Build with clear boundaries.

Start with the calculation toolkit, preserve the evidence, and connect external data only after defining its method and validation policy.

AVAILABLE · TVX SDK 0.1.0

A small calculation core. Explicit inputs.

Decimal-string conversion, snapshot validation, and documented error behavior. No runtime dependencies.

Source ZIP npm tarball

Reproduce the example

Open the lab or install the downloaded package. Keep the input values as decimal strings.

npm install ./openforex-tvx-0.1.0.tgz

import { calculate } from '@openforex/tvx';

const evidence = calculate({
  amount: '120.00',
  fromValue: '0.50',
  toValue: '6.00',
  decimals: 2,
  rounding: 'half-even'
});
// evidence.result === '10.00'

Try it in the browser

Make failure behavior part of the design
Test zero denominators, invalid decimals, missing observations, stale data, and rounding boundaries before integrating a feed.
Follow the integration walkthrough
Keep a reproducible evidence record
Record the source, method revision, timestamps, numeric policy, and result. Separate a computed amount from any service that executes transactions.
Use the evidence review guide

Choose the right interface

Calculation SDKFunctions, installation, precision, and snapshots.Public publication APIRead the resource catalog and download Markdown.Source and contribution workflowRepository access and the package layout.Release checksumsVerify the downloaded source and package archives.

A small calculation core. Explicit inputs.

Reproduce the example

Make failure behavior part of the design

Keep a reproducible evidence record

Choose the right interface