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API · /beaconchain-api

Ethereum Beacon Chain Consensus API

healthy 3,843 Subscribers

The live consensus state of Ethereum's Beacon Chain — the proof-of-stake layer that secures Ethereum — read keyless straight from a public consensus-layer node. The single thing that matters for the health of proof-of-stake Ethereum is whether it is finalizing: every epoch (about every six and a half minutes) the validators are supposed to justify and then finalize the chain, and on the rare occasions that finality stalls — as it briefly did in 2023 — staking services, exchanges and bridges need to know immediately. The status endpoint returns the current head slot and epoch, how far through the current epoch the chain is and how long until the next one, the finalized and justified epochs, the finality lag (how many epochs behind finality the head is — a lag of two is healthy, a growing lag is trouble) and whether the node is fully synced and finalizing. The finality endpoint returns the finalized, current-justified and previous-justified checkpoints in detail, with how far behind the head each is in epochs and minutes. The genesis endpoint returns the chain's genesis time, how long Ethereum proof-of-stake has been running and the slot/epoch timing constants (a slot every 12 seconds, 32 slots per epoch). This is the Ethereum consensus / finality cut — distinct from the execution-layer feeds (gas, blocks, transactions), the staking-token and restaking feeds and the price feeds: it is the beacon chain's own heartbeat. Note it reports consensus state (slots, epochs, finality), not per-validator economics, which a public consensus node does not serve in one call. Times are UTC; epochs and slots are integers. No key, nothing stored beyond a short cache.

#ethereum #beacon-chain #consensus #finality #proof-of-stake #staking #crypto
api.oanor.com/beaconchain-api
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Machine-readable spec so AI agents can integrate this API.

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

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

Ethereum Beacon Chain Consensus API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
103 ms
Server probes · 24h
Subscribers
3,843
active
Total calls
40
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,150 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,150 calls/month
  • 2 req/sec
  • All endpoints
  • No credit card
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Starter

€18.50 /month

  • 25,500 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 25.5k calls/month
  • 6 req/sec
  • Status + finality
  • Email support
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Pro

€61.00 /month

  • 150,000 calls / month
  • 16 requests / second
  • Hard cap (429 above quota, no overage)
  • 150k calls/month
  • 16 req/sec
  • Finality-health monitoring
  • Priority support
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Scale

€179.00 /month

  • 505,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 505k calls/month
  • 40 req/sec
  • Full consensus feed
  • Dedicated SLA
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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Ethereum Beacon Chain Consensus API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Ethereum Beacon Chain Consensus API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Ethereum Beacon Chain Consensus 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 Ethereum Beacon Chain Consensus API cost?
Ethereum Beacon Chain Consensus API has a free tier with 100 calls / month. Paid plans start at €18.50 / 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 Ethereum Beacon Chain Consensus API GDPR-compliant?
All requests to Ethereum Beacon Chain Consensus 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/beaconchain-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/beaconchain-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/beaconchain-api/SOME_PATH");
curl_setopt($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/beaconchain-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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