# Pricing State API — Pricing Change History

> Pricing State API — 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 2026-09-15).

Returns the detected history of pricing changes for a monitored SaaS product, including what changed, plan-level detail, and when each change was detected.

## Facts

- Endpoint: POST https://pricing-state-api.replit.app/api/monitors/:slug/changes
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pricing-state-api-pricing-change-history-9b62cdf6
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-oduycjpvLxU0unaO_iyO

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability pricing-state-api-pricing-change-history-9b62cdf6 -d '<json body>'
```

Example prompt: Pull up the full pricing change history for Notion from the Pricing State API — I want to see every plan-level change that was detected and when.

## When to prefer this

Choose this endpoint when you need historical pricing change data for a specific SaaS product — not just current pricing — and want to see a timestamped log of every detected change at the plan level. Prefer this over the current-pricing endpoint when your goal is trend analysis, competitive pricing audits, or alerting on past changes rather than retrieving a snapshot of today's prices.

## Known failure modes

- Invalid or unrecognized slug returns an error or empty result
- Insufficient USDC balance causes payment failure and no data returned
- Slug for a product not yet being monitored returns no history
- Network or service downtime on the Replit-hosted API returns a 5xx error

## How this service works

$0.01 USDC required (x402 / Base)

Returns the history of detected pricing changes: what changed, plan-level detail, and when each change was detected.

No API key needed. Pay with any x402-compatible wallet that holds USDC on Base. If your agent does not yet have a funded wallet, set one up via Coinbase Agentic Wallet or Base MCP — then standard x402 clients will pay and retry automatically.

## Output

A structured list of historical pricing changes for the specified monitored SaaS product, including which plans changed, the nature of each change (e.g. price increase, plan addition/removal), and the timestamp when each change was detected.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pricing-state-api-pricing-change-history-9b62cdf6/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pricing-state-api.replit.app](https://www.zero.xyz/host/pricing-state-api.replit.app/llms.txt)