Tell Aggario what you want. Aggario finds it, values it, negotiates it, and helps you get it. Aggario is an AI buying agent for secondhand and marketplace shopping, built for people who want a good deal without watching listings all day.
How it works
Describe a buying objective in plain language and set a hard maximum price.
An Aggario Watch keeps looking at the sources you connect or import from.
The Aggario Score rates match quality and value against an estimated fair-value range.
An Aggario Offer drafts the opening message; you review and send it yourself.
Save or pass on listings, and review everything Aggario found in alert history.
Connector status
eBay — beta, credential-dependent. Live search uses eBay's official developer Browse API and activates when developer credentials are configured.
OfferUp — import-assisted. You sign into your own OfferUp account in a normal browser or app session; Aggario never captures or stores marketplace credentials. Listings come from you via link, share sheet or pasted text. Live watch is unavailable pending marketplace authorization, because automated access requires OfferUp's prior written consent.
Facebook Marketplace — import-assisted. Same approach: your own signed-in session, then share or paste the listing into Aggario. Live watch is unavailable pending marketplace authorization, because automated collection requires express written permission from Meta.
Etsy — beta, credential-dependent. Keyword search uses Etsy's official Open API v3 active-listings endpoint and activates when app credentials are configured. No end-user sign-in is required for public listing search. The term "Etsy" is a trademark of Etsy, Inc. This application uses the Etsy API but is not endorsed or certified by Etsy, Inc.
StockX — beta, catalog and market data. Aggario uses StockX's official Public API for catalog search and product market data (lowest ask, highest bid) to sharpen fair-value ranges. These rows are market data for a catalog product, not an individual seller's listing, and are labelled that way in the app. Activation requires StockX developer access and credentials. Aggario is not affiliated with, endorsed by or sponsored by StockX.
Reverb, Discogs, Walmart, Amazon — owner-blocked. Official APIs exist, but they require application registration, business/affiliate approval, or terms verification before Aggario could use them for buyer search. Reverb's API terms also restrict using API content for machine learning unless expressly authorized.
Mercari, Poshmark, Depop, Vinted, Grailed, GOAT, Nextdoor, Craigslist — import-only. No official public buyer-search API is documented for these sources, and Craigslist's official programmatic interface covers bulk posting rather than buyer search. You can still paste or share a listing link from any of them and Aggario will normalize, value and score it.
Responsible automation
Aggario does not scrape marketplaces or bypass access controls, and never messages a seller for you. Any future user-authorized automation will be opt-in and reversible, with your hard maximum price enforced in code rather than by an AI model.
Signing into a marketplace in your own browser or app session does not authorize Aggario to browse continuously, control the marketplace interface, or collect data on your behalf. Aggario does not drive marketplace UIs, click through listings automatically, or send messages. Authorized UI or API automation would only ever run behind a permission-gated connector, after the marketplace grants permission and you opt in.