Livecheck Sentinel check
Livecheck Sentinel check - one-shot URL condition check. POST /v1/check with {target, condition, baseline_hash?}. Detectors: status_change, keyword, text_diff, numeric_threshold. Returns current observation + fired when comparable. Fixed $0.02 USDC. No watcher created. Not /v1/verify ($0.01) and not Confirm.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
319 msmedian answer time
$0.02listed price per call
$0.02price 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://livecheck.fly.dev/v1/check
| Category | Everything else |
|---|---|
| Provider host | livecheck.fly.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.02 | 319 ms |
Example input (from the provider)
{
"body": {
"baseline_hash": null,
"condition": {
"detector": "status_change",
"params": {}
},
"target": {
"render": "never",
"selector": null,
"type": "url",
"url": "https://boards.greenhouse.io/example/jobs/1842"
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"baseline_hash": {
"description": "Prior observation.hash for status_change. Omit or null on first check.",
"type": [
"string",
"null"
]
},
"condition": {
"description": "detector status_change, keyword, text_diff, or numeric_threshold. text_diff: selector?, ignore[], min_change_ratio. numeric_threshold: selector or jsonpath, op, value, currency?",
"type": "object"
},
"target": {
"description": "URL target. type=url, render=never. selector optional.",
"type": "object"
}
},
"required": [
"target",
"condition"
]
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"condition": {
"properties": {
"detector": {
"enum": [
"status_change",
"keyword",
"text_diff",
"numeric_threshold"
],
"type": "string"
},
"params": {
"type": "object"
}
},
"required": [
"detector"
],
"type": "object"
},
"confidence": {
"type": "number"
},
"fired": {
"type": [
"boolean",
"null"
]
},
"id": {
"description": "Stable check id (chk_ + ULID).",
"type": "string"
},
"observation": {
"properties": {
"canonical_url": {
"type": "string"
},
"checked_at": {
"type": "string"
},
"hash": {
"type": "string"
},
"http_class": {
"type": "string"
},
"http_status": {
"type": "number"
},
"signals": {
"items": {
"type": "string"
},
"type": "array"
},
"status": {
"enum": [
"live",
"closed",
"unknown"
],
"type": "string"
},
"summary": {
"type": "string"
},
"title": {
"type": "string"
}
},
"required": [
"status",
"signals",
"http_status",
"http_class",
"hash",
"summary"
],
"type": "object"
},
"price_usd": {
"type": "number"
},
"receipt": {
"properties": {
"hash": {
"type": "string"
},
"signature": {
"type": "string"
},
"signer": {
"type": "string"
},
"verify_url": {
"type": "string"
}
},
"required": [
"hash",
"verify_url"
],
"type": "object"
},
"target": {
"properties": {
"render": {
"enum": [
"never"
],
"type": "string"
},
"selector": {
"type": [
"string",
"null"
]
},
"type": {
"enum": [
"url"
],
"type": "string"
},
"url": {
"type": "string"
}
},
"required": [
"type",
"url",
"render"
],
"type": "object"
}
},
"required": [
"id",
"target",
"condition",
"observation",
"fired",
"confidence",
"price_usd",
"receipt"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}