“API monitoring” can mean a simple health endpoint, JSON assertions, a chained authentication flow, or a failed test linked to backend traces. The best API monitoring tool depends on that depth. Search evidence for this page also asks about uptime, performance, security, synthetic checks, and dashboards; no single check type answers all of those.
Official product and pricing pages were checked on August 10, 2026.
Shortlist
| Need | Tool | Main tradeoff |
|---|---|---|
| Simple API uptime + status communication | Webalert or UptimeRobot | No deep multistep workflow engine |
| Playwright and monitoring as code | Checkly | Execution limits and overages |
| Existing collection workflow | Postman Monitors | Monitoring calls share monthly quotas |
| APM and log correlation | Datadog or New Relic | Platform complexity and usage pricing |
| Broad protocol and synthetic coverage | Dotcom-Monitor | More product than a simple health check needs |
Checkly: best for code-first synthetic API monitoring
Checkly Synthetic Monitoring supports API checks every 10 seconds, multistep checks, Playwright browser tests, CLI, API, and CI execution from 22+ locations. Pricing meters API and browser runs; Hobby is capped and stops running after allocations are used. Choose it when tests belong in Git and developers maintain them.
Postman Monitors: best for teams already using collections
Postman pricing lists 1,000 monitoring requests per month on Free and 10,000 on paid plans. Billing documentation lists paid overages at $0.75 per 1,000 calls or prepaid 50,000-call blocks at $20. Choose Postman when existing collections, environments, and tests can become monitors without a second authoring system.
Datadog: best for correlation with an existing observability platform
Datadog charges Synthetic API tests at $5 per 10,000 runs on annual billing and supports API, multistep, browser, mobile, and private-location tests. Its advantage is the path into APM traces and logs. Standing up Datadog only for an endpoint ping rarely makes sense.
New Relic: best when synthetic allowances are already included
New Relic’s usage limits include 500 non-ping checks on Free, 10,000 on Standard, 1 million on Pro, and 10 million on Enterprise monthly. Additional non-ping checks are documented at $0.005. Choose it when New Relic already owns the application telemetry.
Dotcom-Monitor: best for broad API and protocol testing
Dotcom-Monitor API monitoring covers REST, SOAP, GraphQL, multistep transactions, private agents, and global locations. Its pricing includes a free target tier and paid subscriptions from $19.99/month. It suits teams that need more than HTTP but do not want a full APM platform.
Webalert and UptimeRobot: best for simple API availability
Webalert monitors HTTP/HTTPS endpoints with headers and content checks, plus TCP, DNS, ping, heartbeat, status pages, and incident alerting. See features and pricing. UptimeRobot pricing offers a much larger free monitor count. Both fit “is the endpoint reachable and returning the expected response?”; neither replaces chained API workflows or trace correlation.
Do not confuse monitoring with API security
Availability and response assertions do not prove authorization, schema safety, rate-limit resilience, or vulnerability coverage. Use API security testing and gateway telemetry for those concerns. Monitoring should verify critical behavior without placing production secrets in an unsafe runner.
Evaluation plan
- Classify each endpoint as ping, assertion, multistep, or browser-backed.
- Calculate monthly runs: checks × locations × executions per month.
- Verify secret storage, private-location requirements, and redaction.
- Fail a test intentionally and inspect evidence, alert routing, and dashboard history.
- Keep a simple independent health check even if deep tests live in an APM platform.
Depth × cost table (August 2026)
| Depth | Tool | How you pay | Independent ping? |
|---|---|---|---|
| Reachable + status/keyword | Webalert / UptimeRobot | Per monitor | This is the ping |
| Collection replay | Postman Monitors | Monthly call quota / $0.75 per 1k overage | Add one |
| Git + Playwright + API | Checkly | Per run; Hobby can stop | Add one |
| API + APM correlation | Datadog / New Relic | Runs or included checks | Add one |
| SOAP/GraphQL/private agent | Dotcom-Monitor | Subscription + targets | Add one |
Frequently asked questions
What is the best API monitoring tool if I only have /health?
A simple HTTP monitor with an expected status and optional body assertion. See uptime monitoring and the UptimeRobot alternative if you need dozens of those.
Is API monitoring the same as API security?
No. Availability checks do not prove authz or schema safety.
Bottom line
Choose Checkly for code-first workflows, Postman for collection-native monitoring, Datadog or New Relic for platform correlation, Dotcom-Monitor for broad synthetic protocols, and Webalert or UptimeRobot for simple API uptime. The cheapest reliable architecture is often a simple check on every endpoint plus deep synthetic tests on only the business-critical flows.