# DEBYKO

> Crypto derivatives data from every venue that quotes an instrument, with the evidence attached.

Documentation of the DEBYKO API v2 and DQL, its query language. This file is generated from the pages of the site when it is built.

## Start

- [What DEBYKO is](https://docs.debyko.com/start/what-debyko-is/): Crypto derivatives data from every venue that quotes an instrument, with the evidence attached.
- [Without a key](https://docs.debyko.com/start/without-a-key/): What you can read before you decide to pay for anything.
- [Your first request](https://docs.debyko.com/start/first-request/): A request that needs no key and returns real data, in one line.
- [Keys and plans](https://docs.debyko.com/start/keys-and-plans/): How a key is sent, and what a plan changes.
- [Venues in DQL](https://docs.debyko.com/start/venues/): Every venue a query can name, read from the platform when this page was built.

## DQL

- [The guide](https://docs.debyko.com/dql/guide/): DQL by example, every answer produced by the engine.
- [Syntax](https://docs.debyko.com/dql/syntax/): The whole language on one page: grammar, a query and a real answer for each part of it.
- [Fields and functions](https://docs.debyko.com/dql/reference/): Every name a query may use, each with a query that reads it and the value it returned.
- [Cookbook](https://docs.debyko.com/dql/cookbook/): Queries that answer a question somebody actually has.
- [How the language behaves](https://docs.debyko.com/dql/corpus/): The conformance corpus: every case the engine is held to on every build.
- [Decided and not yet](https://docs.debyko.com/dql/not-yet/): What the language has settled, deferred and will not do.
- [Changelog](https://docs.debyko.com/dql/changelog/): How DQL changed, set by set.
- [Selecting with DQL](https://docs.debyko.com/dql/selecting/): How the data endpoints choose which listings to answer for.

## API v2

- [Reference](https://docs.debyko.com/api/reference/): Every endpoint, its schema and its examples, from the document the API itself publishes.
- [Endpoints](https://docs.debyko.com/api/endpoints/): What each endpoint answers, what it takes and what it refuses.
- [Limits and batches](https://docs.debyko.com/api/limits/): What one query may be, and what one request may ask for.
- [Errors](https://docs.debyko.com/api/errors/): Every code, with an input that produces it and the message the parser gives.
- [Migrating from exchange APIs](https://docs.debyko.com/api/migrating/): The differences that actually cost you time, and what the platform will not do.
- [Pay with USDC](https://docs.debyko.com/api/pay-with-usdc/): Read the data without an account, or buy a plan for 30 days: one USDC payment on Base, what the 402 looks like, what you get back, and how to poll the state of your Agent rules.
- [Paying per call with x402](https://docs.debyko.com/api/x402/): Read the data without an account: one USDC payment on Base per request, what it costs, what is payable and what happens when something goes wrong.
- [Connect an AI agent](https://docs.debyko.com/api/connect-an-ai-agent/): Give an AI agent the DEBYKO data as tools: one URL, signed in with your DEBYKO account or with your key, nothing to install.

## Data

- [Venues and layers](https://docs.debyko.com/data/venues-and-layers/): What the platform collects, layer by layer, and what each layer holds.
- [Statuses and reasons](https://docs.debyko.com/data/statuses/): The five statuses, and every reason a value can be null.
- [Freshness and cadence](https://docs.debyko.com/data/freshness/): How long each value is good for, what it rests on, and why a stale value is not returned as a value.
- [Archive](https://docs.debyko.com/data/archive/): The tick-level history of the core and top-100 listings as Parquet files, one per listing, layer and UTC day: what is in them, how to list and fetch them, how to read them, and how to check them.
- [Retention](https://docs.debyko.com/data/retention/): How far back a question can be asked.
- [Check it yourself](https://docs.debyko.com/data/check-it-yourself/): Five requests that show how long each value is good for, what happens when it is not, and that the past is not rewritten.

## Agent

- [Agent](https://docs.debyko.com/agent/): What it will be, why it is not an endpoint, and what it will deliberately not watch.

## Studio and plans

- [Studio & plans](https://docs.debyko.com/plans/): Tiers, keys and billing.

## Attest

- [Verify an anchor](https://docs.debyko.com/attest/verify/): How a row of DEBYKO history is proved to be under a Merkle root posted on Base, and a verifier that needs nothing but SHA-256.