TONSCAN wallet balance

Look up TON blockchain wallet balances, address information, and token holdings using the free TonScan API — no API key required. Use this skill whenever the user wants to check a TON wallet address balance, look up on-chain data for a TON address, convert nanoton values, or fetch TON account details. Trigger even for casual requests like "how much TON is in this wallet?" or "check this address for me".

TonScan Wallet Balance Skill

Query real-time TON blockchain data using TonScan's free public API. No authentication needed.

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Core Concepts

Units: Nanotons vs TON

The TON blockchain stores all balances in nanotons (the smallest indivisible unit).

Unit	Value
1 TON	1,000,000,000 nanotons
1 nanoton	0.000000001 TON

Always divide raw API values by 1_000_000_000 (1e9) before displaying to users.

Example:

Raw API value:  1296986856910034000
Divide by 1e9:  1296986856.910034 TON

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Primary Endpoint: Address Information

GET https://api.tonscan.com/api/bt/getAddressInformation?address={ADDRESS}

Quick Balance Lookup (one-liner)

curl -s "https://api.tonscan.com/api/bt/getAddressInformation?address=EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2" \
  | jq '.json.data.detail.balance'

Full Response with Human-Readable Balance

ADDRESS="EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2"
curl -s "https://api.tonscan.com/api/bt/getAddressInformation?address=${ADDRESS}" \
  | jq '{
      address: .json.data.detail.address,
      balance_nanoton: .json.data.detail.balance,
      balance_TON: (.json.data.detail.balance | tonumber / 1000000000),
      status: .json.data.detail.status
    }'

Sample output:

{
  "address": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
  "balance_nanoton": 1296986856910034000,
  "balance_TON": 1296986856.910034,
  "status": "active"
}

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Response Structure

The full response nests data under .json.data.detail. Key fields:

Field	Path	Description
Balance (raw)	.json.data.detail.balance	Balance in nanotons (integer string)
Address	.json.data.detail.address	Canonical address string
Status	.json.data.detail.status	active, uninitialized, or frozen
Last activity	.json.data.detail.last_activity	Unix timestamp of last transaction

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Address Format Notes

TON addresses come in two formats — both refer to the same wallet:

• User-friendly (EQ...): EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2
• Raw (0:...): 0:ED169130705004711...

The TonScan API accepts both formats. Always use the user-friendly EQ... or UQ... format when displaying addresses back to users.

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Python Example

import requests

def get_ton_balance(address: str) -> dict:
    url = "https://api.tonscan.com/api/bt/getAddressInformation"
    resp = requests.get(url, params={"address": address})
    resp.raise_for_status()

    detail = resp.json()["json"]["data"]["detail"]
    nanotons = int(detail["balance"])

    return {
        "address": detail["address"],
        "balance_ton": nanotons / 1_000_000_000,
        "balance_nanoton": nanotons,
        "status": detail.get("status", "unknown"),
    }

# Example
info = get_ton_balance("EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2")
print(f"Balance: {info['balance_ton']:,.9f} TON")
# → Balance: 1,296,986,856.910034000 TON

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JavaScript / Node.js Example

async function getTonBalance(address) {
  const url = new URL("https://api.tonscan.com/api/bt/getAddressInformation");
  url.searchParams.set("address", address);

  const res = await fetch(url);
  const data = await res.json();
  const detail = data.json.data.detail;

  const nanotons = BigInt(detail.balance);
  const ton = Number(nanotons) / 1e9;

  return {
    address: detail.address,
    balanceTon: ton,
    balanceNanoton: nanotons.toString(),
    status: detail.status,
  };
}

// Usage
const info = await getTonBalance("EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2");
console.log(`Balance: ${info.balanceTon.toLocaleString()} TON`);

⚠️ JavaScript precision note: TON balances can exceed Number.MAX_SAFE_INTEGER. Use BigInt for the raw nanoton value and only convert to Number for display purposes.

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Error Handling

HTTP Status	Meaning	Action
200	Success	Parse .json.data.detail
400	Invalid address format	Validate address starts with EQ, UQ, or 0:
404	Address not found	Address may be valid but never received TON (balance = 0)
429	Rate limited	Add exponential backoff; this is a free tier API
5xx	Server error	Retry after a short delay

Checking for empty/uninitialized accounts:

curl -s "https://api.tonscan.com/api/bt/getAddressInformation?address=..." \
  | jq 'if .json.data.detail.balance == "0" then "Empty wallet" else "Has funds" end'

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Rate Limits & Usage

• Free tier, no API key required
• No official rate limit is published; treat as a shared public resource
• For production use or high-volume lookups, add 429 retry logic with exponential backoff
• For exploratory/one-off queries, no special handling needed

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Displaying Results to Users

Always format balances with full precision and comma separators:

✅  1,296,986,856.910034 TON
❌  1296986856.910034
❌  1296986857 TON  (rounded — loses nanoton precision)

When showing to non-technical users, rounding to 2–4 decimal places is fine for readability, but note that full precision is available.