/wallet/unfreezebalance

Legacy still active: Unlike freezebalance, this endpoint still works after Stake 2.0 is enabled — UnfreezeBalanceActuator has no supportUnfreezeDelay gate, and legacy V1 positions still need to be unfrozen through it. For new use cases, use /wallet/unfreezebalancev2.

Unfreeze matured Stake 1.0 assets.

• Source: framework/src/main/java/org/tron/core/services/http/UnFreezeBalanceServlet.java
• Method: POST
• Contract: protocol.UnfreezeBalanceContract

Request parameters

Field	Type	Required	Description
owner_address	string	Yes	Account to unfreeze
resource	enum	No	BANDWIDTH / ENERGY, default BANDWIDTH
receiver_address	string	No	Delegation target address (when undelegating)
permission_id	int32	No	Multi-sig permission ID
visible	bool	No	Address format

Example:

curl --request POST \
     --url https://nile.trongrid.io/wallet/unfreezebalance \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
{
  "owner_address": "41dd791d6b49e190062d650e6a23c575510d35f2f9",
  "resource":      "BANDWIDTH"
}
'

Response

Before construction, the validator checks that the account has matured V1 freeze/delegation records. The example account has no V1 freeze on BANDWIDTH; the actual Nile response is:

{"Error": "class org.tron.core.exception.ContractValidateException : no frozenBalance(BANDWIDTH)"}

When validation passes, returns an unsigned protocol.Transaction. Structure outline (txID / ref_block_* / expiration / timestamp / raw_data_hex semantics are the same as /wallet/createtransaction):

{
  "visible": false,
  "txID": "<computed from raw_data>",
  "raw_data": {
    "contract": [
      {
        "parameter": {
          "value": {
              "owner_address": "41dd791d6b49e190062d650e6a23c575510d35f2f9",
              "resource":      "BANDWIDTH"
          },
          "type_url": "type.googleapis.com/protocol.UnfreezeBalanceContract"
        },
        "type": "UnfreezeBalanceContract"
      }
    ],
    "ref_block_bytes": "<latest solidified block at construction time>",
    "ref_block_hash":  "<latest solidified block at construction time>",
    "expiration":      "<timestamp + 60_000>",
    "timestamp":       "<construction moment>"
  },
  "raw_data_hex": "<protobuf encoding of raw_data>"
}

Error responses

Trigger	Response
Request body exceeds node.maxMessageSize	{"Error": "class java.lang.Exception : body size is too big, the limit is <N>"}
Request body is not valid JSON / field type mismatch	{"Error": "class com.alibaba.fastjson.JSONException : <parser info>"} or {"Error": "class org.tron.core.services.http.JsonFormat$ParseException : <decoder info>"}
owner_address is not a valid 21-byte address	{"Error": "class org.tron.core.exception.ContractValidateException : Invalid address"}
owner_address does not exist on chain	{"Error": "class org.tron.core.exception.ContractValidateException : Account[<addr>] does not exist"}
receiver_address == owner_address	{"Error": "class org.tron.core.exception.ContractValidateException : receiverAddress must not be the same as ownerAddress"}
receiver_address is not a valid 21-byte address	{"Error": "class org.tron.core.exception.ContractValidateException : Invalid receiverAddress"}
receiver_address is set but AllowTvmConstantinople=0 and the receiver account does not exist	{"Error": "class org.tron.core.exception.ContractValidateException : Receiver Account[<addr>] does not exist"}
receiver_address is set but no delegation record exists from owner→receiver	{"Error": "class org.tron.core.exception.ContractValidateException : delegated Resource does not exist"}
Undelegating BANDWIDTH but the delegation record's bandwidth frozen amount is 0	{"Error": "class org.tron.core.exception.ContractValidateException : no delegatedFrozenBalance(BANDWIDTH)"}
Undelegating ENERGY but the delegation record's energy frozen amount is 0	{"Error": "class org.tron.core.exception.ContractValidateException : no delegateFrozenBalance(Energy)"}
Receiver's used resource is less than the delegated amount when undelegating (invariant violation)	{"Error": "class org.tron.core.exception.ContractValidateException : AcquiredDelegatedFrozenBalanceFor<Resource>[<X>] < delegated<Resource>[<Y>]"}
Undelegating but the delegation has not yet matured	{"Error": "class org.tron.core.exception.ContractValidateException : It's not time to unfreeze."}
Self-unfreeze BANDWIDTH but no BANDWIDTH freeze on the account	{"Error": "class org.tron.core.exception.ContractValidateException : no frozenBalance(BANDWIDTH)"}
Self-unfreeze BANDWIDTH but none of the records have matured	{"Error": "class org.tron.core.exception.ContractValidateException : It's not time to unfreeze(BANDWIDTH)."}
Self-unfreeze ENERGY but no ENERGY freeze on the account	{"Error": "class org.tron.core.exception.ContractValidateException : no frozenBalance(Energy)"}
Self-unfreeze ENERGY but not yet matured	{"Error": "class org.tron.core.exception.ContractValidateException : It's not time to unfreeze(Energy)."}
Self-unfreeze TRON_POWER (only when AllowNewResourceModel is enabled) but no TronPower freeze / not yet matured	{"Error": "class org.tron.core.exception.ContractValidateException : no frozenBalance(TronPower)"} or ... It's not time to unfreeze(TronPower).
Invalid resource	{"Error": "class org.tron.core.exception.ContractValidateException : ResourceCode error.valid ResourceCode[BANDWIDTH、Energy]"} (with AllowNewResourceModel enabled: ... [BANDWIDTH、Energy、TRON_POWER])
Other exceptions	{"Error": "<exceptionClass> : <message>"}

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