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GrowthBar

GrowthBar API

Yes. GrowthBar publishes a public REST API. See seoptimer.com/growthbar for pricing details.

OpenAPI spec
Open API docsTry GrowthBar
Public REST API documentedAgent-readiness 4/10
Data from Buddy's database, auto-rechecked weekly

What is the GrowthBar API?

The GrowthBar API is a public REST interface to keyword data, backlink profiles, SERP positions, and site-audit results. Auth method is documented on the official API reference. No official SDK was detected, so most teams hit it directly with HTTP clients. An OpenAPI spec is published, which means you can auto-generate typed clients from it.

Typical builds: scheduled rank trackers that alert on position drops, competitor monitoring dashboards, and automated site-audit reports piped into Slack or a BI tool.

For agent workflows, the API is the path of least resistance until GrowthBar ships an MCP server. ask Claude to summarise this week's ranking shifts, have Cursor draft on-page fixes from a fresh site audit, and let Codex compare your backlink profile to a named competitor.

For the broader picture: full coverage on this tool.

HOOK IT TO YOUR STACK

Real GrowthBar API calls you'll write

growthbar-apirest
#Get the top organic keywords for a domain
GET/v3/site-explorer/organic-keywords?target=mysite.com&limit=10
200 OK · 10 results
marketing automationpos 4 · vol 12.4k
email marketing softwarepos 6 · vol 8.9k
seo tools 2026pos 8 · vol 6.3k
best crm small businesspos 12 · vol 4.6k
Cron daily to track ranking shifts.
growthbar-apirest
#Pull a competitor's backlink profile
GET/v3/site-explorer/backlinks?target=rival.com&limit=100
200 OK · 100 backlinks
Referring domains1,847
Domain Rating78
New backlinks (30d)+142
Lost backlinks (30d)-38
Pipe into a weekly Slack report.
growthbar-apirest
#Trigger a fresh site audit
POST/v3/site-audit/scan
202 Accepted · scan_id: 7f2a
Statusqueued
Estimated finish~4 min
Webhook callbackconfigured
Last scan issues47 (12 critical)
TMB SCORE FOR GrowthBarAgent fit: 4/10

Endpoints illustrative. Confirm exact paths against the live API docs before integrating.

How much does the GrowthBar API actually cost?

Verify on docs

GrowthBar publishes an API, but per-tier gating wasn't extracted automatically.

  • Most likely scenario: API access is either included in all paid plans, or it's gated to higher tiers and we need to verify on the live docs page.
  • Until verified, treat the question "which plan unlocks the API" as open. Don't budget on the assumption it's free with the cheapest paid plan.

API at a glance

Auth method
—
SDK languages
—
OpenAPI spec
yes
Webhooks
—
Structured outputs
—

What you can build with the GrowthBar API

Three personas, three different shapes of build. Pick the row that matches how you actually ship.

SOLO DEV / FOUNDER

Glue GrowthBar into your daily workflow

  • Pull a digest of ranking changes into your morning Slack
  • Trigger a one-off backfill when something looks off
  • Pipe data into your own SQLite for ad-hoc queries
Effort: A weekend, one Node or Python script
AGENCY / CONSULTANT

Sell GrowthBar reporting at scale

  • White-label GrowthBar data into client-branded dashboards
  • Run scheduled multi-account reports without logging into the GrowthBar UI
  • Cross-reference with the rest of the client's stack (CRM, analytics, ad spend)
Effort: 1-2 weeks, hits multi-tenant auth quickly
IN-HOUSE ENGINEER

Production pipelines for GrowthBar

  • Real-time sync into your warehouse on a cron
  • Custom alerts the dashboard's built-in alerting can't express
  • Backfill + idempotency handling for GrowthBar data older than the dashboard exposes
Effort: Multi-week project, expect rate-limit tuning

Quickstart template

# Starter template — endpoint paths and SDK package names come from
# the GrowthBar API docs: https://www.seoptimer.com/growthbar/

curl -X GET "https://www.seoptimer.com/<your-endpoint>" \
  -H "Authorization: Bearer $TOKEN" \
  -H "Accept: application/json" | jq .

Template only. Endpoint paths, exact base URL, and auth header format come from seoptimer.com/growthbar.

Limits and gotchas

  • OpenAPI is published — auto-generated clients work out of the box. Saves writing wrappers by hand.
  • No official SDK detected. Plan on hitting the API directly with your HTTP client of choice.
  • Rate limits: always read the docs page before scaling — the published limit is usually lower than the practical one and overages can be expensive.
4/10

Agent-readiness verdict

Poor agent fit without MCP. GrowthBar publishes an OpenAPI spec and public API docs, but lacks an MCP server, webhooks, and structured outputs that agent workflows need. Consider alternatives if Claude or Cursor automation is your primary use case.

Public API with docsOpenAPI/Swagger spec published

GrowthBar API FAQ

Does GrowthBar have a public API?+
Yes — REST API at seoptimer.com/growthbar.
Is there an OpenAPI / Swagger spec I can auto-generate clients from?+
Yes — at growthbarseo.com/openapi.json.

Sources

Joonas Rotko
Joonas RotkoAuthor & Founder of That Marketing Buddy

10+ years in digital marketing. I review marketing software for AI-stack fit: real pricing, MCP and API support, and how cleanly each tool drops into an AI agent workflow, cross-checked against verified data and real user feedback.

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