Solana RPC
getLatestBlockhash
Returns the latest Solana blockhash required for constructing fresh transactions. Blockhashes expire after ~150 slots — fetch one just before signing to maximize the inclusion window.
POST
/
getLatestBlockhash
curl --request POST \
--url 'https://mainnet.helius-rpc.com/?api-key=' \
--header 'Content-Type: application/json' \
--data '
{
"jsonrpc": "2.0",
"id": "1",
"method": "getLatestBlockhash",
"params": [
{
"commitment": "processed",
"minContextSlot": 1000
}
]
}
'import requests
url = "https://mainnet.helius-rpc.com/?api-key="
payload = {
"jsonrpc": "2.0",
"id": "1",
"method": "getLatestBlockhash",
"params": [
{
"commitment": "processed",
"minContextSlot": 1000
}
]
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({
jsonrpc: '2.0',
id: '1',
method: 'getLatestBlockhash',
params: [{commitment: 'processed', minContextSlot: 1000}]
})
};
fetch('https://mainnet.helius-rpc.com/?api-key=', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://mainnet.helius-rpc.com/?api-key=",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'jsonrpc' => '2.0',
'id' => '1',
'method' => 'getLatestBlockhash',
'params' => [
[
'commitment' => 'processed',
'minContextSlot' => 1000
]
]
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://mainnet.helius-rpc.com/?api-key="
payload := strings.NewReader("{\n \"jsonrpc\": \"2.0\",\n \"id\": \"1\",\n \"method\": \"getLatestBlockhash\",\n \"params\": [\n {\n \"commitment\": \"processed\",\n \"minContextSlot\": 1000\n }\n ]\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://mainnet.helius-rpc.com/?api-key=")
.header("Content-Type", "application/json")
.body("{\n \"jsonrpc\": \"2.0\",\n \"id\": \"1\",\n \"method\": \"getLatestBlockhash\",\n \"params\": [\n {\n \"commitment\": \"processed\",\n \"minContextSlot\": 1000\n }\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://mainnet.helius-rpc.com/?api-key=")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"jsonrpc\": \"2.0\",\n \"id\": \"1\",\n \"method\": \"getLatestBlockhash\",\n \"params\": [\n {\n \"commitment\": \"processed\",\n \"minContextSlot\": 1000\n }\n ]\n}"
response = http.request(request)
puts response.read_body{
"jsonrpc": "2.0",
"id": "1",
"result": {
"context": {
"slot": 2792
},
"value": {
"blockhash": "EkSnNWid2cvwEVnVx9aBqawnmiCNiDgp3gUdkDPTKN1N",
"lastValidBlockHeight": 3090
}
}
}{
"jsonrpc": "2.0",
"error": {
"code": -32602,
"message": "Invalid params"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32001,
"message": "Unauthorized"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32005,
"message": "Too many requests"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32603,
"message": "Internal error"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32002,
"message": "Service unavailable"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32003,
"message": "Gateway timeout"
},
"id": "1"
}Request Parameters
string
The commitment level for the request.
confirmedfinalizedprocessed
number
The minimum slot that the request can be evaluated at.
Authorizations
Body
application/json
The JSON-RPC protocol version.
Available options:
2.0 Example:
"2.0"
A unique identifier for the request.
Example:
"1"
The name of the RPC method to invoke.
Available options:
getLatestBlockhash Example:
"getLatestBlockhash"
Optional configuration object for the request.
Show child attributes
Show child attributes
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getLatestBlockhash
curl --request POST \
--url 'https://mainnet.helius-rpc.com/?api-key=' \
--header 'Content-Type: application/json' \
--data '
{
"jsonrpc": "2.0",
"id": "1",
"method": "getLatestBlockhash",
"params": [
{
"commitment": "processed",
"minContextSlot": 1000
}
]
}
'import requests
url = "https://mainnet.helius-rpc.com/?api-key="
payload = {
"jsonrpc": "2.0",
"id": "1",
"method": "getLatestBlockhash",
"params": [
{
"commitment": "processed",
"minContextSlot": 1000
}
]
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify({
jsonrpc: '2.0',
id: '1',
method: 'getLatestBlockhash',
params: [{commitment: 'processed', minContextSlot: 1000}]
})
};
fetch('https://mainnet.helius-rpc.com/?api-key=', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://mainnet.helius-rpc.com/?api-key=",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'jsonrpc' => '2.0',
'id' => '1',
'method' => 'getLatestBlockhash',
'params' => [
[
'commitment' => 'processed',
'minContextSlot' => 1000
]
]
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://mainnet.helius-rpc.com/?api-key="
payload := strings.NewReader("{\n \"jsonrpc\": \"2.0\",\n \"id\": \"1\",\n \"method\": \"getLatestBlockhash\",\n \"params\": [\n {\n \"commitment\": \"processed\",\n \"minContextSlot\": 1000\n }\n ]\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://mainnet.helius-rpc.com/?api-key=")
.header("Content-Type", "application/json")
.body("{\n \"jsonrpc\": \"2.0\",\n \"id\": \"1\",\n \"method\": \"getLatestBlockhash\",\n \"params\": [\n {\n \"commitment\": \"processed\",\n \"minContextSlot\": 1000\n }\n ]\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://mainnet.helius-rpc.com/?api-key=")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n \"jsonrpc\": \"2.0\",\n \"id\": \"1\",\n \"method\": \"getLatestBlockhash\",\n \"params\": [\n {\n \"commitment\": \"processed\",\n \"minContextSlot\": 1000\n }\n ]\n}"
response = http.request(request)
puts response.read_body{
"jsonrpc": "2.0",
"id": "1",
"result": {
"context": {
"slot": 2792
},
"value": {
"blockhash": "EkSnNWid2cvwEVnVx9aBqawnmiCNiDgp3gUdkDPTKN1N",
"lastValidBlockHeight": 3090
}
}
}{
"jsonrpc": "2.0",
"error": {
"code": -32602,
"message": "Invalid params"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32001,
"message": "Unauthorized"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32005,
"message": "Too many requests"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32603,
"message": "Internal error"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32002,
"message": "Service unavailable"
},
"id": "1"
}{
"jsonrpc": "2.0",
"error": {
"code": -32003,
"message": "Gateway timeout"
},
"id": "1"
}