How do the rate limits work?

There is a daily quota that is shared across all your keys, plus a burst limit per minute for each key. On the free plan that is 100,000 calls a day and 300 calls a minute per key. The daily quota resets at 00:00 UTC. Going over either limit returns HTTP 429 with a Retry-After header; GET /api/v1/usage and the X-RateLimit-* response headers show where you stand.

Can I use the free API commercially?

Yes. You can use it in commercial products and services, as long as you show the attribution described below.

Are there paid plans?

Not yet. If you need higher limits, bulk data or custom endpoints, contact us and tell us what you're building.

What uptime can I expect?

Live status and a 90-day uptime history are public on the status page. The free API comes without an SLA.

Free QRL data API — both chains, full history since 2018

Free for personal and commercial use — just show “Powered by Quantascan”. One REST API for QRL and QRL 2.0: blocks, transactions, addresses, validators and QRL-native analytics such as exchange flows, whales and XMSS signatures.

Free

No card needed. Personal and commercial use, with a visible “Powered by Quantascan” link.

Get your free API key Read the docs Download OpenAPI spec

Calls per day: 100,000; shared across your keys
Calls per minute, per key: 300; 5 per second
API keys: 5; one per app or environment
Data: Both chains; full history since 2018

Commercial use allowed
Pro analytics endpoints included
Attribution: show “Powered by Quantascan” with a link

What you get

Generous limits

100,000 calls a day, shared across up to 5 keys, and 300 calls a minute per key (5 per second). Enough for a production dashboard, bot or app.

Commercial use allowed

Build products, dashboards, bots, wallets and apps on the data. The only condition is a visible “Powered by Quantascan” link.

Both chains, full history

QRL since its 2018 genesis and QRL 2.0: blocks, transactions, addresses, tokens, validators and daily time series, behind one REST API.

QRL-native analytics

Exchange flows, whale activity, holder distribution, the rich list and XMSS signature data — the QRL-specific analytics generic data providers don't carry. Included on the free plan.

Honest limits

A real HTTP 429 with Retry-After when you hit a limit, X-RateLimit-Limit, X-RateLimit-Remaining, X-RateLimit-Reset and X-API-Plan headers on every keyed response, and GET /api/v1/usage to check where you stand.

Webhooks

Signed POSTs to your server when a watched address or token contract moves: deposit detection without polling, with retries and reorg follow-ups. The free plan includes 2 endpoints and 25 watched addresses.

Drop-in compatible, plus JSON-RPC

An endpoint in the module/action format most explorer clients already speak, so existing client code only needs a new base URL, and a standard JSON-RPC endpoint for QRL 2.0 wallets and libraries.

CSV export and finality

Per-address CSV exports for tax and accounting, with daily USD prices where available, and a confirmation count plus a finalized flag on every QRL 2.0 transaction.

OpenAPI spec, 90 days' notice

Download /openapi.json to generate a typed client or hand it to an AI coding tool. Breaking changes are announced at least 90 days ahead.

Attribution: show “Powered by Quantascan”

That link is the price of the free API. Put a visible “Powered by Quantascan” text or badge, linking to https://quantascan.io, on every page or screen that shows the data. In apps and command-line tools, put it in the about or credits screen and in your documentation.

Badge in the snippets

HTML

<a href="https://quantascan.io" rel="noopener"><img src="https://quantascan.io/badges/powered-by-quantascan.svg" alt="Powered by Quantascan" width="180" height="40"></a>

Markdown

[![Powered by Quantascan](https://quantascan.io/badges/powered-by-quantascan.svg)](https://quantascan.io)

Plain text

Data: Quantascan (https://quantascan.io)

For apps, command-line tools and docs: put this in your about or credits screen and in your README.

Need higher limits, bulk data or a partnership?

Exchanges, custodians, tax and accounting tools, wallets and researchers: tell us what you're building and what you need.

Talk to us

FAQ about the free API

Common questions about this page

How do the rate limits work?: There is a daily quota that is shared across all your keys, plus a burst limit per minute for each key. On the free plan that is 100,000 calls a day and 300 calls a minute per key. The daily quota resets at 00:00 UTC. Going over either limit returns HTTP 429 with a Retry-After header; GET /api/v1/usage and the X-RateLimit-* response headers show where you stand.
Can I use the free API commercially?: Yes. You can use it in commercial products and services, as long as you show the attribution described below.
What does attribution mean exactly?: Show a visible “Powered by Quantascan” text or badge that links to https://quantascan.io on every page or screen that shows the data. In apps and command-line tools, put it in the about or credits screen and in your documentation. The attribution kit has copy-paste snippets.
Are there paid plans?: Not yet. If you need higher limits, bulk data or custom endpoints, contact us and tell us what you're building.
What uptime can I expect?: Live status and a 90-day uptime history are public on the status page. The free API comes without an SLA.