New Exchange Integration

Scaffold a new exchange in ts/src/<id>.ts (REST) and optionally ts/src/pro/<id>.ts (WebSocket).

Read first: wiki/Requirements.md (mandatory unified methods) and CONTRIBUTING.md (transpiler rules). The CCXT root CLAUDE.md is the contributor guide.

Inputs

• <id>: lowercase exchange id, no separators (e.g. mynewex)
• <Name>: human-readable name (e.g. My New Exchange)
• API docs URL(s)
• Whether the exchange has a testnet/sandbox

Step 1 — Pick a reference exchange

Don't write from scratch. Copy a similar exchange that's already certified and adapt it.

Style	Reference
Spot + futures, signed REST	ts/src/binance.ts, ts/src/okx.ts
Spot only	ts/src/kraken.ts, ts/src/coinbase.ts
Derivatives focus	ts/src/bybit.ts, ts/src/bitmex.ts
Decentralised / on-chain signing	ts/src/hyperliquid.ts, ts/src/dydx.ts
WebSocket reference	ts/src/pro/binance.ts, ts/src/pro/okx.ts

Open the reference next to your new file and pattern-match — never invent new conventions.

Step 2 — Create ts/src/<id>.ts

Skeleton:

import Exchange from './abstract/<id>.js';
import { /* errors needed */ } from './base/errors.js';
import { Precise } from './base/Precise.js';
import type { /* types needed */ } from './base/types.js';

export default class <id> extends Exchange {
    describe (): any {
        return this.deepExtend (super.describe (), {
            'id': '<id>',
            'name': '<Name>',
            'countries': [ 'XX' ],
            'rateLimit': 1000,        // ms between requests
            'version': 'v1',
            'certified': false,
            'pro': false,             // flip to true when pro/<id>.ts exists
            'has': {
                // start everything false; flip to true as you implement
                'CORS': undefined,
                'spot': true,
                'margin': false,
                'swap': false,
                'future': false,
                'option': false,
                'fetchMarkets': true,
                'fetchCurrencies': true,
                'fetchTicker': true,
                'fetchTickers': false,
                'fetchOrderBook': true,
                'fetchTrades': true,
                'fetchOHLCV': false,
                'fetchBalance': true,
                'createOrder': true,
                'cancelOrder': true,
                'fetchOrder': true,
                'fetchOpenOrders': true,
                'fetchOrders': false,
                'fetchClosedOrders': false,
                'fetchMyTrades': true,
                'fetchDeposits': false,
                'fetchWithdrawals': false,
                'withdraw': false,
            },
            'urls': {
                'logo': 'https://...',
                'api': {
                    'public': 'https://api.<id>.com',
                    'private': 'https://api.<id>.com',
                },
                'test': {                              // OPTIONAL — only if testnet exists
                    'public': 'https://testnet.<id>.com',
                    'private': 'https://testnet.<id>.com',
                },
                'www': 'https://<id>.com',
                'doc': [ 'https://docs.<id>.com' ],
                'fees': 'https://<id>.com/fees',
            },
            'api': {
                'public': {
                    'get': [
                        'symbols',
                        'ticker/{pair}',
                        'orderbook/{pair}',
                    ],
                },
                'private': {
                    'get': [ 'account', 'orders' ],
                    'post': [ 'order' ],
                    'delete': [ 'order/{id}' ],
                },
            },
            'requiredCredentials': {
                'apiKey': true,
                'secret': true,
                // 'password': true,        // for passphrase-based exchanges
                // 'walletAddress': true,   // for on-chain
                // 'privateKey': true,
            },
            'fees': {
                'trading': {
                    'tierBased': false,
                    'percentage': true,
                    'maker': 0.001,
                    'taker': 0.001,
                },
            },
            'precisionMode': /* TICK_SIZE | DECIMAL_PLACES | SIGNIFICANT_DIGITS */,
            'options': {
                // exchange-specific defaults
            },
            'exceptions': {
                'exact': {
                    // 'ERROR_CODE': BadRequest,
                },
                'broad': {
                    // 'invalid signature': AuthenticationError,
                },
            },
        });
    }

    // implement the unified methods you flipped on in `has`
    async fetchMarkets (params = {}): Promise<Market[]> { /* ... */ }
    parseMarket (market: Dict): Market { /* ... */ }
    async fetchTicker (symbol: string, params = {}): Promise<Ticker> { /* ... */ }
    parseTicker (ticker: Dict, market: Market = undefined): Ticker { /* ... */ }
    // ...

    sign (path, api = 'public', method = 'GET', params = {}, headers = undefined, body = undefined) {
        // build URL, sign request — use this.hmac, this.jwt, this.ecdsa, never external libs
    }

    handleErrors (httpCode, reason, url, method, headers, body, response, requestHeaders, requestBody) {
        // throw the right exception based on response
    }
}

Step 3 — Define implicit API methods

URLs in the api block become methods automatically:

• 'symbols' → this.publicGetSymbols(params)
• 'ticker/{pair}' → this.publicGetTickerPair({ pair: market['id'] })
• 'orders' under private.get → this.privateGetOrders(params)

Don't write explicit HTTP wrappers. After listing the URL in api, run npm run emitAPITs to regenerate ts/src/abstract/<id>.ts (the auto-typed declarations).

Step 4 — Docstrings on every public method

Every public method needs a JSDoc block. The transpilers convert it to native docstrings in Python/PHP/C#/Go, and npm run build-docs produces wiki entries from them. Pattern:

/**
 * @method
 * @name <id>#fetchMyTrades
 * @description fetches all completed trades made by the user
 * @see https://docs.<id>.com/api/trades                 // spot
 * @see https://docs.<id>.com/api/derivatives/trades     // swap
 * @param {string} symbol unified market symbol
 * @param {int} [since] earliest timestamp in ms
 * @param {int} [limit] maximum number of trades to return
 * @param {object} [params] extra parameters specific to the exchange API endpoint
 * @param {int} [params.until] latest timestamp in ms
 * @returns {object[]} a list of [trade structures](https://docs.ccxt.com/#/?id=trade-structure)
 */
async fetchMyTrades (symbol: Str = undefined, since: Int = undefined, limit: Int = undefined, params = {}): Promise<Trade[]> {
    // ...
}

Rules: lowercase @description, @param {object} [params] always present, document every params.<key> you read in the body, link @returns to the manual structure. See CLAUDE.md §7 for the full ruleset.

Step 5 — Required parsers

For every fetch method, write a matching parser. The parser is what makes output uniform across all exchanges:

Fetch method	Parser	Validator (test)
fetchMarkets	parseMarket	ts/src/test/Exchange/base/test.market.ts
fetchCurrencies	parseCurrency	test.currency.ts
fetchTicker	parseTicker	test.ticker.ts
fetchOrderBook	base parseOrderBook	test.orderBook.ts
fetchTrades, fetchMyTrades	parseTrade	test.trade.ts
fetchOHLCV	parseOHLCV	test.ohlcv.ts
fetchBalance	parseBalance	test.balance.ts
createOrder, fetchOrder, fetchOpenOrders	parseOrder	test.order.ts
fetchPositions	parsePosition	test.position.ts

Parsing rules (also in CLAUDE.md §7):

• Always safeString first, parse with Precise for math, finalise with parseNumber only at the return.
• Symbol resolution: this.safeSymbol(marketId, market) — never put exchange-specific ids into unified output.
• Time: convert seconds → ms using safeTimestamp; everything in unified output is ms.

Step 6 — Static fixtures (TDD)

Capture a request/response fixture as soon as a method works once. Re-run on every change.

# request fixture (URL/body assertion) — NO HTTP
node cli.js <id> fetchTicker BTC/USDT --report
# response fixture (parser assertion) — NO HTTP
node cli.js <id> fetchTicker BTC/USDT --response

Paste each methods.<methodName> entry into ts/src/test/static/request/<id>.json or ts/src/test/static/response/<id>.json. Then run:

npm run request-tests
npm run response-tests

These tests run in all five languages and are your primary regression net.

Step 7 — Verify in all languages

A new exchange means thousands of new lines in Python, PHP, C#, Go and Java. The transpilers must like all of it.

npm run lint
npm run tsBuild
npm run transpile          # → Python, PHP
npm run transpileCS        # → C#
npm run buildCS
npm run transpileGO        # → Go
npm run buildGO
npm run check-python-syntax
npm run check-php-syntax
npm run id-tests
npm run request-tests
npm run response-tests

Then a live smoke test on at least one public method per language:

npm run cli.ts -- <id> fetchTicker BTC/USDT --verbose
npm run cli.py -- <id> fetchTicker BTC/USDT --verbose
npm run cli.php -- <id> fetchTicker BTC/USDT --verbose
npm run cli.cs -- <id> fetchTicker BTC/USDT --verbose
npm run cli.go -- <id> fetchTicker BTC/USDT --verbose

Step 8 — WebSocket support (optional)

If the exchange has WS, create ts/src/pro/<id>.ts. It must extends <id>Rest and add watch* methods. Reference: ts/src/pro/binance.ts. Flip 'pro': true in REST describe().

Step 9 — Update user-facing docs

A new exchange means new public surface area. Update the touchpoints listed in CLAUDE.md §8:

• wiki/Manual.md doesn't usually list per-exchange specifics, but add a section if your exchange introduces a new pattern (e.g. a new auth scheme, new params).
• Verify examples/ts/<id>-example.ts has at least one runnable snippet (transpiled to other languages by npm run tsBuildExamples).
• The end-user skills under .claude/skills/ccxt-{typescript,python,php,csharp,go}/ mention "all 100+ exchanges" — usually no edit needed unless your exchange has unique credential requirements (e.g. wallet/private key) worth calling out.
• npm run build-docs regenerates wiki entries from your JSDoc — run it once and inspect the output.

Step 10 — PR

Title: feat(<id>): add <Name> integration. Description follows the template in CLAUDE.md §11 — list every test you ran with results, and reference any related issue/PR.

Output checklist

• ts/src/<id>.ts written (uses Precise, safeString*, safeSymbol)
• Every public method has a JSDoc block (CLAUDE.md §7)
• 'has' flags accurately reflect implemented methods
• 'urls.test' set if exchange has a testnet
• 'requiredCredentials' matches what sign() actually uses
• All required parsers (parseMarket, parseTicker, parseTrade, parseOrder, …)
• handleErrors maps exchange error codes to CCXT exception classes
• ts/src/abstract/<id>.ts regenerated via npm run emitAPITs
• Static request + response fixtures for every implemented method
• npm run lint && npm run tsBuild && npm run transpile && npm run transpileCS && npm run transpileGO all pass
• npm run id-tests && npm run request-tests && npm run response-tests all pass
• Live smoke tested in TS + at least one transpiled language (cli.py, cli.cs, cli.go, …) with --verbose
• npm run build-docs ran, generated wiki entries look correct
• User-facing docs reviewed (CLAUDE.md §8) — Manual.md / examples / language skills if anything is non-standard
• PR title follows feat(<id>): ...; description fills CLAUDE.md §11 template

---

Prediction-market exchange variant

A prediction-market venue (Polymarket-style: events → markets → binary/categorical outcomes) does not extend Exchange — it lives in its own namespace. The differences from the checklist above:

1. File — ts/src/prediction/<id>.ts, class <id> extends PredictionExchange (import Exchange from ./abstract/prediction/<id>.js). Read .claude/rules/prediction-outcomes.md for the outcome-cache contract and ts/src/base/PredictionExchange.ts for the base helpers you inherit (loadOutcome/loadOutcomes/fetchOutcome/populateOutcomes/indexMarketOutcomes/safeOutcome/outcome, setEvents/getEvent/eventsList/applyEventFetchParams, parsePredictionTrades/parsePredictionOrders/parsePredictionPositions, safePrediction*).
2. describe() — has.prediction: true; address methods by an outcome handle, not a symbol. Implement fetchEvents(params) (scope-required via requireEventQuery) and, if the venue has a single-event endpoint, fetchEvent(id). Return Prediction* types from ts/src/base/types.ts (never base Ticker/Order/…). loadAllOutcomes defaults to false (a cache miss resolves one outcome via the base search-backed fetchOutcome); override fetchOutcome with a by-id fetch when the venue has one (see kalshi), and set loadAllOutcomes: true only when the whole universe is a single cheap request (see hyperliquid). No-arg fetchTickers() must throw ArgumentsRequired unless the venue has a true all-tickers endpoint.
3. Never call the base parseTrades/parseOrders/parsePositions — they filter by symbol and drop prediction rows. Use parsePredictionTrades/Orders/Positions. Never call buildOHLCVC (transpiles to a mangled name) — bucket candles inline.
4. Registration — npm run export-exchanges adds the id to exchanges.json prediction[] and wires ts/ccxt.ts / the per-language namespaces / README table. npm run emitAPI emits ts/src/abstract/prediction/<id>.ts. Add a skip-tests.json entry with preferredEventQuery (the harness's fetchEvents scope) and preferredPredictionOutcome (a tradeable handle — validated against the live listing).
5. Transpile — the scoped single-exchange transpilers auto-route a bare prediction-only id (tsx build/transpile.ts <id>, csharpTranspiler.ts <id>, goTranspiler.ts <id>). After editing PredictionExchange.ts you must also regen the base per language: tsx build/{transpile,csharpTranspiler,goTranspiler,javaTranspiler}.ts --baseClass. Any base→override call (like fetchOutcome) must be registered in VIRTUAL_BASE_METHODS in build/goTranspiler.ts or Go won't dispatch it.
6. Test — node run-tests <id> --js --prediction --private (add --sandbox for demo hosts like kalshi). Static fixtures live in the normal flat ts/src/test/static/{request,response}/<id>.json; the python/php sync harness skips prediction (they carry "asyncOnly": true).