Credits

Olea is a web page. Almost everything it stands on was made by someone else, and here they are.

The photograph

The picture behind every page is Single olive by Relativity, used under CC BY-SA 4.0 and reached through Wikimedia Commons: commons.wikimedia.org/wiki/File:Single_olive.jpg. We changed it, and that is what the licence asks us to say. It is shared under the same licence.

It is one ripe olive on the tree. The mark is that olive, so the logo and the picture belong to each other. What ships is softened and toned, never the original file: Scaled to 1920×1280, softened with a 12px blur, saturation ×1.15, and lifted with a gamma of 1.6: the photograph is a dark one, and a gamma lifts the leaves and shadows without blowing out the sky the way a brightness multiply does. Done in Chrome's own canvas by tools/make-ground.mjs, because this machine has no image library.

4 other photographs were downloaded and measured before this one was chosen. Their provenance, recorded when each was downloaded, is in data/photo-candidates.json.

The typefaces

  • Bodoni Moda by Owen Earl (indestructible type*), for headings — SIL Open Font License 1.1.
  • Albert Sans by Andreas Rasmussen, for everything else — SIL Open Font License 1.1.
  • Red Hat Mono by MCKL for Red Hat, for addresses and figures — SIL Open Font License 1.1.

Served from Google Fonts. The logo files in the brand kit embed the letters they use, so they look the same where the fonts are not installed.

The contracts

Olea deploys nothing. It builds calls to contracts other people wrote and deployed:

  • Valorem Options Clearinghouse — 0x9a7b…C0C0. Written by Valorem Labs (BUSL-1.1 as published) and deployed on this chain by an address that is not ours, on Sep 10.
  • Seaport 1.6 — 0x0000…B395. Written by OpenSea (MIT), and deployed here by somebody else before Olea existed.
  • Robinhood's price feeds — one per listed stock, found through Morpho's markets. Read only.
  • Multicall3 — 0xcA11…CA11, for reading many things at one block.
  • The stocks and the dollar — tokenized shares issued on Robinhood Chain, and Global Dollar (USDG) issued by Paxos. Neither is ours, and listing one is not an endorsement.

The code

  • ethers.js v6 (MIT) — encoding and decoding, in the page and in the tools.
  • Hardhat (MIT) — the local fork the time-dependent checks and the browser runs use.
  • solc 0.8.26 (GPL-3.0) — compiles the property harness, which is never deployed.
  • The fair-price estimate is the Black–Scholes formula (1973), with the normal distribution from Abramowitz & Stegun 7.1.26.
  • The story of Thales and the olive presses is from Aristotle's Politics, book I, chapter 11, retold in our words.