Brex website screenshot

Brex

Brex is the first fully unified spend platform with global corporate cards, expense management, reimbursements, travel, and bill pay. Brex makes it easy for finance teams to control all of their spend, all in one place. Using the Brex API, you can power your internal tools and create custom workflows.

Brex publishes 3 APIs on the APIs.io network: Budget Programs API, Budgets API, and Spend Limits API. Tagged areas include Bill Pay, Corporate Cards, Expenses, Reimbursement, and Spending.

The Brex catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Brex’s developer surface includes authentication and 5 more developer resources.

🌐 Visit website 📡 Source on GitHub
28.4/100 thin ▬ flat Agent 30/100 agent aware Full breakdown ↓
scored 2026-08-20 · rubric v0.12.0
AccessFreemiumSelf serve⚡ Free to try
3 APIs
Bill PayCorporate CardsExpensesReimbursementSpending

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-20 · rubric v0.12.0
Composite quality — 28.4/100 · thin
Contract Quality 12.7 / 21
Developer Ergonomics 2.0 / 17
Access Clarity 2.7 / 17
Operational Transparency 1.2 / 11
Contract Governance 1.2 / 10
Discoverability 6.1 / 9
Regulatory Posture 2.8 / 15
Agent readiness — 30/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
Documented Reversibility 0 / 6
MCP Server 0 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 0 / 5
Well-Known Catalog 0 / 4
Consent & Bot Identity 0 / 3
A2A Agent Card 0 / 8
Dry-Run / Simulate Mode 0 / 4
Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.
The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/brex: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

Individual APIs this provider publishes, each with its own machine-readable definition.

Brex Budget Programs API

The Budget Programs API from Brex — 2 operation(s) for budget programs.

Brex Budgets API

The Budgets API from Brex — 6 operation(s) for budgets.

Brex Spend Limits API

The Spend Limits API from Brex — 3 operation(s) for spend limits.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Brex Budgets Budget Programs API

OPEN COLLECTION

Brex Budget Programs Budgets API

OPEN COLLECTION

Brex Budgets Budget Programs Spend Limits API

OPEN COLLECTION

Brex Budgets API

OPEN COLLECTION

GraphQL 1

GraphQL schemas published by this provider.

Brex GraphQL API

Brex is a financial stack for startups and enterprises covering corporate cards, business accounts, bill pay, and expense management. The API covers accounts, cards, transaction...

GRAPHQL

Pricing Plans 1

Published pricing tiers and plan structures.

Brex Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Brex Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Brex Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Brex Webhooks API

AsyncAPI 2.6 description of the Brex Webhooks surface. Brex uses webhooks to deliver real-time notifications when events happen in the accounts that you manage. Subscribers regi...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Brex API Rules

8 rules · 1 errors 7 warnings

SPECTRAL

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Brex Authentication

http · 1 scheme

SECURITY

Brex Domain Security

TLSv1.3 · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Brex Agentic Access

17 operations · 9 acting

17 operations · 9 acting

AGENTIC

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Company 1

The organization behind the API

LinkedIn
LinkedIn

Source (apis.yml)

apis.yml Raw ↑ 
aid: brex
url: https://raw.githubusercontent.com/api-search/brex/refs/heads/main/apis.yml
common:
- type: AgenticAccess
  url: agentic-access/brex-agentic-access.yml
- type: DomainSecurity
  url: security/brex-domain-security.yml
- type: Authentication
  url: authentication/brex-authentication.yml
- type: GitHubOrganization
  url: https://github.com/brexhq
- type: LinkedIn
  url: https://www.linkedin.com/company/brexhq
- type: LlmsText
  url: https://developer.brex.com/llms.txt
apis:
- aid: brex:brex-budget-programs-api
  name: Brex Budget Programs API
  description: The Budget Programs API from Brex — 2 operation(s) for budget programs.
  humanURL: ' https://developer.brex.com/openapi/budgets_api/'
  tags:
  - Budget Programs
  properties:
  - type: OpenAPI
    url: openapi/brex-budget-programs-api-openapi.yml
  - type: AsyncAPI
    url: asyncapi/brex-webhooks-asyncapi.yml
  - type: GraphQL
    url: graphql/brex-graphql.md
- aid: brex:brex-budgets-api
  name: Brex Budgets API
  description: The Budgets API from Brex — 6 operation(s) for budgets.
  humanURL: ' https://developer.brex.com/openapi/budgets_api/'
  tags:
  - Budgets
  properties:
  - type: OpenAPI
    url: openapi/brex-budgets-api-openapi.yml
  - type: AsyncAPI
    url: asyncapi/brex-webhooks-asyncapi.yml
  - type: GraphQL
    url: graphql/brex-graphql.md
- aid: brex:brex-spend-limits-api
  name: Brex Spend Limits API
  description: The Spend Limits API from Brex — 3 operation(s) for spend limits.
  humanURL: ' https://developer.brex.com/openapi/budgets_api/'
  tags:
  - Spend Limits
  properties:
  - type: OpenAPI
    url: openapi/brex-spend-limits-api-openapi.yml
  - type: AsyncAPI
    url: asyncapi/brex-webhooks-asyncapi.yml
  - type: GraphQL
    url: graphql/brex-graphql.md
name: Brex
tags:
- Bill Pay
- Corporate Cards
- Expenses
- Reimbursement
- Spending
tags_raw:
- Bill Pay
- Corporate Cards
- Expenses
- Reimbursements
- Spending
kind: contract
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-11'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/brex.png
access: 3rd-Party
created: '2024-11-12'
modified: '2026-05-30'
position: Consuming
description: Brex is the first fully unified spend platform with global corporate cards, expense management, reimbursements,
  travel, and bill pay. Brex makes it easy for finance teams to control all of their spend, all in one place. Using the Brex
  API, you can power your internal tools and create custom workflows.
maintainers:
- FN: Kin Lane
  email: info@apievangelist.com
specificationVersion: '0.23'