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triangulated-fx-rates

Reference for multi-hop / triangulated currency conversion on batch rate tapes. When a rate row carries an explicit "via" currency, the row's rate is only one leg of the conversion, and the via currency may ITSELF be quoted through another via — so the effective rate is the product of every leg, resolved by walking the chain until a direct quote is reached. Useful when an FX feed lists some pairs directly to the reporting currency and others as triangulated (or doubly-triangulated) quotes through vehicle currencies.

tasks-extra/cobol-gl-batch-reconcile/environment/skills/triangulated-fx-rates/SKILL.md

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# Triangulated FX rates

Most rate feeds list a direct rate to the reporting currency (typically
USD). Less liquid currencies are often quoted *through* a more liquid
vehicle currency (commonly EUR or USD itself). On a batch rate tape this is
encoded as a second "via" column on the same row:

```
CCY  RATE     VIA
USD  1.0000
EUR  1.0850
GBP  1.2750
CHF  0.9200   EUR     <-- CHF -> EUR is the first hop
ZAR  0.0650   EUR     <-- ZAR -> EUR is the first hop