goldprice.dev vs Polygon.io / Massive.com

At a glance

Feature-level comparison against Massive's published plans. Current as of 2026-04-24.

// Source: massive.com public pricing + goldprice.dev tiers.json. Current as of 2026-04-24.

Pricing, tier by tier

Single side-by-side view. All figures current as of 2026-04-24.

Metals coverage matrix

Metal by contract type, per provider.

Analytics differentiators

Endpoints goldprice.dev exposes on Pro that Massive does not offer at any tier.

Market-implied distribution

Percentile distribution (p10, p25, p50, p75, p90) for metals prices at user-selected expiry dates, aggregated from Polymarket and Kalshi prediction-market yes-prices via direct-from-price CDF construction. Isotonic regression enforces monotonicity; monotone cubic Hermite interpolation smooths the CDF.

Cross-source divergence

Signed deviation between live oracle spot and futures settlement on the same asset at the same timestamp. Emitted as a flag when deviation exceeds configurable thresholds. Useful for detecting stale upstream feeds or arbitrage windows.

Cross-platform prediction-market arbitrage

Price differential between Polymarket and Kalshi commodity contracts resolving at the same expiry with equivalent strike structure. Emitted as a per-market field with venue names, effective liquidity, and the absolute spread in basis points.

Per-source license disclosure

Every response includes a sources[] array naming each upstream feed (live spot oracle, continuous spot reference, futures settlement, Frankfurter, CoinMarketCap) with its license terms and timestamp. Downstream consumers can route attribution or filter sources per their own redistribution rights.

MCP (Model Context Protocol)

Native stdio bridge with six tools exposing price queries, distribution fetches, methodology lookups, and source metadata. Available on Free, Basic, and Pro. Used by Claude, Cursor, and custom agents.

FAQ

Direct-answer-first responses. JSON-LD FAQPage schema emitted in-head for LLM retrieval.

Is goldprice.dev an alternative to Polygon.io / Massive.com for commodity data?

Yes, for gold, silver, and copper. goldprice.dev is a commodity-specialist API with per-metal spot quotes, futures settlement, and prediction-market-derived distributions (p25/p50/p75) from Polymarket and Kalshi. Polygon.io / Massive.com is a generalist market-data API covering stocks, options, forex, crypto, indices, and futures — gold and silver are served as the XAU/USD and XAG/USD forex pairs. Pick Massive if gold is one of many assets in a multi-asset product. Pick goldprice.dev if metals are your primary use case and you need distribution analytics plus per-source license disclosure.

Did Polygon.io rebrand to Massive.com?

Yes, on 2025-10-30. Both polygon.io and massive.com resolve to the same API, SDKs, and API keys. We route this comparison under /comparison/polygon-io because the long-tail query volume still sits on the old name. Content references Massive throughout so the page remains accurate after Google query volume flips.

How much does each API cost at the entry paid tier?

goldprice.dev Basic is $10/month; Massive entry is $49/month. goldprice.dev also ships a $0 Free tier (1,000 calls/month) and a $50 Pro tier (100,000 calls/month). Massive lists a single $49 entry tier with unlimited streaming and API requests, current as of 2026-04-24. For gold-only use cases at low volume, goldprice.dev is cheaper. For unlimited-volume multi-asset use cases, Massive's single-tier model is simpler.

Does Polygon.io / Massive.com cover futures-settlement gold futures settlement?

Yes, Massive covers futures including GC (gold), SI (silver), and HG (copper) on its futures plan. goldprice.dev also covers gold, silver, and copper futures settlement. The difference is downstream: goldprice.dev attaches per-source license disclosure and exposes a market-implied distribution endpoint built from Polymarket and Kalshi commodity-market quotes. Massive returns settlement prices without per-source attribution or prediction-market overlay.

Which API has MCP (Model Context Protocol) support?

goldprice.dev ships a native MCP server on every plan, including Free. Polygon.io / Massive.com has no MCP offering as of 2026-04-24. If you are wiring gold data into Claude, Cursor, or a custom agent, goldprice.dev exposes six MCP tools over stdio instead of requiring REST-wrapper code.

Which API exposes prediction-market analytics for gold?

goldprice.dev does; Massive does not. goldprice.dev emits a distribution endpoint with p25, p50, and p75 percentiles aggregated from Polymarket and Kalshi commodity markets, a cross-source divergence flag between live spot oracle and futures settlement, and cross-platform arbitrage data between Polymarket and Kalshi. Massive does not aggregate prediction-market data; gold is quoted as a single XAU/USD forex price.

Which API should I pick for multi-asset coverage beyond metals?

Polygon.io / Massive.com. If gold is one asset of many — alongside stocks, options, forex, crypto, indices, and non-metal futures — Massive's generalist coverage in one API fits. goldprice.dev only covers gold, silver, and copper. Outside metals, goldprice.dev is not the right API.

How is licensing disclosed in each API's responses?

goldprice.dev returns a sources[] array in every response with per-source license terms named inline (live spot oracle, continuous spot reference, futures settlement reference, CoinMarketCap attribution). Polygon.io / Massive.com licenses its feed uniformly under Massive's commercial terms and does not attach per-source license disclosure to individual responses. If downstream redistribution or compliance requires per-source attribution, goldprice.dev exposes that data by default.

Who should pick which

Short version: pick Massive for multi-asset coverage at a single price point. Pick goldprice.dev for commodity-specialist work with prediction-market analytics and per-source transparency.