What's new on Arithmos

We ship a Model Context Protocol server with OAuth 2.1 sign-in, so you can give your favourite AI agent live access to build, backtest, and query your indices. Tool annotations, scopes, and a public submission console are included.

• OAuth 2.1 with scoped consent
• Streaming tool calls for long-running index builds
• Public submission console at /admin/mcp for app-store readiness

Compare any two of your indices on a Sharpe ratio chart, switch between rolling windows, and let the optimiser propose the weights that would have produced the best risk-adjusted return over your chosen window.

GPT-5 is now a fully supported LLM for index generation, alongside the Anthropic and OpenRouter options. Picks up from your provider settings automatically.

Every /locations page now renders a proper geographic atlas of the relevant exchange and major issuers, so you can see the geography behind an index at a glance. APAC tickers (Tokyo, Singapore, Hong Kong, Seoul) now resolve correctly across the platform.

Not sure where to start? The new wizard walks you through theme, geography, and weighting in three steps and hands you back to the prompt box pre-filled with a working brief.

/pricing now offers a third tier with bring-your-own-data feeds, dedicated support, and SLA-backed uptime. Self-serve through Stripe; talk to us through /contact for custom terms.

Founding Frontend Engineer, Data/Quant Engineer, and Head of Custom Index Solutions are live on /vacancies, with a filter UI and richer JobPosting schema so the listings show up properly on Google for Jobs.

The animated headline on the home page no longer glitches when the tab loses focus.

Two new SEO-friendly hubs: /locations indexes everything by geography, /compare lets you pit any two indices against each other on returns, drawdown, sector tilt, and overlap.

A new shortcut on the home page that picks a randomised but plausible prompt and runs it. Good for inspiration, good for stress-testing the agent.

A plain-English walkthrough of how the prompt → portfolio → backtest pipeline works, with structured data so it shows up properly in search.

Cards on the home gallery render faster, the trust bar makes the data sources explicit, and the Arithmos mark now sits above the wordmark for a sharper visual identity.

Chart ranges now respect the period you picked, and the underlying data refresh is much more reliable.

Choose between Anthropic, OpenRouter, and OpenAI for index generation. Switch in /admin/providers; spend tracking and rate limits handled per provider.

Sign in with a magic link — no password to remember, no password to leak. New onboarding step asks for a display name so your indices show up under something more meaningful than your email prefix.

Every index card on the home page now shows a small price sparkline, so you can scan performance at a glance.

A clean link-in-bio page at /links with an animated wordmark and a curated set of CTAs. Great for posting from social profiles. Click-through tracking included so we can see what's working.

Visit /brand for an on-brand backdrop and downloadable social assets — square avatars, OG cards, and the wordmark in a few colour treatments.

Terms acceptance now lives on a friendlier post-verify welcome step. The whole onboarding sequence has been retightened, and the brand presentation has been cleaned up across the funnel.

Copy across the site now consistently positions Arithmos as an investment research and data tool — not investment advice and not a regulated broker. A clear terms gate sits at the top of the funnel.

We've published 84 curated, official Arithmos indices spanning sectors, themes, geographies, and factor styles. Browse them on the home gallery; clone any one of them as a starting point for your own.

Subscribe to /feed.xml to get every new index — yours, official, and public — straight into your reader. AI crawlers (Claude, ChatGPT, Perplexity, Gemini, Bing) are now explicitly allowed on our public surface.

Published explainers on building your own index, prompt-to-portfolio, custom index vs ETF, and the best alternatives to the S&P 500. All linked from /blog.

Your in-progress prompt now survives a refresh, an accidental tab close, or a sign-in detour. No more retyping.

Yearly Plus and Pro plans can now be paid with crypto via Stripe. Same checkout, same entitlement, optionally settled on-chain.

These pages no longer require sign-in, so anyone can preview pricing, browse markets, and grab brand assets without an account.

Index runs now use a durable workflow runner under the hood. If a step takes a long time or the platform restarts mid-run, your index resumes cleanly instead of failing silently.

Crypto invoices now render the manual payment instructions correctly, the data-fabric cards no longer ship with broken links, and sortable tables are correctly locked for guest viewers.

Pricing now offers the cashflow of monthly billing with the savings of an annual commitment. Stripe and the dashboard show both numbers clearly.

The build button is now visually neutral so it doesn't feel like the only thing on the page, and signed-out visitors get a sign-up shortcut top-right.

A pass on denormalisation, caching, and static rendering cut payload weight dramatically across the home gallery, profile pages, and shared index pages. Everything just feels snappier.

Indices that are still building, or that failed mid-run, now render an informative state instead of a blank page. Stuck pendings auto-fail after a sensible timeout.