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OnCrawl

OnCrawl API

Yes. OnCrawl publishes a public REST API. See developer.oncrawl.com for pricing details.

MCP also availableLLMs: ChatGPT
Open API docsTry OnCrawl
Public REST API documentedAgent-readiness 5/10
Data from Buddy's database, auto-rechecked weekly

What is the OnCrawl API?

The OnCrawl 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.

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 specifically, the community MCP server is usually less code than the REST API. The API still wins for scheduled jobs, dashboards, and anything outside an LLM-driven flow.

For the broader picture: full coverage on this tool.

HOOK IT TO YOUR STACK

Real OnCrawl API calls you'll write

oncrawl-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.
oncrawl-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.
oncrawl-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 OnCrawlAgent fit: 5/10

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

How much does the OnCrawl API actually cost?

Verify on docs

OnCrawl 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
—
Webhooks
—
Structured outputs
—

OnCrawl also has an MCP server

If you're wiring OnCrawl into Claude / Cursor / Codex, the MCP server is usually less code than the REST API.

See OnCrawl MCP page

What you can build with the OnCrawl API

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

SOLO DEV / FOUNDER

Glue OnCrawl 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 OnCrawl reporting at scale

  • White-label OnCrawl data into client-branded dashboards
  • Run scheduled multi-account reports without logging into the OnCrawl 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 OnCrawl

  • Real-time sync into your warehouse on a cron
  • Custom alerts the dashboard's built-in alerting can't express
  • Backfill + idempotency handling for OnCrawl 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 OnCrawl API docs: https://developer.oncrawl.com

curl -X GET "https://developer.oncrawl.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 developer.oncrawl.com.

Limits and gotchas

  • No OpenAPI spec — you write typed clients by hand or use a third-party generator on the docs HTML.
  • 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.
5/10

Agent-readiness verdict

Moderate agent-fit with community support. OnCrawl has a public API with documentation and a community MCP server, plus native ChatGPT integration, but lacks official MCP hosting, OpenAPI specs, and Claude support. The missing structured outputs and webhooks limit automation depth for complex agent workflows.

MCP server availablePublic API with docsNative ChatGPT integration

OnCrawl API FAQ

Does OnCrawl have a public API?+
Yes — REST API at developer.oncrawl.com.
Should I use the API or the MCP server for Claude / Cursor / Codex?+
Prefer the MCP server for agent workflows — it's less code and pre-handles auth flows. Use the REST API for scheduled jobs, dashboards, and anything outside an LLM-driven flow.

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.

About meHow I review

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