How to trade with eustella (Europe)
Short answer: eustella added MCP connectors on 14 October 2026. Open Settings → Connectors → Add custom connector, paste
https://api.openfinance.tech/agent/mcp, then sign in with OAuth or add your OpenFinance API key. eustella asks before every call to a custom server, so each trade needs your OK.
MCP URL: https://api.openfinance.tech/agent/mcp · HTTP streamable · works with any MCP client · one URL, no SDK · no KYC · fund with a debit card.
How eustella connects to tools
eustella is a European, mobile-first AI agent (web, iOS, Android) that runs open-weight models on EU infrastructure. Since 14 October 2026 it supports connectors built on MCP: a curated catalog of 25+ services plus Add custom connector for any remote MCP server you host or know about. Custom servers can use no sign-in, an API key, or OAuth account sign-in, and eustella opens a secure form for keys so they never pass through the chat. For servers you add yourself, eustella asks before every single tool call and ignores the server's own read-only labels. You can set auto-run per connector (Off, Read-only, All tools) and toggle individual tools. Connectors carry a Beta label. eustella has a free tier and paid plans (Comet, Star, Cosmos).
Set up eustella in under 60 seconds
- Open eustella on the web (app.eustella.com) or in the iOS/Android app and go to Settings → Connectors.
- Choose Add custom connector.
- Name it OpenFinance and paste the MCP URL
https://api.openfinance.tech/agent/mcp. - Pick OAuth and sign in to OpenFinance, or pick API key and paste your
open_…key in the secure form. - In a chat, ask eustella for the BTC price through OpenFinance and approve the call to confirm it works.
Server URL: https://api.openfinance.tech/agent/mcp
Transport: Streamable HTTP
Auth: OAuth (metadata at /.well-known/oauth-authorization-server)
or API key -> header x-api-key: open_...
Get an API key at openfinance.tech (sidebar → External AI). Then fund: open the OpenFinance app, tap Add funds, pay with a debit card, or send crypto to your agent wallet. No brokerage application, no KYC on OpenFinance.
What eustella can trade through OpenFinance
| Market | What you can do | Examples |
|---|---|---|
| Crypto spot | Buy/sell on Solana, Base and 40+ EVM chains | BTC, ETH, SOL, HYPE |
| Crypto perps with leverage | Long/short on Hyperliquid | BTC 5x, ETH 10x |
| Onchain stocks (spot) | Tokenized stocks, incl. Robinhood Chain | TSLA, NVDA, AAPL |
| Forex | FX tokens onchain and Hyperliquid FX perps | EUR/USD |
| Memecoins | Trending Solana and Base tokens | BONK, WIF, PEPE |
| Prediction markets | Polymarket odds, orders, positions | elections, sports, crypto |
| Options | In the OpenFinance app only, through your connected IBKR or Robinhood account (not through the MCP) | HYPE |
Prompts to try in eustella
- “Using OpenFinance, what's my balance, and what are BTC, ETH and SOL doing today?”
- “Using OpenFinance, go long BTC 5x with €50 on Hyperliquid and set a stop 4% below entry.”
- “Using OpenFinance, buy $25 of tokenized NVDA and $25 of TSLA.”
- “Using OpenFinance, show the top trending Solana memecoins and buy $10 of the one with the most volume.”
- “Using OpenFinance, what are the Polymarket odds on the next ECB decision? Bet $10 on the favourite.”
OpenFinance vs Alpaca for eustella users
| OpenFinance | Alpaca | |
|---|---|---|
| KYC | None to start (onramp may verify ID) | Brokerage account application with identity verification |
| Setup | One MCP URL, about 60 seconds | Make an account and create your API key (under a minute) |
| Funding | Debit card onramp, or send crypto | Bank transfer / ACH |
| Markets | Crypto spot + perps, onchain stocks, forex, memecoins, Polymarket | US stocks, ETFs, options, crypto |
| Paper trading | No | Yes |
Alpaca is a regulated US broker with its own MCP server and paper trading, a good fit if you want US-listed shares and listed options. OpenFinance is faster for eustella: no account approval, one URL, and onchain markets Alpaca doesn't offer (perps, memecoins, Polymarket).
Frequently asked questions
Can eustella trade crypto? Yes, once OpenFinance is added as a custom connector. eustella calls OpenFinance's MCP tools to quote, buy, sell and open perps, and asks you to approve each call.
Where do I add an MCP server in eustella? Settings → Connectors → Add custom connector, on the web and in the mobile apps. You can also ask eustella in chat to connect a service.
Does eustella support API keys or only OAuth? Both, per eustella: servers with no sign-in, API-key servers and OAuth servers. Keys go into a secure form, not the chat.
Will eustella place trades without asking? Not by default. For custom servers eustella asks before every single call, and you choose the auto-run mode per connector.
Is eustella available outside the EU? eustella is built for Europe and keeps data in EU data centres; accounts are created at app.eustella.com or in the app stores.