Developers can now originate physical and digital check payments through Modern Treasury's unified Payments API alongside ACH, wire, RTP, FedNow, push-to-card, and stablecoin payments.

Modern Treasury today announced that its Payment Service Provider (PSP) now supports payments via physical and digital checks. Rather than integrating a separate check printing vendor or maintaining distinct reconciliation workflows, developers can use a single API to route payments across ACH, wires, RTP, FedNow, push-to-card, stablecoins, physical checks, and digital checks. The result is less operational complexity, faster implementation, and consistent payment tracking across every rail.

Payment Rails Don’t Die

Modern Treasury's PSP was built on the premise that no single rail can serve every use case. A vendor payment might move fastest over RTP, a payroll disbursement might run on ACH, and a cross-border settlement might move over stablecoins. Checks are no exception. According to the Federal Reserve’s latest data, 9.2 billion checks are used annually, representing $24.45 trillion in volume.

Checks remain structurally required across the industries that move the most money — insurance claims and settlements (where checks still account for roughly 55% of disbursements), legal and escrow payments, construction progress billings, real estate disbursements, healthcare reimbursements, enterprise accounts payable, and unclaimed property administration, where state law mandates checks for remittances. Until now, those teams building on modern payment infrastructure have had to bolt on a separate vendor or legacy process just to cover this one rail.

What this means for developers

With Modern Treasury’s PSP, customers can now:

• Choose the appropriate payment rail based on recipient preference, speed, cost, or business rules without changing integrations
• Generate and mail physical checks directly to a recipient's address
• Send a digital check that recipients can deposit via mobile banking or remote capture, without waiting on the mail
• Protect every check with automatic stop payments and Positive Pay - no separate fraud workflow required
• Add custom logos and attachment pages to both physical and digital checks, preserving brand identity across the full disbursement experience
• Manage payments within the same dashboard, ledger, and compliance controls used for all other payment types
• Create financial experiences based on recipient preference, cost, or speed, without maintaining separate systems per method

This means developers no longer need a second vendor, a separate API, or a manual workaround to support recipients who need a check. Checks become another payment rail that can be selected alongside ACH, RTP, FedNow, push-to-card, wire transfers, and stablecoins using the same API, orchestration layer, ledger, and reconciliation workflows that Modern Treasury has used to move over $600B in payments.

"We have a saying at Modern Treasury: payment rails don't die. There's no better example than checks. No matter how the industry evolves, platforms still need the flexibility to let their customers pay and get paid in the ways that work best for them," said Matt Marcus, Co-Founder and CEO of Modern Treasury. "Instant payment rails like RTP, FedNow, push-to-card, and stablecoins are expanding what's possible, but checks remain essential for millions of recipients. Our job is to ensure customers never have to choose between adopting the newest payment technologies and supporting the rails their business still relies on."

Check support is available now to Modern Treasury PSP customers. Learn more at moderntreasury.com/products/payments.

About Modern Treasury

Modern Treasury provides the most trusted infrastructure for global money movement. Trusted by leading enterprises and financial institutions, the platform helps businesses launch and scale payment experiences in days, not months, with best-in-class developer tools and a single API for both fiat and stablecoin transactions. With built-in compliance, ledgering, and reporting, Modern Treasury enables instant, reliable, and scalable money movement for companies of all sizes.

Backed by leading investors including Benchmark, Altimeter, and Salesforce Ventures, Modern Treasury has powered over $600 billion in payments for hundreds of organizations.

Learn more about Modern Treasury at www.moderntreasury.com.

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"We have a saying at Modern Treasury: payment rails don't die. There's no better example than checks," said Matt Marcus, Co-Founder and CEO of Modern Treasury.