# Octroi developer docs

> Octroi is a dataset of European accommodation and city taxes in Ed25519-signed releases, with a calculator that quotes a stay's taxes to the cent. These docs cover quoting a stay, resolving a place, verifying a signed release and fetching releases over HTTP.

## Docs

- [Developer docs [for the tax data and its calculator]](https://octroi.app/developers/index.md): How to load a signed Octroi release, quote a stay's accommodation and city taxes to the cent, resolve a place and fetch releases over HTTP.
- [Quickstart](https://octroi.app/developers/quickstart.md): Load a signed Octroi release, quote three nights at a 4-star hotel in Barcelona for two adults and a child, and read the lines, totals and evidence.
- [Quote a stay](https://octroi.app/developers/quote.md): The quote request and every field of the answer, from lines, nights and evidence to unknowns, totals and assumptions, in integer minor units.
- [Resolve a place](https://octroi.app/developers/resolve.md): Name a place by jurisdiction id or LAU code, and get the charges in force there on a date, with their rates, exemptions and evidence.
- [Releases and signatures](https://octroi.app/developers/releases.md): Release ids, what a release holds, the signed manifest, checking its Ed25519 signature and file hashes, and running the conformance vectors.
- [Coverage and unknowns](https://octroi.app/developers/coverage.md): The twelve countries a release covers, how much of each, and how a quote or resolve answer says what it can't price instead of guessing.
- [Tokens and HTTP delivery](https://octroi.app/developers/delivery.md): Fetch Octroi releases over HTTP with a bearer token: the newest release, its files, the signing key, caching, and every error code.

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