ART-374 · Funds/NAV Family

Test NAV-Error Materiality

Compares an erroneous NAV-per-share against a corrected NAV-per-share against a declared materiality policy, using fixed-point money math throughout (no float accumulation). The policy defaults to industry half-cent absolute and 1% relative conventions, and a fund may supply its own thresholds to override either. Returns a material/immaterial verdict, affected-period math, an estimated impact figure, and a reprocessing-need indication. The fund-ops incident artifact, riding recompute_fund_nav's conventions.

Fixed-Point Money Math Supplied NAV Values, Never Fetched Not an Accounting Opinion
🔒 All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
What this does NOT prove
The erroneous and corrected NAV-per-share values here are supplied by you and merely asserted: this tool performs zero independent NAV recomputation (that is recompute_fund_nav's job) and zero market-data lookups (zero-egress, no network calls of any kind). It attests the arithmetic of the error comparison against a declared materiality policy. This is never an accounting opinion, never a determination that a fund must reprocess, and never advice. It computes what the declared policy implies, nothing more.
Fund & NAV Values
Declared Materiality Policy (leave blank for the industry defaults: half-cent absolute, 1% relative)
Affected Period (optional)
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Materiality Verdict
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Error (Abs, $/Share)
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Error (Abs, %)
Error detail
Industry convention vs. declared policy
TestAbsolute ThresholdPercent ThresholdBreach
Affected period & reprocessing indication
What was NOT proven
Compliance Flags
Provenance
Fixed-point (BigInt) money math throughout, mirroring recompute_fund_nav (ART-373): every value is parsed from its decimal string representation, never via floating multiplication, so there is no float-accumulation error anywhere in the arithmetic path.
⚠ DECISION-SUPPORT DRAFT. Not an accounting opinion, not a determination that a fund must reprocess, not advice. NAV values are supplied and asserted only.
OpenChainGraph v0.4 artifact · execution_hash:
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Ask your agent

    
  

  
Copy this paragraph into Claude, OpenClaw, or any MCP-aware agent to run this exact tool, with this sample, and verify the artifact.

  
Run the AINumbers MCP tool `test_nav_error_materiality`. Task: Compare an erroneous NAV-per-share against a corrected NAV-per-share against a DECLARED materiality policy (the industry half-cent absolute and 1% relative conventions, plus the fund's own policy taken as an input) using fixed-point BigInt money math throughout.
Call it with arguments: {"policy_parameters":{"fund_id":"FUND-A","valuation_date":"2026-07-18","erroneous_nav_per_share":10.001,"corrected_nav_per_share":10}}
Verify before trusting: call `verify_execution_hash` on mcp.ainumbers.co (https://mcp.ainumbers.co/mcp) with the parameter `claimed_hash` set to the returned `execution_hash`, passing the full artifact the run returned (the object containing `policy_parameters` + `output_payload` + `execution_hash`; equivalently `policy_parameters` + `output_payload` with `claimed_hash`), not the bare hash string.
Return the ledger link https://ledger.ainumbers.co/ so a human can re-verify without contacting us.
PII rule: All inputs are processed locally in your browser. No data is transmitted. Do not enter real personal data — use synthetic or anonymised inputs only.
Open the tool with the sample prefilled: https://ainumbers.co/chaingraph/art-374-test-nav-error-materiality.html#p=v1.H4sIAAAAAAAA_wFwAI__eyJmdW5kX2lkIjoiRlVORC1BIiwidmFsdWF0aW9uX2RhdGUiOiIyMDI2LTA3LTE4IiwiZXJyb25lb3VzX25hdl9wZXJfc2hhcmUiOjEwLjAwMSwiY29ycmVjdGVkX25hdl9wZXJfc2hhcmUiOjEwfXf0aApwAAAA