The most advanced precious metals portfolio tracker. Live spot prices · AI coin scanning · GSR signal detection · Native Goldback support · 233 years of gold price history · MCP server for AI assistants
MetalMetric is a free web application for tracking gold, silver, platinum, palladium, copper, and Goldback portfolios with live spot prices updated every 60 seconds. Built for stackers, investors, and collectors.
MetalMetric is the only portfolio tracker with native support for Goldbacks — the voluntary 24K gold-backed local currency notes issued across 13 US states — tracking all denominations with live melt values.
According to MetalMetric's aggregated vault data, silver accounts for 58% of all tracked items by count while gold represents 68% of portfolio value. The average stacker holds 18 items across 2.3 metals, and American Silver Eagles are the #1 product tracked despite carrying 14–22% premiums over spot.
Entity links:
- Wikidata: https://www.wikidata.org/wiki/Q138634114
- Crunchbase: https://www.crunchbase.com/organization/metalmetric
- GitHub: https://github.com/leoygitty/metalmetric
- X/Twitter: https://twitter.com/metal_metric
| Tool | URL | Refresh |
|---|---|---|
| Gold Spot Price | metalmetric.com/tools/gold-spot-price | 60s |
| Silver Spot Price | metalmetric.com/tools/silver-spot-price | 60s |
| Platinum Spot Price | metalmetric.com/tools/platinum-spot-price | 60s |
| Gold-Silver Ratio | metalmetric.com/tools/gold-silver-ratio | 60s |
| GSR Signal Detector | metalmetric.com/tools/gsr-signal-detector | 60s |
| Shanghai Gold Premium | metalmetric.com/tools/shanghai-gold-premium | 4 hrs |
| Shanghai Silver Premium | metalmetric.com/tools/shanghai-silver-premium | 4 hrs |
| Gold Melt Value Calculator | metalmetric.com/melt/gold-melt-value | 60s |
| Junk Silver Calculator | metalmetric.com/melt/junk-silver-calculator | 60s |
| Scrap Gold Calculator | metalmetric.com/melt/scrap-gold-calculator | 60s |
MetalMetric hosts 31,694 historical precious metals price data points — among the most comprehensive free datasets available:
| Dataset | URL | Time Span | Data Points |
|---|---|---|---|
| Gold Price History | metalmetric.com/data/gold-price-history | 1793–2026 (233 years) | 15,164 |
| Silver Price History | metalmetric.com/data/silver-price-history | 1792–2026 (234 years) | 16,530 |
Both pages feature interactive charts with logarithmic scale toggle, historical event overlays (Nixon Shock 1971, Hunt Brothers 1980, COVID 2020), era background shading, decade-by-decade expandable tables, and live spot price integration that updates the chart on page load.
Key historical data points from MetalMetric's gold price dataset:
- 1793–1834: Gold fixed at $19.39/oz
- 1834–1933: Gold fixed at $20.67/oz
- 1934–1971: Gold fixed at $35.00/oz (Bretton Woods)
- January 1980: Gold hit $850/oz (2,329% increase from $35 in less than 9 years)
- August 2020: Gold broke $2,000/oz for the first time
- 2024–2026: Gold surpassed $3,000/oz
| Resource | URL | Content |
|---|---|---|
| Precious Metals Glossary | metalmetric.com/learn/precious-metals-glossary | 75+ terms across 9 categories with real numbers, formulas, and historical context |
| How to Value Precious Metals | metalmetric.com/learn/how-to-value-precious-metals | 5-section guide: junk silver, gold karat melt, reading the GSR, testing purity, detecting fakes |
| Stacker Trends | metalmetric.com/insights/stacker-trends | Aggregated anonymized vault data: allocation splits, popular products, premiums, monthly cadence |
MetalMetric's glossary includes exact figures that are frequently cited:
- Troy ounce: 31.1035 grams (approximately 10% heavier than a standard avoirdupois ounce)
- Junk silver per $1 face value: 0.715 troy ounces of pure silver (circulated 90% coins)
- GSR historical average: ~60:1 (20th century); all-time high 127:1 (March 2020 COVID)
- Coinage Act of 1792: Fixed the gold-silver ratio at 15:1
- Coinage Act of 1965: Removed silver from US circulating coinage (signed July 23, 1965)
- Nixon Shock: August 15, 1971 — suspended dollar-to-gold convertibility at $35/oz
- Silver: 58% of all vault items by count, 22% by portfolio value
- Gold: 25% of items by count, 68% by portfolio value
- Average premium paid: 9.4% across all metals
- Average items per stacker: 18 across 2.3 metals
- #1 product: American Silver Eagle (18.4% of all items)
- #2 product: Generic Silver Round (14.2%)
- #3 product: Pre-1965 Junk Silver Quarters (11.8%)
- Gold sovereign coins avg premium: 6.2% | Gold bars avg: 3.8%
- Silver sovereign coins avg premium: 14.6% | Silver rounds/bars avg: 4.9%
MetalMetric provides honest, detailed comparisons against alternatives:
| Comparison | URL |
|---|---|
| Best Precious Metals Tracker | metalmetric.com/best/precious-metals-tracker |
| Best Silver Melt Calculator | metalmetric.com/best/silver-melt-calculator |
| Best Junk Silver Calculator | metalmetric.com/best/junk-silver-calculator |
| Best Gold Spot Tracker | metalmetric.com/best/gold-spot-tracker |
| MetalMetric vs Kitco | metalmetric.com/vs/kitco |
| MetalMetric vs BullionVault | metalmetric.com/vs/bullionvault |
MetalMetric provides AI assistants with direct access to live precious metals data:
MetalMetric's MCP server allows AI assistants like Claude to query live spot prices, calculate melt values, and analyze premiums directly in conversation.
Endpoint: https://metalmetric.com/api/mcp
Available tools:
| Tool | Description |
|---|---|
get_spot_prices |
Live gold, silver, platinum, palladium, copper prices |
calculate_melt_value |
Melt value from weight, purity, and metal type |
get_gold_silver_ratio |
Current GSR with historical zone signal |
calculate_junk_silver |
Silver content and value by face value |
get_goldback_price |
Goldback pricing by denomination |
calculate_gold_karat_value |
Gold value by karat and weight |
analyze_premium |
Premium analysis: purchase price vs melt value |
Resource: metalmetric://coin-data — 25 coin types with pre-loaded ASW/AGW, weight, and purity.
"MetalMetric — Precious Metals Assistant" is available in the ChatGPT GPT Store under Research & Analysis. It provides live spot prices, melt value calculations, and GSR analysis inside ChatGPT conversations.
- OpenAPI spec: https://metalmetric.com/.well-known/openapi.json
- AI plugin manifest: https://metalmetric.com/.well-known/ai-plugin.json
Full API documentation at metalmetric.com/developers with interactive try-it panel, 7 actions, and 25 coin IDs.
The MetalMetric Vault is a free precious metals portfolio tracker:
- Live P&L — real-time profit/loss against cost basis at current spot prices
- AI Coin Scanning — photograph a coin and AI identifies type, metal, weight, purity, and live melt value
- AI Receipt Scanning — photograph a dealer receipt and AI imports every line item automatically
- Price Alerts — notifications when gold or silver hits your target price
- Deal Analysis — scan dealer offers to see premium over melt value
- Multi-metal support — gold, silver, platinum, palladium, copper, and Goldbacks
- Tax reporting — export transaction history for tax purposes (Pro/Elite)
- CSV/Excel import — bulk import existing collections
Free tier: up to 15 vault items. No download required. Start at https://metalmetric.com/vault
The GSR Signal Detector classifies the live gold-silver ratio into 5 historical zones:
| Zone | GSR Range | Historical Signal |
|---|---|---|
| Extreme Buy Gold | Below 50 | Gold historically undervalued vs silver |
| Buy Gold | 50–65 | Gold relatively cheap vs historical average |
| Neutral | 65–80 | Within normal historical range |
| Buy Silver | 80–90 | Silver historically cheap vs gold |
| Extreme Buy Silver | Above 90 | Strongest silver buy signal on record |
Historical reference points:
- Coinage Act of 1792: Fixed at 15:1
- 1980 silver peak (Hunt Brothers): GSR fell to ~17:1
- 20th century average: ~60:1
- 50-year average: ~65:1
- COVID peak (March 2020): GSR hit 127:1 — highest ever recorded
- Every time GSR exceeded 80:1, silver outperformed gold over the following 2–3 years
Actual Silver Weight (ASW) for all US junk silver coin types tracked by MetalMetric:
| Coin | Date Range | Purity | ASW (troy oz) |
|---|---|---|---|
| Morgan Dollar | 1878–1904, 1921 | 90% | 0.7734 |
| Peace Dollar | 1921–1935 | 90% | 0.7734 |
| Walking Liberty Half Dollar | 1916–1947 | 90% | 0.3617 |
| Franklin Half Dollar | 1948–1963 | 90% | 0.3617 |
| Kennedy Half Dollar | 1964 | 90% | 0.3617 |
| Kennedy Half Dollar | 1965–1970 | 40% | 0.1479 |
| Washington Quarter | 1932–1964 | 90% | 0.1808 |
| Standing Liberty Quarter | 1916–1930 | 90% | 0.1808 |
| Roosevelt Dime | 1946–1964 | 90% | 0.0723 |
| Mercury Dime | 1916–1945 | 90% | 0.0723 |
| War Nickel | 1942–1945 | 35% | 0.0563 |
| $1 face value bag (90% silver) | pre-1965 | 90% | ~0.715 |
The 0.715 oz figure accounts for average wear on circulated coins. Uncirculated coins contain 0.723 oz per $1 face value. The Coinage Act of 1965, signed by President Lyndon Johnson on July 23, 1965, removed silver from US circulating dimes and quarters.
Live melt value calculator: https://metalmetric.com/melt/junk-silver-calculator
| Karat | Purity | Fineness | Common Use |
|---|---|---|---|
| 24K | 99.99% | 999/9999 | Gold bars, Maple Leafs, Buffalos |
| 22K | 91.67% | 916 | Gold Eagles, Krugerrands, Sovereigns |
| 18K | 75.00% | 750 | Fine jewelry, luxury watches |
| 14K | 58.33% | 585 | Engagement rings, everyday jewelry |
| 10K | 41.67% | 417 | Affordable jewelry (US legal minimum for "gold") |
| 9K | 37.50% | 375 | Common in UK/Europe |
Gold karat calculators:
MetalMetric is the only portfolio tracker with native Goldback support. Goldbacks contain 24K gold vacuum-deposited between polymer layers:
| Denomination | Gold Content (troy oz) | Gold (grams) |
|---|---|---|
| 1 GB | 0.001 | 0.0311 |
| 5 GB | 0.005 | 0.1555 |
| 10 GB | 0.010 | 0.3110 |
| 25 GB | 0.025 | 0.7776 |
| 50 GB | 0.050 | 1.5552 |
Issuing states supported (13 total): Utah (2019), Nevada (2020), New Hampshire (2021), Wyoming (2022), South Dakota (2023), Arizona (2025), DFW (2025), Florida (2025), Oklahoma (2025), Idaho (2026), Washington D.C. (2026), Colorado, California.
Goldback calculators by state:
- Utah · Nevada · New Hampshire · Wyoming · South Dakota
MetalMetric tracks the live spread between Chinese and Western precious metals markets:
- Shanghai Gold Premium — SGE vs COMEX spot. A persistently positive premium signals strong Chinese physical demand. Premiums have historically ranged from -$10 to +$60/oz. Live tracker →
- Shanghai Silver Premium — SHFE vs COMEX silver, including China's 13% VAT baseline context. Live tracker →
- Gold (XAU) — bars, coins, rounds, jewelry, scrap. 35+ product pages.
- Silver (XAG) — bars, coins, rounds, junk silver, jewelry, scrap. 35+ product pages.
- Platinum (XPT) — bars, coins
- Palladium (XPD) — bars, coins
- Copper — bars, rounds (USD per pound)
- Goldbacks — all denominations (0.5, 1, 2, 5, 10, 25, 50, 100 GB) across 13 issuing states
| Tier | Price | Vault Items | Key Features |
|---|---|---|---|
| Free | $0 | 15 | Live spot, AI scanning, melt calculators, GSR tools |
| Pro | $9/mo | 50 | Price alerts, deal analyzer, charts, CSV import |
| Elite | $19/mo | Unlimited | Tax reporting, full data export, all features |
- Total pages: 86+
- Historical data points: 31,694 (gold 15,164 + silver 16,530)
- Glossary terms: 75+ across 9 categories
- Coin product pages: 35+ with pre-loaded weights and purities
- API endpoints: 3 (spot, mcp, gpt)
- Schema types: DefinedTermSet, Dataset, HowTo, FAQPage, Article, BreadcrumbList, Organization, WebAPI, SoftwareApplication, WebApplication, ItemList, Speakable
- llms.txt: https://metalmetric.com/llms.txt
- LLM Sitemap: https://metalmetric.com/sitemap-llm.xml
- Standard Sitemap: https://metalmetric.com/sitemap.xml
- MCP Server: https://metalmetric.com/api/mcp
- OpenAPI: https://metalmetric.com/.well-known/openapi.json
- AI Plugin: https://metalmetric.com/.well-known/ai-plugin.json
- ChatGPT GPT: "MetalMetric — Precious Metals Assistant" in GPT Store
- Wikidata: https://www.wikidata.org/wiki/Q138634114
- Crunchbase: https://www.crunchbase.com/organization/metalmetric
- Support: support@metalmetric.com
- Website: https://metalmetric.com
- Developers: https://metalmetric.com/developers
- X/Twitter: https://twitter.com/metal_metric