Why Compliance APIs Need Versioning — And How We Do It

The Cost of a Breaking Change

When a payments API changes its response shape, a checkout page might break. Annoying, but fixable in hours. When a compliance API changes its response shape, a sanctions screening pipeline fails silently — and a shipment clears customs without proper due diligence.

The stakes are different in compliance. Every API consumer is running a regulated workflow where data integrity isn't optional. That's why we treat versioning as a first-class engineering concern, not an afterthought.

How Government Data Sources Change

Government agencies update their data formats constantly — often without warning:

• OFAC updates the SDN list format roughly quarterly, sometimes adding new fields mid-cycle
• SEC EDGAR changed their full-text search API in 2023 with 30 days notice
• FMCSA periodically restructures SAFER data fields
• FDA has migrated openFDA endpoints multiple times

If we passed these changes through to our API consumers directly, every upstream format change would cascade into hundreds of broken integrations. That's unacceptable.

Our Versioning Strategy

ComplianceGrid uses URL-path versioning with a strict compatibility contract:

POST /v1/compliance/restricted-party-screening
POST /v2/compliance/restricted-party-screening   ← future

The Rules

• Additive changes (new fields, new optional parameters) ship without a version bump
• Removal or rename of any field triggers a new major version
• Response shape changes trigger a new major version
• Deprecated versions receive security patches for 12 months
• 90-day notice before any deprecation takes effect

We normalize all upstream government data into our own canonical schemas. When OFAC changes their CSV format, we update our ingestion pipeline — your API response stays identical.

Practical Example

When the OFAC SDN list added secondary_sanctions_risk as a new field type in Q3 2025, here's what happened:

• Day 0: We detected the schema change in our automated ingestion tests
• Day 1: We added secondarySanctionsRisk as a new optional field in our v1 response
• Day 1: Changelog entry published, webhook notifications sent
• Impact to consumers: Zero. New field was additive. Existing integrations continued unchanged.

What This Means for You

When you integrate with ComplianceGrid, you're not integrating with raw government data — you're integrating with a stable, versioned abstraction layer. We absorb the instability so you don't have to.

If you're currently scraping government websites or polling bulk data exports, consider what happens when the format changes at 2 AM on a Friday. With ComplianceGrid, the answer is: nothing. Your integration keeps working.