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API · /mevboost-api

Ethereum MEV-Boost API

healthy 4,710 Subscribers

Who actually builds Ethereum's blocks and which relays deliver them — live from the public MEV-Boost relay APIs, no key. Since the Merge most Ethereum validators outsource block construction through MEV-Boost: specialised block builders compete to assemble the most valuable block (capturing MEV — arbitrage, liquidations, sandwiches — plus priority fees), relays act as trusted middlemen between builders and validators, and the validator simply signs the highest-paying block. This builder-and-relay market is one of the most important and most centralised pieces of Ethereum's infrastructure — a handful of builders win the large majority of blocks — so tracking who is winning and how much they pay is core to Ethereum decentralisation and MEV analytics. The builders endpoint ranks block builders by how many of the recent blocks they won, with each builder's block share, the total and average value (in ETH) they paid validators, and a name where the builder's public key is known. The relays endpoint shows each MEV-Boost relay's reach across the major relays (Flashbots, Ultrasound, bloXroute, Agnostic, Aestus, Titan). The blocks endpoint lists the most recent blocks delivered through MEV-Boost, each with its builder, the value paid to the proposer, gas used, transaction count and which relays delivered it. This is the block-building / MEV-Boost cut, the supply side of Ethereum block production — distinct from the blob-space fee market, the execution-gas oracle, the ETH supply/burn feed and the on-chain and DeFi feeds. Values are in ETH; everything is live. Built for Ethereum infrastructure, MEV research, staking and analytics tools.

#ethereum #mev #mev-boost #block-builders #relays #staking #crypto
api.oanor.com/mevboost-api
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Machine-readable spec so AI agents can integrate this API.

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

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

Ethereum MEV-Boost API — live data on the oanor API marketplace

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
190 ms
Server probes · 24h
Subscribers
4,710
active
Total calls
84
last 7 days
status Full status page → · 16 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 1,020 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 1,020 calls/month
  • 2 req/sec
  • All endpoints
  • No credit card
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Starter

€12.30 /month

  • 21,800 calls / month
  • 6 requests / second
  • Hard cap (429 above quota, no overage)
  • 21.8k calls/month
  • 6 req/sec
  • Builders + relays + blocks
  • Email support
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Pro

€35.60 /month

  • 116,000 calls / month
  • 16 requests / second
  • Hard cap (429 above quota, no overage)
  • 116k calls/month
  • 16 req/sec
  • Full block stream
  • Priority support
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Mega

€79.20 /month

  • 642,000 calls / month
  • 40 requests / second
  • Hard cap (429 above quota, no overage)
  • 642k 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 MEV-Boost API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Ethereum MEV-Boost API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Ethereum MEV-Boost 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 MEV-Boost API cost?
Ethereum MEV-Boost API has a free tier with 100 calls / month. Paid plans start at €12.30 / 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 MEV-Boost API GDPR-compliant?
All requests to Ethereum MEV-Boost 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/mevboost-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/mevboost-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/mevboost-api/SOME_PATH");
curl_setopt($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/mevboost-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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