Native balance + nonce + is-contract on one chain
API · /walletbalance-api
EVM Wallet Balance API
healthy
3,131 Subscribers
Live native-coin balance for any EVM wallet address across the major chains as an API, read straight from each network's public JSON-RPC node. For any 0x address it returns the native balance (in coin units and in wei), the transaction count (nonce), and whether the address is a smart contract. Check one chain, or fan out across every supported chain at once to see where a wallet holds funds — Ethereum, Polygon, BNB Smart Chain, Arbitrum, Optimism, Base and Avalanche. The wallet-balance and address-lookup layer every wallet app, portfolio tracker and dashboard needs. Live, no key, no cache. Distinct from gas-fee and price APIs — this is on-chain address balances.
api.oanor.com/walletbalance-api
API health
healthy- Uptime
- 100.00%
- Server probes · 24h
- Avg latency
- 121 ms
- Server probes · 24h
- Subscribers
- 3,131
- active
- Total calls
- 80
- last 7 days
Pricing
Pick a tier — billed monthly, cancel anytime.
Free
Free
- 6,000 calls / month
- 5 requests / second
- Hard cap (429 above quota, no overage)
- 6k calls/month
- 5 req/sec
- All endpoints
- No credit card
Starter
€12.00 /month
- 80,000 calls / month
- 15 requests / second
- Hard cap (429 above quota, no overage)
- 80k calls/month
- 15 req/sec
- Email support
Pro
€29.00 /month
- 420,000 calls / month
- 40 requests / second
- Hard cap (429 above quota, no overage)
- 420k calls/month
- 40 req/sec
- Priority support
Desk
€68.00 /month
- 2,200,000 calls / month
- 100 requests / second
- Hard cap (429 above quota, no overage)
- 2.2M calls/month
- 100 req/sec
- Dedicated SLA
Built by
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Tell whether a domain is a known crypto phishing or scam site before a wallet or user connects to it — using MetaMask's canonical eth-phishing-detect blocklist, the same list that protects millions of MetaMask users, read keyless and live. It runs the real detection logic: an exact and subdomain match against the blocklist and allowlist, plus a Levenshtein fuzzy match against high-value lookalike targets to catch typosquats like "myetherwaliet.com" or "app-wallet-uniswap.org". Check a domain or URL for a verdict (blocked, allowed, fuzzy or unknown) with the reason, search the 190,000-entry blocklist, or read its stats. The dApp-connection safety layer every wallet, browser extension, Telegram bot and security tool needs to warn users before they sign. Live, lightly cached.
api.oanor.com/phishingcheck-api
Token List API
A live ERC-20 token metadata directory aggregated from the curated, on-chain token lists that wallets and dApps actually trust — Uniswap Labs Default, CoinGecko, 1inch, Aave and the Optimism Superchain list — read keyless from their public endpoints. Resolve any token contract address on any chain to its canonical name, symbol, decimals and logo; list a curated set in full (paged, filterable by chain); search across every list by symbol or name; and discover a token's bridged addresses on other chains. The metadata layer every wallet, swap UI and portfolio tracker needs before it can safely display or transact a token. Live, short cache only — nothing stored.
api.oanor.com/tokenlist-api
Safe Multisig API
Inspect any Safe (formerly Gnosis Safe) multisig smart wallet, keyless. For any Safe address on any supported chain it returns the multisig configuration — the owner signers, the signature threshold (the M-of-N), the current nonce, the enabled modules, guard and contract version — and the Safe token balances (native + ERC-20, with symbols and amounts). The multisig-inspection layer for DAO treasuries, security, due-diligence, wallet and dashboard tooling. Live, nothing stored. Backed by the open Safe Transaction Service.
api.oanor.com/safe-api
Token Approval Security API
Live audit of the token approvals (allowances) a crypto wallet has granted, and the risk of the contracts it has approved to spend its tokens — powered by the public GoPlus Security data, no key, nothing stored. Token approvals are the single most common way wallets get drained: once you approve a contract to move a token, a malicious or compromised spender can take it whenever it likes. This is the allowance-hygiene layer — the data behind tools like revoke.cash. The approvals endpoint lists every token a wallet has approved, who it approved (the spender contract), how much was approved and when, and whether that spender is flagged as malicious, trusted or unverified, together with a risk summary counting the dangerous approvals to revoke. The contract endpoint profiles a single spender contract before you approve it — its name, whether it is open-source, its creator, deploy time and risk tags. The chains endpoint lists the 40-plus supported blockchains. Catch wallet-draining allowances before they cost a user everything. This is the approval / allowance-risk cut — distinct from the token-contract-security, scam-detection and on-chain APIs in the catalogue.
api.oanor.com/approvalsecurity-api
Frequently asked questions
Quick answers about pricing, quotas, and integration.
How do I get an API key for EVM Wallet Balance API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call EVM Wallet Balance API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for EVM Wallet Balance API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does EVM Wallet Balance API cost?
EVM Wallet Balance API has a free tier with 100 calls / month. Paid plans start at €12.00 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is EVM Wallet Balance API GDPR-compliant?
All requests to EVM Wallet Balance API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.
Pick an endpoint from the list on the left to see its details and try it.
Code snippets
Sign up to get an API key, then call any path under your slug.
curl https://api.oanor.com/walletbalance-api/SOME_PATH \
-H "x-oanor-key: oanor_test_..."const res = await fetch("https://api.oanor.com/walletbalance-api/SOME_PATH", {
headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();$ch = curl_init("https://api.oanor.com/walletbalance-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);import requests
r = requests.get(
"https://api.oanor.com/walletbalance-api/SOME_PATH",
headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())Ratings
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