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Documentation Index

Fetch the complete documentation index at: https://docs.nxos.io/llms.txt

Use this file to discover all available pages before exploring further.

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Assets

An asset is a currency or token that can be held, traded, and paid out. Each asset has a code (uppercase identifier) and a scale (number of decimal places).
CodeTypeScaleExample amount
USDFiat2"10.50"
EURFiat2"100.00"
USDCStablecoin6"10.500000"
USDTStablecoin6"99.970000"
Asset codes appear throughout the API — in quote requests (fromAsset, toAsset), payout bodies (asset), and balance responses.

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Amounts

All monetary amounts are strings in major units — the human-readable form of the currency. Ten US dollars is "10.50", not 1000 or 10.5. 
{
  "amount": "10.50",
  "asset": "USD"
}
Amounts are always returned at the asset’s native precision. A USD amount always has 2 decimal places; a USDC amount always has 6. This makes responses predictable — you never need to guess how many decimals to expect.

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Why strings?

JSON has no decimal type. A JSON number like 10.50 may lose its trailing zero when parsed, and large values can exceed the precision of IEEE 754 floating-point numbers. Strings preserve the exact representation.
Parse amounts as arbitrary-precision decimals (e.g., BigDecimal in Java, Decimal in Python, big.js in JavaScript). Floating-point arithmetic introduces rounding errors that accumulate in financial calculations.

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Precision rules

When sending amounts to the API (e.g., in quote requests or payout bodies), provide them in major units as strings. The API validates that:
  1. The value is a valid decimal string
  2. The number of decimal places does not exceed the asset’s scale
Amounts with too many decimal places are rejected with a validation_error.