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Pricing State API — SaaS Pricing Change History
x402
Pricing State API — SaaS Pricing Change History 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 2026-10-30).
Returns the historical change log for a monitored SaaS product's pricing page, including what changed, when, and a human-readable summary.
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 Not a live scrape-any-URL service and not unpublished or negotiated rates.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 a list of pricing change events for the specified SaaS product, each with a human-readable summary (e.g. 'Business plan price changed from $40 to $45 per seat/month'), a changeType enum (e.g. 'price_changed'), and a detectedAt ISO timestamp. Also includes the monitor's name and slug for reference.
Example use cases
Competitive SaaS pricing intelligence
“I'm evaluating project management tools — can you check whether Linear has changed their pricing in the last few months and summarize what changed?”
Budget alert for finance team
“Our SaaS budget review is coming up — can you look up the full pricing change log for Notion and Slack so I can see if there have been any price increases we need to account for?”
Procurement due diligence check
“Before we renew our Vercel contract, can you check if they've made any pricing changes recently? I want to see the change history with dates and what specifically changed.”
Technical details
Endpoint
GEThttps://pricing-state-api.replit.app/api/monitors/%7Bslug%7D/changes?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need historical pricing change events for a specific SaaS product — not just the current pricing snapshot. It is ideal for competitive monitoring workflows, budget reviews, procurement decisions, or any agent that needs to know *when* and *how* pricing changed over time. Prefer this over a current-pricing endpoint when change history or diff context is the primary need.
Side effects
- Unknown or unsupported slug returns 404 or empty changes array
- Service unavailable if the Replit-hosted app is sleeping or overloaded
- Payment failure (x402) if USDC balance is insufficient or Base network is congested
- Stale data if the pricing page hasn't been re-crawled recently
- Slug format errors (e.g. using the product's full name instead of its slug)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"limit": 20,
"total": 37,
"changes": [
{
"id": 42,
"details": [
{
"kind": "price_changed",
"after": "10",
"before": "8",
"planName": "Pro"
}
],
"summary": "\"Pro\" price changed: $8 → $10",
"detectedAt": "2026-08-01T12:00:00Z"
}
],
"hasMore": true,
"nextBefore": "MjAyNi0wOC0wMVQxMjowMDowMC4wMDAwMDBafDQy",
"monitorSlug": "example-saas"
}
}Tags
x402
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