API · /storageslot-api

Storage Slot API

healthy 3,963 Subscribers

Read any smart contract's raw EVM storage live via the chain's public JSON-RPC, decode each 32-byte word as an address, uint or bool, and resolve proxy implementation pointers across every common proxy standard — EIP-1967, EIP-1822/UUPS and the legacy OpenZeppelin/zeppelinos slot, plus beacon proxies. This is how you find out what a proxy actually points to, who its admin is, or what a contract is storing — even for unverified contracts where source and ABI are unavailable. Give it a chain and an address: read one slot, scan the first N slots to peek at the state layout, or auto-resolve the proxy implementation. The on-chain state-inspection layer for auditors, upgrade monitors and security tooling, across Ethereum, Base, Arbitrum, Optimism, BNB, Polygon and more. Live, short cache only.

#storage #evm #proxy #eip1967 #slot #security #crypto

api.oanor.com/storageslot-api

Get an API key Try in playground → Contact provider

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

/api/storageslot-api/openapi.json

/api/storageslot-api/llms.txt

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

Storage Slot API — live data on the oanor API marketplace

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 112 ms; Server probes · 24h
Subscribers: 3,963; active
Total calls: 52; last 7 days

Full status page → · 8 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

4,600 calls / month
3 requests / second
Hard cap (429 above quota, no overage)
4,600 calls/month
3 req/sec
Slot read + proxy resolve
No credit card

Starter

€11.40 /month

92,000 calls / month
8 requests / second
Hard cap (429 above quota, no overage)
92k calls/month
8 req/sec
Storage scan
Email support

Pro

€38.50 /month

610,000 calls / month
20 requests / second
Hard cap (429 above quota, no overage)
610k calls/month
20 req/sec
Multi-chain (8+ chains)
Priority support

Business

€112.00 /month

4,100,000 calls / month
50 requests / second
Hard cap (429 above quota, no overage)
4.1M calls/month
50 req/sec
Commercial use
Dedicated SLA

Built by

PremiumApi

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Tezos Bigmaps API

Read Tezos's on-chain key-value storage (bigmaps) live from the public TzKT indexer — no key. A bigmap is Tezos's lazily-deserialised on-chain map: the data structure smart contracts use for the big stuff — token ledgers (who owns what), NFT ownership, allowances and metadata. The Tezos contract explorer lists contracts and their interface, but it cannot browse the bigmaps themselves, read a bigmap's typed key/value schema, or page through its live key-value entries. This opens that. Browse and rank the bigmaps by size with their pointer, owning contract, path (e.g. "ledger"), tags and total/active key counts; read one bigmap's detail and its typed key/value schema (what shape each row's key and value take, e.g. an address-to-nat token ledger); and page through a bigmap's live key-value entries — the actual on-chain data, such as the address-to-balance rows of a token ledger or the owner rows of an NFT collection. The storage / data layer for Tezos explorers, indexers, token dashboards and analytics. Distinct from the Tezos on-chain reader (account state), the smart-contract explorer, the FA-token registry and the .tez naming reader. Live from the indexer; short cache only.

api.oanor.com/tezosbigmaps-api

Arweave Network & Permanent Storage API

The Arweave permaweb — the pay-once-store-forever blockchain — live from the public Arweave gateway, no key, nothing cached. On Arweave you pay a single up-front fee and your data is stored permanently; this is the first Arweave reader in the marketplace. Quote the permanent storage cost for any data size — in winston, AR and US dollars — so apps can show "store this forever for $X" for anything from a 1 KB record to a 1 TB archive (AR/USD priced live). Read the live network info: the weave height, total block count, the number of connected peers and the running node version. And look up any block by height for its independent hash, previous block, timestamp, transaction count and the miner reward pool (in AR). The storage-and-network layer for Arweave wallets, permaweb apps, archivers and analytics. Live from arweave.net.

api.oanor.com/arweave-api

Filecoin API

Live on-chain data from the Filecoin network (FIL), the decentralized storage blockchain where miners are storage providers that pledge real disk capacity: an address's FIL balance, actor type and message count — and, for a storage provider, its raw and quality-adjusted storage power and sector size; storage providers ranked by power with each one's capacity, blocks mined and rewards; a tipset (Filecoin's block) with its height, time, block count and messages; and the chain height, total network storage power and number of active storage providers.

api.oanor.com/filecoin-api

Humidor API

Cigar-humidor maths as an API, computed locally and deterministically — the numbers behind storing cigars right, so you buy the correct humidor and keep it at the perfect humidity. The capacity endpoint works out how many cigars an interior holds: interior volume × a packing efficiency ÷ one cigar's volume, where a cigar is a cylinder of its ring gauge (in 64ths of an inch) and length — a 9 × 7 × 3 inch interior holds about 40 Toros (ring 50, 6 inch) at a realistic 0.62 packing, leaving room for air and a humidification device. The media endpoint sizes the humidification: about one 60 g two-way pack per 25 cigars, replaced roughly every two months, so a 40-cigar humidor wants two packs. The seasoning endpoint covers a brand-new humidor — its Spanish cedar must absorb moisture for about two weeks at 84 % RH (one seasoning pack per 25-cigar capacity, or the distilled-water wipe-down) before any cigars go in, or the dry wood will rob them. Everything is computed locally and deterministically, so it is instant and private. Ideal for cigar-shop and tobacconist apps, humidor-maker product pages, cigar-aficionado and collection-tracker sites, and buying guides. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. For room humidity or dew point use a psychrometric API.

api.oanor.com/humidor-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Storage Slot API?

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

What's the rate limit for Storage Slot 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 Storage Slot API cost?

Storage Slot API has a free tier with 100 calls / month. Paid plans start at €11.40 / 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 Storage Slot API GDPR-compliant?

All requests to Storage Slot 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.

Storage 3

Meta 1

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

GET /v1/proxy

Resolve proxy implementation/admin/beacon across all standards

Playground

Parameters

Custom headers

Language: Client:

GET /v1/scan

Read sequential storage slots, decoded

Playground

Parameters

Custom headers

Language: Client:

GET /v1/slot

Read & decode one storage slot

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/storageslot-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

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

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

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Storage Slot API

API health

Pricing

Built by

Related APIs

Tezos Bigmaps API

Arweave Network & Permanent Storage API

Filecoin API

Humidor API

Frequently asked questions

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