Solana infrastructure provider ERPC has just announced it has integrated the x402 payment protocol into JSON-RPC access on the Solana mainnet. Thanks to this new system, applications, bots, and AI agents can now pay in USDC for the specific RPC queries they need, without opening an account, creating an API key, or subscribing to a monthly package.
Instant payments without subscriptions
According to ERPC’s official statement, the new service operates as a JSON-RPC proxy running on Solana’s mainnet. When a user or software sends a regular RPC request without attached payment information, the system responds with an HTTP 402 “Payment Required” code. The client then uses the provided amount and network details to add USDC payment data on Solana; once the payment is verified, the original RPC query result is delivered.
Flexible model designed for AI and bots
The system seems particularly tailored for AI agents, analytics bots, and automated monitoring tools that consume large volumes of data at certain times but don’t need a continuous subscription. ERPC explained that in the payment verification and reconciliation process, it leverages Coinbase Developer Platform’s x402 facilitator infrastructure.
Under ERPC’s model, each Solana RPC method is assigned a different computational weight, which determines the price in US dollars, with a minimum payment of $0.001 per request. For example, simple status checks come at a lower cost, while data-heavy operations such as getProgramAccounts incur higher fees. To prevent replay attacks, the system rejects duplicate transaction signatures with an error code.
This approach marks a shift from traditional RPC service models. Until now, developers usually relied on monthly subscriptions, prepaid credits, or usage quotas. Now, payment becomes part of the API request: you make the query, see the cost, send your payment, and receive the result.
What’s new about this x402 announcement?
The x402 protocol is not brand new. Back in March 2026, Coinbase revealed that x402 had been expanded to support almost all ERC-20 tokens within the EVM ecosystem. That update aimed to make payments easier using various tokens such as USDT, DAI, or community tokens, thanks to Permit2 and gas sponsorship features. However, those changes mainly diversified payment options on EVM chains.
In a previous announcement from October 2025, ERPC had shared performance upgrades for Solana RPC, gRPC, and Shredstream endpoints, focusing on reduced latency and improved stability, but clearly noting there were no changes to pricing or authentication methods at that time. The new x402 integration, on the other hand, directly transforms the way payments and access are managed.
Educational resources provided by Eco have outlined the basic logic behind x402: stablecoin payments via HTTP 402 responses, API access without the need for accounts or credit cards, and enabling AI agents to make machine-to-machine payments. While these explain the principles of x402, ERPC’s latest announcement turns this protocol into a usable infrastructure solution on Solana RPC for the first time.
The real significance of ERPC’s announcement lies not in introducing a new protocol, but in bringing x402 into genuine use for Solana infrastructure. The pivotal question is how widely this new model will spread. Pay-per-query methods could offer flexibility for AI agents and applications with short bursts of high-volume data needs. Yet, factors like agents’ spending limits, authorization scopes, wallet security, transaction fees, and abuse prevention will shape its adoption going forward.
For now, ERPC’s move stands out as one of the first real-world examples of transitioning from the “contract and API key first, use later” paradigm to an on-demand, “pay as you go” model for accessing blockchain infrastructure.
