402

402Signal

Paid APIs go dark. We check before you pay them.

What you get

You pay $0.01 USDC. We look for a live paid API that matches what you asked for. If it answers with a real payment challenge, you get the URL. If nothing is up, we say so. Same price either way.

How to use it

  1. Type what you need, or paste a URL you already have.
  2. Pay $0.01 USDC on Base in this browser, or pay Base / Solana / Algorand from an agent.
  3. We probe. You get a live URL or an honest miss.

Find a live URL

Optional URL: if you already have one, we will check that it is actually up.

Show technical details

POST /route body. url stays optional. Protocol amount is 10000 (USDC, 6 decimals). That is one cent.

request preview, actual POST body


            
            
          

        

      


      

      

        
For agents

        
POST https://402signal.com/route with a need, then pay the 402.

        
POST https://402signal.com/route
{"need":"erc20 token balance"}

        
openapi.json · .well-known/x402.json · mcp.json