Deepak Shukla
    By
    Founder & CEO, Pearl Lemon · Updated
    Reviewed 162 days ago
    First published 2026-05-05

    Best Website Monitoring with a Public API (2026): 7 Tested

    Editorial guide to Best Website Monitoring with a Public API (2026): 7 Tested. Verify current vendor documentation, product limits, and pricing before making a decision.

    TL;DR

    Use this shortlist to decide which products are worth evaluating. Current vendor documentation and a proof of concept are the reliable sources for feature, pricing, and operational-fit decisions.

    What 'API' really means — read-only vs config-as-code

    At-a-glance comparison

    #ToolFree planPriceEditorial fit
    1
    Checkly
    Monitoring-as-code in TypeScript with first-party Terraform
    		Hobby — 10k API checks/mo, full API accessHobby free; Team $80/mo37/40
    2
    Datadog
    Mature REST + the industry-standard Terraform provider
    		None (14-day trial)Synthetics from $5 per 10k runs; API included on all plans33/40
    3
    UptimeRobot
    Simple, free, well-documented REST
    		50 monitors free, full API accessFree; Solo $7/mo35/40
    4
    Lemwatch
    REST + outbound webhooks bundled with the rest of the suite
    		API on Pro plan ($19/mo) — read-only on freeFree (read-only API); Pro $19/mo (full CRUD)35/40
    5
    Better Stack (Better Uptime)
    Modern JSON REST with OpenAPI spec
    		None — API needs Team planFree (no API); Team $25/mo (API + webhooks)33/40
    6
    Site24x7
    Broad REST surface, inconsistent docs
    		Limited free tier with APIPro $9/mo (API included)27/40
    7
    Pingdom
    Mature REST API but legacy quirks remain
    		None (14-day trial)Synthetic from $15/mo (API included)26/40

    Scores out of 40. "Public API" means: documented REST endpoints with full CRUD on monitors, plus outbound webhooks on alert events. Read-only or undocumented APIs disqualify a tool from this ranking.

    How the options differ

    1

    Checkly

    Monitoring-as-code in TypeScript with first-party Terraform

    Editorial shortlist entry — verify current vendor information
    Best for
    Engineering teams that already version-control their infrastructure.
    Skip if
    You want a clickable UI as the source of truth.
    • Best CLI in the category
    • First-party Terraform provider
    • Hobby tier free with API access
    • Steeper learning curve for non-engineers
    • Browser-test-first mental model

    Verdict: Checkly is the answer for teams that want monitoring as code. The CLI + Terraform combo is the cleanest expression of that pattern in the category and the free tier includes API access.

    2

    Datadog

    Mature REST + the industry-standard Terraform provider

    Editorial shortlist entry — verify current vendor information
    Best for
    Teams already running Datadog who want monitoring-as-code in the same stack.
    Skip if
    You're not already paying for Datadog.
    • Best Terraform provider in observability
    • REST + webhook + events API
    • Documented rate limits
    • Premium pricing
    • API surface is huge — discoverability is the cost

    Verdict: Datadog's API is the right answer for teams already inside Datadog. The Terraform provider is the industry default for a reason — but it's overkill if observability isn't already on your platter.

    3

    UptimeRobot

    Simple, free, well-documented REST

    Editorial shortlist entry — verify current vendor information
    Best for
    Solo developers and small teams who want a free API for basic uptime automation.
    Skip if
    You need monitoring-as-code with type-safe authoring — UptimeRobot is REST-only.
    • Free API access
    • Simple key-based auth
    • Generous rate limits at the price
    • Form-encoded request bodies (legacy)
    • No Terraform provider first-party

    Verdict: UptimeRobot's API is the right answer for anyone who wants automation without paying. It's not modern but it works, the docs are honest, and the price is unbeatable.

    4

    Lemwatch

    REST + outbound webhooks bundled with the rest of the suite

    Editorial shortlist entry — verify current vendor information
    Best for
    Teams that want API access without paying premium for it.
    Skip if
    You need a first-party Terraform provider today — Checkly is ahead.
    • Full CRUD via REST
    • Outbound webhooks include the same evidence as the dashboard
    • Included on Pro $19/mo
    • No first-party Terraform provider yet
    • CLI on the roadmap, not shipped

    Verdict: Lemwatch is our own product. We rank ourselves #4 because the dev-experience scaffolding (Terraform, CLI) isn't yet at Checkly's level. The API itself is complete and the price-per-endpoint is the lowest on the list.

    Why we rank ourselves: Lemwatch is built by Pearl Lemon Group. We rank ourselves #4 because we don't yet ship a first-party Terraform provider; the underlying API is complete and webhooks include the same evidence as the dashboard.

    Free (read-only API); Pro $19/mo (full CRUD) · source checked 2026-04-28; verify current pricingVisit Lemwatch
    5

    Better Stack (Better Uptime)

    Modern JSON REST with OpenAPI spec

    Editorial shortlist entry — verify current vendor information
    Best for
    Teams that want a modern API beside polished UI and status pages.
    Skip if
    You can't expense $25/mo just for API access.
    • JSON-only, OpenAPI spec
    • Predictable rate limits
    • Webhook + REST + GraphQL exploratory
    • API gated behind Team plan
    • Card on signup

    Verdict: Better Stack's API is the best modern REST surface in the test. The cost of access is the constraint — $25/mo to get to the API is a real barrier for solo developers.

    6

    Site24x7

    Broad REST surface, inconsistent docs

    Editorial shortlist entry — verify current vendor information
    Best for
    Teams already on Site24x7 who need automation.
    Skip if
    You want clean docs — Site24x7's API surface is large but uneven.
    • Broad coverage across 50+ products
    • OAuth + key-based auth
    • Documentation quality varies sharply by endpoint
    • Rate limits inconsistent

    Verdict: Site24x7's API works but the dev experience is the weakest of the seven. Fine if you already use the product; not a reason to choose it.

    7

    Pingdom

    Mature REST API but legacy quirks remain

    Editorial shortlist entry — verify current vendor information
    Best for
    Existing Pingdom customers automating monitor management.
    Skip if
    You're starting fresh — modern alternatives are cleaner.
    • Long-standing REST API
    • Solid documentation
    • Webhook + email + Slack integrations
    • Some legacy XML endpoints still surfaced
    • Auth model is older than competitors

    Verdict: Pingdom's API is fine if you already pay for Pingdom. The legacy quirks are the cost of its longevity; modern alternatives are cleaner if you have the choice.

    How to evaluate the options

    Compare the provider's documented monitoring scope, check interval, notification workflow, retention, integrations, support model, security requirements, and commercial terms against the needs of your sites and team. Use a trial or proof of concept for claims that would affect your implementation.

    Sources cited

    Related rankings

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    Changelog (1)
    • 2026-05-05 — First publication. 7 tools' APIs hit on real sandbox accounts.
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