ccusage-core

The runtime every adapter and the binary share: pricing, cost calculation, report shaping, table output, and the date and progress helpers. Configuration lives in ccusage-config and the billing-block report in the binary, because neither has a consumer outside it.

Owns

• pricing.rs — the PricingMap, the embedded models.dev and LiteLLM snapshots, the built-in rate tables, and the optional runtime fetch. models.dev repeats every model once per catalog that serves it, so models-dev-catalog-rules.json carries what a live api.json response does not say: which catalogs author models, which only resell them, which model ids and tiers the authored catalog carries, and which models are priced per asset rather than per token. Both the snapshot and the runtime fetch apply it, so they cannot disagree about where a rate came from or which ids the fuzzy lookup may answer with.
• cost.rs — cost calculation and missing-pricing detection.
• summary.rs, agent_report.rs, output.rs — row aggregation, period labels, JSON shaping, and table rendering.
• date_utils.rs, fast.rs, home.rs, path_utils.rs, utils.rs — timestamp parsing, byte-level line scanning, and small shared helpers.
• progress.rs — the load progress indicator.
• types.rs, CliError, and the Result alias every crate returns.

build.rs compacts the pinned LiteLLM snapshot into the binary. It reads CCUSAGE_PRICING_JSON_PATH, which every Nix build and the dev shell set; the fetch-litellm-pricing feature adds the HTTPS download that plain cargo build needs on platforms Nix cannot target. Every embedded snapshot is minified and deflated on the way in — the committed files stay indented for reviewable regeneration diffs, and at 2K+ models the models.dev JSON alone would otherwise add a quarter megabyte to the binary. The runtime inflates each snapshot once, on first use.

Depends on

• ccusage-cli
• ccusage-terminal
• jiff
• memchr
• rustc-hash
• serde
• serde_json
• smallvec
• ureq

Build layer

Built in the foundation Crane artifact layer, so a change here recompiles every adapter.