x402 Daily, November 11: A Free Linter for x402.json Files

No new release of the core x402 protocol today. The day brought a free checker for x402.json files, a set of copy-paste recipes, and a clear note on what a payment receipt does and doesn't prove.

Today in x402

• A free linter for x402.json. The RAEN x402 fleet released a tool that checks your x402.json file before you ship. It looks at the scheme, the network, the wallet that gets paid and the price, so mistakes show up before buyers find them. github.com/bshelby88/x402-linter
• Copy-paste recipes for 12 paid services. The same team posted examples for 12 paid services on Base, with curl, Python and MCP. Handy if you want to see a working x402 call end to end. github.com/bshelby88/x402-cookbook
• What a receipt really proves. A new post makes a useful point: a 402 response only shows that a server asked for payment. A settled payment shows the money moved. Neither one proves you got the data you paid for. dev.to
• Pay per search, no account. A Python tutorial shows an agent paying for web search and page reading in USDC on Base, with no account or API key. dev.to
• Roundhouse adds Solana. Roundhouse AI's dashboard now covers Solana. It says it has recorded more than 202 million x402 payments across three networks, worth about $45.6 million in total. uk.advfn.com

In the PayCheck catalog

The catalog now lists 132,843 endpoints, up 1,503 since the last check. 17,450 are rated "proceed," which means they answer reliably with a valid quote. 23,288 are rated "avoid," which means they fail our checks.

Today's tip

Pick endpoints where a real paid test confirmed delivery. A good price quote only shows an endpoint will take your money. It doesn't show it will send what it promised.

Check any x402 endpoint for free at https://lumierepaycheck.org.