--- title: #api description: 9 articles about api — guides and explainers from the WatchFor team. canonical: https://watchfor.io/blog/tag/api --- [All posts](/blog) # #api Articles tagged "api". [All](/blog)[Monitoring](/blog/category/monitoring)[Networking](/blog/category/networking)[Performance](/blog/category/performance)[Security](/blog/category/security)[Reliability](/blog/category/reliability)[Email](/blog/category/email)[DevOps](/blog/category/devops)[Engineering](/blog/category/engineering) [All articles](/blog/all) 9 article s [MonitoringSep 11, 2026 ## The best API monitoring tools in 2026 An API that returns 200 with the wrong body passes every uptime check ever written. The tools worth paying for are the ones that assert on what came back — and they split cleanly into two camps depending on whether you want checks in a repository or not.WatchFor Team4 min read](/blog/best-api-monitoring-tools)[MonitoringAug 23, 2026 ## Seven API monitors every SaaS should be running (with the exact assertions) Not a philosophy post — a checklist. Seven concrete API monitors, the exact assertion each one needs, and the failure it catches: the lying health endpoint, the silently expiring token, the queue that backs up on Friday night, and four more.WatchFor Team5 min read](/blog/seven-api-monitors-every-saas-needs)[MonitoringAug 23, 2026 ## Webhook reliability: designing deliveries that survive, and monitoring both ends Webhooks fail silently by design — the sender moves on, the receiver never knows what it missed. Here's the engineering playbook for both sides: retries and idempotency, signatures and ordering, dead letters — and the monitoring that catches a dead webhook pipeline before your data drifts.WatchFor Team4 min read](/blog/webhook-reliability-guide)[MonitoringAug 09, 2026 ## API monitoring beyond status codes: assert on the response, chart what matters A 200 OK only proves your API answered — not that the answer was right. Here's why status-only checks miss real outages, what monitoring the response actually takes, and how WatchFor's new API monitor asserts on JSON, extracts values into charts, and pages you when the body goes wrong.WatchFor Team6 min read](/blog/api-monitoring-beyond-status-codes)[MonitoringJun 03, 2026 ## API Monitoring Guide: how to watch the endpoints your business runs on Your website can be perfectly up while your API quietly fails — and APIs power the integrations, apps and partners you can't see. Here's how to monitor them properly.WatchFor Team4 min read](/blog/api-monitoring-guide)[MonitoringApr 18, 2026 ## Webhooks 101: what they are and how to use them A webhook is how one app says 'hey, this just happened' to another — instantly, without anyone asking. Here's what webhooks are, how they differ from polling, and how to use them well.WatchFor Team3 min read](/blog/webhooks-101)[MonitoringApr 01, 2026 ## Rate Limiting & HTTP 429 Explained Rate limiting is how services protect themselves from too many requests — and HTTP 429 is how they say 'slow down'. Here's how it works, and how to handle it gracefully on both sides.WatchFor Team3 min read](/blog/rate-limiting-explained)[NetworkingMar 08, 2026 ## 401 vs 403: Unauthorized vs Forbidden 401 and 403 are the two 'you can't have this' codes — and they're constantly confused. Here's the simple rule for telling them apart, with examples.WatchFor Team3 min read](/blog/401-vs-403)[MonitoringMar 02, 2026 ## CORS Errors Explained (and how to fix them) Every web developer meets the dreaded 'blocked by CORS policy' error. It's not a bug — it's a security feature. Here's what CORS is, why the browser blocks your request, and how to fix it properly.WatchFor Team3 min read](/blog/cors-errors-explained) --- Canonical page: https://watchfor.io/blog/tag/api · Site guide: https://watchfor.io/llms.txt