Checks whether a website or web address is currently reachable and reports how f
Checks whether a website or web address is currently reachable and reports how fast it responded.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
844 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://url-uptime-checker.underscoredone.com/check
| Category | Everything else |
|---|---|
| Provider host | url-uptime-checker.underscoredone.com |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.01 | 844 ms |
Example input (from the provider)
{
"body": {
"follow_redirects": true,
"method": "GET",
"url": "https://example.com"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"follow_redirects": {
"description": "Whether to follow redirects to their final destination before reporting the result. Defaults to true.",
"type": "boolean"
},
"method": {
"description": "Which kind of request to send: 'GET' to fetch the page or 'HEAD' to just check reachability faster. Defaults to 'GET'.",
"type": "string"
},
"url": {
"description": "The full web address to check, including http:// or https:// at the start.",
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"api_version": {
"type": "string"
},
"checked_at": {
"type": "string"
},
"error": {
"type": "string"
},
"final_url": {
"type": "string"
},
"redirected": {
"type": "boolean"
},
"response_time_ms": {
"type": "integer"
},
"status_code": {
"type": "integer"
},
"up": {
"type": "boolean"
},
"url": {
"type": "string"
}
},
"required": [
"api_version",
"url",
"up",
"status_code",
"response_time_ms",
"final_url",
"redirected",
"error",
"checked_at"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}