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Local-only interactive prototype

Payment Intent Playground

Create a reviewable USDC payment intent from agent-provided context, inspect the JSON, and move it through explicit human approval states. This demo runs only in the browser. It does not connect to a wallet, broadcast transactions, talk to any backend, or request private keys.

No wallet connection No backend calls Human keeps approval control Reviewable JSON first
Intent form

Agent request

Review before wallet action

Intent JSON

Status: draft


      

    


    

      
Read-only RPC probe

      
Arc Testnet status

      
This panel keeps the playground grounded in the expected Arc Testnet configuration while staying browser-local. It does not connect to a wallet, call a backend, or broadcast transactions.

      

        

          Expected chain ID
          5042002 (0x4cef52)
        

        

          RPC URL
          https://rpc.testnet.arc.network
        

        

          Network mode
          Read-only / no broadcast
        

      

      

    


    

      
Amount units before signing

      
USDC unit preview

      
Arc uses USDC as native gas, but ERC-20 USDC transfers still use 6-decimal token units. This local preview keeps those unit systems visible before any future wallet PR.

      

        

          ERC-20 base units
          0
        

        

          ERC-20 decimals
          6
        

        

          Native gas decimals
          18
        

      

      
    


    

      
Wallet guardrails

      
Wallet action unavailable

      
Signing stays disabled until a separate testnet-only wallet PR proves every guard. The current playground only explains why a real wallet action is blocked.

      

        

          Provider
          Not detected
        

        

          Connected address
          Not requested
        

        

          Chain gate
          Blocked
        

      

      
      
    


    

      
Local readiness checks

      
Validation summary

      
These checks summarize whether the local intent is ready for human review. They are advisory browser-only checks and never connect to a wallet or network.

      
    


    

      
Review-safe state machine

      
Status states

      
The playground uses explicit local-only states so reviewers can tell what is real today and what still needs a separate Arc Testnet wallet PR.

      
    
        
  1. draft — intent exists but is not approved.
    2. 
        
  2. ready_for_review — fields are valid enough for human review.
    3. 
        
  3. approved_local — human approved the local exercise only.
    4. 
        
  4. final_review_confirmed — final local confirmation recorded without a wallet request.
    5. 
        
  5. blocked_wallet_unavailable — signing remains disabled by guardrails.
    6. 
      

    


    

      
Manual copy for wallet PR review

      
Signing preflight report

      
This generated report summarizes the local intent, guard failures, and readiness checks that a future testnet-only wallet PR must satisfy before any signing path is enabled.

      
      
Copies the local JSON report to your clipboard only. No wallet, network, or backend call is made.

      

    


    

      
Unsigned transaction draft

      
ERC-20 transfer payload preview

      
This local preview shows the deterministic Arc Testnet USDC transaction fields a future wallet PR would ask the user to review. It is unsigned JSON only: no wallet request, gas estimate, simulation, RPC write, signing, or broadcast.

      

    


    

      
Payload consistency check

      
Unsigned draft decodes back to intent

      
This local verifier decodes the ERC-20 calldata and compares token target, native value, chain ID, recipient, and base units against the current reviewed intent before any future wallet handoff.

      
    


    

      
Wallet handoff readiness

      
Send PR blocker manifest

      
This local manifest lists every guard a separate wallet/send PR must satisfy before it can enable any wallet request. It remains a no-transaction checklist: no provider call, chain switch, signing, gas estimate, simulation, or broadcast.

      
      

    


    

      
Final review gate

      
Final confirmation, still no transaction

      
This is the last human confirmation step a future testnet send PR should reuse before opening any wallet prompt. Today it only records local review intent and keeps transaction requests disabled.

      
      
      
    


    

      

        
Local status timeline

        
What happened

        

      

      

        
Trust boundaries

        
Still not a wallet app

        
    
          
  • The agent can prepare and explain an intent, not spend funds.
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  • Every approval and final-confirmation state in this playground is local UI state.
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  • Real Arc Testnet integration must re-check chain, wallet, and contract details through current Arc docs/MCP.
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  • Use the builder readiness checklist before adding any transaction path.
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