--- title: "Website Monitoring API 2026: 7 Tools With Real Public APIs" description: "We hit the public APIs of 7 monitoring tools in May 2026. Best dev experience: Checkly. Best free tier: UptimeRobot. Best for Terraform: Datadog. Lemwatch…" canonical: "https://lemwatch.com/best/website-monitoring-with-api" source: "https://lemwatch.com" --- # Best Website Monitoring with a Public API (2026): 7 Tested > Best monitoring with a public API in May 2026: Checkly (monitoring-as-code via Playwright + Terraform). Datadog (mature REST + Terraform provider). UptimeRobot (free, simple, well-documented). Better Stack (tidy modern REST). Lemwatch ships REST + webhooks on… **Best dev experience: Checkly (config-as-code). Best Terraform: Datadog. Best free: UptimeRobot. Best modern REST: Better Stack. Best bundled: Lemwatch (Pro). Skip Pingdom Classic API (legacy XML) and StatusCake (rate-limited too tight).** ## The ranking - Checkly — Monitoring-as-code in TypeScript with first-party Terraform - Datadog — Mature REST + the industry-standard Terraform provider - UptimeRobot — Simple, free, well-documented REST - Lemwatch — REST + outbound webhooks bundled with the rest of the suite - Better Stack (Better Uptime) — Modern JSON REST with OpenAPI spec - Site24x7 — Broad REST surface, inconsistent docs - Pingdom — Mature REST API but legacy quirks remain ## We hit every API on this list — here's what actually works Most monitoring vendors claim an API. Half of them deliver something useful. We spent a day in May 2026 actually calling each tool's public API on a sandbox account: creating monitors, listing them, updating thresholds, deleting them, subscribing to incidents via webhook. The point of doing it on real accounts rather than reading docs was to find the gaps — undocumented rate limits, half-implemented endpoints, webhook payloads missing the field you'd actually want. Seven tools shipped a complete CRUD + webhook story. Several big-name vendors didn't. Checkly was the cleanest dev experience by a margin. Their CLI lets you author Playwright tests and API checks in TypeScript files committed alongside your application code, with a Terraform provider for the infra layer. Datadog's REST API is mature and the Terraform provider is industry-standard — if you're already on Datadog, monitoring-as-code is just one more module in your existing stack. UptimeRobot ships a simple, free, well-documented REST API that anyone can hit in 10 minutes; the rate limits are generous for the price. Better Stack's API is the most modern of the lot — JSON-only, OpenAPI spec published, predictable. Lemwatch ships a REST API and outbound webhooks on the Pro plan. We rank ourselves #4 because the dev experience isn't yet at Checkly's level — there's no first-party Terraform provider and the CLI is on the roadmap. The API itself is complete (full CRUD on sites, monitors, status pages and incidents) and the webhook payloads include the same evidence the dashboard surfaces. We disclose this honestly. The other three tools we tested (Pingdom Classic, StatusCake, Site24x7) all have APIs but each has a serious gap — Pingdom Classic uses XML, StatusCake's rate limits are too tight for real automation, Site24x7's docs are inconsistent across endpoints. ### What is the best website monitoring tool with a public API in 2026? In May 2026, Checkly is the best dev experience for monitoring-as-code — TypeScript authoring, first-party Terraform provider, free Hobby tier with API access. Datadog ships the industry-standard Terraform provider for teams already on its platform. UptimeRobot has a free, simple, well-documented REST API for solo developers. Lemwatch bundles full CRUD REST and outbound webhooks on the $19/mo Pro plan. Better Stack offers the cleanest modern JSON API but gates it behind the $25/mo Team plan. ### What is monitoring-as-code? Monitoring-as-code means defining your monitors, alerts and status pages in version-controlled config files — TypeScript, YAML or HCL — rather than clicking in a vendor UI. The benefit is the same as infrastructure-as-code: reviewable changes via pull request, deterministic re-creation of environments, and rollback. Checkly's CLI and Datadog's Terraform provider are the most mature implementations in May 2026. Most other vendors offer REST APIs that you can wire into your own scripts but lack the first-party tooling. ## Frequently asked questions ### Which monitoring tool has the best API? Checkly for monitoring-as-code in TypeScript with a first-party Terraform provider. Datadog for the industry-standard Terraform integration. UptimeRobot if you want a simple free REST API. Better Stack for a modern JSON-only API. ### Can I manage monitors with Terraform? Yes — Datadog and Checkly both ship first-party Terraform providers. Better Stack has a community provider. UptimeRobot, Lemwatch and Pingdom have community-built providers of varying quality. ### Do free monitoring tools have an API? UptimeRobot's free tier includes full API access. Lemwatch's free tier offers a read-only API; full CRUD ships on Pro ($19/mo). Better Stack and Datadog gate API access behind paid plans. ### What is monitoring-as-code? Defining monitors in version-controlled config (TypeScript, YAML or HCL) instead of clicking in a UI. Lets you review monitor changes in pull requests, roll back, and re-create environments deterministically. Checkly is the cleanest expression of the pattern today. ### Do these APIs include webhooks? All seven tools ship outbound webhooks on alert events. Webhook payload quality varies — Datadog and Checkly include trace context, Lemwatch includes the same evidence the dashboard shows, UptimeRobot's payload is minimal but complete. Scoring rubric and test environments: [our methodology](https://lemwatch.com/best/methodology). ## Related - [All best-of guides](https://lemwatch.com/best) - [Best website monitoring](https://lemwatch.com/best/website-monitoring) - [Best website monitoring with status page](https://lemwatch.com/best/website-monitoring-with-status-page) - [Best website monitoring with lighthouse](https://lemwatch.com/best/website-monitoring-with-lighthouse) - [How we test](https://lemwatch.com/best/methodology) - [Lemwatch pricing](https://lemwatch.com/pricing) - [All monitoring checks](https://lemwatch.com/features) - [Best Website Monitoring with No Credit Card (2026): 6 Verified](https://lemwatch.com/best/website-monitoring-no-credit-card)