List all shipping lines in the ShippingRates database with per-country record counts.
Use this to discover which carriers and countries have data before querying specific tools. Returns each carrier's name, slug, SCAC code, and a breakdown of available D&D tariff and local charge records per country.
FREE — no payment required.
Returns: Array of { line, slug, scac, countries: [{ code, name, dd_records, lc_records }] }
Related tools: Use shippingrates_stats for aggregate totals, shippingrates_search for keyword-based discovery.
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