Connect SDK

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Formatters ​

Display helpers from @swapped/connect-sdk/format. Use them so fiat and token amounts match the same rules as the hosted widget and the SDK’s own formatted.* fields.

Works the same in Core and React — import from the format entry, not from @swapped/connect-sdk or /react.

ts
import { TokenSymbol } from '@swapped/connect-sdk'
import {
  formatCurrencyAmount,
  formatTokenAmount,
} from '@swapped/connect-sdk/format'

React hooks often already expose formatted strings (formattedMinAmount, balance.formatted.valueFiat, …). Reach for these helpers when you render your own amounts.

Currency ​

Token ​

Numbers ​

pretty vs js-number ​

ts
formatCurrencyAmount(1234.5)
// "1,234.50"       — pretty (UI labels)

formatCurrencyAmount(1234.5, { format: 'js-number' })
// "1234.50"        — no separators (inputs / round-trips)

Exchange Pay amount clamping in the React hooks uses format: 'js-number' when writing back into the input.

Defaults (setFormatDefaults) ​

Call once at startup so standalone formatters and the SDK’s formatted.* fields share the same rules. Per-call args still win. getTokenDisplayDecimals returning undefined falls through to the SDK token table.

ts
import { Network, TokenSymbol } from '@swapped/connect-sdk'
import { setFormatDefaults } from '@swapped/connect-sdk/format'

setFormatDefaults({
  fiatDecimals: 2,
  maxFiatDecimals: 2,
  firstNonZeroDecimal: true,
  firstNonZeroDecimalInput: false,
  getTokenDisplayDecimals: (token, network) => {
    if (token === TokenSymbol.ETH) return 8
    if (token === TokenSymbol.USDT && network === Network.Bsc) return 4
    return undefined
  },
})

fiatDecimals is display only (formatCurrencyAmount, formatted.fiatValue). maxFiatDecimals is for amount inputs (useDualAmountInput, convertCryptoToFiat). Per-call maxFiatDecimals / decimals still wins.

firstNonZeroDecimal is display only (labels / formatted.*). firstNonZeroDecimalInput is for amount inputs (useDualAmountInput crypto amountDisplay). Inputs default to false so dust stays at display decimals (0.0001 USDC → 0) even when display expansion is on.

Cash App and Exchange Pay always use 2 fiat decimals (USD cents) for both input and display. They ignore fiatDecimals / maxFiatDecimals.