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API · /gasfees-api

Multi-Chain Gas Fees API

healthy 4,116 Subscribers

Live multi-chain EVM gas-fee oracle — the gas estimate every wallet, bridge and dApp needs — computed straight from each network's public JSON-RPC node. Using EIP-1559 fee history it derives the next block's base fee and slow, standard and fast priority-fee tiers from the recent reward percentiles, and returns per tier the priority fee, the suggested max fee and the resulting total gas price, all in gwei. It also estimates the cost of a transaction — a plain transfer or any gas limit you pass — in the chain's native coin. Supports Ethereum, Polygon, BSC, Arbitrum, Optimism, Base and Avalanche. Live, no key, no cache. Distinct from price, market-cap and on-chain TVL APIs — this is the real-time gas-price layer.

#gas-fees #crypto #ethereum #evm #eip-1559 #gwei #web3 #on-chain
api.oanor.com/gasfees-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
132 ms
Server probes · 24h
Subscribers
4,116
active
Total calls
20
last 7 days
status Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 15,000 calls / month
  • 5 requests / second
  • Hard cap (429 above quota, no overage)
  • 15k calls/month
  • 5 req/sec
  • All endpoints
  • No credit card
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Starter

€10.00 /month

  • 200,000 calls / month
  • 15 requests / second
  • Hard cap (429 above quota, no overage)
  • 200k calls/month
  • 15 req/sec
  • Email support
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Pro

€29.00 /month

  • 1,000,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 1M calls/month
  • 40 req/sec
  • Priority support
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Scale

€69.00 /month

  • 5,000,000 calls / month
  • 120 requests / second
  • Hard cap (429 above quota, no overage)
  • 5M calls/month
  • 120 req/sec
  • Dedicated SLA
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api.oanor.com/cryptohistory-api

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Crypto Exchanges API

Live rankings and comparison of crypto exchanges, served from the public CoinPaprika feed — no key, nothing cached. Rank every crypto exchange by adjusted 24h volume with its 7d/30d volume, number of markets and currencies and confidence score; pull one exchange's full profile (volumes, market count, website and social links, status); list an exchange's trading pairs with price and 24h volume; and search exchanges by name. A cross-exchange comparison layer, distinct from single-exchange ticker feeds and whole-market price feeds — it answers which venues are biggest and what they trade. Volumes in USD; adjusted = wash-trade-filtered.

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Multi-Chain Gas Fees API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Multi-Chain Gas Fees API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Multi-Chain Gas Fees 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 Multi-Chain Gas Fees API cost?
Multi-Chain Gas Fees API has a free tier with 100 calls / month. Paid plans start at €10.00 / 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 Multi-Chain Gas Fees API GDPR-compliant?
All requests to Multi-Chain Gas Fees 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/gasfees-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/gasfees-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/gasfees-api/SOME_PATH");
curl_setopt($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/gasfees-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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