# Elpia

> Active time in games and apps becomes Drops. One Drop is one cent that goes to a project the person picks, and every donation is published as a Deed with a receipt.

Drops are backed by money the owner deposited in advance, so nothing can be promised that is not already paid for. Rules, prices and postings are append-only: a change is a new version with a date and a reason, never a rewrite. Impact types are never added up or ranked against each other, and a CO₂e figure never means compensation.

## Pages

- [Catalog](https://elpia.org/catalog): what Drops can be redeemed for, by category, with prices and pool progress.
- [Deeds](https://elpia.org/deeds): every payment that was made, with its receipt and who contributed.
- [Impact](https://elpia.org/impact): what the Deeds financed, and the CO₂e behind it with its sources and limits.
- [Our footprint](https://elpia.org/footprint): what the server (hosting provider's estimate) and all visits (from daily byte totals) cause per day, week, month or year, next to the Deeds' CO₂e for the same days; never offset against each other.
- [Transparency](https://elpia.org/transparency): where the money is, which rules are active, and the full changelog.
- [Privacy](https://elpia.org/privacy): what is stored, what is not, and how to export or delete an account.

## API

- [For developers](https://elpia.org/developers): authentication, limits and house rules.
- [REST reference](https://elpia.org/developers/rest): every endpoint.
- [OpenAPI](https://elpia.org/openapi.json): the same endpoints, machine-readable.

## Open endpoints

- GET https://elpia.org/v1/public/rules: The earning rules that are active right now.
- GET https://elpia.org/v1/public/changelog: Every rule version with its reason, plus every budget deposit. Nothing is ever changed in place.
- GET https://elpia.org/v1/public/budget: Where the money behind the Drops is: deposited, not yet issued, in wallets, reserved, donated.
- GET https://elpia.org/v1/public/catalog: The redemption catalog by category, with current prices and pool state.
- GET https://elpia.org/v1/public/catalog/:slug: One project with its complete price history.
- GET https://elpia.org/v1/public/deeds: All settled payouts. Contributors who chose anonymity have `name: null`.
- GET https://elpia.org/v1/public/deeds/:id: One Deed with its proof: the snapshot frozen at payout time, the ledger posting and a fresh check of the receipt hash.
- GET https://elpia.org/v1/public/payouts/:id/receipt: The receipt file of a payout, so anyone can hash it themselves.
- GET https://elpia.org/v1/public/impact: The headline totals: donated and queued Drops, Deeds, contributors.
- GET https://elpia.org/v1/public/stats: What the Deeds financed per project, with CO₂e grouped by period, impact type and how well the figure is backed. Living units are counted from the day they were paid for, so the totals grow on their own.
- GET https://elpia.org/v1/public/map: Activity per country for the world map. Never finer than a country.
- GET https://elpia.org/v1/public/footprint: The server's estimated CO₂e and water use as reported by the hosting provider, the website's traffic, and what the Deeds dealt with in the same days. They stand side by side; nothing is offset or subtracted.