# PowaHub Coin Valuation

> PowaHub Coin Valuation is a paid API for AI agents from api.powahub.ai, paid per call via x402, $0.0051/call, status unknown (last checked 2026-10-29).

Returns market value prices for numismatic coins based on recent sales data, filtered by denomination, year, grade, metal, strike type, and other attributes.

## Facts

- Endpoint: GET https://api.powahub.ai/b06c5e0be3b344409b7829997f6e3be9-cd/coin-valuation/valuation?utm_source=zero.xyz
- Price: $0.0051/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/powahub-coin-valuation-9d0087c7
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Pxd7hDG-kxEJ9L4MdlrNC

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability powahub-coin-valuation-9d0087c7
```

Example prompt: 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?

## When to prefer this

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.

## Known failure modes

- 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

## How this service works

Provides market value prices for numismatic coins.

## Output

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.

## Request schema (JSON Schema)

```json
{
 "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",
       "descriptio
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/powahub-coin-valuation-9d0087c7/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.powahub.ai](https://www.zero.xyz/host/api.powahub.ai/llms.txt)