API · /cardano-api

Cardano API

healthy 4,494 Subscribers

Live on-chain data from the Cardano blockchain (ADA) via the public Koios indexer. Resolve a stake account's whole state — total ADA controlled, UTxO balance, the stake pool it delegates to, its DRep governance vote, lifetime and withdrawable staking rewards, and registration status. Fetch the native tokens and NFTs a stake account holds, with policy id, decoded asset name, fingerprint and decimal-adjusted quantity. Read a stake pool's live economics — ticker, active and live stake, live saturation, margin, fixed cost, pledge, blocks minted and delegator count. Get the live chain tip and current-epoch active stake, transaction count and fees. Live, no key, nothing stored. Distinct from the XRP Ledger, Stellar, TRON, Aptos, Algorand, Tezos, EVM and Solana on-chain APIs and from price feeds — this is Cardano stake-account state, delegation, native-asset holdings, stake-pool economics and epoch health. Perfect for wallets, explorers, staking dashboards, delegation tools, NFT and analytics apps.

#cardano #ada #blockchain #crypto #staking #on-chain #koios #web3

api.oanor.com/cardano-api

Get an API key Try in playground → Contact provider

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

/api/cardano-api/openapi.json

/api/cardano-api/llms.txt

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

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 741 ms; Server probes · 24h
Subscribers: 4,494; active
Total calls: 12; last 7 days

Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

6,000 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
6k calls/month
2 req/sec
Account + assets + pool + network
No credit card

Starter

€12.00 /month

140,000 calls / month
5 requests / second
Hard cap (429 above quota, no overage)
140k calls/month
5 req/sec
Email support

Pro

€36.00 /month

880,000 calls / month
15 requests / second
Hard cap (429 above quota, no overage)
880k calls/month
15 req/sec
Priority support

Business

€84.00 /month

4,700,000 calls / month
40 requests / second
Hard cap (429 above quota, no overage)
4.7M calls/month
40 req/sec
Dedicated SLA

Built by

PremiumApi

Related APIs

Other APIs with overlapping tags.

ADA Ramp API

ADA wheelchair-ramp maths as an API, computed locally and deterministically — the run, landing and slope numbers a builder or accessibility planner sizes a ramp by. The rule the ADA fixes is 1 inch of rise per 12 of run, a maximum 8.33 % slope, so the ramp endpoint turns a rise into the ramp: run = rise × 12 (or × 16 / × 20 for a gentler grade if you have the room), plus the level landings the code requires — a 5-foot landing top and bottom and another between runs whenever the rise exceeds 30 inches — and the total length end to end, so a 24-inch rise needs a 24-foot run and 34 feet overall, while a 36-inch rise breaks into two runs with an intermediate landing for 51 feet. The fit endpoint answers the real-world question: does a ramp for this rise fit the run you have? It returns the minimum run an ADA 1:12 ramp needs, whether your space is enough, and the slope you would actually get if you forced it in — flagging when that exceeds 8.33 % and you need a switchback or a lower rise. Everything is computed locally and deterministically, so it is instant and private. Ideal for construction, accessibility, home-modification and contractor app developers, ramp-estimator and code-check tools, and building software. Pure local computation — no key, no third-party service, instant. Confirm against current ADA and local code. Live, nothing stored. 2 compute endpoints.

api.oanor.com/adaramp-api

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

Dash On-Chain API

Live on-chain data from the Dash (DASH) blockchain — a payments-focused cryptocurrency — via the public Dash Insight explorer, clean JSON and no cache. Dash uses X11 proof-of-work plus a second tier of collateralised masternodes that power InstantSend (near-instant locked payments) and ChainLocks, and an on-chain treasury that funds proposals. Read the chain state (block height, difficulty, peer connections, protocol version and relay fee); fetch a block by height or hash; look up an address's DASH balance, total received and sent and transaction count; or resolve a transaction's block, value, fee, input/output counts and its InstantSend lock status. Read live from Dash, nothing stored. This is Dash's own X11, masternode-tier and InstantSend ledger — distinct from the Bitcoin, Decred, Ergo, Nervos and other on-chain APIs and from price feeds.

api.oanor.com/dash-api

Conflux On-Chain API

Live on-chain data from the Conflux (CFX) network — a high-throughput Layer-1 that orders blocks with the Tree-Graph DAG consensus (not a single chain) and runs two spaces: the native Core space (cfx: addresses) and an EVM-compatible eSpace. Served live from a public Conflux Core-space JSON-RPC node as clean JSON. Conflux is distinctive for its storage-collateral model and a built-in proof-of-stake interest rate. Read the chain state (chain id, current epoch, block number, latest-finalized epoch, pending-tx count and the PoS interest rate); the supply (circulating, issued, staked and storage-collateral CFX); a block (the pivot block of an epoch) by epoch number or hash; or a Core-space address's CFX balance and staked balance. Read live from Conflux, nothing cached. This is Conflux's own Tree-Graph, storage-collateral and PoS layer — distinct from the Bitcoin, Decred, Ergo, Nervos and other on-chain APIs and from price feeds.

api.oanor.com/conflux-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Cardano API?

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

What's the rate limit for Cardano 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 Cardano API cost?

Cardano API has a free tier with 100 calls / month. Paid plans start at €12.00 / 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 Cardano API GDPR-compliant?

All requests to Cardano 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.

Account 2

Pool 1

Network 1

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

GET /v1/account

Stake account state + delegation

Playground

Parameters

Custom headers

Language: Client:

GET /v1/assets

Native tokens and NFTs held

Playground

Parameters

Custom headers

Language: Client:

GET /v1/pool

Stake pool live economics

Playground

Parameters

Custom headers

Language: Client:

GET /v1/network

Live chain state + epoch

Playground

Custom headers

Language: Client:

Code snippets

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

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

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

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Cardano API

API health

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Related APIs

ADA Ramp API

Chain Stats API

Dash On-Chain API

Conflux On-Chain API

Frequently asked questions

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