Browse & Filter Orders

Fetch live maker orders from the OptionBook and narrow them down to exactly what you want to trade.

fetchOrders()

Returns all currently available orders from the Book indexer. No signer required.

import { ethers } from 'ethers';
import { ThetanutsClient } from '@thetanuts-finance/thetanuts-client';

const provider = new ethers.JsonRpcProvider('https://mainnet.base.org');
const client = new ThetanutsClient({ chainId: 8453, provider });

const orders = await client.api.fetchOrders();
console.log(`Found ${orders.length} orders`);

Each element is an OrderWithSignature object. The most useful fields are on order.order (the on-chain struct) and order.rawApiData (enriched metadata from the indexer including Greeks).

OrderWithSignature shape

// Key fields you'll use most often
const o = orders[0];

o.order.expiry          // bigint — Unix timestamp
o.order.availableAmount // bigint — maker's collateral budget (NOT contract count)
o.order.price           // bigint — price per contract (8 decimals)
o.order.isBuy           // boolean — from the maker's perspective

o.rawApiData?.greeks?.delta  // number — delta
o.rawApiData?.greeks?.iv     // number — implied volatility (0–1)
o.rawApiData?.greeks?.theta  // number — theta per day
o.rawApiData?.isCall         // boolean
o.rawApiData?.strikes        // bigint[] — strike(s) in 8 decimals
o.rawApiData?.underlying     // 'ETH' | 'BTC'

availableAmount is the maker's collateral budget, not the number of contracts. A 10,000 USDC budget at a $95,000 strike gives you roughly 0.105 contracts. Always use previewFillOrder() to see the actual contract count.

filterOrders()

Fetch orders pre-filtered by the API. Saves you from loading the full order list when you already know what you want.

// Only CALL orders that haven't expired
const callOrders = await client.api.filterOrders({
  isCall: true,
  minExpiry: Math.floor(Date.now() / 1000),
});

// Only PUT orders
const putOrders = await client.api.filterOrders({ isCall: false });

Filter criteria:

Field	Type	Description
isCall	boolean	true for CALLs, false for PUTs
minExpiry	number	Minimum expiry timestamp (Unix seconds)

Finding a specific order

After fetching, use standard array methods to locate the order you want:

const orders = await client.api.fetchOrders();
const now = BigInt(Math.floor(Date.now() / 1000));

// Find the first non-expired order
const order = orders.find((o) => o.order.expiry > now);
if (!order) throw new Error('No active orders found');

// Find a specific ETH PUT by strike
const ethPut2000 = orders.find(
  (o) =>
    o.rawApiData?.underlying === 'ETH' &&
    !o.rawApiData?.isCall &&
    o.rawApiData?.strikes?.[0] === 200000000000n, // $2000 in 8 decimals
);

// Sort by price ascending
const byPrice = [...orders].sort((a, b) =>
  Number(a.order.price - b.order.price)
);

OptionBook API methods

Full list of read methods available via client.api for the OptionBook side:

Method	Description
fetchOrders()	All available orders
filterOrders(criteria)	Orders matching filter criteria
getUserPositionsFromIndexer(address)	User positions on the book side
getUserHistoryFromIndexer(address)	Trade history on the book side
getBookOption(optionAddress)	Single book option with PnL
getReferrerStatsFromIndexer(address)	Referrer stats (book side)
getBookProtocolStats()	Protocol stats with 24h/7d/30d windows
getBookDailyStats()	Daily time series data
getStatsFromIndexer()	Legacy totals (uniqueUsers, openPositions)

Greeks from order data

const orders = await client.api.fetchOrders();

for (const order of orders) {
  if (order.rawApiData?.greeks) {
    const { delta, iv, gamma, theta, vega } = order.rawApiData.greeks;
    console.log(`Delta: ${delta.toFixed(4)}`);
    console.log(`IV: ${(iv * 100).toFixed(1)}%`);
    console.log(`Theta: ${theta.toFixed(4)}/day`);
  }
}

Greeks may be null for illiquid options or very short-dated options near expiry.

---

Indexer stat helpers

Beyond order browsing, the client.api module exposes aggregate read endpoints backed by the same indexer. All are read-only.

// OptionBook market metadata (orderbook depth, last prices, expiry buckets)
const market = await client.api.getMarketData();

// OptionFactory (RFQ) state
const activeRfqs = await client.api.getFactoryRfqs('active');
const factoryStats = await client.api.getFactoryStats();

// Per-referrer accrual on the OptionFactory side (paired with
// docs/rfq/referrals.md). Useful for dashboards and audit trails.
const referrerStats = await client.api.getFactoryReferrerStats(referrerAddress);

For protocol-wide aggregates, use client.api.getProtocolStats() (book + factory combined) or its scoped siblings getBookProtocolStats() / getFactoryProtocolStats(). Daily breakdowns are exposed via getDailyStats().

---

See Also

• Overview

• Preview Fills

• Fill Orders