TomGranot Audit API Usage Before the 2027 Version Cutoff
In March 2026 HubSpot replaced semantic API versioning (v1-v4) with date-based versions (/2026-03/-style paths, two releases a year, 18 months of support each). Everything still calling v1-v4 endpoints — including legacy OAuth v1 — becomes unsupported on March 30, 2027. This skill inventories what in your stack calls HubSpot and produces a migration checklist.
Why This Matters
The deadline fails quietly: unsupported APIs "no longer receive updates, bug fixes, or stability guarantees," and marketplace apps that don't migrate risk losing certification. A portal typically has more callers than anyone remembers — private apps, marketplace apps, middleware (Zapier/Make), form embeds, internal scripts, data warehouse syncs. Finding them takes an afternoon now or an incident later.
Key Facts
| Fact | Detail |
|---|---|
| Current recommended version | 2026-03 |
| Release cadence | March and September, every year |
| Support lifecycle | Current (6 months) → Supported (to 18 months) → Unsupported |
| v1–v4 end of support | March 30, 2027 |
| Also deprecated | Legacy v1 OAuth API (token issuance/introspection) |
Prerequisites
- Super Admin access (to view Integrations settings and private app logs)
- Optionally: a private app token (
HUBSPOT_ACCESS_TOKENin.env) for the account-level usage query - Access to the source code of any internal integrations
Execution Pattern
Stage 1: Plan
Confirm with the user: which systems are known to touch HubSpot (CRM syncs, website forms, analytics pipelines, internal scripts), and who owns each.
Stage 2: Before — Build the Caller Inventory
Work through each discovery source and record every caller in a checklist (owner, what it does, endpoints/versions used):
- Private apps: Settings > Integrations > Private Apps. Open each app > Logs — the API call log shows the exact request paths (
/crm/v3/...,/contacts/v1/...), which reveal the version in use. - Connected/marketplace apps: Settings > Integrations > Connected Apps. You can't see their internals; note each vendor — certified apps are being pushed to migrate by HubSpot, but confirm with the vendor for anything business-critical.
- Internal codebases: grep for version-revealing patterns:
grep -rEn "api\.hubapi\.com/[a-z-]+/v[0-9]|/contacts/v1|/email/public/v1|hubapi.com/automation/v[23]" . - Middleware (Zapier, Make, Workato, n8n): platform-managed connectors migrate on the vendor's schedule; custom HTTP steps inside them do not — check those by hand.
- Account-wide API usage (optional script check): the account-info API reports daily API usage totals for private apps:
This confirms how much traffic flows, not which versions — use the per-app logs from step 1 for version detail.resp = requests.get(f"{BASE}/account-info/v3/api-usage/daily", headers=HEADERS)
Stage 3: Execute — Classify and Plan Migrations
For every caller, classify:
| Status | Meaning | Action |
|---|---|---|
| Red | Calls v1/v2 legacy endpoints (e.g., /contacts/v1/, /email/public/v1/, forms v2) or legacy OAuth v1 |
Migrate now — many of these had earlier sunset dates already |
| Amber | Calls v3/v4 endpoints | Works until 2027-03-30; schedule migration to 2026-03 date-based paths |
| Green | Calls date-based paths, or vendor-managed and confirmed migrating | Monitor |
For amber/red internal code, the migration is usually mechanical — same resources, new path prefix and (sometimes) renamed fields; consult the endpoint's migration notes in HubSpot's docs. Batch the work per codebase, not per endpoint.
This repo's own scripts are amber by design: they target /crm/v3/ and /automation/v4/, supported until March 2027, with the migration path documented in CONTRIBUTING.md.
Stage 4: After
- Every caller in the inventory has a status and an owner.
- Red items have migration tickets with dates; amber items are scheduled before 2027-03.
- Re-run this audit every 6 months — each March/September release starts a new support clock.
Rollback
Read-only — nothing to roll back.
Technical Gotchas
- Private app logs are the ground truth. Code greps miss dynamically-built URLs; the per-app request logs in Settings show what is actually being called.
- 404 vs 403 vs unsupported. After end of support, endpoints may keep working for a while — "unsupported" means no fixes or guarantees, not an instant shutoff. Do not treat "it still works" as "we're fine."
- OAuth is part of this. Apps using legacy v1 OAuth token endpoints must move to the date-based OAuth API even if their data endpoints are current.
- SDK versions pin API versions. If an integration uses an official HubSpot SDK, the SDK's major version determines which API version it calls — check the SDK changelog, not just your code.