FREE FX Rates by Sera.CX

Marketing + landing site for Sera FX — the free, real-time FX rates API. Live at fx.sera.cx, hosted on GitHub Pages.

Real-time buy, sell and mid-market rates across 160+ currencies, updated every 60 seconds. Free forever — no credit card, no paid tier, commercial use allowed. Powered by Sera's on-chain FX settlement engine. API at api.sera.cx/v1, docs at docs.sera.cx.

Structure

• index.html — the single-page site (self-contained: inline CSS/JS, Google Fonts).
• dashboard/ — "Connect with Privy → mint key" page (preview: simulated auth; wire real Privy).
• worker/ — the rates layer (Cloudflare Worker): CORS-enabled /quote /latest /convert, simulated today, adapter seam for Sera's orderbook mid (worker/src/sera.js).
• mcp/ — MCP server exposing get_rate / convert / settle to AI agents (calls the worker).
• 404.html — branded not-found page.
• assets/ — sera-mark.png (nav/footer logo), og.png (social share card), wordmarks.
• favicon.*, apple-icon-180x180.png — the Sera S favicon set.
• robots.txt — allows search engines and AI answer-engine crawlers (GEO).
• llms.txt / llms-full.txt — machine-readable summaries for LLMs.
• sitemap.xml — search-engine sitemap.
• CNAME — custom domain (fx.sera.cx).

SEO / GEO baked in

Full Open Graph + Twitter Card tags, canonical URL, and JSON-LD structured data (Organization, WebSite, WebAPI, FAQPage) so the site ranks in search and gets cited by ChatGPT, Claude, Perplexity and Gemini.

Planning docs

• PLANNING.md — strategy, SEO architecture, audience funnels.
• SPEC.md — implementation spec, data model, CI.
• GROWTH.md — distribution loops, GEO domination, GTM.

Notes

• The homepage converter/ticker use illustrative simulated rates (feature-flagged via LIVE_RATES_ENABLED in index.html). The marketed api.sera.cx/v1/quote rates API does not exist yet: the real core API is a signed on-chain orderbook at api.sera.cx/api/v1 (EIP-712 auth, no public price endpoint, no CORS). To go live, build a server-side rates layer that computes buy/mid/sell from the orderbook mid and serves them CORS-enabled, then flip the flag and point API_BASE at it. See openapi.yaml for the target contract.
• Deploy: pushing to main publishes to GitHub Pages. Set DNS fx CNAME sera-cx.github.io and enable "Enforce HTTPS" once the certificate provisions.