Cardano Data Layer API

A neutral, read-only Cardano data API — token, market, NFT, project, category, governance & Catalyst data, consolidated over open sources. Documentation, not a product.

Base URL: — · Spec: /openapi.json · Health: /health · Source: github.com/cryptoleo79/cardano-data-layer

What this is

A thin, neutral consolidation layer over open Cardano data sources (Koios, CIP-26, DexHunter/Minswap, OpenCNFT) and the project's own preservation/observatory memory layers. It does not host a wallet, take writes, or give advice. Every endpoint is a GET; no API key is required.

Data quality envelope

Every response carries a _quality block so you always know where a value came from and how much to trust it:

field	meaning
source	upstream(s) the data came from
authority_class	A on-chain · B official · C at-risk platform · D community · E researcher
refresh	cadence: realtime · ~1m · ~5m · hourly · daily · static · on-demand
confidence	high · medium · low
provenance	how the value was derived
as_of	ISO timestamp of the response

Quick start

curl BASE/health
curl BASE/token/279c909f348e533da5808898f87f9a14bb2c3dfbbacccd631d927a3f534e454b
curl BASE/price/279c909f348e533da5808898f87f9a14bb2c3dfbbacccd631d927a3f534e454b
curl "BASE/projects?status=defunct"
curl BASE/dreps
curl BASE/openapi.json

Endpoints