Extended trading bot setup (2026): keys, testnet, fees and limits
Order-book perps (formerly X10); settlement moved from Starknet to Circle's Arc on Oct 22, 2026. Here's how to run a trading bot or AI agent on it without handing it more power than it needs. Every fact links Extended's own docs, checked Oct 30, 2026.
| Safety score | Safety 43% |
|---|---|
| Bot key | Signing key can also withdraw source |
| Testnet | Yes source |
| Base fees (maker / taker) | 0% / 0.025% source |
| Rate limits | 1,000 requests per minute per IP by default, up to 12,000 at high volume. source |
| Anyone can check an account's results | No (leaderboard only) source |
| Restricted | US, UK, Canada and more source |
| Builder codes | Builder codes: the builder fee goes 100% to the builder, paid daily. source |
| Referrals | Referral links after $10,000 of volume (points-based); fee-sharing affiliate tier is invite-only. source |
Set up a bot on Extended, step by step
- Make sure you're on the real site. Fake trading sites and bots copy every big exchange. Before you connect a wallet, use the official app at app.extended.exchange.
- Give the bot its own account. Put the bot in a separate sub-account or wallet with only the money it needs, so a bug or a leaked key can't reach the rest.
- Create the bot's key. There is no trade-only key here, so isolate the bot instead. The API key is read-only, but every order needs the account's Stark key, which can also withdraw and transfer. Use one of up to 10 sub-accounts per bot to limit what a leaked key reaches. docs
- Run it on testnet first. Sepolia testnet with daily test USDC. docs
- Stay inside the rate limits. 1,000 requests per minute per IP by default, up to 12,000 at high volume. docs
- Count the fees. Standard markets: 0% maker, 0.025% taker. docs
- Put limits outside the bot. A bot can't be trusted to police itself. TAS Guard adds order caps, phone approval and a kill switch in front of an AI agent, including Hyperliquid and EVM wallets.
AI agent tools
Experimental MCP server in the official Python SDK; it trades on production by default. source
Code and audits
Audits cover the old Starknet contracts; none found yet for the Arc contracts. source
Incidents, last 12 months
None found in official sources in the last 12 months.
FAQ
Can I run a trading bot on Extended?
Yes. Extended has an API for automated trading. The API key is read-only, but every order needs the account's Stark key, which can also withdraw and transfer. Use one of up to 10 sub-accounts per bot to limit what a leaked key reaches.
Does Extended have a testnet?
Sepolia testnet with daily test USDC.
Can a Extended API key withdraw my funds?
The API key is read-only, but every order needs the account's Stark key, which can also withdraw and transfer. Use one of up to 10 sub-accounts per bot to limit what a leaked key reaches.
Can US residents use Extended?
No. Extended's terms restrict: US, UK, Canada, Hong Kong, Panama and several sanctioned places.
What are Extended's trading fees for bots?
Standard markets: 0% maker, 0.025% taker.