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Pricing State API — Set Change Feed
x402
Pricing State API — Set Change Feed is a paid API for AI agents from pricing-state-api.replit.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-11).
Returns a paginated feed of detected pricing changes (plan names, prices, billing periods) for all vendors in a named SaaS/cloud catalog set (inference or devtools), filtered by a time cursor.
Price / call$0.01
Success—
StatusUnknown
How this service works
Closed catalog of public SaaS and cloud pricing pages, grouped into two named sets (inference and devtools). Each listed vendor is fetched on a ~6 hour schedule in a real browser, extracted into one JSON shape (plan names, prices, currency, billing period, printed price text, features when present, snapshot time), and diffed for detected plan/price/billing-period changes. The paid unit is the set change feed, GET /api/sets/{set}/changes: 0.01 USDC on Base via x402 v2, charged only when a change was recorded after your since cursor, and free when the window is empty. Per-slug snapshot and changes calls remain 0.01 USDC each. Not a live scrape-any-URL service and not unpublished or negotiated rates. Discover sets and slugs free at GET /api/sets and GET /api/monitors. No API key.
Output
A JSON object containing the set name, the since timestamp, a cursor for the next poll, an array of change records (each with vendor slug, change ID, list of change details with kind/plan/before/after values, human-readable summary, detectedAt timestamp, and source pricing page URL), a charged boolean indicating whether the window was non-empty, a hasMore flag, and an optional nextBefore pagination cursor.
Example use cases
Weekly AI pricing change digest
“Give me a summary of every pricing change detected in the inference set since last Monday — which vendors changed prices, which plans were affected, and by how much?”
Devtools price hike alert
“Check the devtools set for any pricing changes since November 15 2026 and let me know if any plan prices went up so I can review our SaaS budget.”
Automated pricing change poller
“Poll the inference set for new pricing changes since the cursor I last used — 2026-09-12T08:30:00Z — and return the next batch of up to 50 changes if any exist.”
Technical details
Endpoint
GEThttps://pricing-state-api.replit.app/api/sets/%7Bset%7D/changes?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to efficiently poll for new SaaS or cloud pricing changes across a curated vendor catalog without scraping individual pages yourself. Prefer it over generic web scraping when you want structured, diffed, timestamped pricing change records in a consistent JSON shape with cursor-based pagination. Best suited for recurring agent workflows that check periodically for price movements in the inference or devtools vendor sets, especially when cost efficiency matters — the call is free when no changes exist in the requested window.
Side effects
- Empty window returns charged:false and an empty changes array — no charge incurred
- Invalid set name (not 'inference' or 'devtools') returns a 400 or 404 error
- Malformed since timestamp (non-ISO 8601) returns a validation error
- Payment failure via x402 returns a 402 Payment Required response
- Invalid before cursor format returns a 400 error
- Limit out of range (< 1 or > 100) returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"set": "inference",
"limit": 20,
"since": "2026-09-01T00:00:00Z",
"cursor": "2026-09-12T08:30:00.000Z",
"changes": [
{
"slug": "example-saas",
"change": {
"id": 42,
"details": [
{
"kind": "price_changed",
"after": "10",
"before": "8",
"planName": "Pro"
}
],
"summary": "\"Pro\" price changed: $8 → $10",
"detectedAt": "2026-09-12T08:30:00.000Z"
},
"sourceUrl": "https://example.com/pricing",
"detectedAt": "2026-09-12T08:30:00.000Z",
"snapshotAt": "2026-09-12T08:30:00.000Z"
}
],
"charged": true,
"hasMore": false,
"nextBefore": null
}
}Tags
x402
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