Arc and Solana are two blockchains that developers consider for AI agent payments, and they take different approaches. Arc uses USDC as its native gas token and describes "sub-second deterministic finality," with Circle publishing reference code for agent nanopayments on Arc (Arc docs; Circle). Solana has a large agent tooling ecosystem, including Solana Agent Kit with 60+ actions (Solana Agent Kit).
​

This article compares them on the factors that matter for agents. It does not pick a winner: the right chain depends on the payment pattern.
​

Arc and Solana differ most on gas model and ecosystem. Arc charges gas in USDC, so an agent can hold one stablecoin for both payments and fees. Solana uses SOL for fees and has a mature set of agent toolkits and protocols. Both target fast confirmation for frequent, small payments.
​

Arc fits agent payments when an agent should hold only dollars and pay many small amounts, such as metered API calls or compute. With USDC as gas, the agent does not need a second, volatile token for fees, which simplifies budgeting and accounting for the agent's wallet.
​

Arc's site positions the network for "agentic economic activity," letting agents "coordinate, contract, and settle value in real time" (Arc). Circle's sample shows buyer and seller wallets with a payment agent settling in USDC (Circle).
​

Solana fits agent payments when the agent also needs to trade, lend or interact with Solana's DeFi protocols, or when a team already builds on Solana. Toolkits expose swaps and protocol actions from Jupiter, Orca, Raydium and Meteora, so a payment agent can convert tokens before paying.
​

See Solana Agent Kit explained for the toolkit and x402 for the HTTP payment pattern used by agents.
​

One agent can use both chains if its payment logic is portable. Eco's Sauce SDK supports building and sending on Arc and Solana, and the same SauceScript program compiles to EVM and Solana bytecode, so a pay-within-a-cap program can run on either chain (Sauce docs; Sauce on GitHub). Each run is one transaction on one chain.
​

Moving stablecoins between the chains is a separate cross-chain step; see cross-chain agent payments.
​

AI agent payments put different demands on a blockchain than payments made by people. Before comparing Arc and Solana, it helps to list what an agent payment actually needs, because the right chain depends on which of these matter most for a given agent.

Arc and Solana answer these differently. Neither answers all of them best, which is why this comparison describes fit rather than picking a winner.
​

The clearest way to choose is to start from the payment pattern, not the chain. Four common patterns:
​

An agent pays per request or per unit of compute, many times a day, in dollars. Holding only USDC and paying fees in USDC keeps the agent's wallet simple. This pattern lines up with Arc's design and with Circle's nanopayments sample on Arc Testnet. It also works on Solana if the agent keeps a SOL balance for fees and someone monitors it.
​

An agent receives one token and must pay in another, so it swaps first. Access to liquid swap venues matters most here. Solana's toolkits expose swaps through protocols such as Jupiter, which suits this pattern. On any chain, the swap should carry a minimum received so the payment amount is guaranteed.
​

Two agents pay each other for services. Both sides need compatible wallets and a shared payment standard. HTTP-based patterns such as x402 let an agent pay for a resource as part of a web request; see x402 explained. The chain matters less than whether both agents support the same standard on it.
​

A company funds many agents from a central treasury and needs to top them up and track spend. Here the deciding factors are where the treasury already holds stablecoins and how easily funds move between chains. See AI agents for stablecoin treasury.
​

For payment agents, the stablecoin matters as much as the chain. Arc is built around USDC as both the payment asset and the fee asset. On Solana, agents typically pay in a stablecoin such as USDC and pay fees in SOL. In both cases, the agent's limits should name the exact token contract it may use, since tokens with similar names exist on most chains. If the agent's counterparties expect a particular stablecoin, that preference can matter more than any difference between the chains themselves.
​

The gas token question is more practical than it looks. An agent that pays fees in a volatile token needs two balances: the stablecoin it spends and the native token for fees. If the native token balance runs out, the agent cannot pay at all, even with plenty of stablecoins. Someone has to monitor and refill it, and accounting has to track two assets.
​

An agent on a chain where fees are paid in the same stablecoin it spends has one balance to watch. That is the core of Arc's appeal for payment agents. On chains with a separate gas token, teams handle the same problem with fee sponsorship, relayers or a small reserve of the native token that monitoring tops up. Each approach works; the question is which one the team wants to operate.
​

Whichever chain an agent uses, its payment limits should be enforced outside the model. The options are similar on both:

Eco's Sauce SDK provides the fourth option on both chains. It supports building and sending on Arc and Solana, among others, and the same SauceScript program compiles to EVM and Solana bytecode (Sauce docs; Sauce on GitHub). The Sauce README notes that the same pay program runs on Base and Solana unchanged (Sauce on GitHub). Sauce's recipes include paying a list within a cap and native USDC on Arc (Sauce recipes). Each run is one transaction on one chain; moving funds between chains is a separate step.
​

Once agents pay on one or more chains, someone has to watch what they spend. Good monitoring looks the same on Arc and Solana, even though the tools differ.

Reverted transactions deserve special attention when limits live in the transaction. A revert means a check did its job; a run of reverts means the agent keeps proposing something outside its rules, and the cause should be found.
​

The most common mistake is choosing a chain for its headline features and discovering later that the agent's counterparties are elsewhere. Payments only work if the payee can receive on that chain. The second is underestimating operations: a separate gas token, bridging between chains and monitoring all take ongoing work. The third is assuming the chain provides the safety. Fast settlement makes good payments fast and bad payments fast; limits still have to come from the wallet, policy or transaction.
​

A short decision guide:

Check each network's current documentation before building, since fee models, tooling and ecosystem change over time.
​

Neither is better in general. Arc suits dollar-only agents paying gas in USDC; Solana suits agents that also use Solana DeFi.
​

USDC, per Arc's documentation.
​

Yes, to pay transaction fees, unless the setup uses fee sponsorship or a relayer that pays fees on its behalf.
​

Yes. Arc is an EVM chain, per its documentation, so Ethereum tooling and Solidity apply.
​

Payment logic can be portable. With Sauce, one SauceScript program compiles for both EVM and Solana. Wallets and keys differ per chain.
​

Solana has an established set of agent toolkits, such as Solana Agent Kit. Arc is newer, with Circle publishing reference code for agent payments. Check each ecosystem's current tooling for your use case.
​

Yes. Both ecosystems offer test networks. Run the agent there with test funds, try payments that should be refused, and confirm the limits hold before it touches real money.
​

Sources: Arc, Circle, Solana and project documentation linked inline, accessed November 2026.
​