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Stack Facts: LLM Model Price & Change Watch Feed
x402
Stack Facts: LLM Model Price & Change Watch Feed is a paid API for AI agents from g5joilnmeep4ntz3nwezxt5dmu.srv.us, paid per call via x402, $0.012/call, status unknown (last checked 2026-10-19).
Monitors a list of LLM models for pricing changes, additions, and removals, returning signed diffs with alert summaries since a given snapshot cursor.
Price / call$0.012
Success—
StatusUnknown
How this service works
Check a package before install: malware, known vulnerabilities (OSV), exploited CVEs (CISA KEV) and end-of-life, plus LLM prices; signed answers, pay per call in USDC, no account or API key.
Output
Returns a signed JSON payload containing: a 'since' and 'to' snapshot cursor pair for polling continuity, counts of added/removed/modified/alerting models, per-model change details (what changed and in which fields), a SHA-256 signature for integrity verification, dataset attribution and licence info, and a 'next' instruction for the following poll call. The 'meta' block includes the snapshot timestamp, staleness flag, key ID, and manifest URL.
Example use cases
Detect surprise LLM price hike
“Check openai/gpt-4o and anthropic/claude-3-opus for any pricing changes since my last snapshot token 'models-20261009T050000Z-044bcb8b' and tell me if costs went up.”
Alert on deprecated model removal
“Watch mistral/mistral-7b and openai/gpt-4-turbo for me — let me know if either has been removed from the catalog or marked as end-of-life in the last 30 days.”
Automated cost-monitoring pipeline
“Poll the model watch feed for openai/gpt-4o, google/gemini-1.5-pro, and meta/llama-3-70b with a 60-day warning window and give me a summary of everything that's changed since the last cursor.”
Technical details
Endpoint
POSThttps://g5joilnmeep4ntz3nwezxt5dmu.srv.us/v1/models/watch?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need cryptographically signed, verifiable LLM pricing change data on a polling basis without managing an account or API key — particularly when you want cursor-based diffing (only what changed since last check) rather than a full catalog dump. Prefer it over scraping LiteLLM or provider docs directly when you need auditability (signature + SHA-256) and pay-per-call economics with no subscription commitment.
Side effects
- Invalid or expired 'since' cursor returns an error or resets to latest snapshot
- Unknown model IDs are returned in the 'unknown' array rather than causing a failure
- Exceeding 50 models in the request array triggers a validation error
- Payment not included or insufficient USDC causes a 402 response before any data is returned
- Stale data flagged in meta.stale field if upstream source is delayed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| since | string | |
| models | array | |
| warn_days | integer |
Output
Schema · Response
{
"type": "json",
"example": {
"data": {
"to": "models-20261009T060000Z-f99d55c9",
"next": "POST /v1/models/watch with \"sin…",
"note": "Fields are the live values; cha…",
"since": "models-20261009T050000Z-044bcb8b",
"counts": {
"added": 0,
"removed": 1,
"unknown": 0,
"alerting": 3,
"modified": 2
},
"matched": 3,
"results": [
{
"id": "openai/gpt-4o",
"model": {},
"alerts": [
"modified"
],
"change": "modified",
"requested": "openai/gpt-4o",
"changed_in": [
{}
]
}
],
"unknown": [],
"warn_days": 90,
"snapshots_merged": 1
},
"meta": {
"as_of": "2026-10-09T06:00:00Z",
"stale": false,
"key_id": "sf-test-1",
"notice": "Normalised (modified) from the …",
"sha256": "f99d55c9aa420561de698d63d70d916…",
"source": "https://raw.githubusercontent.c…",
"dataset": "models",
"licence": "MIT",
"signature": "mhC9-Y6gzfCx8r9mtDum1G5J2dhSKV5…",
"attribution": "Pricing data derived from LiteL…",
"snapshot_id": "models-20261009T060000Z-f99d55c9",
"manifest_url": "/v1/models/manifest",
"retrieved_at": "2026-10-09T06:00:00.000Z"
}
}
}Tags
x402
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