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API · /blobspace-api

Ethereum Blob Space (EIP-4844) API

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The Ethereum blob data-availability fee market that every layer-2 rollup lives and dies by, live from the public Blobscan dataset, no key. Since the Dencun upgrade (EIP-4844, proto-danksharding) rollups no longer post their compressed transaction data as expensive calldata — they post it as blobs, large temporary data packets priced in their own independent fee market (the blob-gas market, with its own base fee that rises when blocks are full of blobs and falls when they are not). Blob space is now the single biggest cost line for almost every rollup, so the blob base fee and how much blob space each rollup consumes is the core economics of the entire layer-2 ecosystem — when blob demand spikes, every rollup's costs (and ultimately its user fees) rise together. The network endpoint returns the live state of the blob fee market: the current blob base fee, the average over recent blocks, the average blobs per block against the protocol target and maximum, the resulting utilisation, the excess blob gas that drives the fee, and the data-availability fee burned per block. The rollups endpoint is the key view — it ranks the layer-2 rollups by how much blob space they are consuming right now (Base, Arbitrum, Optimism, World, Taiko and the rest), each with its blob count, blob gas used, share of all blob space and the data-availability fee it is paying in ETH. The blocks endpoint lists the most recent blocks with their blob count, blob base fee and DA fee. This is the blob / data-availability fee-market cut — distinct from the multi-chain execution-gas oracle (the EIP-1559 execution-gas market, not the separate blob-gas market), the ETH supply/burn feed (which reports a single blob-base-fee number but not blob-space utilisation or which rollups consume it), and the on-chain and TVL feeds. Fees are in gwei and ETH; figures are live, per block.

#ethereum #blob #eip-4844 #rollup #layer-2 #data-availability #gas #crypto
api.oanor.com/blobspace-api
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Machine-readable spec so AI agents can integrate this API.

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

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Ethereum Blob Space (EIP-4844) API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
857 ms
Server probes · 24h
Subscribers
3,168
active
Total calls
68
last 7 days
status Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

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

€13.20 /month

  • 18,500 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 18.5k calls/month
  • 6 req/sec
  • Network + rollups + blocks
  • Email support
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Pro

€39.20 /month

  • 88,000 calls / month
  • 16 requests / second
  • Hard cap (429 above quota, no overage)
  • 88k calls/month
  • 16 req/sec
  • Live rollup DA tracking
  • Priority support
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Mega

€87.80 /month

  • 520,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 520k calls/month
  • 40 req/sec
  • 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 Blob Space (EIP-4844) API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Ethereum Blob Space (EIP-4844) API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Ethereum Blob Space (EIP-4844) 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 Blob Space (EIP-4844) API cost?
Ethereum Blob Space (EIP-4844) API has a free tier with 100 calls / month. Paid plans start at €13.20 / 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 Blob Space (EIP-4844) API GDPR-compliant?
All requests to Ethereum Blob Space (EIP-4844) 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.

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Code snippets

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curl https://api.oanor.com/blobspace-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/blobspace-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/blobspace-api/SOME_PATH");
curl_setopt($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/blobspace-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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