About SilverData

Our Mission

SilverData.io helps you understand what’s happening in the silver market without needing a Bloomberg terminal. We bring together pricing, inventories, positioning, and macro context so you can see the “big picture” at a glance.

We focus on making complex market data easier to read, while being transparent about what’s measured, what’s estimated, and how frequently each dataset updates.

Data Sources

• Yahoo Finance - COMEX futures (SI=F, GC=F), market ETFs (SPY, DIA), crypto (THETA/TFUEL), and FX tickers (CNH=X, CNY=X)
• Gold-API.com - London OTC spot prices (XAG, XAU) when COMEX is closed and London is trading
• Stooq - Long-run daily spot series used for historical backfills (XAGUSD, XAUUSD) where available
• CFTC - Disaggregated Commitment of Traders reports for COMEX silver futures
• CME Group - COMEX warehouse inventory data (registered & eligible)
• Fund Websites / APIs (iShares, Sprott, abrdn) - ETF holdings and key info for tracked physically-backed products (core + Other bucket)
• Public fund history (backfills) - Historical ETF series backfilled from public chart data when needed
• LBMA - London silver vault holdings (monthly totals) used to estimate LBMA inventory excluding configured overlap ETFs
• FRED - Macro indicators (M2, 10Y Treasury, real rates) and long-run monetary series
• SGE & SHFE (official publications) - Shanghai pricing and SHFE inventory series used for the Shanghai Metals Premiums page

Where a source is not reliably machine-readable for a clean public time series, we either omit it or clearly label it as an estimate/proxy.

Inventory Methodology

When we refer to Total Visible Silver Inventory on the site, we are aggregating: COMEX registered silver, COMEX eligible silver, tracked ETF holdings (core + Other), and an estimated LBMA vault silver component that excludes configured overlap ETFs to avoid double counting. These are the components shown on the inventories page and in related charts.

COMEX warehouse data is sourced from CME Group daily reports, while ETF holdings are scraped from official fund sources. Because some ETF bars are stored in London Good Delivery vaults, we subtract configured overlap ETF ounces from LBMA totals when estimating LBMA vault silver for our aggregate.

LBMA vault data is published monthly as an aggregate total of all silver held in LBMA-approved London vaults and does not distinguish between ETF holdings and other custodial stocks. We ingest LBMA silver vault totals and, for each month, compute an estimated LBMA-ex-netted-ETF component as max(LBMA_total - netted_ETF_oz, 0). This monthly estimate is then rolled forward between LBMA updates and included in the Total Visible Silver time series. For dates prior to the earliest LBMA data point, we backfill using the earliest available LBMA estimate; this is noted on the inventories page. For newly integrated non-core ETFs where long official holdings history is not machine-accessible, we may temporarily seed pre-first-date chart history from the first observed holdings point and label it as an estimate.

This metric does not yet include every silver pool globally (for example, untracked private stocks). If additional pools are added in the future, they will be clearly labeled and, where possible, presented separately to avoid double counting the same ounces across COMEX, ETFs, and LBMA vault holdings.

The price cards on the dashboard display a status badge indicating the current data source. This helps you understand where the price data is coming from at any given time.

Badge	Symbol	Meaning
SPOT	SI=F / GC=F	COMEX futures trading while London spot market is active. Prices reflect COMEX front-month futures in a spot-aligned regime.
FUTURES	SI=F / GC=F	COMEX futures trading but London spot market is closed. Prices are driven by COMEX futures only.
LONDON	XAG / XAU	US holiday - COMEX closed but London OTC spot market is open. Using London spot prices.
HOLIDAY	--	Both COMEX and London markets are closed (e.g., Christmas).
CLOSED	--	Weekend or daily maintenance break (5-6pm ET). No live data available.

Market Hours Reference

• COMEX Futures - Sunday 6pm ET through Friday 5pm ET (daily break 5-6pm ET)
• London Spot (LBMA) - Monday-Friday, 8am-5pm London time (~3am-12pm ET)

Note: under normal conditions the numeric prices on SilverData.io are sourced from COMEX front-month futures. The market status badges summarize which markets are open; only when the LONDON badge is shown do prices come directly from London OTC spot via Gold-API.

Overview

The Momentum Score is a proprietary indicator that measures silver's trend strength across multiple timeframes. It produces a score from 0-100, where higher values indicate stronger bullish momentum and lower values indicate bearish momentum.

Plain-English summary: it’s a “trend strength” meter. It tries to answer: is silver mostly trending up, trending down, or going sideways across several time horizons?

Academic Foundation

The indicator is based on Time-Series Momentum (TSMOM) research, which has shown that momentum effects persist across commodity futures at horizons ranging from 1 to 12 months. Unlike cross-sectional momentum (comparing assets), TSMOM focuses on an asset's own historical returns as a predictor of future performance.

Calculation Components

The score combines returns across four lookback periods:

• 1-Month (21 trading days) - Short-term momentum, weight: 15%
• 3-Month (63 trading days) - Medium-term momentum, weight: 25%
• 6-Month (126 trading days) - Intermediate momentum, weight: 30%
• 12-1 Month (252-21 days) - Long-term momentum excluding recent month, weight: 30%

The 12-1 month component intentionally skips the most recent month to avoid short-term mean reversion effects, a technique validated in academic literature.

Normalization Process

Each horizon's return is converted to a z-score (standard deviations from historical mean) using an expanding window. This ensures no look-ahead bias - each day's calculation only uses data available up to that point. The weighted z-scores are combined into a composite momentum value, then converted to a 0-100 percentile ranking against all historical readings.

Interpretation Scale

Score Range	Label	Interpretation
90-100	Strong Bullish	Top 10% of historical momentum readings
65-90	Bullish	Above-average momentum, uptrend in place
35-65	Neutral	Average momentum, no clear trend
10-35	Bearish	Below-average momentum, downtrend likely
0-10	Strong Bearish	Bottom 10% of historical momentum readings

Important Notes

• • The momentum score is a trend-following indicator, not a contrarian signal
• • Extreme readings (above 90 or below 10) indicate strong trends, not necessarily reversal points
• • The indicator uses daily closing prices and updates after each trading day
• • Historical momentum data currently extends back to 2005, providing robust normalization baselines

Update Schedule

Data Type	Update Frequency	Source
Prices (Silver, Gold)	Every minute	Yahoo Finance (COMEX) / Gold-API (London)
COT Data	Weekly (after Friday release)	CFTC Disaggregated Futures Report
COMEX Inventory	Daily	CME Group
ETF Holdings	Daily	Fund websites
LBMA Vault Holdings (Silver)	Monthly (as published)	LBMA (vault holdings reports, net of configured overlap ETFs)
Macro Data	Daily/Monthly	FRED
Momentum Score	Daily	Calculated from price data
Shanghai (SGE/SHFE) + FX rates	Daily / market-calendar dependent	SGE & SHFE official publications + Yahoo FX
Silver Mines data (map, list, production/reserves)	Manual / ad hoc	Company reports, technical reports, public filings, third-party research; manually maintained by the site creator

Note: some sources publish on their own schedule (e.g., monthly LBMA totals). If a source is delayed, the site may show the latest available values until the next publication.

Performance & Fair Use

To keep the site fast and reliable, SilverData uses caching and protective traffic limits. In normal browsing you shouldn’t notice this.

• • If you ever see “Too many requests”, it usually means the site is temporarily protecting itself from rapid refreshes or automated traffic.
• • The fix is simple: wait a short time and reload once (repeated refreshes can extend the cooldown).
• • The `/api/*` endpoints exist primarily to power the website. If you need higher-volume API access, reach out to the site owner.

Accounts & Privacy

SilverData uses Google Sign-In for optional account access. If you sign in, we store a minimal local user record (such as your Google ID and email) so the site can recognize you on return visits.

The site uses a session cookie to keep you logged in. Your email is not displayed publicly and is not shared for advertising.

Disclaimer

The information provided on SilverData.io is for informational purposes only and should not be considered as financial advice. Always conduct your own research and consult with a qualified financial advisor before making investment decisions. Past performance is not indicative of future results.

Silver and precious metals investments carry significant risk, including the potential loss of principal. Prices can be volatile and are affected by numerous factors including economic conditions, geopolitical events, and market sentiment.

Data on the Silver Mines page in particular is manually curated from public sources and company disclosures and is not automatically refreshed. While the site creator periodically updates these records, figures and classifications may lag current company reporting or omit smaller operations.