Ask your corporate card, expense, banking, and travel data questions in plain language — under your existing Brex permissions.
Brex MCP server is a hosted integration for AI assistants that speak the Model Context Protocol. Brex's official remote MCP server gives assistants permission-scoped access to expenses, cards, spend limits, banking, bills, travel, and accounting records.
Brex's official remote MCP server gives assistants permission-scoped access to expenses, cards, spend limits, banking, bills, travel, and accounting records.
Once Brex is connected, these are the calls the assistant has available:
Expense and transaction search — Queries card expenses, transactions, and reimbursements with filters for date range, merchant, employee, department, compliance status, or spendCard and spend limit lookup — Returns card details and statuses plus remaining balance and period for spend limits. Card numbers are never exposedBanking and account balances — Reads business account balances and banking transactions including wires, ACH, checks, and transfersVendor and bill lookup — Retrieves vendors, bills, purchase orders, account balances, and vendor activity historyTravel bookings — Lists upcoming trips, flight and hotel bookings, group events, and travel policy compliance across a team or companyAccounting records — Reports the active accounting integration, GL accounts, and accounting records filtered by source type or review statusUser and department search — Searches users, departments, cost centres, and locations to support audits and onboarding reviewsStatement generation — Generates and downloads account statements in multiple formats for bookkeeping or period-end reportingExpense detail update — Updates memos, receipts, attendees, and spend limits on your own transactions onlyA Brex account with Developer API access enabled, an admin who has turned on Brex in AI assistants and accepted the Developer API agreement, and an MCP client supporting remote Streamable HTTP with OAuth.
Being a remote server, there is no local install. You register the endpoint with your client, authorise it once, and the tools appear.
Plenty of payments and commerce servers cover similar ground. The differences that matter in practice are scope of access and how much setup stands between you and a working tool call. Brex's toolset — Expense and transaction search, Card and spend limit lookup, Banking and account balances and 6 more — is a fair guide to whether it matches your workflow. It is maintained by Brex rather than a third party, which usually means auth handling and breaking changes are dealt with faster.
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Ask which of your expenses are missing receipts, then attach or annotate them without opening the dashboard.
Answer questions like what engineering spent on SaaS last quarter, or which merchants drove a department over its limit, without exporting reports.
Check account balances, look up bills and purchase orders, and review vendor activity while preparing a payables run.
Pull upcoming trips and bookings across the company and flag where they fall outside policy before the spend happens.
| Tool | What it does |
|---|---|
| Expense and transaction search | Queries card expenses, transactions, and reimbursements with filters for date range, merchant, employee, department, compliance status, or spend limit. |
| Card and spend limit lookup | Returns card details and statuses plus remaining balance and period for spend limits. Card numbers are never exposed. |
| Banking and account balances | Reads business account balances and banking transactions including wires, ACH, checks, and transfers. |
| Vendor and bill lookup | Retrieves vendors, bills, purchase orders, account balances, and vendor activity history. |
| Travel bookings | Lists upcoming trips, flight and hotel bookings, group events, and travel policy compliance across a team or company. |
| Accounting records | Reports the active accounting integration, GL accounts, and accounting records filtered by source type or review status. |
| User and department search | Searches users, departments, cost centres, and locations to support audits and onboarding reviews. |
| Statement generation | Generates and downloads account statements in multiple formats for bookkeeping or period-end reporting. |
| Expense detail update | Updates memos, receipts, attendees, and spend limits on your own transactions only. |
claude mcp add --transport http brex https://api.brex.com/mcpA Brex account with Developer API access enabled, an admin who has turned on Brex in AI assistants and accepted the Developer API agreement, and an MCP client supporting remote Streamable HTTP with OAuth.
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