# 80% Silver Melt Calculator

> Live junk silver and gold melt value calculator: spot price, coins, sterling. USD/CAD.

- name: com.80percentsilver/silver-melt
- version: 1.0.0
- connection class: R0 (autonomous)
- trust: 79/100 flags: no-repository
- quality: 79/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.80percentsilver%2Fsilver-melt
- tools: https://api.protogrid.dev/v1/servers/com.80percentsilver%2Fsilver-melt/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "silver-melt": {
      "type": "http",
      "url": "https://80percentsilver.com/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 99
- freshness: 85
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-97% ~updated-36d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 79/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: calculate_melt_value (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_spot_price (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); calculate_coin_melt (readOnlyHint, destructiveHint, idempotentHint, openWorldHint)
- pass `tools.token_cost`: about 799 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 3, about 799 tokens to load them all
- tool set hash: 2a51ab1bc4b9841fcb14d353fc34f206
- badge: [![protogrid quality](https://protogrid.dev/badge/com.80percentsilver/silver-melt.svg)](https://protogrid.dev/servers/com.80percentsilver/silver-melt)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://80percentsilver.com/mcp (streamable-http, auth none, reachable true, uptime30d 0.9741379)

## Packages

_none_

## Tools (3)

- `calculate_coin_melt`: Calculate the melt value of junk silver coins (constitutional silver) at the current silver spot price: US 90% pre-1965 dimes/quarters/halves/dollars, US 40% Kennedy halves (1965–1970), US 35% war nickels (1942–1945), Canadian 80% (1920–1966/67) and Canadian 50% (1967–68) coins. Provide the coin type plus either a quantity of coins or a total face value (e.g. face_value 2.50 for a roll of dimes). Returns total actual silver weight (ASW) in troy oz and grams, and melt value in USD and CAD.
- `calculate_melt_value`: Calculate the melt value (intrinsic bullion value) of silver or gold from weight and purity — e.g. sterling silver flatware, .999 rounds, scrap gold. Returns melt value in both USD and CAD plus the fine metal weight. Purity is a fraction: 0.925 = sterling, 0.999 = fine silver, 0.9 = US coin silver. Weight units: g (grams), ozt (troy ounces), oz (avoirdupois ounces — postal-scale ounces).
- `get_spot_price`: Get the current spot price of silver and gold in USD and CAD per troy ounce. Use this to answer questions about the silver spot price, gold spot price, or the USD→CAD exchange rate used for melt value calculations. Prices are live, cached up to 15 minutes. All prices are per troy ounce (ozt).