HIP-4 SDK Utilities: Pricing, Coins, and Orderbook

The SDK exports a set of standalone utility functions alongside the main adapter. These functions have no side effects and no dependency on an initialized adapter instance - import and call them directly. They cover four areas: tick-aligned price formatting, market discovery and classification, coin name encoding, and orderbook cost estimation. Two stream constructors for live chart feeds are also covered here.

Pricing utilities

These functions handle Hyperliquid’s magnitude-based decimal precision and minimum order size constraints.

`computeTickSize(price)`

Returns the tick size for a given price using 5 significant figures.

import { computeTickSize } from "@outcome.xyz/hip4";

computeTickSize(0.55);    // 0.00001
computeTickSize(1.25);    // 0.0001
computeTickSize(100);     // 0.001

`roundToTick(price)`

Rounds a price to the nearest tick boundary.

import { roundToTick } from "@outcome.xyz/hip4";

roundToTick(0.55123);    // 0.5512 (rounded to nearest 0.0001)

`formatPrice(price)`

Formats a price as a tick-aligned string with trailing zeros stripped. Prices below 1 receive 4 decimal places.

import { formatPrice } from "@outcome.xyz/hip4";

formatPrice(0.5500);     // "0.55"
formatPrice(0.6512);     // "0.6512"
formatPrice(1.20);       // "1.2"

`stripZeros(str)`

Removes trailing zeros from a numeric string.

import { stripZeros } from "@outcome.xyz/hip4";

stripZeros("0.65000");   // "0.65"
stripZeros("1.0000");    // "1"

`getMinShares(markPx)`

Returns the minimum number of shares required to meet the 10 USDH minimum notional for a given mark price.

import { getMinShares } from "@outcome.xyz/hip4";

getMinShares(0.65);    // 29
getMinShares(0.10);    // 100

`MIN_NOTIONAL`

The minimum order size in USDH. Currently 10. Orders below this threshold are rejected before submission.

import { MIN_NOTIONAL } from "@outcome.xyz/hip4";

console.log(MIN_NOTIONAL);   // 10

Market discovery

These functions help you find and describe recurring HIP-4 markets from raw metadata.

`parseDescription(desc)`

Parses a pipe-delimited recurring market description string into a structured object.

import { parseDescription } from "@outcome.xyz/hip4";

parseDescription(
  "class:priceBinary|underlying:BTC|expiry:20260311-0300|targetPrice:69070|period:1d"
);
// {
//   class: "priceBinary",
//   underlying: "BTC",
//   expiry: Date,         // parsed UTC Date
//   targetPrice: 69070,
//   period: "1d"
// }

`discoverPriceBinaryMarkets(meta)`

Scans raw outcomeMeta and returns all outcomes that are recurring price binary markets.

import { discoverPriceBinaryMarkets } from "@outcome.xyz/hip4";

const markets = discoverPriceBinaryMarkets(outcomeMeta);

`periodMinutes(period)`

Converts a period string to its equivalent number of minutes.

import { periodMinutes } from "@outcome.xyz/hip4";

periodMinutes("1d");    // 1440
periodMinutes("1h");    // 60
periodMinutes("15m");   // 15

`formatMarketLabel(market)`

Returns a short human-readable label for a market, combining the underlying asset and period.

import { formatMarketLabel } from "@outcome.xyz/hip4";

formatMarketLabel(market);    // "BTC-1d"

`timeToExpiry(expiry)`

Returns a human-readable string describing how long until a market expires.

import { timeToExpiry } from "@outcome.xyz/hip4";

timeToExpiry(new Date("2026-03-11T03:00:00Z"));    // "2h 34m"

Market classification

These functions classify raw HIP-4 outcomes into typed HIP4Market objects.

`classifyOutcome(outcome, questions)`

Classifies a single outcome from the raw API response. Returns a HIP4Market with the appropriate type discriminant.

import { classifyOutcome } from "@outcome.xyz/hip4";

const market = classifyOutcome(outcome, questions);
// market.type === "defaultBinary" | "labelledBinary" | "multiOutcome" | "priceBucket"

`classifyAllOutcomes(meta)`

Classifies all outcomes from a full outcomeMeta response. Returns an array of HIP4Market objects.

import { classifyAllOutcomes } from "@outcome.xyz/hip4";

const markets = classifyAllOutcomes(outcomeMeta);

Coin helpers

HIP-4 uses a specific coin naming convention for order book lookups and order placement. These helpers encode and decode those identifiers.

Helper	Example output	Description
`sideCoin(outcomeId, sideIndex)`	`"#5160"`	Tradeable side coin string
`sideAssetId(outcomeId, sideIndex)`	`100005160`	Numeric asset ID for order wire format
`parseSideCoin(coin)`	`{ outcomeId: 516, sideIndex: 0 }`	Decode a side coin string
`outcomeCoin(outcomeId)`	`"@516"`	Outcome-level coin for price lookups

import { sideCoin, sideAssetId, parseSideCoin, outcomeCoin } from "@outcome.xyz/hip4"
sideCoin(516, 0);          // "#5160"
sideCoin(516, 1);          // "#5161"
sideAssetId(516, 0);       // 100005160
parseSideCoin("#5160");    // { outcomeId: 516, sideIndex: 0 }
parseSideCoin("invalid");  // null
outcomeCoin(516);          // "@516"

Use sideCoin output (e.g. "#5160") as the outcome field when calling hip4.trading.placeOrder. Use outcomeCoin output (e.g. "@516") for price lookups via hip4.marketData.fetchPrice.

Orderbook utilities

These functions estimate trade cost and potential return from token amounts and prices. Prices are expressed in cents (0–100 range) internally.

`computeEstimatedCost(tokenAmount, orderType, limitPriceCents, marketPriceCents?)`

Estimates the USDH cost for a given token amount. For limit orders, uses limitPriceCents. For market orders, uses marketPriceCents when provided, otherwise returns tokenAmount as a fallback.

import { computeEstimatedCost } from "@outcome.xyz/hip4";

computeEstimatedCost(100, "limit", 65, undefined);     // 65 USDH
computeEstimatedCost(100, "market", null, 65);          // 65 USDH

`computeTradeCost(params)`

Returns a TradeCostResult with all three values needed to display a trade preview.

import { computeTradeCost } from "@outcome.xyz/hip4";
import type { TradeCostResult } from "@outcome.xyz/hip4";

const result: TradeCostResult = computeTradeCost({
  tokenAmount: 100,
  orderType: "limit",
  limitPriceCents: 65,
  marketPriceCents: undefined,
});
// {
//   estimatedCost: 65,       // USDH to spend
//   potentialReturn: 100,    // max payout (= tokenAmount)
//   displayShares: 100,      // shares to show in UI
// }

`computePotentialReturn(tokenAmount)`

Returns the maximum payout for a given number of shares. Each share pays 1 USDH if the outcome resolves in your favor.

import { computePotentialReturn } from "@outcome.xyz/hip4";

computePotentialReturn(100);    // 100
computePotentialReturn(0);      // 0

Price feed streams

These constructors create continuously-updating chart feeds by merging historical candle data with real-time WebSocket ticks.

`createPriceFeed(marketData, marketId, onSnapshot, options?)`

Creates a live price feed for a single prediction market outcome. Returns an unsubscribe function.

import { createPriceFeed } from "@outcome.xyz/hip4";
import type { PriceFeedSnapshot, PriceFeedOptions } from "@outcome.xyz/hip4";

const options: PriceFeedOptions = {
  interval: "1h",          // candle interval; default "1h"
  lookbackMs: 7 * 24 * 60 * 60 * 1000,   // 7 days lookback; default 14 days
  sideIndex: 0,            // 0 = Yes side, 1 = No side; default 0
};

const unsub = createPriceFeed(
  hip4.marketData,
  "516",
  (snapshot: PriceFeedSnapshot) => {
    if (!snapshot.ready) return;
    renderChart(snapshot.candles);
    updateMidPrice(snapshot.currentMid);
  },
  options,
);

// Stop the feed when done
unsub();

PriceFeedSnapshot fields:

Field	Type	Description
`marketId`	`string`	The market ID passed to the constructor
`candles`	`PriceFeedCandle[]`	Full candle array (historical + live updates)
`currentMid`	`number	null`	Latest mid-price tick; may be newer than the last candle
`ready`	`boolean`	`false` until the initial historical candle fetch completes

`createPerpPriceFeed(client, coin, onSnapshot, options?)`

Creates a live price feed for a perpetual market coin (e.g. "BTC", "ETH"). Uses the candle WebSocket channel for authoritative OHLCV data and allMids for the initial mid-price.

import { HIP4Client, createPerpPriceFeed } from "@outcome.xyz/hip4";
import type { PerpPriceFeedSnapshot } from "@outcome.xyz/hip4";

const unsub = createPerpPriceFeed(
  hip4Client,
  "BTC",
  (snapshot: PerpPriceFeedSnapshot) => {
    if (!snapshot.ready) return;
    renderChart(snapshot.candles);
  },
  { interval: "1h", lookbackMs: 14 * 24 * 60 * 60 * 1000 },
);

unsub();

PerpPriceFeedSnapshot differs from PriceFeedSnapshot in its coin field (instead of marketId).

Get Started

Concepts

Adapters

Utilities

HIP-4 SDK Utilities: Pricing, Coins, and Orderbook

Pricing utilities

`computeTickSize(price)`

`roundToTick(price)`

`formatPrice(price)`

`stripZeros(str)`

`getMinShares(markPx)`

`MIN_NOTIONAL`

Market discovery

`parseDescription(desc)`

`discoverPriceBinaryMarkets(meta)`

`periodMinutes(period)`

`formatMarketLabel(market)`

`timeToExpiry(expiry)`

Market classification

`classifyOutcome(outcome, questions)`

`classifyAllOutcomes(meta)`

Coin helpers

Orderbook utilities

`computeEstimatedCost(tokenAmount, orderType, limitPriceCents, marketPriceCents?)`

`computeTradeCost(params)`

`computePotentialReturn(tokenAmount)`

Price feed streams

`createPriceFeed(marketData, marketId, onSnapshot, options?)`

`createPerpPriceFeed(client, coin, onSnapshot, options?)`

Get Started

Concepts

Adapters

Utilities

Documentation Index

​Pricing utilities

​computeTickSize(price)

​roundToTick(price)

​formatPrice(price)

​stripZeros(str)

​getMinShares(markPx)

​MIN_NOTIONAL

​Market discovery

​parseDescription(desc)

​discoverPriceBinaryMarkets(meta)

​periodMinutes(period)

​formatMarketLabel(market)

​timeToExpiry(expiry)

​Market classification

​classifyOutcome(outcome, questions)

​classifyAllOutcomes(meta)

​Coin helpers

​Orderbook utilities

​computeEstimatedCost(tokenAmount, orderType, limitPriceCents, marketPriceCents?)

​computeTradeCost(params)

​computePotentialReturn(tokenAmount)

​Price feed streams

​createPriceFeed(marketData, marketId, onSnapshot, options?)

​createPerpPriceFeed(client, coin, onSnapshot, options?)

Pricing utilities

`computeTickSize(price)`

`roundToTick(price)`

`formatPrice(price)`

`stripZeros(str)`

`getMinShares(markPx)`

`MIN_NOTIONAL`

Market discovery

`parseDescription(desc)`

`discoverPriceBinaryMarkets(meta)`

`periodMinutes(period)`

`formatMarketLabel(market)`

`timeToExpiry(expiry)`

Market classification

`classifyOutcome(outcome, questions)`

`classifyAllOutcomes(meta)`

Coin helpers

Orderbook utilities

`computeEstimatedCost(tokenAmount, orderType, limitPriceCents, marketPriceCents?)`

`computeTradeCost(params)`

`computePotentialReturn(tokenAmount)`

Price feed streams

`createPriceFeed(marketData, marketId, onSnapshot, options?)`

`createPerpPriceFeed(client, coin, onSnapshot, options?)`