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UNSUPPORTED_CHAIN

Message. chainId is not supported

Hint. Re-fetch the 402 response and sign against the advertised chainId.

Wire shape

{
  "error": {
    "code": "UNSUPPORTED_CHAIN",
    "message": "chainId is not supported",
    "hint": "Re-fetch the 402 response and sign against the advertised chainId.",
    "docsUrl": "https://docs.tollgatepay.com/errors/unsupported-chain"
  }
}

Canonical URL

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

Related codes