Retail resale arbitrage check — "if I buy this at this price, what do I clear reselling it?" Live eBay ask comps (each linked to its listing; web-grounded fallback), fee math for e

Retail resale arbitrage check — "if I buy this at this price, what do I clear reselling it?" Live eBay ask comps (each linked to its listing; web-grounded fallback), fee math for eBay/Amazon/StockX/Poshmark/Mercari, profit + ROI at low/median/high comps, best-venue table, FLIP / THIN / PASS verdict. Returns INSUFFICIENT_EVIDENCE rather than an invented price.

price-ascending: candidates are ordered by the listed price of the operation, with no managed-first preference applied. Unlike /v1/apis, this surface does not rank Apiosk-settled listings above federated ones — a comparison that reorders on commercial grounds is not a comparison. Pass sort=managed_first for the catalog's ordering.

Compared: listed price, settlement rail and input compatibility. Not measured yet: latency, reliability, result quality, and provider terms such as rate limits, jurisdiction and licensing.