✨ price-feeds: add inverse feed

[patitonar]

Summary by CodeRabbit

• New Features
  • Added support for inverse price feeds, which calculate prices as the inverse of an existing feed. Inverse feeds round results up and reject zero or negative source prices.
  • Markets can now be configured to use inverse price feeds.
• Bug Fixes
  • Corrected price-feed deployment handling for inverse feed configurations.

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🦋 Changeset detected

Latest commit: 2e0b944

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@exactly/protocol	Patch

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-06T18:35:44.752090Z	2e0b944	PR opened

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Walkthrough

Adds PriceFeedInverse, which returns the rounded-up inverse of a source feed’s answer. Market configuration and deployment scripts now support selecting the inverse feed and deploying it with the corresponding Inverted feed address.

Changes

Inverse Price Feed

Layer / File(s)	Summary
Inverse calculation and validation contracts/PriceFeedInverse.sol, test/PriceFeedInverse.t.sol, .gas-snapshot	Adds PriceFeedInverse and tests for its metadata, inverse results, rounding, high-price scaling, auditor pricing, and reverts for zero or negative answers. Updates recorded gas measurements, including entries for the new tests.
Inverse feed configuration and deployment hardhat.config.ts, deploy/mocks/Assets.ts, deploy/PriceFeeds.ts, .changeset/swift-heron-flips.md	Allows "inverse" in MarketConfig.priceFeed. The mock deployment selects the Inverted feed name for inverse configuration. PriceFeeds deploys PriceFeedInverse with that feed address. Adds a patch-release Changeset for @exactly/protocol.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant PriceFeeds
  participant PriceFeedInverse
  participant tenderlify
  PriceFeeds->>PriceFeedInverse: Deploy with Inverted feed address
  PriceFeedInverse-->>PriceFeeds: Return deployed inverse feed
  PriceFeeds->>tenderlify: Pass deployed feed

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Suggested reviewers: cruzdanilo

Merge Risk: 🔵 Low · up to 2e0b9

The inverse price feed is additive and not yet selected by any market. The only remaining item is aligning its math library with the project convention, which does not affect current deployments.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding an inverse price feed.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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ℹ️ Review info

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• Configuration used: Organization UI
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• Run ID: f4e1b4b9-0532-4892-a7e2-f75c74041420

📥 Commits

Reviewing files that changed from the base of the PR and between 0d1ca2a and 2e0b944.

📒 Files selected for processing (7)

• .changeset/swift-heron-flips.md
• .gas-snapshot
• contracts/PriceFeedInverse.sol
• deploy/PriceFeeds.ts
• deploy/mocks/Assets.ts
• hardhat.config.ts
• test/PriceFeedInverse.t.sol

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Reviewed commit: 2e0b9442ff

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.80%. Comparing base (0d1ca2a) to head (2e0b944).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #821      +/-   ##
==========================================
+ Coverage   94.79%   94.80%   +0.01%     
==========================================
  Files          31       32       +1     
  Lines        2745     2751       +6     
  Branches      472      368     -104     
==========================================
+ Hits         2602     2608       +6     
  Misses        142      142              
  Partials        1        1              

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