Connectors · Accounting & finance

Brex MCP server for AI agents.

actionlake is an MCP gateway: one remote MCP server that connects Claude and other MCP clients to Brex and the rest of your systems. It gives your agent 115 Brex actions (60 reads, 39 writes and 16 that wait for a confirmation) and holds the Brex credential itself, so the agent never does. It paces Brex's limits and records every call.

Connect Brex free See pricing

100,000 free calls a month. No card, no email, no password: press Start a free sandbox on the next screen and keep the key it shows you.

claude mcp add --transport http actionlake https://connect.actionlake.com/mcp

115actionsin one signed file
60readlook, never change
39writecreate and update
16wait for a yesdestructive, confirmed first

Set up

Connect Brex in three steps.

01
Add actionlake to Claude.
Run the command once in Claude Code; its consent page can create a free sandbox: 100,000 calls a month, no card. In the Claude app, add a custom connector with the URL below and paste your key on the consent page. Creating a new sandbox from the Claude app is not yet tested by us.
https://connect.actionlake.com/mcp
02
Connect Brex.
Bearer token. No consent screen: your agent can connect it for you, but the key then passes through your chat. To keep it out of the model's context, paste it in the console instead. actionlake stores what you paste write-only, sealed under your tenant's key.
- api_tokenBrex user token: an account or card admin opens dashboard.brex.com > Developer > Settings > Create Token and picks…
```
account { op: "connections.requirements", service: "brex" }
# free: exactly what to paste, and what is found for you
```

Make the first call. Check before a write.

Ask in plain words; Claude picks the action. Before anything changes, check validates the call and prices it, for free.

do    { action: "brex.transfers.list" }# lists transfers · read · 1 upstream callcheck { action: "brex.transfers.create", input: { … } }# free: inputs, permissions, cost and confirmations, nothing sent

Brex at a glance

Sign-in: Bearer token. No consent screen: your agent can connect it for you, but the key then passes through your chat. To keep it out of the model's context, paste it in the console instead.
You provide: api_token
Limits we pace to: 1,000 calls a minute, per connection
API covered: Brex (corporate cards, expenses, budgets, payments, banking, travel and team management) API Brex public APIs (Team v2, Payments v1, Transactions v2, Expenses v1, Budgets v1/v2, Fields v1, Travel v1, Webhooks v1, Onboarding v1, Accounting v3)api.brex.com
Built from: Brex's documentation, read 22 October 2026developer.brex.com developer.brex.com developer.brex.com
Service file: Version 1.0.0, signed (Ed25519)
Cached reads: 58 of 60 reads, for up to 5 minutes; a write clears what it affects
Shared entities: 7, so ask can line Brex up with your other systems
Data: Processed and stored in Sydney, Australia. No US region yet

Capabilities

What an AI agent can do in Brex.

115 actions in 35 areas. Every one carries its effect, so a key can allow the reads and hold the rest.

60readlook, never change
39writecreate and update
16destructivewait for a confirmation

Cards
9
3 read · 5 write · 1 destructive
Create card · Create secure email to send card number · List cards · Get card
Users
6
3 read · 3 write · 0 destructive
List users · Invite user · Get user · Update user
Webhook groups
6
2 read · 2 write · 2 destructive
Create Webhook Group · List Webhook Groups · Add Webhook Group Members · Get Webhook Group
Budgets
5
2 read · 2 write · 1 destructive
List Budgets · Create Budget · Get Budget · Update Budget
Budgets V1
5
2 read · 2 write · 1 destructive
Create Spend Limit · List Spend Limits · Get Spend Limit · Update Spend Limit
Card expenses
5
2 read · 3 write · 0 destructive
Update an expense · List card expenses · Create a new receipt match · Create a new receipt upload
Departments
5
2 read · 2 write · 1 destructive
List departments · Create department · Get department · Update department
Field values
5
2 read · 2 write · 1 destructive
Create custom field values · List custom field values · Get a field value · Update custom field values

27 more areas · 69 actions

Fields 5
Locations 5
Referrals 5
Spend limits 5
Titles 5
Vendors 5
Webhook subscriptions 5
Accounting integration 3
Accounting records 3
Cash accounts 3
Transfers 3
Budget programs 2
Cost centers 2
Expenses 2
Legal entities 2
Trip bookings 2
Trips 2
Card accounts 1
Card statements 1
Card transactions 1
Cash statements 1
Cash transactions 1
Company 1
Incoming transfers 1
Linked accounts 1
Webhook group members 1
Webhook secrets 1

Top actions

The Brex API, shaped for agents.

The ids your agent types, what each does, and the one name it shares with other systems. 27 of Brex's 27 action names are shared with at least one other connector, so an agent learns them once.

Action	What it does	Effect	Same name in
`brex.transfers.list`Lists transfers	Lists transfers.	read	`finance.payment.list`75 connectors
`brex.expenses.list`List expenses	List expenses.	read	`finance.expense.list`40 connectors
`brex.cash_accounts.list`List cash accounts	List cash accounts.	read	`finance.bank_account.list`35 connectors
`brex.users.list`List users	List users.	read	`identity.user.list`474 connectors
`brex.transfers.create`Create transfer	Create transfer.	destructive	`finance.payment.create`67 connectors
`brex.departments.list`List departments	List departments.	read	`hr.department.list`40 connectors
`brex.locations.list`List locations	List locations.	read	`hr.location.list`32 connectors
`brex.expenses.get`Get an expense	Get an expense.	read	`finance.expense.get`42 connectors
`brex.users.create`Invite user	Invite user.	write	`identity.user.create`262 connectors
`brex.cash_accounts.get`Get cash account by ID	Get cash account by ID.	read	`finance.bank_account.get`30 connectors
`brex.departments.create`Create department	Create department.	write	`hr.department.create`32 connectors
`brex.locations.create`Create location	Create location.	write	`hr.location.create`23 connectors

Try it

Prompts to paste into Claude.

Each one names the Brex actions it will call, so you know what it reads and what it changes before you send it.

Readread
List the payments recorded in Brex this month, largest first.
callsbrex.transfers.list
Writewrite
Invite user in Brex. Show me exactly what you will send before you save it.
callsbrex.users.create
Across systemsread
Which Brex companies have invoices in ConnectWise PSA, and how many each?
callsbrex.vendors.listconnectwise_manage.invoices.list

Across your systems

Brex, joined to the rest of your business.

One ask fetches from Brex and another system, joins the rows on the same customer on our side, and hands your agent the answer, not every row.

Which Brex companies have invoices in ConnectWise PSA, and how many each?
brex.vendors.list + connectwise_manage.invoices.list, on crm.company · ConnectWise PSA
Which Brex companies have tickets in HubSpot CRM, and how many each?
brex.vendors.list + hubspot_crm.tickets.list, on crm.company · HubSpot CRM

Also mapped by other connectorsidentity.user 517crm.company 227finance.payment 53hr.department 36finance.expense 26hr.location 26finance.bank_account 25

ask

ask {  intent: "which Brex companies have invoices in ConnectWise PSA, and how many each",  steps: [    { action: "brex.vendors.list", as: "co", input: {}, limit: 100, max_pages: 5 },    { action: "connectwise_manage.invoices.list", as: "inv", input: {}, limit: 100, max_pages: 5 },    { join: {        left: "co",        right: "inv",        on: "crm.company",        group_by: "co.name",        select: ["co.name", "count(inv.id) as invoices"]    } }  ]}

Example. Run it through check first: it validates the steps and prices them, and it is free.

Governance for Brex

Destructive actions wait for a yes.

16 Brex actions are destructive. These are all of them:

Create transferbrex.transfers.create
Delete departmentbrex.departments.delete
Delete locationbrex.locations.delete
Create incoming transferbrex.incoming_transfers.create
Delete a custom fieldbrex.fields.delete
Delete titlebrex.titles.delete
Delete vendor.brex.vendors.delete
Archive a Budgetbrex.budgets.archive
Terminate cardbrex.cards.terminate
Archive a Spend Limitbrex.budgets_v1.archive
Delete custom field valuesbrex.field_values.delete
Archive a Spend Limitbrex.spend_limits.archive
Delete Webhook Groupbrex.webhook_groups.delete
Unregister Webhookbrex.webhook_subscriptions.delete
Remove Webhook Group Membersbrex.webhook_groups.remove_members
Disconnect accounting integrationbrex.accounting_integration.disconnect

A destructive action runs only with confirm: true. Under the human policy the agent cannot confirm for itself: the run stops until a named person approves, in the console or from a signed link in an email. The cap on a key is refused before the call is sent, never after.

dobrex.departments.deleteconfirm_policy: human

Delete department?

intent: the user asked me to delete department

run suspended · waiting for a named person · key brex-agent cannot confirm itself

In the console, or from an emailed signed link.

a key for this connector

account {  op: "keys.create", name: "brex-agent",  allowed_actions: ["brex.*"], cap_calls: 2000,  confirm_policy: "human_for_writes",  approval_rules: [    { match: "brex.transfers.create", approver: "[email protected]" },    { match: "brex.departments.delete", approver: "[email protected]" },    { match: "brex.locations.delete", approver: "[email protected]" }  ]}

Illustrative. Scoped to Brex only, capped at 2,000 upstream calls, every write confirmed, and the destructive ones approved by a named person.

Cost

What Brex costs on actionlake.

Every Brex action is one upstream call, the only thing actionlake bills. Searching, check, cost, account and any call Brex refused with 401, 403, 429 or a 5xx are free. Paid plans start at US$49 a month for 250,000 calls, with overage from US$0.30 down to US$0.18 per 1,000.

1upstream call per actionall 115 Brex actions
115actions pageeach page of a long list is one call
58reads can be cacheda cache hit costs nothing
100,000calls a month, freepaid plans from US$49 a month for 250,000

See pricing

Action index

Every Brex action.

115 actions by area: the id your agent calls, what it does, and its effect.

Cards9

brex.cards.createCreate cardwrite
brex.cards.email_card_numberCreate secure email to send card numberwrite
brex.cards.getGet cardread
brex.cards.get_card_numberGet card numberread
brex.cards.listList cardsread
brex.cards.lockLock cardwrite
brex.cards.terminateTerminate carddestructive
brex.cards.unlockUnlock cardwrite
brex.cards.updateUpdate cardwrite

Users6

brex.users.addCreate userwrite
brex.users.createInvite userwrite
brex.users.getGet userread
brex.users.get_meGet current userread
brex.users.listList usersread
brex.users.updateUpdate userwrite

Webhook groups6

brex.webhook_groups.add_membersAdd Webhook Group Memberswrite
brex.webhook_groups.createCreate Webhook Groupwrite
brex.webhook_groups.deleteDelete Webhook Groupdestructive
brex.webhook_groups.getGet Webhook Groupread
brex.webhook_groups.listList Webhook Groupsread
brex.webhook_groups.remove_membersRemove Webhook Group Membersdestructive

Budgets5

brex.budgets.archiveArchive a Budgetdestructive
brex.budgets.createCreate Budgetwrite
brex.budgets.getGet Budgetread
brex.budgets.listList Budgetsread
brex.budgets.updateUpdate Budgetwrite

Budgets V15

brex.budgets_v1.archiveArchive a Spend Limitdestructive
brex.budgets_v1.createCreate Spend Limitwrite
brex.budgets_v1.getGet Spend Limitread
brex.budgets_v1.listList Spend Limitsread
brex.budgets_v1.updateUpdate Spend Limitwrite

Card expenses5

brex.card_expenses.getGet a card expenseread
brex.card_expenses.listList card expensesread
brex.card_expenses.receipt_matchCreate a new receipt matchwrite
brex.card_expenses.receipt_uploadCreate a new receipt uploadwrite
brex.card_expenses.updateUpdate an expensewrite

Departments5

brex.departments.createCreate departmentwrite
brex.departments.deleteDelete departmentdestructive
brex.departments.getGet departmentread
brex.departments.listList departmentsread
brex.departments.updateUpdate departmentwrite

Field values5

brex.field_values.createCreate custom field valueswrite
brex.field_values.deleteDelete custom field valuesdestructive
brex.field_values.getGet a field valueread
brex.field_values.listList custom field valuesread
brex.field_values.updateUpdate custom field valueswrite

Fields5

brex.fields.createCreate a custom fieldwrite
brex.fields.deleteDelete a custom fielddestructive
brex.fields.getGet custom fieldread
brex.fields.listList custom fieldsread
brex.fields.updateUpdate a custom fieldwrite

Locations5

brex.locations.createCreate locationwrite
brex.locations.deleteDelete locationdestructive
brex.locations.getGet locationread
brex.locations.listList locationsread
brex.locations.updateUpdate locationwrite

Referrals5

brex.referrals.createCreates a referralwrite
brex.referrals.document_uploadCreate a new document uploadwrite
brex.referrals.getGets a referral by IDread
brex.referrals.listList referralsread
brex.referrals.process_ein_documentProcess a delayed EIN document after uploadwrite

Spend limits5

brex.spend_limits.archiveArchive a Spend Limitdestructive
brex.spend_limits.createCreate Spend Limitwrite
brex.spend_limits.getGet Spend Limitread
brex.spend_limits.listList Spend Limitsread
brex.spend_limits.updateUpdate Spend Limitwrite

Titles5

brex.titles.createCreate titlewrite
brex.titles.deleteDelete titledestructive
brex.titles.getGet titleread
brex.titles.listList titlesread
brex.titles.updateUpdate titlewrite

Vendors5

brex.vendors.createCreate vendorwrite
brex.vendors.deleteDelete vendor.destructive
brex.vendors.getGet vendorread
brex.vendors.listLists vendorsread
brex.vendors.updateUpdate vendorwrite

Webhook subscriptions5

brex.webhook_subscriptions.createRegister Webhookwrite
brex.webhook_subscriptions.deleteUnregister Webhookdestructive
brex.webhook_subscriptions.getGet Webhookread
brex.webhook_subscriptions.listList Webhooksread
brex.webhook_subscriptions.updateUpdate Webhookwrite

Accounting integration3

brex.accounting_integration.createCreate accounting integrationwrite
brex.accounting_integration.disconnectDisconnect accounting integrationdestructive
brex.accounting_integration.reactivateReactivate accounting integrationwrite

Accounting records3

brex.accounting_records.getGet accounting record by IDread
brex.accounting_records.listQuery accounting recordsread
brex.accounting_records.report_export_resultsReport accounting export resultswrite

Cash accounts3

brex.cash_accounts.getGet cash account by IDread
brex.cash_accounts.get_primaryGet primary cash accountread
brex.cash_accounts.listList cash accountsread

Transfers3

brex.transfers.createCreate transferdestructive
brex.transfers.getGet transferread
brex.transfers.listLists transfersread

Budget programs2

brex.budget_programs.getGet Budget Programread
brex.budget_programs.listList Budget Programsread

Cost centers2

brex.cost_centers.getGet cost centerread
brex.cost_centers.listList cost centersread

Expenses2

brex.expenses.getGet an expenseread
brex.expenses.listList expensesread

Legal entities2

brex.legal_entities.getGet legal entityread
brex.legal_entities.listList legal entitiesread

Trip bookings2

brex.trip_bookings.getGet bookingread
brex.trip_bookings.listList trip bookingsread

Trips2

brex.trips.getGet tripread
brex.trips.listList tripsread

Card accounts1

brex.card_accounts.listList card accountsread

Card statements1

brex.card_statements.list_primaryList primary card account statements.read

Card transactions1

brex.card_transactions.list_primaryList transactions for all card accounts.read

Cash statements1

brex.cash_statements.listList cash account statements.read

Cash transactions1

brex.cash_transactions.listList transactions for the selected cash account.read

Company1

brex.company.getGet companyread

Incoming transfers1

brex.incoming_transfers.createCreate incoming transferdestructive

Linked accounts1

brex.linked_accounts.listLists linked accountsread

Webhook group members1

brex.webhook_group_members.listList Webhook Group Membersread

Webhook secrets1

brex.webhook_secrets.listList Webhook Secretsread

Questions

The Brex MCP server, answered.

Is there a Brex MCP server for Claude?

Yes. actionlake is an MCP gateway: a remote MCP server that gives Claude, or another MCP client, 115 Brex actions across cards, users, webhook groups and budgets, through the same eight tools it uses for every other connector. actionlake is independent; it is not made or endorsed by Brex.

What do I need to connect Brex?

Brex user token: an account or card admin opens dashboard.brex.com > Developer > Settings > Create Token and picks…. The free call account { op: "connections.requirements", service: "brex" } lists exactly what to paste.

Can an AI agent delete or change things in Brex?

Only if its key allows it, and only with an explicit confirmation. 16 Brex actions are destructive, including create transfer, delete department and delete location. Each runs only with confirm: true. Under the human confirm policy, or an approval rule on the key, the run waits until a named person approves it.

Will an AI agent use up my Brex API limit?

actionlake paces every call to the limits in the Brex service file: 1,000 calls a minute per connection. Repeated reads are answered from cache (58 Brex actions can be), which never reaches Brex.

What does a Brex action cost?

One upstream call, the only unit actionlake bills. A list that pages bills one call per page (115 Brex actions page). Cache hits, searches, dry runs and calls Brex refused with 401, 403, 429 or a 5xx are free. The Free plan includes 100,000 calls a month with no card. Paid plans start at US$49 a month for 250,000 calls, with overage from US$0.30 down to US$0.18 per 1,000.

Which Brex API does it cover?

The Brex (corporate cards, expenses, budgets, payments, banking, travel and team management) API Brex public APIs (Team v2, Payments v1, Transactions v2, Expenses v1, Budgets v1/v2, Fields v1, Travel v1, Webhooks v1, Onboarding v1, Accounting v3) at api.brex.com. It is built from Brex's documentation as read on 22 October 2026. 115 actions in 35 areas, each one in the signed service file (version 1.0.0).

Can I combine Brex with my other systems?

Yes. ask joins Brex to ConnectWise PSA or HubSpot CRM on the same customer and returns the answer rather than every row. Brex maps crm.company, which 227 other connectors also map.

Does actionlake keep my Brex data, and where?

actionlake processes and stores data in Sydney, Australia; there is no US region yet. Reads may be cached for up to 5 minutes, and a write clears the reads it affects. Each run's request and response is kept, sealed, for your plan's trace window: 1 day on Free, 3 days on Starter, 7 days on Pro, 14 days on Team, 30 days on Business and 30 days on Enterprise. Your Brex credential is sealed under your tenant's key, never logged and never returned. Your traffic is not used to train models.

Which AI clients can use it?

Claude Code, tested by us end to end, and the Claude app as a custom connector, tested by us with an existing key. Other MCP clients that support remote servers over Streamable HTTP (MCP revisions 2025-06-18 and 2025-11-25) and OAuth dynamic client registration, or a bearer header, should connect the same way; we have not tested them. Or plain REST, under the same action names.

Give your agent Brex today.

Connect Brex free See pricing

Start free - 100,000 calls/month, no card. No signup. Hard caps on every key. Cached answers are free.

Brex MCP server for AI agents.

Connect Brex in three steps.

Add actionlake to Claude.

Connect Brex.

Make the first call. Check before a write.

What an AI agent can do in Brex.

Cards

Users

Webhook groups

Budgets

Budgets V1

Card expenses

Departments

Field values