Best wallet labeling API provider

Helius currently leads the active chain tab at 84.1% (24 h) across 9 measured providers. The leaderboard re-sorts every 30 minutes against fresh Prometheus samples, so the answer reflects the last 24 hours of live audits against ~180 curated anchor addresses, not a marketing-page claim. The Kind tab at the top of the page switches between EOA coverage (entity identification on plain wallets) and contract coverage (smart-contract name resolution); the right answer depends which job your product is doing.

Two different jobs, two different scores. Contract coverage measures whether the provider returns a name for a verified smart contract (Uniswap V3 router, WETH9, Aave V3 pool). The name lives in the contract's verified source code, so any chain explorer that indexes verified contracts will saturate near 100% on this tab. EOA coverage measures whether the provider resolves an externally-owned account (a plain wallet, no code) to a curated entity name (`Binance hot wallet 14`, `Vitalik Buterin`, an OFAC SDN address). EOAs carry no on-chain signal at all, the name has to come from a curated knowledge graph. The EOA tab is the honest comparison between Mobula's, Moralis's, Helius's, TonAPI's etc. label graphs; the Contract tab is the comparison between Blockscout's and other explorers' verified-source pipelines. The bench previously averaged the two together, which mechanically favoured explorers over entity-graph APIs.

A wallet labeling API takes an address and returns an entity name. The CEX it belongs to (`Binance hot wallet 14`), the protocol (`Uniswap V3 router`), the multisig owner (`Safe: foundation treasury`), the sanctioned status (`OFAC SDN`), or a public-figure tag (`Vitalik Buterin`). Generic categorical labels like `EOA`, `Contract`, `Wallet` are not considered a hit on this benchmark because they carry no entity signal.

It depends on the chain and on the kind. Mobula is a universal provider audited on every chain it advertises and currently returns 43.2% on the active tab. Helius is Solana-only and dominates that chain because its label graph is curated against native Solana programs. Moralis is EVM-centric and trails on Gram, Stellar, XRP and Bitcoin. The Kind = EOA tab is where curated entity graphs (Mobula, Helius, chain specialists) actually compete; the Kind = Contract tab favours explorers like Blockscout because they read verified source code for free.

Arkham and Nansen own the consumer visualization layer (browse-the-web-of-onchain-money). The builder side of the question, the API integrated under the hood by wallets, portfolio trackers and AML flows, lives elsewhere. Mobula, Helius, Moralis, Blockscout, OLI, TonAPI, StellarExpert, XRPScan and WalletExplorer are the labeling APIs benchmarked here. Pick the one whose coverage matches the chains your product touches and whose response shape fits your integration latency budget.

The harness maintains a curated list of ~180 publicly-known anchor addresses (CEX hot wallets, DEX routers, Safe multisigs, OFAC SDN, public figures, verified smart contracts) rotated quarterly from public sources (Etherscan public name tags, Treasury OFAC list, Safe registry). Each anchor is tagged with a kind (contract or eoa) at curation time using an on-chain code probe. Every 30 minutes each address is pushed to every provider that declares support for its chain. A `hit` is recorded only when the response is a non-generic entity name. Coverage is `success_total / checks_total` over 24 hours, sliced per chain AND per kind so chain-specialists are not penalised on chains they do not claim to cover, and the contract-name signal does not get conflated with the entity-curation signal.

Blockscout reads verified contract source code on every chain it indexes. For any verified smart contract (Uniswap V3 router, an Aave pool, the WETH9 contract) the contract's source already contains a constructor name like `Aave V3 Pool` or `Uniswap V3 Router`, so Blockscout returns it for free without curating anything. That's why it saturates near 100% on the Contract tab. On the EOA tab Blockscout drops sharply because EOAs have no source code to read, the entity name has to come from a curated `public_tags` table which is chain-instance-specific and far less complete. The bench used to average the two jobs into one number, which made Blockscout look stronger than it actually is at the entity-curation job. The Kind tab separates the two so each provider is judged on the job it actually does.

Helius returns 84.1% on Solana. Chain-specialists dominate their home chain because their label graph is curated against native protocols (Jito stake pools, Jupiter routers, Pump.fun creators, Magic Eden marketplace programs) rather than translated from an EVM-shaped schema. Universal providers (Mobula, Moralis) are also audited on Solana, but switch the chain tab to Solana to see the direct comparison rather than the cross-chain average.