A neutral, read-only Cardano data API — token, market, NFT, project, category, governance, and Catalyst data, consolidated over open sources. Every response carries its provenance. No key, no signup.
The Cardano Data Layer is a thin, neutral consolidation API over open Cardano data sources (Koios, the CIP-26 token registry, DexHunter/Minswap, OpenCNFT) and this project's preservation and observatory memory layers. It does not host a wallet, take writes, rank, or give advice — it answers GET requests with data, each tagged with where it came from and how much to trust it.
Built as ecosystem infrastructure, partly in response to the wind-down of closed analytics platforms: open, reproducible, and provenance-first.
Metadata, supply, price, holders, rankings.
/token/{unit}/tokens/topSpot price, OHLCV candles, market overview.
/price/{unit}/ohlcv/{unit}?interval=1hCollection floor, volume, sales (by policy).
/nft/collection/stats?policy=…Curated project memory with provenance + history.
/projects/project/{id}The ecosystem taxonomy, preserved as-found.
/categories/category/{slug}DReps, governance actions, votes, treasury.
/dreps/actions/treasuryPreserved Catalyst archive: funds, proposals.
/archive/funds# health curl https://api.asy.life/health # a token, merged detail (metadata + supply + price + holders) curl https://api.asy.life/token/279c909f348e533da5808898f87f9a14bb2c3dfbbacccd631d927a3f534e454b # spot price curl https://api.asy.life/price/279c909f348e533da5808898f87f9a14bb2c3dfbbacccd631d927a3f534e454b # defunct projects (preserved project memory) curl "https://api.asy.life/projects?status=defunct" # top DReps and the treasury curl https://api.asy.life/dreps curl https://api.asy.life/treasury # the machine-readable spec curl https://api.asy.life/openapi.json
A _quality block on every response tells you the source, how authoritative it is, and how fresh:
| 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 | realtime · ~5m · hourly · daily · static · on-demand |
confidence | high · medium · low |
provenance | how the value was derived |