Seek Peak

A zero-dependency static page that tells you whether the DeepSeek API is currently billed at peak (2×) or off-peak rates — in your own timezone.

Built as a single self-contained index.html that works from a double-click (file://), a simple static host, or python -m http.server — no backend, no build at runtime, no JavaScript frameworks.

What it shows

• Verdict badge — "PEAK TIME" / "OFF-PEAK TIME" for right now, with a countdown to the next transition.
• Pricing table — per-model prices for input (cache hit / cache miss) and output tokens, with the currently-applied rate highlighted.
• Daily timeline — minute-precision peak blocks projected onto your local clock, DST-correct.
• Timezone picker — auto-detected, user-selectable. The verdict is always computed on UTC; your timezone only changes which clocks you read.
• 8 color themes (5 dark + 3 light) — persisted in localStorage, applied without flash.
• Info dialog ("?") — a short explanation of how the page works and why it exists.
• Footer — cross-links plus an icon-only link to the source repo on GitHub; present on every page.
• SEO / metadata — canonical URL, Open Graph + Twitter cards with a generated OG image, JSON-LD (WebSite / FAQPage / speakable), and a minimal robots.txt.

How it works

The verdict is computed on UTC now, so it is identical for every visitor at any instant. Peak windows are half-open UTC intervals (01:00–04:00 and 06:00–10:00): 06:00:00.000 is peak, 10:00:00.000 is off-peak — on weekdays. Weekends are always off-peak: Saturday and Sunday in Beijing time (Asia/Shanghai, fixed UTC+8) override the UTC windows above, all day, regardless of the visitor's own timezone (see docs/ADR-004). Chinese public holidays are also always off-peak, by the same Beijing-anchored override (see docs/ADR-005). Per-timezone blocks are derived at runtime via Intl (DST-correct) — never hardcoded. Configuration (windows + prices + weekend rule + holiday dates) lives in config.json, the single source of truth.

See DESIGN.md for the full design, and docs/ADR-*.md + docs/GLOSSARY.md for the committed domain-model decisions.

Referral sub-page

Alongside the verdict page, the build emits one static sub-page to dist/<slug>/index.html:

Slug	Page
free-credits	Hand-checked list of provider sign-up credits

It's <slug>.template.html with /*__CSS__*/ and /*__SUB_APP__*/ placeholders, a @source line in src/style.css, a watch target in scripts/build.mjs, and an assertion block in scripts/verify.cjs. It uses a small bundle (src/subpage.js, theme picker only) and the theme list from src/themes.js. The homepage footer links to /free-credits/ (no prominent CTA block — kept low-key since some providers have had issues).

The free-credits offers are not hand-written in the template. credits.json at the repo root is the single source of truth — one object per offer (provider, credits, creditsShort, url, featured, stars 1–5, models, optional blurb/note). scripts/build.mjs (via scripts/credits.mjs) renders the offer cards, the page's FAQ JSON-LD, and regenerates free-credits.gist.md — a standalone Markdown copy for posting as a GitHub Gist (not part of dist/). Edit credits.json and run npm run build.

featured: true gives a card the pink/yellow treatment (currently B.Ai); stars renders as ★/☆ behind the provider name on the CTA button.

verify.cjs checks the offers loosely on purpose: every provider in credits.json, and each of its models, must appear on the built page and in the gist. Copy, styling and star counts are left to the renderer — adding or editing an offer is just a credits.json change plus npm run build.

Status API

Alongside the static page, api/ holds a small read-only JSON API (PHP, Symfony skeleton) deployed independently to api.seekpeak.dev:

https://api.seekpeak.dev/v1/status?tz=Europe/Berlin

tz is an optional IANA timezone name, case-sensitive; backward-compatible aliases such as Asia/Calcutta are accepted (defaults to UTC; an unrecognized value returns 400). Response, e.g. on Thursday 2026-01-08 at 07:00 UTC:

{
  "tz": "Europe/Berlin",
  "utcTime": "2026-01-08T07:00:00.000Z",
  "localTime": "2026-01-08T08:00:00+01:00",
  "peak": true,
  "reason": "window",
  "nextTransition": { "at": "2026-01-08T10:00:00.000Z", "peak": false },
  "models": [
    {
      "id": "deepseek-flash",
      "name": "deepseek-flash",
      "cacheHit": { "offPeak": 0.003, "peak": 0.006 },
      "cacheMiss": { "offPeak": 0.15, "peak": 0.3 },
      "output": { "offPeak": 0.6, "peak": 1.2 }
    }
  ]
}

models is the same per-1M-token price table (cacheHit/cacheMiss/output, each with offPeak/peak rates) the static page's pricing table renders — included so a consumer gets the verdict and the full rate table in one call.

The API reads the same repo-root config.json the static site does (copied into api/config.json by a composer script on install — never hand-edited) and does not replace the site's client-side computation; the static page keeps working offline exactly as before.

Build

npm run build                 # compile + minify + inline Tailwind CSS, config, app.js
npm run build && node scripts/verify.cjs   # build + run the test suite
npm run watch                 # rebuild on change

Output: dist/index.html, one dist/<slug>/index.html per referral sub-page, plus dist/og-image.png (copied verbatim from assets/og-image.png — author it yourself, 1200×630 recommended), dist/site.webmanifest and dist/robots.txt. The inlined JS is minified with terser. The test harness (scripts/verify.cjs) parses the built artifacts and covers verdict logic (a 9-UTC-day sweep spanning Beijing weekends, checked against an independent Intl-weekday reference), the Chinese-holiday override, half-open boundaries, countdown text, DST-transition midnights, cross-midnight timelines, and static template / SEO / dist-file expectations.

The site URL lives in the site block of config.json and flows through the build into the head (canonical, og:*, JSON-LD) — never hardcode the domain in index.template.html.

Configuration

config.json is the single source of truth:

{
  "peakWindows": [["01:00", "04:00"], ["06:00", "10:00"]],  // half-open UTC, weekdays only
  "weekendOffPeak": { "timezone": "Asia/Shanghai", "days": [0, 6] },  // Sat+Sun, Beijing-anchored
  "chinaPublicHolidays": { "timezone": "Asia/Shanghai", "dates": ["2026-01-01", /* … */] },  // Beijing-anchored, updated yearly
  "models": [
    { "id": "deepseek-flash", "cacheHit": { "offPeak": 0.003, "peak": 0.006 }, /* … */ },
    { "id": "deepseek-v4-pro", /* … */ }  // optional per-model "note" string renders under the model id, unused for Pro since DeepSeek confirmed it continues past Sep 14, 2026
  ],
  "site": {
    "url": "https://seekpeak.dev",   // feeds canonical/og:/JSON-LD at build
    "name": "Seek Peak"
  }
}

Project layout

Path	Purpose
index.template.html	Single-page layout + placeholders for CSS, config, app
<slug>.template.html	Referral sub-page (free-credits) — CSS + sub-app placeholders
credits.json	Single source of truth for the free-credits offers (provider, credits, url, featured, stars, models)
scripts/credits.mjs	Renders credits.json into the offer cards, FAQ JSON-LD, and the gist
free-credits.gist.md	Standalone Markdown copy of the free-credits page for a GitHub Gist — generated by the build, not built into dist/
src/app.js	All logic (pure, testable helpers + thin DOM renderers)
src/subpage.js	Shared sub-page bundle (theme picker only)
src/themes.js	Theme list — single source of truth, prepended to every page bundle
src/style.css	Tailwind v4 source: theme tokens + [data-theme=…] blocks + @source lines
config.json	Peak windows, weekend off-peak rule, Chinese public holiday dates, model prices, + site block
scripts/build.mjs	Build pipeline (Tailwind v4 → minified CSS, then inline + dist assets)
assets/og-image.png	Your Open Graph image (1200×630 recommended), copied to dist/og-image.png
scripts/verify.cjs	Test suite against the built dist/index.html
DESIGN.md	Domain model, architecture, build pipeline, theme system, verification strategy
docs/	ADRs, glossary, and superpowers spec/plan notes

Not affiliated

This page is not related to deepseek.com.