You need a Just subscription that includes the FX Index, and a Claude account.
01
Settings → Connectors
02
Add custom connector
03
https://mcp.gojust.com/mcp
04
Sign in with Just
OAuth · Claude never holds your Just password
About a minute. It answers from the trade data already in your account, so there is
nothing to upload first.
If setup fails
No "Add custom connector" optionYour Claude admin can turn custom connectors off
Sign-in loopsAllow third-party cookies from accounts.gojust.com
Network blockedAllow mcp.gojust.com, accounts.gojust.com and claude.ai
There is no test account and no shared login. Your IT team connects as one of your own users.
If you are still stuck, write to product@gojust.com.
02 · What to ask
Ask in your own words.
There is no syntax to learn. Claude works out which Just tool answers the question, calls it, and reads the figures back to you in the same chat.
Three questions in Claude, answered from Just. The last builds an HTML report. Illustrative, fictional company.
"What did FX cost us over the last 12 months?"
Period
"Which bank is most expensive for us, and by how much?"
By bank
"How do our EURNOK forwards compare to the Just Cost Index?"
Vs benchmark
"Show our trades with Nordea in March."
Trade list
"For our Swedish entity alone, what did FX cost us?"
One entity
"I have a trade confirmation to upload."
Upload
The only case where a file goes to Just.
You ask
It does
A question about your FX costs
→
Answers, from the figures in your Just account
A question outside FX
→
Declines. It only answers questions about FX cost
About a period not yet uploaded
→
Reports it. It names the missing period, and never counts it as zero cost
To place, change or cancel a trade, or to move money
→
Refuses. The connector is read-only
03 · The boundary
Your words never leave Claude.
A connector request is not a copy of your chat. Claude reads your question, picks a tool, and sends that tool a handful of named fields. Everything else stays where you typed it.
In Claude · your conversation
What crosses
At Just · your account
Your words
"What did FX cost us over the last 12 months?"
Never sent
Claude turns it into a request
date rangecurrency pairentity
Free text · no such field
Your trades
figures, from your trades
Your figures
You attach a document
trade confirmation
The one exception · sent only when you upload it
Parsed, as in the app
You see the same figures you see when you log in to Just. The connector cannot reach
another customer's trades. Full detail in the connector privacy notice.
04 · Access
Included with the FX Index.
The connector is in beta and in production use today. It is included with an FX Index subscription. There is no separate charge and no waiting list.
If your company does not use Just yet, the connector has nothing to read. We do not offer a sample dataset. The connector reads your trades, and nobody else's. Start at signup.gojust.com.
Questions about the connector go to product@gojust.com. We aim to reply within one working day.