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+---
+sip: 343
+network: Ethereum & Optimism
+title: Add extra fields to existing Market Events to track market debt changes
+author: Noisekit (@noisekit)
+status: Draft
+created: 2023-10-03
+type: Governance
+---
+
+## Simple Summary
+
+In order to facilitate market's debt tracking over time, this proposal targets to extend existing market events in the Synthetix core system. 
+
+## Motivation
+
+The primary motivation behind this proposal is to provide a more comprehensive tracking system for changes in the market's debt. The added fields will enable analytics capabilities and in subgrapts to power UI, benefiting both developers and users.
+
+## Specification
+
+### Overview
+
+Under this proposal, `creditCapacity`, `netIssuance`, `depositedCollateralValue` and `reportedDebt` fields would be added to `MarketUsdDeposited`, `MarketUsdWithdrawn`, `MarketCollateralDeposited` and `MarketCollateralWithdrawn` events, which will store the market's debt-relaeted data at the time of each event.
+
+This will prevent the need to recalculate these values in the subgraph processor, thereby averting potential data discrepancies.
+
+### Technical Specification
+
+The proposal suggests additions to existing events by introducing new fields. The enhanced event signatures would appear as follows:
+
+```diff
+    event MarketCollateralDeposited(
+        uint128 indexed marketId
+        address indexed collateralType
+        uint256 tokenAmount
+        address indexed sender
++       int128 creditCapacity
++       int128 netIssuance
++       uint256 depositedCollateralValue
++       uint256 reportedDebt
+    );
+```
+
+
+```diff
+    event MarketCollateralWithdrawn(
+        uint128 indexed marketId
+        address indexed collateralType
+        uint256 tokenAmount
+        address indexed sender
++       int128 creditCapacity
++       int128 netIssuance
++       uint256 depositedCollateralValue
++       uint256 reportedDebt
+    );
+```
+
+```diff
+    event MarketUsdDeposited(
+        uint128 indexed marketId
+        address indexed target
+        uint256 amount
+        address indexed market
++       int128 creditCapacity
++       int128 netIssuance
++       uint256 depositedCollateralValue
++       uint256 reportedDebt
+    );
+```
+
+
+```diff
+    event MarketUsdWithdrawn(
+        uint128 indexed marketId
+        address indexed target
+        uint256 amount
+        address indexed market
++       int128 creditCapacity
++       int128 netIssuance
++       uint256 depositedCollateralValue
++       uint256 reportedDebt
+    );
+```
+
+## Test Case
+
+While this SIP doesn't necessitate additional test cases as it is non-breaking and just expands existing events with new fields, it's important that existing test cases receive updates to incorporate these extra properties.
+
+Moreover, it's crucial to note that the UI and subgraphs consuming these events must be modified to accommodate these changes.
+
+## Configurable Values (Via SCCP)
+
+N/A
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).