Agent Wallets Compared: Crossmint, Privy, Turnkey, Coinbase, lobster.cash

Key takeaways

• Agent wallets are smart contract wallets. EOAs, the default wallet type on most blockchains, can’t provide the onchain spending controls, owner/agent separation, or signer rotation that make autonomous agent transactions safe. Smart contract wallets encode these rules onchain, which is why every serious agent wallet product either is a smart contract wallet or is designed to sit as a signer inside one.
• Six platforms in this comparison are relevant for agent wallet deployments in 2026. Three are purpose-built smart contract wallet products for agents (Crossmint, Coinbase Agentic Wallets, thirdweb). Three are signing infrastructure products that provide key management, TEE-backed signing, and off-chain policy enforcement (Turnkey, Privy, Alchemy), and that can be composed into a smart contract wallet setup as the signer layer. The distinction matters because smart contract wallets enforce policies onchain, where a bug in the agent can’t bypass them.
• Crossmint is currently the only platform in this comparison that gives agents native access to both stablecoin rails and card network rails (Visa, Mastercard) through a single integration.

Introduction

AI agents can browse the web, write code, and analyze data. Soon, they will make payments for us and become economic actors.

Two paradigm shifts are enabling agentic payments. Card networks like Visa and Mastercard have launched agentic payments protocols that let agents transact over traditional rails. At the same time, stablecoin rails are opening up a different path, one where payments skip the card networks and banks entirely. That means faster settlement, lower transaction costs, and 24/7 availability.

Agent wallets sit at the center of this. They give AI agents their own blockchain wallets with programmatic transaction capabilities and human-defined spending limits. The agent decides when to pay; the wallet enforces how much it can spend. This guide compares the platforms you can actually use to deploy agent wallets in production, with a focus on what makes them architecturally suited (or not) to agent use cases.

How agent wallets work

Every wallet on every blockchain is authorized by a signer. In the simplest case, the signer is a single private key held by one person, and every transaction requires that person’s approval. For AI agents, that model doesn’t work: the whole point is that the agent acts autonomously, and waiting on a human for each transaction defeats the purpose.

Agent wallets solve this with two design choices. First, the wallet is a smart contract rather than a regular externally-owned account. A smart contract wallet is an onchain program that holds the assets and defines its own rules for who can authorize transactions. That’s the wallet layer. Second, the signer is a separate layer decoupled from the wallet. Multiple signers can be configured on the same wallet, each with its own key and its own permissions, and the smart contract enforces which signer can do what.

For agent use cases, this usually looks like a two-signer setup. The owner signer (held by a person or a company) has full control: it can set policies, freeze the wallet, move funds, and rotate other signers. The agent signer (held in a Trusted Execution Environment so the key never exists in memory or on disk outside the enclave) has scoped control: it can transact autonomously, but only within the bounds the smart contract enforces — per-transaction limits, daily caps, allowlisted recipients, time windows, or any other policy the owner configures. A bug in the agent’s code can’t bypass these, because they’re enforced at the wallet level, not at the application level.

Why agent wallets need to be smart contract wallets

The dominant wallet type on most blockchains is the externally-owned account, or EOA. An EOA is controlled by a single private key. Whoever holds that key has full, unconditional authority over the wallet. For a human user who reviews each transaction manually, that model is workable. For an autonomous agent, it’s a problem.

An EOA can’t enforce spending limits onchain. It can’t separate owner authority from agent authority. It can’t rotate signers without migrating assets. Any controls you add — rate limits, allowlists, spend caps — live in application code or in a signing service, and a bug in the agent or a compromise of the service can circumvent them. For a product where the agent is going to spend real money at scale, onchain enforcement isn’t a nice-to-have. It’s the architecture the use case requires.

Smart contract wallets encode authorization rules directly in the contract. Multiple signers with different permission sets. Per-transaction limits, rolling caps, recipient allowlists, time-window restrictions, multi-sig approvals for high-value transactions. The rules live onchain and every transaction is checked against them before it executes. When the agent’s signing key is in a TEE and the policies are in the contract, you get an agent that can transact autonomously and an owner who can trust the boundaries will hold.

This is the lens for the rest of the comparison. Some platforms ship smart contract wallets natively and are designed for agent use cases from the ground up. Others ship signing and key management infrastructure that can serve as the signer layer inside a smart contract wallet setup. Both are useful. The difference is how much of the stack you’re getting and how much you’re assembling yourself.

Smart contract wallet infrastructure for agents

Crossmint

Crossmint is a stablecoin and wallet infrastructure platform. Agent wallets on Crossmint are smart contract wallets deployed across EVM chains, Solana, and Stellar, configured with a two-signer setup for agent use cases: the owner signer (your team or the user) and the agent signer (sealed in a TEE), with policies like per-transaction limits, rolling caps, and recipient allowlists enforced by the smart contract itself. Signers are modular, so the signing layer can be rotated without changing wallet addresses or migrating assets.

What distinguishes Crossmint in this comparison is rail coverage. Stablecoin payments are available on EVM chains, Solana, and Stellar for fast, low-cost transactions, and agents can also pay over Visa’s and Mastercard’s agentic payment protocols for merchants that don’t accept crypto. Agent platforms can easily integrate full-stack agentic payments using lobster.cash, built by Crossmint in collaboration with Visa, Solana, Circle, Stytch, and Basis Theory, is how agents get the right payment mechanism for each purchase. The owner can issue a virtual card with spending limits (via Visa's VIC technology, usable anywhere credit cards are accepted) or a USDC stablecoin wallet (on Solana, compatible with x402), depending on what the agent needs to buy. On compliance, Crossmint holds CASP licenses across all 27 EU member states under MiCA, with KYC/KYB, AML screening, and travel rule compliance built in.

Coinbase Agentic Wallets

Coinbase Agentic Wallets, launched in February 2026, is built on top of Coinbase’s earlier AgentKit SDK and the x402 protocol for agent-to-service micropayments. Under the hood, the wallets are smart contract wallets via the Coinbase Developer Platform Smart Wallet API, with programmable spending limits, session caps, and transaction controls enforced at the TEE level. A command-line interface lets developers check on agents, fund wallets, and deploy new skills with simple commands.

Coverage is EVM chains and Solana, with gasless transactions on Base via Coinbase’s paymaster. Framework support includes OpenAI Agents SDK, LangChain, MCP, and Vercel AI SDK. Card network rail integration is not part of the product; payments are stablecoin and crypto only, oriented around x402 micropayments. Coinbase Agentic Wallets is a strong choice for teams already building on Base or comfortable in the Coinbase Developer Platform ecosystem.

thirdweb

thirdweb provides agent wallet capabilities through its Engine product, with backend wallets, gas optimization, transaction queuing, and session keys for scoped agent permissions. The underlying wallets support both ERC-4337 smart accounts and EIP-7702 smart EOAs, so teams can choose the specific smart wallet standard that fits their setup. thirdweb’s Nebula product adds a natural-language interface for blockchain interactions, built on the t1 model trained on 2,500+ EVM chains.

Framework integrations cover OpenAI Agents, LangChain, CrewAI, AutoGen, LlamaIndex, and MCP. The focus is EVM, with some Solana support added in 2025. Card network rails are not supported. For teams building agents that primarily transact in stablecoins on EVM chains and value a mature SDK with broad framework support, thirdweb is a credible option.

Signing infrastructure that can sit inside a smart contract wallet setup

These platforms don’t ship full agent wallet products. They ship the signer layer — key management, TEE-backed signing, and off-chain policy enforcement — that can be plugged into a smart contract wallet setup as the signer for the owner, the agent, or both. You’ll need to pair them with a smart contract wallet platform (like Crossmint, which is signer-agnostic) if you want onchain policy enforcement end to end.

Turnkey

Turnkey is a non-custodial signing platform that runs key operations inside secure enclaves. It supports EVM, Solana, Bitcoin, and TRON through a signing API, and includes a policy engine for transaction limits, address whitelisting, and MFA-style approval flows. Turnkey’s policies are enforced off-chain at the signing layer: the service refuses to sign transactions that violate policy, rather than the smart contract rejecting them onchain.

Turnkey is used as the signing layer in several production agent systems and integrates cleanly with ERC-4337 smart wallet setups through its Smart Wallet Signer, which ties the wallet address to the smart contract rather than to the key. This is a solid match for teams that want hardware-grade signing security and want to build their own agent layer, including the onchain wallet policies, on top.

Privy

Privy provides embedded wallets and server wallets with off-chain policy enforcement. Agent wallets get attached policies covering transfer limits, approved protocols, recipient restrictions, and operating time windows. Privy’s default wallet model is an EOA secured through a combination of TEEs and Shamir’s Secret Sharing, available across EVM, Solana, Bitcoin, Stellar, and other chains. On EVM only, Privy additionally offers ERC-4337 smart wallets controlled by a Privy embedded signer.

Privy was acquired by Stripe in June 2025 and operates as a standalone product within the Stripe ecosystem. For agent use cases, Privy can serve as the signer inside a smart contract wallet setup (including with Crossmint), with agent policies enforced at the signing layer. Teams building pure EOA-based agent wallets on Privy directly will get fast, production-tested signing but will rely on Privy’s off-chain policy engine rather than onchain enforcement.

Alchemy

Alchemy is a blockchain developer platform. Its agent wallet story is built around three pieces: TEE-backed signing, the x402 protocol for pay-per-call API micropayments (when an agent’s compute credits run out, the system tops up with USDC), and Smart Wallets based on ERC-4337 and EIP-7702 for account abstraction setups. Alchemy’s Smart Wallets can be used standalone or as the smart wallet layer underneath a third-party signer — the Privy integration, for example, lets a Privy-managed EOA serve as the signer for an Alchemy smart account.

This positions Alchemy as infrastructure that other platforms compose with, rather than a turnkey agent wallet product. For teams building their own agent stack and wanting Alchemy’s smart wallet and paymaster infrastructure underneath, it’s a useful piece. For teams that want agent wallets as a single product, the more direct options are the purpose-built platforms above.

Building an agentic product or platform? Reach out to learn more about Crossmint’s agent wallets.

How to choose the best agent wallet

The right platform depends on what you’re building and what you want to own.

Think about payment rails first. Most platforms in this comparison only support stablecoin and crypto payments. If your agents also need to transact over card networks (Visa, Mastercard), Crossmint is currently the only platform that bridges both. Stablecoin rails give you lower fees, faster settlement, and 24/7 availability. Card rails give you merchant acceptance where crypto isn’t an option. The best setup depends on where your agents are spending.

Think about where policies are enforced. Platforms that ship full smart contract wallets (Crossmint, Coinbase Agentic Wallets, thirdweb) enforce agent policies onchain, where a bug in the agent can’t bypass them. Platforms that ship signing infrastructure with off-chain policy engines (Turnkey, Privy) enforce at the signing service layer, which is effective in normal operation but depends on the integrity of the service and the code path. For high-value or adversarial settings, onchain enforcement is the stronger model.

Decide how much you want to build. If you need wallets and payments in one place, a purpose-built platform (Crossmint, Coinbase Agentic Wallets, thirdweb) reduces integration overhead. If you want hardware-grade signing that you’ll compose into your own agent stack, a signing infrastructure platform (Turnkey, Privy, Alchemy) gives you more architectural control at the cost of building the wallet and payments layers yourself.

Consider cost. Stablecoin transactions on Layer 2 networks are typically low-cost, which makes micropayments viable. Card network transactions carry standard processing costs. If your agents are making high-frequency, low-value payments (API calls, compute, data), stablecoin rails are generally more cost-effective. If they’re making fewer, higher-value purchases from traditional merchants, card rails may be the only option.

Evaluate framework compatibility. thirdweb has integrations with several AI frameworks (OpenAI Agents, LangChain, CrewAI, AutoGen, LlamaIndex, MCP). Coinbase AgentKit has OpenAI Agents SDK, LangChain, MCP, and Vercel AI SDK bindings. Crossmint works with any framework via its API and SDK.

Consider who’s behind the platform. The agent wallet market is consolidating fast. Privy was acquired by Stripe in June 2025. Dynamic was acquired by Fireblocks in October 2025. BVNK was acquired by Mastercard in March 2026. These don’t change the underlying product capabilities immediately, but they do shape the direction of development, pricing, and which ecosystems the product is likely to tilt toward over time. If strategic independence matters for your stack, that’s a real variable to weigh.

Building an agentic platform or product? Reach out to learn more about Crossmint’s agent wallet and payments infrastructure.

FAQs

Why can’t agents just use regular (EOA) wallets?

They technically can, but EOAs don’t provide the security properties agent use cases require. An EOA is controlled by a single private key with unconditional authority — no onchain spending limits, no owner/agent separation, no signer rotation without migrating assets. Any controls you add live in application code or in a signing service, which a bug in the agent or a compromise of the service can circumvent. Smart contract wallets encode authorization rules directly in the contract and enforce them onchain, which is why every purpose-built agent wallet product is a smart contract wallet.

What are the best agent wallets in 2026?

Crossmint is designed for teams that want both stablecoin and card payment rails with spending controls enforced onchain. Coinbase Agentic Wallets (launched February 2026, built on AgentKit and the x402 protocol) is a strong option for teams building on EVM chains and Solana with TEE-enforced controls. thirdweb is a credible EVM-focused option with broad framework support. Turnkey and Privy provide low-level signing infrastructure for teams that want to build their own agent layer on top. Among this group, Crossmint is the only one that bridges stablecoin and card network rails in a single integration.

What is the difference between an agent wallet and a regular crypto wallet?

A regular self-custodial wallet assumes a human reviews and approves each transaction through a UI. An agent wallet assumes programmatic, automated approval where an AI agent decides to transact and signs without human intervention. Agent wallets add policy layers — spending limits, recipient allowlists, rate limits — to constrain agent behavior. In a well-designed agent wallet setup, these policies are enforced by a smart contract onchain, so a bug in the agent can’t bypass them.

Can agent wallets use card networks like Visa and Mastercard?

Most agent wallets only support stablecoin and crypto payments. Crossmint is the exception: agents on Crossmint can transact over stablecoin rails or over card network rails (Visa, Mastercard) through integrations with their agentic payment protocols. Crossmint’s lobster.cash is the payment standard that exposes both rails to agents in a single flow — virtual credit cards with onchain spending limits on the card side, USDC wallets with human approval flows on the stablecoin side.

What are the advantages of stablecoin rails for agent payments?

Stablecoin transactions on Layer 2 networks are low-cost, settle in seconds, and operate 24/7. This makes them ideal for the kinds of payments agents typically make: micropayments for API calls, compute purchases, data access, and high-frequency transactions. Card networks carry higher fees and settle on banking timelines, but they’re still necessary where merchants don’t accept crypto. The best platforms give agents access to both.

How much do agent wallet platforms cost?

Pricing varies across platforms, from open-source SDKs (Coinbase AgentKit) to enterprise licensing (Turnkey, Crossmint). Most platforms charge blockchain gas fees on top of base pricing. Stablecoin transfers on Layer 2 networks are generally low-cost. Crossmint offers a free tier covering 1,000 monthly active wallets.

What should I look for when evaluating agent wallets?

Architecture (smart contract wallet with onchain enforcement, or EOA/signing service with off-chain policy?), payment rails (stablecoin-only or card networks too?), transaction cost and speed, spending controls (per-transaction, rolling caps, allowlists), and framework compatibility with your AI stack.