Current sources
- DeFiLlama API family: Chains, protocols, stablecoins, fees, DEX volume, and yield pools.
- Hyperliquid public API: Perps open interest, funding, and order-book depth where available.
- Public Ethereum RPC: Block height for the live header pulse.
- Fear & Greed Index: Sentiment context in The Almanac.
- blockchain.com explorer data: Bitcoin network context such as hashrate, difficulty, and halving clock inputs.
- CoinGecko: Market cap, dominance, and price context in The Almanac, with attribution.
- mempool.space: Bitcoin mempool and fee context.
Source rule
We do not build on a feed whose terms forbid the product we are shipping. Where a provider allows display with attribution but forbids resale, we display derived readings and avoid re-serving the raw feed.
Why open data is enough
Bathymark's moat is not secret data access. It is selection, synthesis, ranking, plain-language explanation, and the habit of stating limits. Read the wider strategy in methodology.