Contamos lets AI assistants write to a shared, multi-currency ledger
The Uruguay-operated product supports Claude and ChatGPT, but its records depend on users entering transactions or reviewing imported bank statements.
By RuntimeWire Staff · Published
Primary source: Contamos
Why it matters
Contamos puts AI write access inside a shared financial ledger, while leaving bank synchronization and transaction accuracy in users' hands.
The Contamos ledger lets people ask an AI assistant about shared finances and add transactions to the same record. Its bet is that assistants can make bookkeeping easier without the company first connecting to users' bank accounts - a choice that also leaves the ledger only as complete as the information people put into it.
Contamos is operated by Qube SAS, which identifies itself as established in Uruguay in its privacy policy. The product is designed for people who manage money together: a couple, household, group of flatmates or shared project. Each team records income, expenses and transfers in one ledger, with separate balances for euros, dollars, bitcoin and other enabled currencies.
An assistant with permission to edit
The product connects to Claude, ChatGPT and other compatible assistants through a remote Model Context Protocol server. Once connected, an assistant can read balances and reports, answer questions in plain language, and create, edit or delete transactions. It can also import a statement supplied by the user; Contamos says the assistant presents a dry run for review before making those entries.
Contamos gives an assistant a role inside a shared ledger, where a change affects the record everyone on that team sees. The assistant documentation says actions follow the connected user's permissions, assistant-made changes appear in the activity log, which is a Pro feature, and the user can disconnect an assistant from settings. The assistant is instructed to ask before changing or deleting recorded data.
The assistant acts as the user, not as a separate read-only guest. Contamos also says financial information read by an assistant goes to the provider of that AI service, under that provider's own terms and privacy policy. Users therefore need to consider both the permissions they grant Contamos and the data handling of the assistant they choose.
A ledger, not a bank feed
Contamos does not directly connect to bank accounts or automatically fetch transactions. Users enter movements themselves or provide a statement for the assistant to process. The approach avoids asking users to link bank credentials, but it trades automatic updates for manual upkeep and review. A missed entry remains missing; an imported statement still needs scrutiny.
Era Context also connects finance data to AI assistants through MCP, while describing bank-account aggregation as part of its service. Contamos focuses instead on a ledger shared among members, balances kept in their original currencies, and transactions recorded by people or an assistant they authorize. Those choices favor groups that want a common record over a live, automatically synchronized view of individual bank accounts.
The ledger stores the exchange rate for the day a transaction occurred, according to Contamos, so later records retain that historical rate rather than silently reflecting a newer conversion. Accounts can contain multiple currencies side by side; the product avoids collapsing them into a single headline balance. Categories and tags organize transactions, while monthly budgets are available on the paid plan.
Free access, paid limits
The free plan includes one team, up to two members, three accounts and six months of history. AI access is included. Contamos lists Pro at $2.50 per month, billed annually at $29.99, with unlimited teams, members, accounts and history, as well as budgets, recurring transactions, member roles and activity logs. Its pricing page says currencies, transactions and tags are unlimited on both plans.
Contamos's homepage says its Product Hunt launch is scheduled for October 24th, 2026. The date is still ahead: the product page was already offering a free account as of October 7th. Its free tier lets prospective users try the central proposition before the listing date.
For Contamos, the hard part will be earning enough trust for people to let an assistant write to records that several people rely on. The product's permissions and review step address that concern at the interface level. Its business still depends on users keeping the underlying ledger accurate - a deliberately narrower promise than automatically collecting every bank transaction, and one the product will have to make convenient enough to sustain.