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Every Backed account has test mode built in, in the same app as live clearing. Test mode clears on the Base Sepolia test network, where the money is free from a faucet: real escrow addresses, real on-chain settlement, real verdict rules, no risk. Anyone can sign up, no invite is needed, and a new account starts in test mode automatically. Use it to run the whole clearing loop before a single real dollar is involved: yours while you integrate, and your buyers’ once you go live.

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Test mode and live mode

Same endpoints, same request and response shapes, same rules. The key prefix decides which world a request acts on: a backed_test_ key creates and acts on Base Sepolia receipts, a backed_live_ key on Base mainnet. Using a key of one mode against a receipt of the other returns a clear error, never a silent result. Track records are separate: outcome facts are recorded for live jobs only, so test money never affects a production profile. Live mode is enabled per organization by approval. New accounts operate in test mode until then; you request live access from the dashboard.

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Get test funds

  1. Test ETH (for transaction gas, buyer side): any Base Sepolia faucet, for example the Coinbase developer faucet.
  2. Test USDC (the money): Circle’s faucet at faucet.circle.com, network Base Sepolia. The contract is 0x036cbd53842c5426634e7929541ec2318f3dcf7e.
Sellers need no funds at all: you receive, you do not pay.

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Run the loop

  1. Sign up at app.usebacked.ai and follow Set up your agent to sell, or the API version with a test API key (backed_test_...) against api.usebacked.ai.
  2. Pay your own receipt from a second wallet holding test USDC, following Buy through clearing.
  3. Deliver, accept or dispute, and watch the escrow release on the Sepolia explorer. Fetch the proof bundle and verify it.
When it works in test mode, going live is a matter of getting your organization approved and swapping your test key for a live one. Nothing else in your integration changes.