MarketParquet vs Nasdaq Data Link (formerly Quandl)
> marketplace of paid datasets; the free WIKI feed is frozen
Quandl was acquired by Nasdaq and rebranded to Nasdaq Data Link in 2021, and the free WIKI end-of-day US stock dataset everyone used stopped updating back in 2018. What's left is a marketplace of separately-priced datasets. If you're here looking for a Quandl or WIKI-prices replacement, MarketParquet is a live, daily-updated US OHLCV archive as Parquet -- here's the honest comparison.
Side-by-side
| Nasdaq Data Link (formerly Quandl) | MarketParquet | |
|---|---|---|
| What it is | marketplace of 350+ third-party datasets (formerly Quandl) | one US stocks/ETFs/futures OHLCV archive |
| Free WIKI EOD dataset | frozen since April 2018 (no longer updated) | updated daily; free recent sample |
| US equity history | via Sharadar (from 1998) or QuoteMedia EOD | stocks/ETFs from 2000, futures from Dec 2007 |
| Format | REST / Tables API, CSV/JSON, Python/R | Apache Parquet, by-date partitioned |
| Intraday | mostly end-of-day (equity datasets) | 1-minute to daily bars |
| Pricing | per-dataset subscriptions (~$9-69/mo personal; pro quote-gated) | one-time $79 |
| Real-time data | no -- historical / reference | no -- end-of-day batch only |
| Survivorship bias | dataset-dependent (Sharadar clean; QuoteMedia EOD active-only) | delisted tickers included |
| Adjustments | dataset-dependent | split-adjusted |
Where Nasdaq Data Link (formerly Quandl) wins
- Nasdaq-backed marketplace: one account reaches 350+ curated datasets across equities, fundamentals, economics, and alternative data.
- Flagship Sharadar equity data is survivorship-bias-free back to 1998 with multiple adjustment methods and full corporate actions.
- Strong alternative-data catalog (sentiment, ESG, supply-chain) that's hard to source elsewhere.
- Clean REST/Tables API with official Python and R libraries.
Where MarketParquet wins
- A live, daily-updated replacement for the free Quandl WIKI EOD dataset, which has been frozen since 2018.
- One flat $79 for the whole US archive vs stacking separate per-dataset monthly subscriptions.
- Parquet bulk files (by trading day) plus 1-minute intraday -- most Nasdaq Data Link equity datasets are end-of-day only.
- One dataset to learn, not a marketplace of publishers with differing coverage, adjustments, and delisted handling.
Which to pick
Pick Nasdaq Data Link (formerly Quandl) if you need fundamentals, economic, or alternative datasets, or want Sharadar's point-in-time equity data with index-constituent history.
Pick MarketParquet if you want a modern, daily-updated replacement for the free Quandl WIKI prices -- bulk US OHLCV as Parquet, intraday included, one-time price.
FAQ
What happened to Quandl?
Nasdaq acquired Quandl in December 2018 and rebranded the platform to Nasdaq Data Link in September 2021. The popular free WIKI end-of-day US stock dataset stopped updating on April 11, 2018 -- it's still downloadable but frozen and no longer recommended, which is why many people search for a Quandl or WIKI alternative.
What's a good replacement for the Quandl WIKI prices dataset?
For free, updated US end-of-day data, MarketParquet offers a free recent-daily sample; its complete archive (stocks, ETFs, futures, 1-minute to daily, split-adjusted, delisted included) is a one-time $79 as Parquet. Within Nasdaq Data Link itself, the closest live replacement is the paid Sharadar equity dataset.
Is Nasdaq Data Link free?
It has a free API key with rate limits and some free open datasets, but the free WIKI equity prices are frozen at 2018. Current US equity coverage comes from paid datasets (e.g., Sharadar, roughly $9-39/month personal use; professional pricing is quote-based). MarketParquet is a one-time $79 with a free sample.
Is Nasdaq Data Link survivorship-bias-free?
It depends on the dataset. Sharadar's equity prices are survivorship-bias-free back to 1998; the QuoteMedia end-of-day dataset covers active listings only and carries survivorship bias. MarketParquet includes delisted tickers across its US coverage so backtests aren't survivorship-biased.
> Pricing and feature snapshots reflect public information at time of writing and may shift. Always confirm against Nasdaq Data Link (formerly Quandl)'s own pricing page before committing.