WisdomTreeVaultHistoricalReader

Documentation for eth_defi.tokenised_fund.wisdomtree.historical.WisdomTreeVaultHistoricalReader Python class.

class WisdomTreeVaultHistoricalReader

Bases: eth_defi.vault.base.VaultHistoricalReader

Read on-chain token supply and official off-chain NAV history.

Create a read-only historical reader.

Parameters

• vault – WisdomTree tokenised-fund adapter.

• stateful – Whether to persist adaptive scan state.

Attributes summary

address
first_block
share_price_change_threshold	Return this reader's sparse share-price comparison threshold.
uses_contextual_history	Return whether this reader supplies protocol-sourced observations.
uses_share_price_equivalence	Return whether cash flows must be ignored by the sparse filter.
write_all_samples	Retain every successful static Multicall sample, including unchanged NAVs.

Methods summary

__init__(vault, stateful)	Create a read-only historical reader.
construct_multicalls()	Construct the ERC-20 supply read.
fetch_contextual_historical_reads(...)	Yield protocol-sourced historical rows outside the static call grid.
process_result(block_number, timestamp, ...)	Create a historical row, failing only this row if NAV is unavailable.

__init__(vault, stateful)

Create a read-only historical reader.

Parameters

• vault (WisdomTreeVault) – WisdomTree tokenised-fund adapter.

• stateful (bool) – Whether to persist adaptive scan state.

construct_multicalls()

Construct the ERC-20 supply read.

Returns

One totalSupply multicall.

Return type

collections.abc.Iterable[eth_defi.event_reader.multicall_batcher.EncodedCall]

process_result(block_number, timestamp, call_results)

Create a historical row, failing only this row if NAV is unavailable.

Parameters

• block_number (int) – Archive block number.

• timestamp (datetime.datetime) – Naive UTC block timestamp.

• call_results (list[eth_defi.event_reader.multicall_batcher.EncodedCallResult]) – Supply read results.

Returns

Supply, official NAV and calculated total assets where available.

Return type

eth_defi.vault.base.VaultHistoricalRead

fetch_contextual_historical_reads(start_block, end_block, step)

Yield protocol-sourced historical rows outside the static call grid.

Contextual readers override this method and read an already-prefilled local cache. Network collection belongs before the common price scan.

Parameters

• start_block (int) – Inclusive archive block boundary.

• end_block (int) – Exclusive archive block boundary.

• step (int) – Approximate block spacing used to downsample source observations.

Returns

Ordinary VaultHistoricalRead rows for the common writer.

Raises

NotImplementedError – If a reader opts into contextual history without implementing it.

Return type

Iterable[eth_defi.vault.base.VaultHistoricalRead]

property share_price_change_threshold: float

Return this reader’s sparse share-price comparison threshold.

Event-only readers may require every exact price change; ordinary readers retain the existing ten-basis-point suppression threshold.

Returns

Non-negative relative suppression threshold.

property uses_contextual_history: bool

Return whether this reader supplies protocol-sourced observations.

Most EVM vaults expose static calldata that the common multicaller can execute on a regular block grid. Protocols such as GMX instead expose sparse value events that are prefetched into a protocol-owned cache.

Returns

False for the ordinary static-multicall path.

property uses_share_price_equivalence: bool

Return whether cash flows must be ignored by the sparse filter.

Vault-like products without a standard share-price method can still expose a supply-normalised price equivalent. Their TVL and supply changes must not create false performance observations.

Returns

True when the vault carries the share_price_equivalence feature.