Remote paid MCP server compatible with withX402Client: NOVA (x402, USDC on Base mainnet)

[jessicaespinal777-cloud]

Hi all, I'm Jessica. I built NOVA, a remote MCP server whose paid tools follow the same x402 MCP transport spec as the examples/x402-mcp demo. That means an agent wrapped with withX402Client should be able to pay for them without custom code.

Endpoint: https://nova-agent-output-recovery.onrender.com/mcp (stateless Streamable HTTP)

• nova_catalog: free, lists each tool with its price and an example input
• recover_agent_output, $0.01: repairs malformed LLM/tool-call JSON and validates it against an optional JSON Schema
• company_intelligence_report, $0.25: source-linked company profile from a public website
• cited_research_brief, $0.99: research memo with 5–8 cited public sources

An unpaid tools/call returns the PaymentRequired object. Retrying with _meta["x402/payment"] settles the payment before the tool runs. One difference from the demo: NOVA settles real USDC on Base mainnet (eip155:8453), not Base Sepolia, so the client's network config needs to allow that.

It's listed on Glama: https://glama.ai/mcp/connectors/io.github.jessicaespinal777-cloud/nova

If anyone tries it with withX402Client, I'd really like to hear whether the flow works end to end, or what breaks.