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API · /eipregistry-api

EIP Registry API

healthy 3,261 Subscribers

A live, queryable index of every Ethereum Improvement Proposal (EIP) and ERC token standard, read keyless straight from the canonical ethereum/EIPs and ethereum/ERCs repositories. Look up any proposal by number for its title, status (Draft, Review, Last Call, Final, Living, Stagnant or Withdrawn), type and category, authors, creation date, what it requires and its abstract; pull several proposals at once; or list the whole catalog of 1,500+ EIPs and ERCs. The reference layer for wallets, block explorers, documentation sites and developer tooling that need to resolve "what is EIP-1559" or "is ERC-4626 final yet" programmatically instead of scraping a website. Always current — read live from the source repos, lightly cached.

#eip #erc #ethereum #standards #reference #governance #crypto
api.oanor.com/eipregistry-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
297 ms
Server probes · 24h
Subscribers
3,261
active
Total calls
20
last 7 days
status Full status page → · 12 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 7,000 calls / month
  • 3 requests / second
  • Hard cap (429 above quota, no overage)
  • 7,000 calls/month
  • 3 req/sec
  • Lookup + catalog
  • No credit card
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Starter

€8.40 /month

  • 135,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 135k calls/month
  • 8 req/sec
  • Batch lookup
  • Email support
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Pro

€29.50 /month

  • 820,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 820k calls/month
  • 20 req/sec
  • EIPs + ERCs
  • Priority support
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Business

€88.00 /month

  • 5,100,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 5.1M calls/month
  • 50 req/sec
  • Commercial use
  • Dedicated SLA
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Live on-chain network statistics, mempool conditions and market data across the major UTXO blockchains and Ethereum, sourced from Blockchair. For any supported chain read the full network state — best block height, total and 24-hour block and transaction counts, mining difficulty, hashrate, coin circulation, on-chain transfer volume and chain size — or zoom into the mempool to see pending transactions, mempool size, transactions-per-second, the suggested fee per byte (or median gas price on Ethereum) and average and median transaction fees in native units and USD, or pull market data with the coin price in USD and BTC, 24-hour change, market capitalisation and dominance. Ten chains are covered: Bitcoin, Bitcoin Cash, Litecoin, Dogecoin, Dash, Zcash, Bitcoin SV, eCash, Groestlcoin and Ethereum. Distinct from single-chain mempool and gas feeds: this is one consistent multi-chain stats surface.

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Decode Ethereum smart-contract function and event signatures, keyless. Turn a 4-byte function selector (the first 4 bytes of any transaction calldata, e.g. 0xa9059cbb) into its human-readable function signature (transfer(address,uint256)), decode a 32-byte event topic from a log into its event signature, or search the database by name to find a selector. Many selectors have hash collisions — the API flags the original / canonical signature. Backed by the open 4byte.directory database, live. Essential for transaction decoders, block explorers, wallets, security tools and on-chain analytics — the signature-decoding layer for any EVM tooling.

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for EIP Registry API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call EIP Registry API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for EIP Registry 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 EIP Registry API cost?
EIP Registry API has a free tier with 100 calls / month. Paid plans start at €8.40 / 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 EIP Registry API GDPR-compliant?
All requests to EIP Registry 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/eipregistry-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/eipregistry-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/eipregistry-api/SOME_PATH");
curl_setopt($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/eipregistry-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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