Our Verdict
Based on ratings, features, pricing, and capabilities, Mercury edges ahead in this comparison. Mercury scores higher on user ratings and overall feature set.
Feature
Mercury
Brex
Rating
⭐ 4.8/5
⭐ 4.7/5
Free Plan
Starting Price
Free
$12/mo
Monthly Visits
6.2M
5.4M
API Support
Open Source
AI Capabilities
Mobile App
Desktop App
Browser Extension
Integrations
6 apps
6 apps
Team Size
STARTUP
ENTERPRISE
Mercury Pros & Cons
Pros
- Zero monthly fees and free wire transfers
- High-yield automated treasury accounts for idle cash
- Clean modern developer API and dashboard UI
Cons
- Strict underwriting criteria (designed primarily for US-registered tech startups)
- Not designed for cash-heavy retail brick-and-mortar
Brex Pros & Cons
Pros
- High dynamic credit limits tied to cash balances
- Seamless expense categorization and automated policy compliance
- Generous startup rewards and software discounts
Cons
- Shifted focus away from traditional small SMBs toward venture-backed/enterprise
- Global currency accounts require enterprise tier
Mercury Key Features
- Up to $5M FDIC Insurance (Vault)
- Mercury Treasury (T-Bills & Money Market)
- Free Domestic & International Wires
- Corporate Credit Cards
- Read/Write API
Brex Key Features
- Corporate Cards (No Personal Guarantee)
- Global Spend Management
- Integrated Travel Booking
- Automated Expense Policies
- Brex AI Receipt Capture