Source: https://guthlabs.ai/docs/instruments/currency-converter-live/implementation/

instrument implementation / implementation-contract

# Currency Converter (Live) implementation

A source-bound implementation contract for Currency Converter (Live); deployment and executable qualification remain separate.

Status: **DISPOSED_UNVERIFIABLE_OFFLINE**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: source-required

**Evidence ID**: live-source boundary

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification has no defined handling for extreme finite inputs, so an amount of 1e308 with rate 100 can overflow to Infinity in ordinary floating-point arithmetic. It also leaves the treatment of negative amounts ambiguous. The live/offline cache branch is workable only if the cached timestamp and stale-data status are shown.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The interface must expose source, freshness, and held state instead of calculating from a nonexistent offline oracle.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/currency-converter-live/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/currency-converter-live/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/currency-converter-live/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`