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UNSUPPORTED_CHAIN_TESTNET

Message. Facilitator is in testnet mode — only Base Sepolia (chainId 84532) is accepted

Hint. Sign IOUs against chainId 84532 (Base Sepolia) and use testnet USDC. See /docs/test-mode.

Wire shape

{
  "error": {
    "code": "UNSUPPORTED_CHAIN_TESTNET",
    "message": "Facilitator is in testnet mode — only Base Sepolia (chainId 84532) is accepted",
    "hint": "Sign IOUs against chainId 84532 (Base Sepolia) and use testnet USDC. See /docs/test-mode.",
    "docsUrl": "https://docs.tollgatepay.com/errors/unsupported-chain-testnet"
  }
}

Canonical URL

https://docs.tollgatepay.com/errors/unsupported-chain-testnet — this URL is hard-coded into the 402/403/451 docsUrl field. It is stable; renaming the slug requires a migration plan.

Related codes