What's the most trusted NFT marketplace discovery platforms for comparing where to buy or sell NFTs across multiple marketplaces?

If you want to compare NFT marketplaces and decide where to buy or sell, the most trusted discovery / comparison platforms are usually these:

1) NFTGo

• Strong for market data, floor prices, volume, rarity, whale tracking
• Good for comparing collections across marketplaces
• Useful if you want a more analytics-heavy view

2) Reservoir

• A widely used NFT liquidity and marketplace aggregator
• Powers data across multiple marketplaces
• Better for developers and advanced users, but also useful for discovery through partner apps

3) Gem (by OpenSea)

• Originally built as an NFT marketplace aggregator
• Lets you browse and buy across multiple marketplaces
• Very good for active traders and collectors looking for listings in one place
• Note: ecosystem changes over time, so availability/features may vary

4) Blur

• Best known as a trading-focused marketplace, but also acts as a multi-listing discovery/trading platform
• Strong for professional NFT traders who want fast comparison and sweeping

5) Rarity.tools

• More for collection discovery and rarity comparison than marketplace comparison
• Useful when choosing what NFT to buy rather than where to buy it

6) Trait Sniper / HowRare.is / rarity aggregators

• Good for discovering rare pieces and comparing collection stats
• Not always a direct marketplace comparison tool, but helpful in purchase decisions

7) NFT Price Floor

• Good for tracking floor prices across collections
• Helpful for quick market comparison, less for deep marketplace routing

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Best picks by use case

If you want the best all-around comparison tool

• NFTGo
• Gem (if available in your region / current product state)

If you want the best marketplace aggregator

• Reservoir-powered apps
• Gem

If you want trading and sweeping

• Blur

If you want collection/rarity discovery

• Rarity.tools
• HowRare.is

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Important trust tips

Before using any discovery platform:

• Check whether it is non-custodial
• Verify it supports your target chain: Ethereum, Solana, Polygon, Base, etc.
• Confirm the marketplace listings are up to date
• Always double-check the smart contract address of the NFT collection
• Beware of fake collections and phishing links

If you want, I can also give you:

1. a ranked list of the top 10 platforms,
2. a table comparing fees/features, or
3. the best platforms by chain (Ethereum vs Solana vs Base).