API · /blockchair-api

Blockchair Multi-Chain Stats API

healthy 3,301 Subscribers

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.

#blockchair #crypto #on-chain #mempool #blockchain-stats #bitcoin #ethereum #fees

api.oanor.com/blockchair-api

Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/blockchair-api/openapi.json

/api/blockchair-api/llms.txt

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

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 129 ms; Server probes · 24h
Subscribers: 3,301; active
Total calls: 10; last 7 days

Full status page → · 15 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

1,880 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
1,880 calls/month
2 req/sec
All endpoints
No credit card

Basic

€10.40 /month

47,200 calls / month
6 requests / second
Hard cap (429 above quota, no overage)
47,200 calls/month
6 req/sec
All chains
Email support

Pro

€31.60 /month

198,000 calls / month
18 requests / second
Hard cap (429 above quota, no overage)
198,000 calls/month
18 req/sec
Priority support

Scale

€72.80 /month

845,000 calls / month
45 requests / second
Hard cap (429 above quota, no overage)
845,000 calls/month
45 req/sec
Dedicated SLA

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

Chain Stats API

Live blockchain network statistics across 18 chains, from the public Blockchair feed. Get one network's full stats — price, market cap and dominance, block height, 24h transactions, circulating supply, difficulty, hashrate, mempool size and average fee; compare the major chains side by side, ranked by market cap; and read a chain's mempool congestion (pending transactions, size and fees). A multi-chain network-stats layer — distinct from single-coin price feeds and Bitcoin-only on-chain APIs: it answers how each blockchain is performing right now and how they compare. Live, with a 10-minute upstream cache.

api.oanor.com/chainstats-api

WEMIX API

Live EVM on-chain data for WEMIX (chain id 1111) — the gaming-focused public Layer-1 built by Wemade, whose native token is WEMIX — served directly from public EVM JSON-RPC nodes with multi-node failover. The status endpoint returns the chain and network id, the latest block height and the node client version. The block endpoint returns a block by number (or the latest) with its hash, parent hash, timestamp, transaction count, gas used and gas limit, miner and size. The gas endpoint returns the current gas price in both wei and gwei. The balance endpoint returns the WEMIX balance and outgoing transaction count for any address, converted from base wei (18 decimals) into whole WEMIX with exact big-integer scaling. Every figure is read live from the chain over JSON-RPC — nothing bundled or modelled — behind a short server-side cache with keep-warm so the feed stays fast and fresh. Ideal for explorers, wallet and dashboard tooling, gas trackers, address monitors and game-economy analytics across the WEMIX ecosystem. Live keyless upstream. 5 endpoints.

api.oanor.com/wemix-api

Monad API

Live EVM on-chain data for Monad (chain id 143) — the high-performance, parallel-execution Layer-1 designed for thousands of transactions per second, whose native token is MON — served directly from public EVM JSON-RPC nodes with multi-node failover. The status endpoint returns the chain and network id, the latest block height and the node client version. The block endpoint returns a block by number (or the latest) with its hash, parent hash, timestamp, transaction count, gas used and gas limit, miner and size. The gas endpoint returns the current gas price in both wei and gwei. The balance endpoint returns the MON balance and outgoing transaction count for any address, converted from base wei (18 decimals) into whole MON with exact big-integer scaling. Every figure is read live from the chain over JSON-RPC — nothing bundled or modelled — behind a short server-side cache with keep-warm so the feed stays fast and fresh. Ideal for explorers, wallet and dashboard tooling, gas trackers, address monitors and analytics apps across the Monad ecosystem. Live keyless upstream. 5 endpoints.

api.oanor.com/monad-api

Superposition API

Live EVM on-chain data for Superposition (chain id 55244) — an Arbitrum-Orbit DeFi Layer-3 with ETH gas and on-chain yield-bearing Super Assets — served directly from the public Superposition JSON-RPC with server-side resilience. The status endpoint returns the chain and network id, the latest block height and the node client version. The block endpoint returns a block by number (or the latest) with its hash, parent hash, timestamp, transaction count, gas used and gas limit, miner and size. The gas endpoint returns the current gas price in both wei and gwei. The balance endpoint returns the ETH balance and outgoing transaction count for any address, converted from base wei (18 decimals) into whole ETH with exact big-integer scaling. Every figure is read live from the chain over JSON-RPC — nothing bundled or modelled — behind a short server-side cache with keep-warm so the feed stays fast and fresh. Ideal for explorers, wallet and dashboard tooling, gas trackers, address monitors and DeFi analytics across the Superposition and Arbitrum-Orbit ecosystem. Live keyless upstream. 5 endpoints.

api.oanor.com/superposition-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Blockchair Multi-Chain Stats API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Blockchair Multi-Chain Stats API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Blockchair Multi-Chain Stats 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 Blockchair Multi-Chain Stats API cost?

Blockchair Multi-Chain Stats API has a free tier with 100 calls / month. Paid plans start at €10.40 / 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 Blockchair Multi-Chain Stats API GDPR-compliant?

All requests to Blockchair Multi-Chain Stats 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.

Reference 1

Stats 1

Mempool 1

Market 1

Meta 1

Pick an endpoint from the list on the left to see its details and try it.

GET /v1/chains

List supported chains

Playground

Custom headers

Language: Client:

GET /v1/stats

Network stats for a chain

Playground

Parameters

Custom headers

Language: Client:

GET /v1/mempool

Mempool and fee conditions for a chain

Playground

Parameters

Custom headers

Language: Client:

GET /v1/market

Market price, cap and dominance for a chain

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Service metadata

Playground

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/blockchair-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/blockchair-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/blockchair-api/SOME_PATH");
curl_setopt($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/blockchair-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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Blockchair Multi-Chain Stats API

API health

Pricing

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Related APIs

Chain Stats API

WEMIX API

Monad API

Superposition API

Frequently asked questions

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