solana/book/src/jsonrpc-api.md

JSON RPC API
===

Solana nodes accept HTTP requests using the [JSON-RPC 2.0](https://www.jsonrpc.org/specification) specification.

To interact with a Solana node inside a JavaScript application, use the [solana-web3.js](https://github.com/solana-labs/solana-web3.js) library, which gives a convenient interface for the RPC methods.

RPC HTTP Endpoint
---

**Default port:** 8899
eg. http://localhost:8899, http://192.168.1.88:8899

RPC PubSub WebSocket Endpoint
---

**Default port:** 8900
eg. ws://localhost:8900, http://192.168.1.88:8900


Methods
---

* [confirmTransaction](#confirmtransaction)
* [getAccountInfo](#getaccountinfo)
* [getBalance](#getbalance)
* [getRecentBlockhash](#getrecentblockhash)
* [getSignatureStatus](#getsignaturestatus)
* [getTransactionCount](#gettransactioncount)
* [requestAirdrop](#requestairdrop)
* [sendTransaction](#sendtransaction)
* [startSubscriptionChannel](#startsubscriptionchannel)

* [Subscription Websocket](#subscription-websocket)
  * [accountSubscribe](#accountsubscribe)
  * [accountUnsubscribe](#accountunsubscribe)
  * [programSubscribe](#programsubscribe)
  * [programUnsubscribe](#programunsubscribe)
  * [signatureSubscribe](#signaturesubscribe)
  * [signatureUnsubscribe](#signatureunsubscribe)

Request Formatting
---

To make a JSON-RPC request, send an HTTP POST request with a `Content-Type: application/json` header. The JSON request data should contain 4 fields:

* `jsonrpc`, set to `"2.0"`
* `id`, a unique client-generated identifying integer
* `method`, a string containing the method to be invoked
* `params`, a JSON array of ordered parameter values

Example using curl:
```bash
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0", "id":1, "method":"getBalance", "params":["83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri"]}' 192.168.1.88:8899
```

The response output will be a JSON object with the following fields:

* `jsonrpc`, matching the request specification
* `id`, matching the request identifier
* `result`, requested data or success confirmation

Requests can be sent in batches by sending an array of JSON-RPC request objects as the data for a single POST.

Definitions
---

* Hash: A SHA-256 hash of a chunk of data.
* Pubkey: The public key of a Ed25519 key-pair.
* Signature: An Ed25519 signature of a chunk of data.
* Transaction: A Solana instruction signed by a client key-pair.

JSON RPC API Reference
---

### confirmTransaction
Returns a transaction receipt

##### Parameters:
* `string` - Signature of Transaction to confirm, as base-58 encoded string

##### Results:
* `boolean` - Transaction status, true if Transaction is confirmed

##### Example:
```bash
// Request
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0", "id":1, "method":"confirmTransaction", "params":["5VERv8NMvzbJMEkV8xnrLkEaWRtSz9CosKDYjCJjBRnbJLgp8uirBgmQpjKhoR4tjF3ZpRzrFmBV6UjKdiSZkQUW"]}' http://localhost:8899

// Result
{"jsonrpc":"2.0","result":true,"id":1}
```

---

### getBalance
Returns the balance of the account of provided Pubkey

##### Parameters:
* `string` - Pubkey of account to query, as base-58 encoded string

##### Results:
* `integer` - quantity, as a signed 64-bit integer

##### Example:
```bash
// Request
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0", "id":1, "method":"getBalance", "params":["83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri"]}' http://localhost:8899

// Result
{"jsonrpc":"2.0","result":0,"id":1}
```

---

### getAccountInfo
Returns all information associated with the account of provided Pubkey

##### Parameters:
* `string` - Pubkey of account to query, as base-58 encoded string

##### Results:
The result field will be a JSON object with the following sub fields:

* `lamports`, number of lamports assigned to this account, as a signed 64-bit integer
* `owner`, array of 32 bytes representing the program this account has been assigned to
* `userdata`, array of bytes representing any userdata associated with the account
* `executable`, boolean indicating if the account contains a program (and is strictly read-only)
* `loader`, array of 32 bytes representing the loader for this program (if `executable`), otherwise all

##### Example:
```bash
// Request
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0", "id":1, "method":"getAccountInfo", "params":["2gVkYWexTHR5Hb2aLeQN3tnngvWzisFKXDUPrgMHpdST"]}' http://localhost:8899

// Result
{"jsonrpc":"2.0","result":{"executable":false,"loader":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"owner":[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"lamports":1,"userdata":[3,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,20,0,0,0,0,0,0,0,50,48,53,48,45,48,49,45,48,49,84,48,48,58,48,48,58,48,48,90,252,10,7,28,246,140,88,177,98,82,10,227,89,81,18,30,194,101,199,16,11,73,133,20,246,62,114,39,20,113,189,32,50,0,0,0,0,0,0,0,247,15,36,102,167,83,225,42,133,127,82,34,36,224,207,130,109,230,224,188,163,33,213,13,5,117,211,251,65,159,197,51,0,0,0,0,0,0]},"id":1}
```

---

### getRecentBlockhash
Returns a recent block hash from the ledger

##### Parameters:
None

##### Results:
* `string` - a Hash as base-58 encoded string

##### Example:
```bash
// Request
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1, "method":"getRecentBlockhash"}' http://localhost:8899

// Result
{"jsonrpc":"2.0","result":"GH7ome3EiwEr7tu9JuTh2dpYWBJK3z69Xm1ZE3MEE6JC","id":1}
```

---

### getSignatureStatus
Returns the status of a given signature.  This method is similar to
[confirmTransaction](#confirmtransaction) but provides more resolution for error
events.

##### Parameters:
* `string` - Signature of Transaction to confirm, as base-58 encoded string

##### Results:
* `string` - Transaction status:
    * `Confirmed` - Transaction was successful
    * `SignatureNotFound` - Unknown transaction
    * `ProgramRuntimeError` - An error occurred in the program that processed this Transaction
    * `AccountInUse` - Another Transaction had a write lock one of the Accounts specified in this Transaction.  The Transaction may succeed if retried
    * `GenericFailure` - Some other error occurred.  **Note**: In the future new Transaction statuses may be added to this list.  It's safe to assume that all new statuses will be more specific error conditions that previously presented as `GenericFailure`

##### Example:
```bash
// Request
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0", "id":1, "method":"getSignatureStatus", "params":["5VERv8NMvzbJMEkV8xnrLkEaWRtSz9CosKDYjCJjBRnbJLgp8uirBgmQpjKhoR4tjF3ZpRzrFmBV6UjKdiSZkQUW"]}' http://localhost:8899

// Result
{"jsonrpc":"2.0","result":"SignatureNotFound","id":1}
```

---
### getTransactionCount
Returns the current Transaction count from the ledger

##### Parameters:
None

##### Results:
* `integer` - count, as unsigned 64-bit integer

##### Example:
```bash
// Request
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1, "method":"getTransactionCount"}' http://localhost:8899

// Result
{"jsonrpc":"2.0","result":268,"id":1}
```

---

### requestAirdrop
Requests an airdrop of lamports to a Pubkey

##### Parameters:
* `string` - Pubkey of account to receive lamports, as base-58 encoded string
* `integer` - lamports, as a signed 64-bit integer

##### Results:
* `string` - Transaction Signature of airdrop, as base-58 encoded string

##### Example:
```bash
// Request
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1, "method":"requestAirdrop", "params":["83astBRguLMdt2h5U1Tpdq5tjFoJ6noeGwaY3mDLVcri", 50]}' http://localhost:8899

// Result
{"jsonrpc":"2.0","result":"5VERv8NMvzbJMEkV8xnrLkEaWRtSz9CosKDYjCJjBRnbJLgp8uirBgmQpjKhoR4tjF3ZpRzrFmBV6UjKdiSZkQUW","id":1}
```

---

### sendTransaction
Creates new transaction

##### Parameters:
* `array` - array of octets containing a fully-signed Transaction

##### Results:
* `string` - Transaction Signature, as base-58 encoded string

##### Example:
```bash
// Request
curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","id":1, "method":"sendTransaction", "params":[[61, 98, 55, 49, 15, 187, 41, 215, 176, 49, 234, 229, 228, 77, 129, 221, 239, 88, 145, 227, 81, 158, 223, 123, 14, 229, 235, 247, 191, 115, 199, 71, 121, 17, 32, 67, 63, 209, 239, 160, 161, 2, 94, 105, 48, 159, 235, 235, 93, 98, 172, 97, 63, 197, 160, 164, 192, 20, 92, 111, 57, 145, 251, 6, 40, 240, 124, 194, 149, 155, 16, 138, 31, 113, 119, 101, 212, 128, 103, 78, 191, 80, 182, 234, 216, 21, 121, 243, 35, 100, 122, 68, 47, 57, 13, 39, 0, 0, 0, 0, 50, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 50, 0, 0, 0, 0, 0, 0, 0, 40, 240, 124, 194, 149, 155, 16, 138, 31, 113, 119, 101, 212, 128, 103, 78, 191, 80, 182, 234, 216, 21, 121, 243, 35, 100, 122, 68, 47, 57, 11, 12, 106, 49, 74, 226, 201, 16, 161, 192, 28, 84, 124, 97, 190, 201, 171, 186, 6, 18, 70, 142, 89, 185, 176, 154, 115, 61, 26, 163, 77, 1, 88, 98, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]}' http://localhost:8899

// Result
{"jsonrpc":"2.0","result":"2EBVM6cB8vAAD93Ktr6Vd8p67XPbQzCJX47MpReuiCXJAtcjaxpvWpcg9Ege1Nr5Tk3a2GFrByT7WPBjdsTycY9b","id":1}
```

---

### Subscription Websocket
After connect to the RPC PubSub websocket at `ws://<ADDRESS>/`:
- Submit subscription requests to the websocket using the methods below
- Multiple subscriptions may be active at once

---

### accountSubscribe
Subscribe to an account to receive notifications when the userdata for a given account public key changes

##### Parameters:
* `string` - account Pubkey, as base-58 encoded string

##### Results:
* `integer` - Subscription id (needed to unsubscribe)

##### Example:
```bash
// Request
{"jsonrpc":"2.0", "id":1, "method":"accountSubscribe", "params":["CM78CPUeXjn8o3yroDHxUtKsZZgoy4GPkPPXfouKNH12"]}

// Result
{"jsonrpc": "2.0","result": 0,"id": 1}
```

##### Notification Format:
```bash
{"jsonrpc": "2.0","method": "accountNotification", "params": {"result": {"executable":false,"loader":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"owner":[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"lamports":1,"userdata":[3,0,0,0,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,0,20,0,0,0,0,0,0,0,50,48,53,48,45,48,49,45,48,49,84,48,48,58,48,48,58,48,48,90,252,10,7,28,246,140,88,177,98,82,10,227,89,81,18,30,194,101,199,16,11,73,133,20,246,62,114,39,20,113,189,32,50,0,0,0,0,0,0,0,247,15,36,102,167,83,225,42,133,127,82,34,36,224,207,130,109,230,224,188,163,33,213,13,5,117,211,251,65,159,197,51,0,0,0,0,0,0]},"subscription":0}}
```

---

### accountUnsubscribe
Unsubscribe from account userdata change notifications

##### Parameters:
* `integer` - id of account Subscription to cancel

##### Results:
* `bool` - unsubscribe success message

##### Example:
```bash
// Request
{"jsonrpc":"2.0", "id":1, "method":"accountUnsubscribe", "params":[0]}

// Result
{"jsonrpc": "2.0","result": true,"id": 1}
```

---

### programSubscribe
Subscribe to a program to receive notifications when the userdata for a given account owned by the program changes

##### Parameters:
* `string` - program_id Pubkey, as base-58 encoded string

##### Results:
* `integer` - Subscription id (needed to unsubscribe)

##### Example:
```bash
// Request
{"jsonrpc":"2.0", "id":1, "method":"programSubscribe", "params":["9gZbPtbtHrs6hEWgd6MbVY9VPFtS5Z8xKtnYwA2NynHV"]}

// Result
{"jsonrpc": "2.0","result": 0,"id": 1}
```

##### Notification Format:
* `string` - account Pubkey, as base-58 encoded string
* `object` - account info JSON object (see [getAccountInfo](#getaccountinfo) for field details)
```bash
{"jsonrpc":"2.0","method":"programNotification","params":{{"result":["8Rshv2oMkPu5E4opXTRyuyBeZBqQ4S477VG26wUTFxUM",{"executable":false,"lamports":1,"owner":[129,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"userdata":[1,1,1,0,0,0,0,0,0,0,20,0,0,0,0,0,0,0,50,48,49,56,45,49,50,45,50,52,84,50,51,58,53,57,58,48,48,90,235,233,39,152,15,44,117,176,41,89,100,86,45,61,2,44,251,46,212,37,35,118,163,189,247,84,27,235,178,62,55,89,0,0,0,0,50,0,0,0,0,0,0,0,235,233,39,152,15,44,117,176,41,89,100,86,45,61,2,44,251,46,212,37,35,118,163,189,247,84,27,235,178,62,45,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}],"subscription":0}}
```

---

### programUnsubscribe
Unsubscribe from program-owned account change notifications

##### Parameters:
* `integer` - id of account Subscription to cancel

##### Results:
* `bool` - unsubscribe success message

##### Example:
```bash
// Request
{"jsonrpc":"2.0", "id":1, "method":"programUnsubscribe", "params":[0]}

// Result
{"jsonrpc": "2.0","result": true,"id": 1}
```

---

### signatureSubscribe
Subscribe to a transaction signature to receive notification when the transaction is confirmed
On `signatureNotification`, the subscription is automatically cancelled

##### Parameters:
* `string` - Transaction Signature, as base-58 encoded string

##### Results:
* `integer` - subscription id (needed to unsubscribe)

##### Example:
```bash
// Request
{"jsonrpc":"2.0", "id":1, "method":"signatureSubscribe", "params":["2EBVM6cB8vAAD93Ktr6Vd8p67XPbQzCJX47MpReuiCXJAtcjaxpvWpcg9Ege1Nr5Tk3a2GFrByT7WPBjdsTycY9b"]}

// Result
{"jsonrpc": "2.0","result": 0,"id": 1}
```

##### Notification Format:
```bash
{"jsonrpc": "2.0","method": "signatureNotification", "params": {"result": "Confirmed","subscription":0}}
```

---

### signatureUnsubscribe
Unsubscribe from signature confirmation notification

##### Parameters:
* `integer` - subscription id to cancel

##### Results:
* `bool` - unsubscribe success message

##### Example:
```bash
// Request
{"jsonrpc":"2.0", "id":1, "method":"signatureUnsubscribe", "params":[0]}

// Result
{"jsonrpc": "2.0","result": true,"id": 1}
```