dsh-token-usage

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Turn every real token spend into a bill priced at the official peak/off-peak rates.
Summary cards + GitHub-style heatmap · real token cost estimates · auto-converted official prices

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🎯 What it is

dsh-token-usage is a token-usage statistics plugin for DeepSeek Harness (dsh). It adds a Usage Stats page to the Web settings panel: summary cards (total tokens / daily average / cache hit rate / estimated spend, switchable in one click between today / this week / this month) plus a 3-month GitHub-style heatmap — quantifying your real token consumption from past sessions and, crucially, converting it automatically to what it actually costs you at the official peak/off-peak prices (shown in CNY and USD side by side).

It's not a reskin of a native page — it shows your budget from the level that matters: which model is burning money, which hours are the most expensive, and how much the cache-hit rate saves you — all visible at a glance and priced precisely against the official rates.

Native dsh web	With this plugin
No token-usage stats entry	Settings → Usage Stats: summary cards + 3-month heatmap
No spend estimates	Real tokens × official peak/off-peak prices → estimated CNY & USD
No price management	Per-model price table: CNY / USD × peak / off-peak, edit inline
Hard-coded prices	Official defaults built in; ark-code-latest and other aliases auto-mapped

All data comes from the usage field carried by assistant/message events in persisted session logs — the plugin is a pure observer: it never touches the agent loop and never reports anything to an external service. Everything stays on your machine.

📸 Screenshots

⭐ Features

📊 Summary cards

Four cards at the top: total tokens, daily average, average cache hit rate, and estimated spend (CNY & USD together). Click to switch instantly between today / this week / this month (pure client state, no extra requests).

🗓️ 3-month heatmap

A GitHub-contribution-style horizontal week strip: one column per week, one row per weekday, with month boundaries annotated. Hover any day's cell to see that day's total tokens, input (cache miss), input (cache hit), output, cache hit rate, and spend (CNY / USD) — which day spiked, how much of the budget a week consumed, all at a glance.

💰 Model price table

Lists per-model prices for every connected model (from the ctx.llm model catalog), in CNY and USD, each split into peak / off-peak tiers for display and editing; ships official tiered defaults for deepseek-v4-flash and deepseek-v4-pro.

✏️ Price editing

Switch the table's currency and period (peak / off-peak), edit prices inline, hit "Save prices" to persist — stats refresh instantly with the new prices (no restart).

🕘 Precise time-of-day billing

Every call's spend is resolved from its own event timestamp — calls during Beijing peak hours (09:00–12:00, 14:00–18:00) are billed at the peak tier, all others at the off-peak tier (half of peak). Billing lands automatically all day, no manual tier picking.

🧊 Pure observer · zero interference

Never modifies the agent loop, never uploads to any external service; the index is incremental and memory-bounded, answering hot requests in tens of milliseconds — install and forget it in the background.

⚙️ How it works

• Single endpoint + incremental index: the server maintains a day × peak/off-peak × model incremental persistent index; hot requests against the ready in-memory index answer in tens of ms, and a session log whose mtime changed is re-read individually and merged incrementally.
• Disk reconciliation: the index is periodically written atomically (temp file + rename) to $DSH_HOME/dsh-token-usage/index.json, restored from disk on restart with near-zero rescan, and memory is bounded to the 3-month stats window plus 45 days of slack. A 30s whole-page response cache covers the rest.

🚀 Install

This plugin installs directly into the native Web profile of DeepSeek Harness (web is a built-in profile shipped with the distribution; dsh web is a hardcoded alias for --profile web). Once installed, no profile flag is needed at launch — run pnpm dsh web from the harness checkout and the plugin is loaded.

npm (prebuilt · zero permissions · recommended)

dsh plugin --profile web add dsh-token-usage

GitHub direct install (source + prepare self-build, allowlisted once)

dsh plugin --profile web add github:Tastelessor/dsh-usage-stats#<commit-sha>
# If the first add fails, add the package key pnpm printed to the web
# profile's pnpm-workspace.yaml:
#   $DSH_HOME/profiles/web/pnpm-workspace.yaml
#   allowBuilds:
#     dsh-token-usage: true
# then re-add.

Local path

dsh plugin --profile web add /path/to/dsh-token-usage

dsh plugin add ./ uses a pnpm link and does not run prepare — run pnpm build first, then add.

Launch

pnpm dsh web        # from the DeepSeek Harness checkout; web is the built-in profile, no --profile

🛠️ Configuration

Price table

Override in the web profile's cordis.patch.yml ($DSH_HOME/profiles/web/cordis.patch.yml, or via a --patch overlay); the two currencies are configured independently, each model entry holds a peak / offPeak pair, and unset entries fall back to the built-in defaults:

- patch:
    - id: dsh-token-usage
      config:
        currency: CNY        # preferred currency: CNY (default, ¥) / USD ($)
        models:
          deepseek-v4-flash:
            cny:             # CNY prices (¥ / 1M tokens)
              peak:          # Beijing 09:00–12:00, 14:00–18:00
                inputPerM: 3.0         # input, cache miss
                cacheReadPerM: 0.10    # input, cache hit
                outputPerM: 9.0       # output
                cacheWritePerM: 0      # not billed by the official v4 pricing
              offPeak:       # all other hours (half of peak)
                inputPerM: 1.5
                cacheReadPerM: 0.05
                outputPerM: 4.5
                cacheWritePerM: 0
            usd:             # USD prices ($ / 1M tokens)
              peak:
                inputPerM: 0.44
                cacheReadPerM: 0.014
                outputPerM: 1.32
                cacheWritePerM: 0
              offPeak:
                inputPerM: 0.22
                cacheReadPerM: 0.007
                outputPerM: 0.66
                cacheWritePerM: 0

Legacy flat entries (a bare inputPerM / cacheReadPerM / outputPerM / cacheWritePerM block, as in pre-2026-08-17 configs) still parse and are treated as "the same price at all hours" — both tiers equal.

The built-in defaults (src/host/config.ts) match the official prices below; the in-page "Save prices" button writes exactly the models.<id>.cny|usd shape shown here (both tiers) — no manual config editing needed.

Model id aliases

Prices and spend match model ids exactly. ARK's coding endpoints advertise their model under ids like ark-code-latest (whose physical model changes over time; today it is DeepSeek V4 Flash — both the catalog and every usage event carry the alias id, so without a mapping the built-in deepseek-v4-flash price never matches). The plugin ships ark-code-latest → deepseek-v4-flash by default and lets you override/extend via aliases:

- patch:
    - id: dsh-token-usage
      config:
        aliases:
          ark-code-latest: deepseek-v4-flash   # built-in; point it at the physical model
          my-other-alias: deepseek-v4-pro

📋 Official prices (verified against api-docs.deepseek.com, 2026-08-18)

DeepSeek bills time-of-day tiers since 2026-08-17: peak hours are Beijing time 09:00–12:00 and 14:00–18:00; off-peak is half of peak (¥ / $ per 1M tokens, cache hit / miss / output):

Model	Off-peak CNY	Peak CNY	Off-peak USD	Peak USD
deepseek-v4-flash	0.05 / 1.5 / 4.5	0.10 / 3.0 / 9.0	$0.007 / $0.22 / $0.66	$0.014 / $0.44 / $1.32
deepseek-v4-pro	0.15 / 4.5 / 13.5	0.30 / 9.0 / 27.0	$0.022 / $0.66 / $1.98	$0.044 / $1.32 / $3.96

Spend estimation resolves each usage event's own timestamp against these windows (Beijing time, UTC+8 — independent of the host's timezone), so peak-hour and off-peak calls land on their correct rates automatically.

Implementation note: dsh's web settings API (settings.mutate) only exposes a hardcoded allowlist of host namespaces — external plugin namespaces are rejected (settings-not-exposed) — so price write-back goes through the plugin's own POST /dsh-token-usage/prices route, which calls ctx.settings in-process (exactly equivalent to hand-editing the config).

⚠️ Known limitations / disclaimer

• Amounts are estimates (built-in price table × the four real token buckets), not provider invoices; prices are subject to change — always check the official pricing page.
• Spend is estimated in CNY and USD simultaneously; the two currencies have independent price tables.
• A 30s response cache means an estimate around a peak-window boundary (09:00 / 12:00 / 14:00 / 18:00 Beijing time) can lag the tier switch by at most 30 seconds.
• reasoningTokens is a subset of output tokens and is never counted twice.
• Models with no price configured in either currency: tokens are still counted, spend is not, and the page shows "Not configured".
• The index is incremental and memory-bounded (3-month stats window + 45 days of slack), so hot requests run in tens of ms; building the index for the very first time on a huge data volume can still take a while, after which the incremental index plus the 30s response cache keep subsequent requests fast.

🔧 Development

pnpm install     # install deps (peers are provided by the dsh profile at runtime)
pnpm test        # vitest, 85 tests
pnpm typecheck   # tsc --noEmit
pnpm build       # tsdown build into lib/

📄 License

MIT