Simulate a 402 Flow

Compose a request → receive 402 Payment Required → settle → retry for 200 OK without leaving the browser.

Flow visualiser

Watch the HTTP conversation animate between request, 402 response, payment, and successful retry.

Request 402 → Payment 200 OK

HTTP request


              

              

                
HTTP response

                

              

            

            
            
Calibrate price per request, then trigger settlement to measure latency and unlock the resource.

            

              

                0 sats
                Total sats paid
              

              

                0 ms
                Avg latency
              

              

                0
                Errors simulated
              

            

          

        

      


      
      

        
When HTTP 402 shines for each rail

        

          

            
Lightning invoices

            
Use for real-time, per-request access where milliseconds matter and retries should feel automatic.

            
    
              
  • Interactive APIs and AI inference where responses unlock immediately
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  • High-volume content metering without batching delays
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  • Programmable receipts that clients can settle and verify instantly
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On-chain (unconfirmed)

            
Useful when zero-conf acceptance is acceptable - think trusted partners or low-value unlocks needing on-chain provenance.

            
    
              
  • Token-gated downloads where recording an on-chain payment ID matters
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  • Enterprise integrations that watch for mempool broadcasts before granting access
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  • Hybrid flows that upgrade to Lightning after an initial on-chain handshake
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On-chain (confirmed)

            
Choose when regulatory or risk requirements demand block confirmation before fulfilling the request.

            
    
              
  • High-value API calls settling large invoices or legal documents
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  • Data room unlocks where audit trails must survive decades
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  • Settlement checkpoints that delay delivery until ≥1 block (~10 minutes)
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