Website and API monitoring that reads the response
Check a website or API as often as every minute, and treat a wrong status code, missing text or a bad JSON field as down, even when the server answers.
Why it works this way
A check that only asks whether the server answered misses the failures customers actually hit. An API can return 200 with an error inside it, and a page can load with an error banner where the content should be.
Each website monitor sends the request you describe: the method, headers, query parameters and body you choose, with basic auth if the endpoint needs it. The response then has to pass your rules, such as a status code in the range you expect, text that must or must not appear, and a JSON field that must exist or hold a given value.
A monitor is marked down after two failed checks in a row, so one dropped packet does not publish an outage, and your team is told the moment it flips. Certificates on https:// addresses are watched as well, and you are warned before one expires.
What it costs
Those capabilities and everything they depend on come to $5/mo.
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Build the plan around it.
Add what you need, drop what you do not, and read the total before you buy.