Mercury Bank vs Relay: Which Is Better for Non-Resident LLC Founders?

If you're a non-resident founder with a US LLC, choosing the right business bank account is one of the most important decisions you'll make early on. Two fintech banks dominate the conversation: Mercury and Relay. Both accept non-resident founders, both are free to open, and both offer modern banking experiences that traditional banks can't match.

But they're not identical. Mercury and Relay have different strengths, different fee structures, and different approaches to banking. This guide breaks down everything you need to know to make the right choice for your specific situation — whether you're a solo freelancer, SaaS founder, or running a small agency.

If you're still deciding which US bank to use, you may also want to read our broader overview of the best banks for non-resident US LLC owners.

Mercury vs Relay: Quick Overview

Before we dive into the details, here's a high-level snapshot of what each platform offers:

Mercury is a fintech banking platform designed for startups and tech companies. It's backed by Choice Financial Group and Evolve Bank & Trust (both FDIC-insured). Mercury is known for its clean interface, robust API, and strong international wire support. It's the default choice for most YC-backed startups and has become the go-to bank for non-resident LLC founders.

Relay is a fintech banking platform focused on small business financial management. It partners with Thread Bank (FDIC-insured) and emphasizes budgeting, profit-first accounting, and team expense management. Relay stands out for its unlimited debit cards and sub-account structure that helps founders organize cash flow.

Detailed Feature Comparison

Account Opening Process for Non-Residents

Both Mercury and Relay have streamlined their application processes for non-resident LLC founders. Here's what to expect from each:

Opening a Mercury Account

Mercury's application is entirely online and typically takes 1-3 business days for approval. You'll need:

• EIN confirmation letter (CP 575 or 147C from the IRS)
• Articles of Organization (your LLC formation document)
• Operating Agreement (single-member or multi-member)
• Valid passport for identity verification
• Proof of address in your home country (utility bill or bank statement)

Mercury's verification process is largely automated. Most non-resident founders report receiving approval within 24-48 hours. If additional documentation is requested, expect an extra 2-3 business days. Mercury does not require a US phone number or US address — your registered agent address on your LLC documents is sufficient.

Opening a Relay Account

Relay's application is also fully online but can take slightly longer — typically 2-5 business days. You'll need the same core documents:

• EIN confirmation letter
• Articles of Organization
• Operating Agreement
• Valid passport
• Proof of address in your home country

Relay's onboarding includes a few extra questions about your expected transaction volume and business type. Some non-resident founders report a manual review step that adds 1-2 days to the process. Overall, both applications are straightforward — just have your documents ready before you start.

For a complete walkthrough of opening a US bank account as a non-resident, see our guide on how non-US founders open US business bank accounts.

International Wire Transfers and Multi-Currency Support

This is where the two platforms diverge significantly, and for most non-resident founders, it's the deciding factor.

Mercury's International Wire Support

Mercury supports outbound SWIFT transfers to most countries worldwide. Fees range from $15-$20 depending on the destination, which is significantly cheaper than traditional banks (which charge $25-$50+ per wire). Mercury also supports incoming international wires at no cost to you — the sender's bank may charge a fee, but Mercury doesn't add anything on top.

Mercury recently introduced multi-currency features that allow you to hold and send funds in major currencies like EUR, GBP, and CAD. This is particularly valuable if you're paying international contractors or transferring money to your personal accounts overseas.

Relay's International Wire Support

Relay supports international wires but at higher fees — typically $30+ per outbound wire. Relay's international wire process is also slightly more manual, requiring you to submit wire details through their interface rather than an API. For founders who only send occasional international wires, this isn't a major issue. But if you regularly transfer funds overseas, the fee difference adds up quickly.

Many founders who choose Relay for domestic banking use Wise Business alongside it for international transfers, combining Relay's expense management with Wise's superior exchange rates.

API and Integrations

If you're building automated workflows around your finances, Mercury's API is significantly more capable than Relay's.

Mercury offers a full REST API that lets you programmatically create transactions, pull account data, manage recipients, and automate payment flows. This makes Mercury the preferred choice for SaaS founders who want to connect their banking to tools like Stripe, accounting software, and invoicing platforms.

Relay relies primarily on Plaid for third-party integrations. While this covers most accounting software connections (QuickBooks, Xero, FreshBooks), it doesn't offer the same level of programmatic control. If you're a developer who wants to build custom financial automations, Mercury is the clear winner here.

Customer Support Comparison

Customer support quality matters more than most founders realize — especially when you're a non-resident dealing with banking issues across time zones.

Mercury offers email and in-app chat support. Response times are generally fast (under 2 hours during business hours, same-day for off-hours). Mercury's support team is known for being knowledgeable about non-resident founder needs, which is a significant advantage. For premium tier users, Mercury offers dedicated account managers.

Relay offers email and phone support during US business hours. Phone support is a differentiator — Mercury doesn't offer phone support on the free tier. However, Relay's support team has less experience with non-resident use cases, and some founders report longer resolution times for international banking questions.

Which Should You Choose?

Here's our recommendation based on founder type:

Choose Mercury If:

• You're a solo founder or small team focused on international clients
• You send regular international wire transfers
• You want a robust API for automating financial workflows
• You use Stripe heavily and want deep integration
• You want to earn interest on idle cash via Mercury Treasury
• You need extended FDIC insurance coverage (up to $5M)

Choose Relay If:

• You have a team and need multiple debit cards with spending controls
• You follow profit-first or envelope budgeting methodology
• You need a physical debit card shipped internationally
• You prefer phone support during US business hours
• You want unlimited sub-accounts for organizing cash flow

Use Both If:

• You want Mercury as your primary operating account and Relay for team expenses
• You want to separate revenue accounts (Mercury) from expense accounts (Relay)
• You want redundancy — having two bank accounts protects you if one has issues

For most non-resident solo founders, Mercury is the better default choice. Its international wire support, API capabilities, and Stripe integration make it the more practical option for running an international business through a US LLC. Relay is an excellent complement, especially if your team grows and you need more granular spending controls.

Whichever you choose, make sure your invoicing workflow is connected. Proper invoicing software that syncs with your bank account saves hours of manual reconciliation every month.

Security, Fraud Protection, and Account Recovery

Security is a critical consideration when your bank account is the financial backbone of your entire business — especially when you're managing it from another country.

Mercury provides two-factor authentication (2FA) via authenticator apps and SMS, device-based session management, and role-based access controls for team members. Mercury also offers real-time transaction alerts and the ability to instantly freeze your debit card from the dashboard. If suspicious activity is detected, Mercury's fraud team proactively reaches out — several founders have reported Mercury catching unauthorized ACH debits before they cleared. For account recovery, Mercury's support team can verify your identity remotely using your passport and LLC documents, which is essential when you don't have a US phone number or address.

Relay also supports 2FA and offers per-card spending limits, which act as a natural fraud prevention layer. If a team member's card is compromised, the damage is limited to that card's spending cap. Relay lets you create single-use virtual cards for one-time purchases — particularly useful for software subscriptions or vendor payments where you don't want to expose your primary card. Account recovery at Relay follows a similar remote verification process, though some founders report it takes slightly longer than Mercury's process.

Both platforms use bank-level encryption (AES-256) and are SOC 2 Type II compliant. For non-resident founders concerned about account security while operating remotely, both banks meet a high standard — but Mercury's proactive fraud detection gives it a slight edge in practice.

Final Thoughts

Both Mercury and Relay are excellent fintech banking options for non-resident LLC founders. The "right" choice depends on your specific needs — international wire frequency, team size, integration requirements, and banking style. The good news is that opening an account at either (or both) is free and takes just a few days. Start with the one that matches your primary use case, and add the other later if needed.

For more context on the full range of banking options available to non-resident founders, check out our comprehensive guide to the best banks for non-resident US LLC owners.