> ## Documentation Index
> Fetch the complete documentation index at: https://docs.defiloops.com/llms.txt
> Use this file to discover all available pages before exploring further.

# What we hold

> The market history this system reads from — pool fees, option volatility, perpetual funding, open interest and liquidations — and where each one stops

The research tools do not call exchanges when you ask a question. They read
recorded history, collected on a schedule, so the same question asked twice
gives the same answer — a backtest whose inputs move is not a backtest.

These are the streams.

## Pool history

Daily price, total value locked, fees earned and in-range liquidity for **41
Uniswap v3 pools** across Ethereum, Base and Arbitrum — **50,469 day-rows**
reaching back to **2021-05-05**.

Fees are the hard part. An indexer values a swap in dollars only if it can price
both tokens, and each deployment keeps its own whitelist — so a pool can record
thousands of trades in a day and report **zero fees**. Where the other side of
the trade is a dollar, the fee is rebuilt exactly, and any row that was rebuilt
is flagged. The tools pass that flag through.

Read by [LP strategies](/tools/list-lp-strategies) and
[backtesting a position](/tools/run-lp-backtest).

## Options and volatility

Deribit's volatility index (**DVOL**) back to **2021-03-24**, plus option chains
used to price structures at strikes away from the money.

<Warning>
  The **skew** — the volatility points added to the at-the-money index to price
  other strikes — is the one number here that is *assumed* rather than measured.
  It moves a hedging result by more than the difference between hedging and not
  hedging, so every answer states the value it used.
</Warning>

Read by [option structures](/tools/list-option-structures) and
[pricing a hedge](/tools/price-options).

## Perpetual funding

Daily funding rates from **Binance** and **Bybit**, back to **2019-09** and
**2021-01** respectively — about **2,080 days** on each of BTC and ETH.

They are kept **separate and never averaged**. The two correlate around 0.85 on
BTC, and where they disagree the disagreement is the reading; a mean would hide
exactly the days worth knowing about.

## Open interest

From Binance's daily archive, at five-minute resolution since **2021-01-01**:
open interest in coins and in dollars, top-trader long/short by position size
*and* by account count, and taker buy/sell volume.

<Note>
  Coverage is **per symbol**, and the archive is walked one day-file at a time, so
  a symbol can be partly filled while another is complete. Ask the tool for the
  current depth rather than reading a figure here — it reports how many days it
  holds, and that number moves.

  An absent or partial series is reported as such — **never as a zero**, because
  an open interest of zero is a claim about the market and is never true.
</Note>

Both of the above are read by
[funding and open interest](/tools/get-funding-and-oi).

## Hyperliquid

A third venue, and it disagrees with the other two in ways that matter rather
than ways that average out. Funding settles **hourly** — twenty-four intervals
in a complete day, not three — and its history begins **2023-05-12**, the
venue's own beginning.

Its liquidations are richer than anything a centralised venue publishes: the
**address** that was liquidated, the mark price at the time, whether it was
taken at market or backstopped, and which vault absorbed it.

Neither its open interest nor its liquidations can be backfilled — the venue
reports open interest only as it is *now*, and its fills endpoint caps at 2,000
rows against vaults that trade constantly. So this stream records **forward
only**, and begins when the watcher began.

See [Hyperliquid](/data/hyperliquid).

## Where every stream stops

| stream            | from       | note                                                      |
| ----------------- | ---------- | --------------------------------------------------------- |
| Pool history      | 2021-05-05 | 41 pools, three networks                                  |
| DVOL              | 2021-03-24 | skew is assumed, not measured                             |
| Funding (Binance) | 2019-09    |                                                           |
| Funding (Bybit)   | 2021-01    | kept separate from Binance                                |
| Open interest     | 2021-01-01 | per symbol, still filling; ask the tool for current depth |
| Hyperliquid       | 2023-05-12 | forward only; cannot be backfilled                        |

A tool that cannot cover the window you asked for says so. None of them fills a
gap with a zero.


## Related topics

- [Your account and your keys](/kernel.md)
- [Using a Safe wallet](/safe.md)
- [How a run works](/platform.md)
- [Words we use](/concepts.md)
- [FAQ](/faq.md)