Implement getTFTBillingRate#4430

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zaelgohary wants to merge 3 commits intodevelopmentfrom

development_add_getTFTBillingRate

Commits on Nov 17, 2025

Implement getTFTBillingRate in tfchain client & replace get tft price w getTFTBillingRate in grid client & playground
zaelgohary
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Revert swap price changes
zaelgohary
committed

Commits on Nov 19, 2025

Rename billing rate fns based on returned unit, throw err instead of masking failure
zaelgohary
committed