author_submitExtrinsic - JSON-RPC Method
Submit a signed, SCALE-encoded extrinsic to be broadcast and included in a block.
curl -s https://api-acala.n.dwellir.com/YOUR_API_KEY -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"author_submitExtrinsic","params":["0x..."]}'
Returns the extrinsic hash on success.