Response validation

For an ID-bearing request, before returning an upstream response the Gateway checks its structure: the body must be valid JSON, jsonrpc must be 2.0 (relaxed only for UTXO chains), the response id must be present and match the request, and exactly one of result and error must be set.

A response that fails these checks counts as a failure for health and for the Circuit, and moves to the next candidate when the operation can be replayed safely. The id returned to you is always the id you sent, including an explicit null.

Notifications produce no JSON-RPC Response, so these response-envelope checks do not apply. HTTP 204 with no body confirms only response suppression; it does not establish successful routing or forwarding, upstream acceptance or processing, method or transaction success, or network acceptance.

These checks are structural. The Gateway does not evaluate whether a well-formed result is correct.