Every change Wellknown observed on this MCP server, newest first, with what it was before and what it became. Tool-surface changes carry the definition diff. Nothing here is edited after the fact.
Certificate recorded, valid to 2027-01-13
Authorization not required
Added "bullion_sales_tax" (14 tools before, 15 now)
State sales tax on bullion — Is a gold, silver, platinum or palladium purchase subject to state sales tax in a US state or DC? Give a 2-letter state code (or the state name) and optionally the metal, product_type (coin or bar) and the purchase amount in USD to apply the state's threshold. Returns the state's status (exempt, partial, taxable or no_sales_tax), a plain-English explanation, the threshold logic, the official source URL and the last_reviewed date, from the same table as the Bullion Price Check sales tax guide. General information, not tax advice. GET /api/v1/sales-tax lists all 51.
Added "benchmark_premium", "product_spec", "quote" and 1 more (10 tools before, 14 now)
Premium benchmark vs the US market — Benchmark your asking price (or premium %) for one tracked product against today's listed US dealer asks: your premium over spot, the market 25th percentile, median and 75th percentile premium, your percentile rank, and the Bullion Premium Index row (CC BY 4.0) with its dealer count. Aggregates only: no dealer is named.
Coin and bar spec lookup — Official specs for a coin or bar: mint, country, fineness, gross and fine weight, pure metal content, denomination and series, with the source for each row and a fine-weight recompute check (gross x purity / 31.1034768). Covers the tracked products plus spec-only coins (pre-1933 $20/$10/$5 gold, Morgan and Peace dollars, PAMP 20 g and 10 g bars). Unknown fields, IRA eligibility and 1099-B reportability come back null and are listed in missing; nothing is estimated.
Dealer buy/sell quote from spot — Price a dealer ticket from spot. Two classes: bullion (a tracked product) and scrap (weight + unit + karat or purity; purity is applied once). Buy offers use labeled default tiers as % of melt (bullion: conservative 96, target 97.5, aggressive 98.5; scrap: 90, 93, 95) or your own offer_pct; sell quotes use your margin rule: melt x (1 + margin_pct/100) + margin_usd. Returns unit and total (totals rounded once, from the unrounded unit), expiry, the spot used (spot_source, spot_asof), sell-side market percentiles and, for bullion buy offers, published dealer buyback bids as an anonymous benchmar…
Unknown → Live
First tool surface recorded: 10 tools (server version 1.0.0)
https://bullionpricecheck.com/mcp (mcp_streamable_http) — from mcp_registry, with the record
Showing the latest 7 events. The API returns up to 500 and filters by kind: ?kind=tool_surface_changed
Inventory valuation — Value a list of inventory lots of tracked products at melt (spot x metal content) and at today's median listed US dealer ask, with cost basis and unrealized gain against melt when you give it. Up to 50 lots. On REST pass lots as JSON or as sku:qty[:cost_basis] items joined by commas.