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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 2026-09-10).
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
Real-time structured SaaS pricing data for AI agents. Monitors public pricing pages (Notion, Linear, Vercel, Figma, Claude, Cursor, GitHub, Slack, and more) and returns clean JSON with plans, prices, billing periods, features, and change history. Free discovery endpoints. Paid endpoints: $0.01 USDC per call via x402 on Base. No API keys required.
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/changesWhen 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)
Output
Schema · Response
{
"type": "json",
"example": {
"changes": [
{
"summary": "Business plan price changed from $40 to $45 per seat/month",
"changeType": "price_changed",
"detectedAt": "2026-08-01T12:00:00Z"
}
],
"monitor": {
"name": "Linear",
"slug": "linear"
}
}
}Tags
x402
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