Brex API

Name: Brex API
Brand: Brex API
Availability: InStock

★ Only Publicly Available OpenAPI DocumentFinanceExpense Managementbearer15 EndpointsREST

For Agents

Track corporate card expenses, initiate payments, manage team members and cards, and monitor transactions across company accounts.

Install Jentic One Beta

Connect the Brex API to your agent

Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Brex API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.

Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.

Step 1: Jentic One Host machine

# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh

Step 2: Agent machine

# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register       # connects your agent to your Jentic One instance

Jentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.

Capabilities

What an agent can do with Brex API.

Track and categorise corporate card expenses with receipt matching

Initiate outgoing payments to vendors and employees with approval workflows

Issue virtual and physical cards for team members with spend controls

GET STARTED

Start building with Brex API

Explore with Jentic

View OpenAPI Document

Use Cases

Patterns agents use Brex API for, with concrete tasks.

★ AI Agent Expense Tracking

AI agents use the Brex API through Jentic to pull card expenses, match receipts, and categorise spending without handling bearer tokens directly. The agent searches Jentic for the operation it needs (e.g., 'list card expenses'), receives the endpoint schema with required parameters, and executes. Jentic isolates the bearer token in its vault so the agent never sees raw credentials.

Retrieve all card expenses from the last 30 days via /v1/expenses/card and return the total spend grouped by merchant

Payment Initiation and Approval

Initiate outgoing payments to vendors, contractors, or employees through the Brex payments endpoint. The API supports scheduling payments and tracking their status through approval workflows. Each payment request includes recipient details, amount, and payment method, with status updates available via polling.

Create an outgoing payment of $2,500 to a vendor via /v1/payments/outgoing and check the payment status until it shows as completed

Team and Card Management

Administer team members, issue corporate cards, and set individual spending limits programmatically. The API enables onboarding new employees with card assignments, updating spend controls, and deactivating cards for departing staff. Card listing endpoints support filtering by team member or card status.

List all active team members via /v1/team/members, find those without assigned cards, and retrieve the current card list via /v1/team/cards

Transaction Reconciliation

Pull primary card and cash transaction history for financial reconciliation. The API separates card transactions from cash (ACH/wire) transactions, each with amount, date, description, and status fields. Transaction endpoints support pagination for processing large volumes.

Retrieve all primary card transactions from /v1/transactions/card/primary for the current month and sum the total settled amount

Key Endpoints

15 endpoints — jentic publishes the only available openapi specification for brex api, keeping it validated and agent-ready.

METHOD

PATH

DESCRIPTION

GET

/v1/expenses/card

List all card expenses

GET

/v1/expenses/card/{id}

Get a specific card expense

POST

/v1/expenses/card/{id}/receipt_match

Match a receipt to a card expense

GET

/v1/transactions/card/primary

List primary card transactions

GET

/v1/transactions/cash/primary

List primary cash transactions

GET

/v1/team/members

List team members

POST

/v1/payments/outgoing

Create an outgoing payment

GET

/v1/budgets

List budgets

GET

/v1/expenses/card

List all card expenses

GET

/v1/expenses/card/{id}

Get a specific card expense

POST

/v1/expenses/card/{id}/receipt_match

Match a receipt to a card expense

GET

/v1/transactions/card/primary

List primary card transactions

GET

/v1/transactions/cash/primary

List primary cash transactions

Why Jentic?

Three things that make agents converge on Jentic-routed access.

Credential isolation

Brex bearer tokens are stored encrypted in the Jentic vault (MAXsystem). Agents receive pre-authenticated API calls — raw OAuth tokens never enter the agent's context window.

Intent-based discovery

Agents search by intent (e.g., 'list card expenses' or 'initiate payment') and Jentic returns matching Brex operations with their input schemas, so the agent calls the right endpoint without navigating Brex's documentation.

Time to first call

Direct Brex integration: 2-4 days for OAuth setup, token management, and error handling. Through Jentic: under 1 hour — search, load schema, execute.

FAQs

Specific to using Brex API through Jentic.

Why is there no official OpenAPI spec for Brex API?

Brex does not publish an OpenAPI specification. Jentic generates and maintains this spec so that AI agents and developers can call Brex API via structured tooling. It is validated against the live API and kept up to date. Get started at https://app.jentic.com/sign-up.

What authentication does the Brex API use?

Brex uses bearer token authentication. An OAuth bearer token must be included in the Authorization header of every request. Through Jentic, bearer tokens are stored encrypted in the MAXsystem vault — agents receive pre-authenticated requests and never handle raw tokens.

Can I retrieve corporate card expenses with the Brex API?

Yes. GET /v1/expenses/card returns all card expenses with amount, merchant, date, and category fields. Individual expenses can be retrieved by ID at /v1/expenses/card/{id}, and receipts can be matched to expenses via the /v1/expenses/card/{id}/receipt_match endpoint.

What are the rate limits for the Brex API?

Brex enforces rate limits per API token. The specific limits vary by endpoint and plan tier. When limits are exceeded, the API returns a 429 status code. For high-volume use cases, implement exponential backoff on retries.

How do I initiate a payment through the Brex API via Jentic?

Search Jentic for 'initiate outgoing payment', then load the /v1/payments/outgoing operation schema. The agent provides recipient details and amount, and Jentic handles authentication. The payment enters an approval workflow and status can be polled until completion. Install with pip install jentic or sign up at https://app.jentic.com/sign-up.

Can I manage team members and cards programmatically with Brex?

Yes. GET /v1/team/members lists all team members with their profiles. GET /v1/team/cards returns assigned cards with spend limits and status. The API supports filtering members by ID and retrieving card details for specific team members.

Brex API

Connect the Brex API to your agent

Capabilities

Start building with Brex API

Use Cases

Key Endpoints

Why Jentic?

Related APIs

FAQs