API · /stateproof-api

State Proof API

healthy 4,546 Subscribers

Fetch verifiable Merkle-Patricia proofs of EVM account and storage state, live, via the chain's public JSON-RPC (eth_getProof, no key). For any address it returns the account's nonce, balance, code hash and storage hash together with the Merkle account proof; for any storage slot it returns the value and its storage proof; and it exposes the block's state, transactions and receipts roots — the roots those proofs verify against. This is the light-client and cross-chain-verification primitive: prove that an account existed or that a storage value was exactly what you claim at a given block, without trusting an indexer. Used by bridges, rollup verifiers, light clients and audit tooling, across Ethereum, Base, Arbitrum, Optimism, BNB, Polygon and more. Reads straight from the chain; live, short cache only.

#proof #merkle #evm #lightclient #getproof #onchain #crypto

api.oanor.com/stateproof-api

Get an API key Try in playground → Contact provider

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

/api/stateproof-api/openapi.json

/api/stateproof-api/llms.txt

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

State Proof API — live data on the oanor API marketplace

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 106 ms; Server probes · 24h
Subscribers: 4,546; active
Total calls: 52; last 7 days

Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

5,100 calls / month
3 requests / second
Hard cap (429 above quota, no overage)
5,100 calls/month
3 req/sec
Account + storage proofs
No credit card

Starter

€12.40 /month

102,000 calls / month
8 requests / second
Hard cap (429 above quota, no overage)
102k calls/month
8 req/sec
Block roots
Email support

Pro

€41.50 /month

680,000 calls / month
20 requests / second
Hard cap (429 above quota, no overage)
680k calls/month
20 req/sec
Multi-chain (10+ chains)
Priority support

Business

€123.00 /month

4,350,000 calls / month
50 requests / second
Hard cap (429 above quota, no overage)
4.35M calls/month
50 req/sec
Commercial use
Dedicated SLA

Built by

PremiumApi

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Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for State Proof API?

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

What's the rate limit for State Proof 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 State Proof API cost?

State Proof API has a free tier with 100 calls / month. Paid plans start at €12.40 / 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 State Proof API GDPR-compliant?

All requests to State Proof 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.

Proofs 3

Meta 1

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

GET /v1/account

Account state + Merkle account proof

Playground

Parameters

Custom headers

Language: Client:

GET /v1/roots

Block state/transactions/receipts roots to verify proofs against

Playground

Parameters

Custom headers

Language: Client:

GET /v1/storage

Storage value(s) + storage proof(s)

Playground

Parameters

Custom headers

Language: Client:

GET /v1/meta

Service metadata, supported chains & live sample

Playground

Custom headers

Language: Client:

Code snippets

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

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

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

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State Proof API

API health

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Related APIs

WEMIX API

Monad API

Superposition API

Matchain API

Frequently asked questions

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