When you set up x402 to accept payments, one of the first real decisions you face is which blockchain network to settle on. The two most common options today are Base and Solana. Both are fast, both are cheap, and both have real facilitator support — but they come from different technical traditions and have different tradeoffs worth understanding before you commit.
Base is a Layer 2 network built on Ethereum and operated by Coinbase. That parentage matters for x402 specifically: Coinbase built the protocol, ships the reference facilitator, and runs the most mature x402 tooling — all of which targets Base first. If you follow the official x402 getting-started documentation, you'll be on Base by default.
Base inherits Ethereum's security model (transactions are ultimately anchored to Ethereum mainnet) and uses EVM-compatible smart contracts, which means a large pool of existing developer tooling works with it out of the box. Transaction fees on Base are typically fractions of a cent — cheap enough for micropayments to make economic sense. Finality is fast, though not as fast as Solana's.
For most developers starting with x402 today, Base is the path of least resistance: best documentation, most facilitator support, most reference implementations to learn from.
Solana takes a different architectural approach — a single high-throughput chain rather than an Ethereum Layer 2, with block times around 400 milliseconds and transaction costs of roughly $0.00025. For x402 use cases involving very high transaction volumes or where latency genuinely matters (an AI agent waiting for payment confirmation before proceeding), Solana's speed advantage is real and measurable.
x402 on Solana has grown quickly since the protocol expanded multi-chain. The Solana Foundation has actively promoted x402 as infrastructure for the agent economy on their network, and transaction volumes have reached tens of millions since launch. Facilitator options for Solana are developing, though the ecosystem is slightly less mature than Base's.
| Base | Solana | |
|---|---|---|
| Typical tx fee | <$0.01 | ~$0.00025 |
| Finality speed | Fast (seconds) | Very fast (~400ms) |
| x402 facilitator support | Most mature (Coinbase CDP) | Growing, slightly less mature |
| Documentation quality | Best — Coinbase reference docs | Good, improving |
| Best for | Starting out, EVM-familiar teams | Very high volume, latency-sensitive |
For most use cases at realistic early-stage volumes, the difference between Base and Solana in terms of fees and speed is not material. A payment that costs $0.001 versus $0.00025 doesn't move the needle on a business that's processing hundreds or even thousands of transactions a day. You'd need to be operating at genuinely large scale — millions of transactions per day — for the fee difference to be meaningful.
Where the choice does matter: if your team already has strong Ethereum/EVM knowledge, Base is a natural fit. If you're building specifically in the Solana ecosystem, or if you expect genuinely extreme transaction volumes with latency requirements, Solana makes more sense. And if you're simply following the quickest path to a working integration, Base's superior documentation makes it the faster starting point.
The other practical consideration: where are your users' wallets? A USDC balance on Base and a USDC balance on Solana are separate assets — they don't move between chains automatically. Whatever network you choose, your payers need their funds on the same network to pay you.
x402 V2 added formal multi-chain support, and some facilitators now support more than one network simultaneously. As tooling matures, supporting both Base and Solana in parallel — or letting payers choose — becomes increasingly feasible. For now though, picking one and shipping something is almost always better than waiting for a perfect multi-chain implementation.
Network fees and facilitator support change frequently. Always verify current numbers directly with your chosen facilitator before making architecture decisions.