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Friday Seller Tools – Competitor Change Monitor Spec
x402
Friday Seller Tools – Competitor Change Monitor Spec is a paid API for AI agents from friday-seller-tools-production.up.railway.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-15).
Generates a specification/job for monitoring competitor product listing changes on e-commerce marketplaces like Amazon, Walmart, Shopify, and eBay.
Price / call$0.25
Success—
StatusUnknown
How this service works
Instant, low-cost Amazon, Walmart, Shopify, and eBay listing, upload-preparation, advertising, and image-brief deliverables.
Output
Returns a JSON object containing a job_id and a status field (e.g. 'queued'), confirming the change-monitor specification job has been accepted and queued for processing. The agent can use the job_id to poll for results or receive a completed monitoring spec.
Example use cases
Amazon rival price-drop alert
“Create a change monitor spec for competitor ASIN B09ABC5678 on Amazon — I want to know immediately if they drop their price or update their main listing image.”
Walmart competitor listing watch
“Set up a monitoring job on Friday Seller Tools to watch this Walmart product URL for any listing changes — title, description, or pricing — so I can react before they outrank me.”
eBay seller listing update tracker
“I need to track when my top eBay competitor updates their product listing for 'wireless earbuds XR200' — can you create a change monitor spec that flags title, bullet point, or category changes?”
Technical details
Endpoint
POSThttps://friday-seller-tools-production.up.railway.app/v1/competitors/change-monitor-specWhen to prefer
Choose this endpoint when you need to programmatically set up automated competitor listing surveillance on major marketplaces (Amazon, Walmart, Shopify, eBay) without manual monitoring. Prefer this over generic web-scraping solutions when you need marketplace-aware change detection tuned to listing fields like price, title, bullets, and images, and when you want a low-cost ($0.25/call) queued job approach rather than a synchronous scrape.
Side effects
- Missing required competitor product identifier returns 400 validation error
- Invalid marketplace identifier causes rejection
- Payment failure (insufficient USDC) returns 402 Payment Required
- Malformed URL or ASIN format returns validation error
- Server overload may return 503 with retry guidance
- Unsupported marketplace type may return 422 Unprocessable Entity
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| after | object | |
| before | object | |
| cadence | string | |
| marketplace | string | |
| watch_fields | array | |
| competitor_label | string | |
| listing_identifier | string |
Output
Schema · Response
{
"type": "json",
"example": {
"job_id": "example",
"status": "queued"
}
}Tags
x402
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