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API · /ercdetector-api

ERC Detector API

healthy 4,627 Subscribers

Tell what kind of contract an address actually is — live, by asking the chain itself. It probes the contract over the public JSON-RPC (eth_call, no key): an ERC-165 interface sweep (ERC-721, ERC-1155 and their metadata/enumerable/royalty extensions) plus an ERC-20 function probe (name, symbol, decimals, totalSupply), and classifies the address as an ERC-20 token, an NFT (ERC-721), a multi-token (ERC-1155), a plain contract or an externally-owned account. A dedicated endpoint returns a token's live on-chain ERC-20 metadata — working for ANY token, including brand-new ones no token list has yet indexed. The "what is this address" primitive every wallet, explorer, scanner and security tool needs, across Ethereum, Base, Arbitrum, Optimism, BNB, Polygon and more. Reads straight from the chain; live, short cache only.

#erc #erc20 #erc721 #nft #erc165 #detect #crypto
api.oanor.com/ercdetector-api
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Machine-readable spec so AI agents can integrate this API.

/api/ercdetector-api/openapi.json
/api/ercdetector-api/llms.txt

Discovery: GET /api/index.json lists every API.

ERC Detector API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
119 ms
Server probes · 24h
Subscribers
4,627
active
Total calls
28
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 5,800 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 5,800 calls/month
  • 3 req/sec
  • Type detection + ERC-20 read
  • No credit card
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Starter

€9.90 /month

  • 125,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 125k calls/month
  • 8 req/sec
  • ERC-165 interface sweep
  • Email support
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Pro

€36.50 /month

  • 760,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 760k calls/month
  • 20 req/sec
  • Multi-chain (8+ chains)
  • Priority support
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Business

€108.00 /month

  • 4,900,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 4.9M calls/month
  • 50 req/sec
  • Commercial use
  • Dedicated SLA
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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.

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ERC-20 Token Info API

Live ERC-20 token metadata, read straight off the blockchain. Give it any token contract address and it returns the token's name, symbol, decimals and total supply — both as the raw on-chain integer and as a human-formatted number — by calling the ERC-20 contract directly via the chain's public JSON-RPC node (eth_call), confirming first that the address is really a contract. The USD Coin contract resolves to "USD Coin", symbol USDC, 6 decimals; Wrapped BTC on Polygon to "(PoS) Wrapped BTC", symbol WBTC, 8 decimals. The balance endpoint reads any wallet's holding of any token — pass the token contract and an owner address and it returns the balance raw and formatted with the token's own decimals and symbol. It works across seven EVM chains — Ethereum, Polygon, BNB Smart Chain, Arbitrum, Optimism, Base and Avalanche — with friendly aliases (eth, matic, bnb, arb, op, avax). This is the token-metadata and token-balance layer every wallet, DEX, portfolio tracker, block explorer and DeFi dashboard needs: turn a bare 0x… contract into a named, decimalled token, and resolve any holder's balance, in one call. Read live from the chain, no key on the data source, nothing cached. Distinct from native-coin balance and market-price APIs — this is on-chain ERC-20 contract data read directly from the blockchain. 4 endpoints across 7 chains.

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Live zkSync Era on-chain data as an API, built on the open Blockscout explorer. zkSync Era (chain id 324) is a leading Ethereum zk-rollup Layer-2 by Matter Labs; its native currency is ETH and fees are a fraction of mainnet. Pull network stats (total blocks and transactions, ETH price, live gas), a gas oracle with slow, average and fast prices in gwei, the most recent blocks and full block detail by height or hash. Look up any address for its balance and contract status, any transaction by hash for its value, fee, status, sender and receiver, and any ERC-20 token by contract for its name, symbol, decimals, holders and USD rate. A universal search resolves addresses, tokens, blocks and transactions in one call. Real on-chain data, no key needed upstream. Ideal for zkSync wallets, block explorers, gas trackers, DeFi dashboards and on-chain analytics.

api.oanor.com/zksync-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for ERC Detector API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call ERC Detector API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for ERC Detector 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 ERC Detector API cost?
ERC Detector API has a free tier with 100 calls / month. Paid plans start at €9.90 / 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 ERC Detector API GDPR-compliant?
All requests to ERC Detector 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/ercdetector-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/ercdetector-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/ercdetector-api/SOME_PATH");
curl_setopt($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/ercdetector-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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