Eight Crypto Wallet APIs Ranked by What Developers Actually Need

The Infrastructure Beneath Every Balance Your Users See

A wallet API is not a commodity swap. It sits under every portfolio balance, transaction alert, and DeFi position your application surfaces – and ripping one out later means rewriting parsers, rebuilding caches, and re-running test suites from scratch. Choosing the right one from the start is an architectural decision as much as a commercial one.

Why the Market for Wallet Data Is Only Getting Larger

The scale of the user base demanding this kind of data has become hard to ignore. According to a16z crypto’s State of Crypto 2025 report, somewhere between 40 and 70 million people actively use crypto, with an estimated 716 million owners overall and roughly 181 million monthly active addresses. Mobile wallet users reached an all-time high in that period, up 20% year over year. These are not speculative projections – they reflect the actual query load that wallet APIs are absorbing today.

What makes those figures more striking is how they held through the 2025-to-2026 market downturn. Chainalysis data shows that onchain economic activity declined just 1.6% even as the total crypto market cap dropped approximately 50%. Philip Gradwell, vice president of economics at Tether, described the pattern in Chainalysis’ 2026 Geography of Crypto report: “Activity has become consistent, routed through wallets in a steady rhythm rather than in bursts.” Developers building on wallet APIs are therefore building on an infrastructure layer with demonstrated stickiness – users kept transacting even when prices collapsed.

Provider longevity is a separate concern, and one that hit teams concretely in 2026. Dune retired Sim, its real-time wallet API, on August 1, 2026, giving developers just 75 days’ notice. It named Codex as its recommended migration partner, but any team that had built deep integrations still faced a significant rewrite. That event reframes how developers should evaluate any of the eight options below – not just on features and pricing, but on organizational stability and whether the provider has an exit history.

This review covers wallet data APIs specifically – the read side of the stack. These are services that take a public address and return balances, transaction history, DeFi positions, and profit-and-loss calculations. Tools that create or custody wallets for end users belong to a different product category and appear here only where a single provider handles both functions. All comparisons below are drawn from official documentation and pricing pages rather than from marketing materials.

Eight APIs, Eight Different Answers to the Same Problem

No single wallet API wins every category. The eight options reviewed here each occupy a different part of the market, and the decision mostly comes down to matching your application’s data requirements against what each provider actually delivers at scale.

CoinStats API is the strongest general-purpose option for developers who need balances, DeFi positions, and profit-and-loss data from a single authentication key. It fits portfolio trackers, tax tools, and wallet applications that need a wide surface area of data without managing multiple integrations. The free tier offers 20,000 credits per month, and the Starter plan runs $49 per month. GoldRush is the better choice for teams that need deep multichain transaction history, including Bitcoin, and it starts with a 14-day trial before the entry Vibe Coding plan at $10 per month – a notably low barrier for what it offers.

Codex targets real-time trading applications, bots, and AI agents where latency is the primary constraint. It offers 10,000 requests per month for $1 at signup, but the production-grade Growth plan starts from $350 per month, which positions it firmly for commercial applications rather than side projects. Allium serves finance, accounting, and compliance teams – use cases where data provenance and audit trails matter more than speed. It does not publish a free tier and charges $0.03 per wallet call on a pay-per-call model, which can work efficiently for batch compliance workflows but becomes expensive under high read volume.

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Nansen API adds a layer that the others do not offer: wallet labels and smart-money context. It can tell you not just what a wallet holds but what category of actor that wallet likely represents. The free tier provides 100 credits and then 10 per day, with the Pro plan at $49 per month billed annually. Blockscout PRO API focuses on EVM explorer data and offers one of the most generous free tiers in this group – 100,000 credits per day – before the Builder plan at $49 per month. For teams building EVM-specific tooling on a limited budget, the free tier alone covers substantial development and early production traffic. Blockchair specializes in Bitcoin-family address lookups across chains like Bitcoin, Litecoin, and Dogecoin, with a free tier of 1,000 calls per day and a short trial; its paid pricing is not publicly listed. Finally, thirdweb API is the option for applications that need to both create wallets for users and read their data, with a Growth plan at $99 per month and no documented free tier.

Pricing across all eight providers changes frequently. The figures above reflect official documentation at time of review and should be verified directly before any purchasing decision.

Why a Single Address Is Never a Single Lookup

The technical complexity behind wallet APIs explains a lot about why provider pricing and coverage vary so dramatically. A wallet does not live in one place, and each major chain family stores balances in structurally different ways. On EVM chains, Ethereum uses two account types – externally owned accounts and contract accounts – and the same address can hold assets across every EVM-compatible network simultaneously. One user address can therefore require dozens of parallel lookups across Ethereum, Base, Arbitrum, and other chains to build a complete picture.

Solana adds a different layer of complexity. Tokens on Solana do not sit on the wallet address itself. The Solana token model requires a separate token account for every individual token a wallet holds, which means an API must locate and aggregate those accounts before it can return a complete balance. Bitcoin introduces yet another pattern: funds spread across many derived addresses, with the BIP-32 standard allowing one extended public key – an xpub – to reveal the full address tree. That same specification flags xpubs as requiring more careful handling than standard public keys, since exposing one reveals an entire wallet’s address history. Each of these structural differences is a distinct engineering problem that the API provider has already solved, and the quality of that solution is exactly what separates the eight options above.

The comparison table below summarizes entry points across all eight options, but the actual decision depends on which chain families your application needs, whether you require DeFi position data or just token balances, and whether real-time latency or historical depth is the harder constraint to meet.

• CoinStats API – Portfolio trackers, tax tools, wallet apps – 20,000 credits/month free – Starter at $49/month
• GoldRush – Multichain wallet history including Bitcoin – 14-day trial – Vibe Coding at $10/month
• Codex – Real-time trading apps, bots, AI agents – 10K requests/month at $1 signup – Growth from $350/month
• Allium – Finance, accounting, compliance – No public free tier – $0.03 per wallet call
• Nansen API – Wallet labels and smart-money context – 100 credits then 10/day – Pro at $49/month annually
• Blockscout PRO API – EVM explorer data on a budget – 100,000 credits/day – Builder at $49/month
• Blockchair – Bitcoin-family address lookups – 1,000 calls/day – Paid pricing not listed
• thirdweb API – Apps that also create wallets for users – No $0 plan listed – Growth at $99/month

Dune’s shutdown of Sim with 75 days’ notice is not an anomaly in this space – it is a reminder that the API tier of the crypto stack consolidates, pivots, and occasionally disappears. Blockchair’s unlisted paid pricing and Allium’s absence of a public free tier both point to negotiated enterprise relationships rather than self-serve stability, which is a different kind of risk for smaller teams without leverage in those conversations.