{% @mermaid/diagram content="sequenceDiagram
actor Admin as Admin
participant DQ as DepositHandler
participant VH as ValuationHandler
participant FH as FeeHandler
participant Asset as DepositAsset
participant S as Shares
actor User as Investor
```
Admin->>DQ: execute requests:
- $requests
DQ->>VH: get:
- share price
- asset rate
VH-->>DQ: share price, asset rate
DQ-->>DQ: calculate shares due for $requests
DQ-->>DQ: calculate total assets for $requests
DQ->>FH: settle entrance fee
DQ->>Asset: transfer()
Asset->>S: transfer total assets
DQ->>S: mint
Note over S, User: possibly separate claim step
S->>User: transfer shares" %}
```
---
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