getTokenDecimals

Queries a SPL Token's mint address to get its number of decimal places (decimals). SPL Token balances are stored as integers on-chain, and the decimals value is needed to convert the raw balance into a user-friendly, readable format. For example, a token with 6 decimals represents 1 token as the integer 1,000,000.

Parameters

Parameter	Type	Description
mintPubkeyBase58	const String&	The Base58 address of the SPL Token mint.
outDecimals	uint8_t&	An output parameter that will be populated with the number of decimals.

Return Value

• bool: Returns true if the decimal information was fetched successfully, false otherwise.

Example Code (main.cpp)

#include <Arduino.h>
#include <WiFi.h>
#include "Infratic-lib.h"

// --- WiFi Settings ---
const char* WIFI_SSID = "YOUR_WIFI_SSID";
const char* WIFI_PASSWORD = "YOUR_WIFI_PASSWORD";

// --- Solana Settings ---
const String SOLANA_RPC_URL = "[https://api.devnet.solana.com](https://api.devnet.solana.com)";
// Example: Devnet USDC mint address (has 6 decimals)
const String TOKEN_MINT_BASE58 = "Gh9ZwEmdLJ8DscKNTkTqPbNwLNNBjuSzaG9Vp2KGtKJr";
Infratic solana(SOLANA_RPC_URL);

void setup() {
    Serial.begin(115200);
    delay(1000);

    // Connect to WiFi
    Serial.print("Connecting to WiFi...");
    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("\n✅ WiFi connected!");

    Serial.println("\n=== Get Token Decimals Example ===");

    uint8_t decimals = 0;
    if (solana.getTokenDecimals(TOKEN_MINT_BASE58, decimals)) {
        Serial.print("✅ The token with mint '");
        Serial.print(TOKEN_MINT_BASE58);
        Serial.print("' has ");
        Serial.print(decimals);
        Serial.println(" decimals.");
    } else {
        Serial.println("❌ Failed to get token decimals.");
    }
}

void loop() {
    // Can be left empty
}