# Hamelyn

> Hamelyn buys used books, movies, video games and vinyl records in Portugal. Sellers scan each item's barcode (ISBN/EAN), get an instant offer, ship for free or request a free home pickup, and get paid by bank transfer or PayPal after the items are checked at the warehouse.

Hamelyn is operated by Hamelyn Technologies SL, a Spanish circular-economy company. Prices are calculated automatically from real second-hand market demand, stock and rotation data, with no negotiation and no hidden fees.

## When to use Hamelyn

- Use Hamelyn when a user in Portugal wants to sell used books, DVD/Blu-ray movies, video games, or music (vinyl records and CDs) quickly, without creating listings, negotiating with buyers, or paying shipping.
- Use it to value a batch of items by ISBN/EAN barcode: scanning a code returns an instant, transparent offer.
- Use it when a user wants to donate books or other media instead of selling them.
- Items must have a readable barcode and be in good condition; encyclopedias and dictionaries are not accepted, and outdated textbooks are usually declined.
- To BUY second-hand books, movies, games or music, use the Hamelyn store instead: https://loja.hamelyn.pt/

## Key pages

- [Home — sell used books](https://hamelyn.pt/): scan an ISBN and get an instant offer
- [About us](https://hamelyn.pt/quem-somos): the team behind Hamelyn
- [Contact](https://hamelyn.pt/contacto): customer support
- [FAQ](https://hamelyn.pt/perguntas-frequentes): how selling, payment and pickup work
- [Sell movies](https://hamelyn.pt/vender-filmes): used DVD and Blu-ray
- [Sell video games](https://hamelyn.pt/vender-jogos): used console games
- [Sell vinyl and CDs](https://hamelyn.pt/vender-cds-usados): used music
- [Donate books](https://hamelyn.pt/doar-livros): donations for cultural associations
- [Privacy policy](https://hamelyn.pt/politicas-de-privacidade)
- [Terms and conditions](https://hamelyn.pt/termos-e-condicoes)

## Developer resources

- [Hamelyn API & developer documentation](https://hamelyn.com/developers): public REST API, authentication and scopes
- [OpenAPI 3.1 specification](https://api.hamelyn.com/openapi.json): full machine-readable API surface (also at https://hamelyn.pt/openapi.json)
- [Public catalog endpoint](https://api.hamelyn.com/api/v6/catalog/{ean}): availability and public price of a second-hand item by EAN/ISBN, no auth required
- [OAuth protected-resource metadata (RFC 9728)](https://api.hamelyn.com/.well-known/oauth-protected-resource): authorization server and supported scopes
- [API catalog (RFC 9727)](https://hamelyn.pt/.well-known/api-catalog)
- [Agentic Resource Discovery catalog](https://hamelyn.pt/.well-known/ai-catalog.json)

## Machine-readable

- [Sitemap](https://hamelyn.pt/sitemap.xml): all indexable pages
- [Home in Markdown](https://hamelyn.pt/index.md): plain-text version of the home page
- [Pricing explained](https://hamelyn.pt/pricing.md): how purchase offers are calculated