Get it Right. Every Time.

Validate, standardize, and verify U.S. mailing addresses in real-time before they cost you lost deliveries, failed compliance, or customer trust.

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Why Address Accuracy Matters

Did You Know?

Over 23% of returned mail is caused by invalid or incomplete addresses. Whether you’re sending policies, statements, or regulatory notices, address errors create delays, compliance issues, and customer dissatisfaction.

RelayDocs Address Assurance API eliminates bad data before it enters your systems.

Real-time USPS address validation
CASS-certified accuracy
Apartment/suite detection (DPV)
Residential vs Commercial flag (RDI)
National Change of Address (NCOA) lookups

What You Get with RelayDocs Address Assurance

RelayDocs Address Assurance API is designed for enterprise-grade accuracy with developer-friendly tools and infrastructure that just works.

Smart Autocomplete

Guide users at point-of-entry with intelligent, ZIP-aware address predictions

USPS Certified CASS + DPV

Ensure mail deliverability with USPS standards

Real-Time API

Validate address entries instantly via REST API

Residential & Commercial Detection (RDI)

Optimize shipping and compliance decisions

Bulk Upload Support

Upload CSVs with thousands of addresses for validation

Use Cases

Address Accuracy for Every Workflow

One API. Multiple teams. Enterprise-wide impact.

Transactional Communications

Ensure accurate delivery of bills, account statements, and customer letters.

Industries: Banks, Credit Unions, Utilities, Insurance, eCommerce

Compliance Mailings

Meet regulatory obligations by validating recipient details before dispatch.

Industries: Healthcare, Government, Financial Services, Legal

CRM & Marketing Hygiene

Enrich or clean existing address databases and reduce email-bounce or mail-return rates.

Industries: SaaS, Marketing Agencies, Direct Mail

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Start Verifying Addresses in Minutes

Plug and play with our secure, scalable Address Assurance API. Upload your lists or integrate in real-time - RelayDocs makes it easy.

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Compliant Communications for Every Sector

From regulated industries like finance and healthcare to public sector entities and insurance providers, RelayDocs delivers secure, traceable, and cost-effective document automation that meets your compliance and operational needs.

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