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+---
+simd: '0133'
+title: Syscall Get-Epoch-Stake
+authors:
+  - Joe Caulfield (Anza)
+category: Standard
+type: Core
+status: Draft
+created: 2024-03-25
+feature: (fill in with feature tracking issues once accepted)
+---
+
+## Summary
+
+A syscall to retrieve a vote account's delegated stake for the current epoch.
+
+## Motivation
+
+Currently, on-chain programs have no knowledge of the current epoch's stake and
+how much active stake is delegated to any vote account.
+
+If this data were available for querying by on-chain programs, it would unblock
+many use cases, such as validator governance and secondary consensus mechanisms,
+that were previously not possible on Solana.
+
+Additionally, this would enable the Feature Gate program defined in
+[SIMD 0089](./0089-programify-feature-gate.md) to tally vote account stake in
+support for a pending feature gate.
+
+## Alternatives Considered
+
+[SIMD 0056](https://github.com/solana-foundation/solana-improvement-documents/pull/56)
+proposes using an on-chain sysvar account to store all of the current epoch's
+stake.
+
+Because account data is finite, using a sysvar account to store even just the 
+current epoch's stake limits the number of entries that can be stored. The
+amount of validators in one Solana cluster could surpass this number in the
+future.
+
+Exposing epoch-stake information through a syscall avoids this account maximum
+size constraint. While the syscall approach does not offer the easy off-chain
+retrieval of a sysvar, there are existing ways to get epoch-stake data off
+chain. The priority of a new design should be making the data available to
+on-chain programs.
+
+## New Terminology
+
+N/A.
+
+## Detailed Design
+
+The specification for the proposed syscall is as follows:
+
+```c
+/**
+ * Retrieves the total active stake delegated to a vote account for the current
+ * epoch.
+ *
+ * @param vote_addr     A pointer to 32 bytes representing the vote address.
+ * @return              A 64-bit unsigned integer representing the total
+ *                      active stake delegated to the vote account at the
+ *                      provided address.
+ */
+uint64_t sol_get_epoch_stake(/* r1 */ void const * vote_addr);
+```
+
+### Control Flow
+
+The syscall aborts the virtual machine if not all bytes in VM memory range
+`[vote_addr, vote_addr + 32)` are readable.
+
+Otherwise, the syscall returns a `u64` integer representing the total active
+stake delegated to the vote account at the provided address.
+
+If the provided vote address corresponds to an account that is not a vote
+account or does not exist, the syscall will return `0` for active stake.
+
+### Compute Unit Usage
+
+The syscall will always attempt to consume the same amount of CUs regardless of
+control flow.
+
+```
+syscall_base + floor(32/cpi_bytes_per_unit) + mem_op_base
+```
+
+- `syscall_base`: Base cost of a sysvall.
+- `cpi_bytes_per_units`: Number of account data bytes per CU charged during CPI.
+- `mem_op_base`: Base cost of a memory operation syscall.
+
+## Impact
+
+Dapp developers will be able to query vote account stake for the current epoch
+from within on-chain programs.
+
+## Security Considerations
+
+This new syscall introduces the same security considerations as the rest of the
+syscalls in the existing interface, which manipulate raw pointers to VM memory
+and must be implemented with care.
+