Livecheck Sentinel watch
Livecheck Sentinel watch - 30-day URL condition watcher. POST /v1/watch with {target, condition, callback, interval_s}. Detectors: status_change, keyword (same as /v1/check). HMAC-signed callbacks. Returns wtc_ id, owner_token (once), baseline, and a signed receipt. Fixed $2.50 USDC (2500000 atomic). GET/DELETE /v1/watch/{id} and GET /v1/watch/{id}/events with X-Livecheck-Owner-Token. No Playwright. Not /v1/check ($0.02) and not Confirm.
Not tested: has real-world effectsour last check, 2026-09-24
0 of 0checks answered this week
n/amedian answer time
$2.50listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://livecheck.fly.dev/v1/watch
| Category | Market data |
|---|---|
| Provider host | livecheck.fly.dev |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"callback": {
"deliver": "on_change",
"secret": "whsec_example",
"url": "https://example.com/hooks/livecheck"
},
"condition": {
"detector": "status_change",
"params": {}
},
"interval_s": 900,
"target": {
"render": "never",
"selector": null,
"type": "url",
"url": "https://boards.greenhouse.io/example/jobs/1842"
}
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"callback": {
"description": "url + secret. deliver=on_change or every_check. HMAC-SHA256 over the raw JSON body (X-Sentinel-Signature).",
"type": "object"
},
"chain_budget_usd": {
"description": "Accepted and ignored in Phase 2. run stays none.",
"type": "number"
},
"condition": {
"description": "detector status_change or keyword. Same as POST /v1/check.",
"type": "object"
},
"context": {
"type": "object"
},
"interval_s": {
"description": "Seconds between observations. Min 300, default 900.",
"type": "number"
},
"label": {
"type": "string"
},
"target": {
"description": "URL target. type=url, render=never. render=always is 400 render_not_available.",
"type": "object"
}
},
"required": [
"target",
"condition",
"callback"
]
},
"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": {
"baseline": {
"properties": {
"captured": {
"type": "boolean"
},
"hash": {
"type": "string"
},
"summary": {
"type": "string"
}
},
"required": [
"captured"
],
"type": "object"
},
"checks_remaining": {
"type": "number"
},
"condition": {
"properties": {
"detector": {
"enum": [
"status_change",
"keyword"
],
"type": "string"
},
"params": {
"type": "object"
}
},
"required": [
"detector"
],
"type": "object"
},
"expires_at": {
"type": "string"
},
"first_check_at": {
"type": "string"
},
"id": {
"description": "Stable watcher id (wtc_ + ULID).",
"type": "string"
},
"interval_s": {
"type": "number"
},
"next_check_at": {
"type": "string"
},
"owner_token": {
"description": "Returned once on create. Send as X-Livecheck-Owner-Token.",
"type": "string"
},
"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"
},
"run": {
"enum": [
"none"
],
"type": "string"
},
"status": {
"enum": [
"active",
"stopped",
"expired"
],
"type": "string"
},
"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"
},
"tier": {
"enum": [
"standard"
],
"type": "string"
}
},
"required": [
"id",
"tier",
"owner_token",
"expires_at",
"checks_remaining",
"interval_s",
"first_check_at",
"baseline",
"price_usd",
"receipt"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}