{"uid":"cap_Pxd7hDG-kxEJ9L4MdlrNC","slug":"powahub-coin-valuation-9d0087c7","name":"PowaHub Coin Valuation","description":"Provides market value prices for numismatic coins.","url":"https://api.powahub.ai/b06c5e0be3b344409b7829997f6e3be9-cd/coin-valuation/valuation?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["denomination"],"properties":{"year":{"type":"string","description":"Year as struck, e.g. 1906, 1821."},"grade":{"type":"string","description":"Only sales of this grade count, e.g. very_fine or Very Fine."},"metal":{"type":"string","description":"e.g. Silver, Gold"},"issuer":{"type":"string","description":"Issuing authority as stored, e.g. United Kingdom of Great Britain and Ireland."},"series":{"type":"string","description":"The series, e.g. Britannia."},"slabbed":{"type":"string","description":"true: only coins sold in a grading slab; false: all others. Lower case."},"variant":{"type":"string","description":"A variety or treatment, e.g. Piedfort."},"fineness":{"type":"string","description":"Purity as a decimal, e.g. 0.925 (0.9250 matches too)."},"mint_mark":{"type":"string","description":"The mint mark as struck, e.g. S, SA. Leave out if none or unknown."},"weight_oz":{"type":"string","description":"Fine metal content in troy ounces, e.g. 1 for a 1 oz bullion coin. Bullion coins only."},"window_to":{"type":"string","description":"Only sales up to this date, YYYY-MM-DD."},"strike_type":{"type":"string","description":"How it was struck: business, proof, reverse_proof, matte_proof, specimen, brilliant_uncirculated or bullion (the label works too, e.g. Proof)."},"window_from":{"type":"string","description":"Only sales from this date, YYYY-MM-DD. Not with window_sales."},"denomination":{"type":"string","description":"The coin's denomination, e.g. Florin, Crown."},"window_sales":{"type":"string","description":"Number of most recent sales to use, 1–500 (integer). Not with a date range."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0051","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.0051/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0051","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0051","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_2Di2xS0d_nHzKV7xlWMpx","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0051","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns market value prices for numismatic coins based on recent sales data, filtered by denomination, year, grade, metal, strike type, and other attributes.","exampleAgentPrompt":"What's the current market value of a 1906 Silver Florin in Very Fine grade from the United Kingdom — use the last 100 sales to calculate the price?","exampleUseCases":[{"title":"Valuing a graded proof sovereign","prompt":"Can you look up the market value of a 1937 Gold Proof Sovereign issued by the United Kingdom, using all sales from the last 12 months — so from 2024-06-01 to 2025-06-01?"},{"title":"Pricing a slabbed bullion coin","prompt":"What's the going price for a slabbed 1oz Gold Britannia bullion coin with fineness 0.9999, based on the most recent 50 sales?"},{"title":"Researching a mint-marked Morgan Dollar","prompt":"Get me the numismatic valuation for a Morgan Silver Dollar with an S mint mark, struck in business strike, in Very Fine grade, using all sales from 2023-01-01 to 2025-01-01."}],"resultDescription":"Returns market valuation data for the specified numismatic coin, including price estimates derived from recent sales records, filtered by the provided attributes such as grade, strike type, date range, or number of recent sales.","failureModes":["Missing required 'denomination' parameter returns a validation error","No sales data found for the specified filters returns an empty or null result","Invalid grade or strike_type string may return no matching results","Conflicting parameters (window_from with window_sales) likely returns an error","Invalid date format for window_from or window_to causes a bad request error"],"whenToPreferThis":"Use this endpoint when you need real market value prices for collectible or numismatic coins and can specify at least the denomination. Prefer this over generic precious-metal spot price APIs when the user cares about numismatic (collector) value rather than raw metal content, or when coin grade, strike type, or issuer matter to the valuation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T13:08:23.733Z","isFirstParty":false,"canonicalSlug":"powahub-coin-valuation-9d0087c7"}