How do I authenticate?

Send your key as a Bearer token: Authorization: Bearer YOUR_API_KEY. Keys are managed from your account profile.

How often is the data updated?

ETF flow data for each trading day is published by the next morning, before the US market opens, and spot prices refresh throughout the day.

Which assets are covered?

All US-listed spot crypto ETFs across 16 assets: Bitcoin, Ethereum, Solana, XRP, Hyperliquid, Dogecoin, Chainlink, Avalanche, Hedera, Litecoin, BNB, Polkadot, Sui, NEAR, Tron and Zcash. Flows for the eleven newest assets are computed from issuer filings, because no aggregator publishes them. The CEFI sentiment index ships as a single market-wide composite covering all 16 assets.

Are there rate limits?

The free tier has generous limits suitable for dashboards and research. Higher-volume access is available on request.

Is there an OpenAPI spec or MCP server?

Yes — the API ships with an OpenAPI specification and an MCP server, so you can query the data from AI tools like Claude.

Is this investment advice?

No. The API provides data for informational and research purposes only and is not investment advice.

FREE · API-KEY AUTHENTICATED · NO CARD

CryptoETF Data API for developers and analysts

Access comprehensive ETF flows, fund holdings, indices, and historical data. Built for dashboards, alerts, and research.

Get your free API key Read the API docs →

16 tracked assetsDaily updatesREST + OpenAPI + MCP

# Get Bitcoin spot ETF daily net flows
curl -H "Authorization: Bearer YOUR_API_KEY" \
  https://api.cryptoetf.today/api/v1/flows/btc

base: https://api.cryptoetf.today/api/v1

What the crypto ETF API gives you

Everything you need to build dashboards, alerts, bots and research tools around spot crypto ETF activity.

📈

ETF flows

Daily net inflows and outflows for every US-listed spot crypto ETF across 16 assets — Bitcoin, Ethereum, Solana, XRP, Hyperliquid, Dogecoin, Chainlink, Avalanche, Hedera, Litecoin, BNB, Polkadot, Sui, NEAR, Tron and Zcash — down to the fund level.

🧭

CEFI sentiment index

The 0–100 institutional sentiment index — a single market-wide composite across all 16 tracked assets — from one endpoint.

💵

Live prices

Real-time spot prices and 24-hour change for all 16 tracked assets, refreshed throughout the trading day.

🗂️

Asset directory

Every tracked asset with its ticker, internal id and name — the exact values other endpoints accept as the asset path parameter.

📊

Weekly analytics

Pre-computed weekly flow and AUM summaries, ready for reports and dashboards.

⚡

Daily updates

New flow data every trading day, published by the next morning before the US open.

API endpoints

Every endpoint is a simple authenticated GET against https://api.cryptoetf.today/api/v1. Asset paths accept any of the 16 tracked assets:

btcethsolxrphypdogelinkavaxhbarltcbnbdotsuineartrxzec

Full names work too — bitcoin, dogecoin, chainlink, avalanche, hedera, litecoin, polkadot. Anything else returns 400.

GET/flows/summaryLatest net flows across all 16 tracked assets in one call.

GET/flows/{asset}Daily flow history for a single asset — any of the 16 tickers above.

GET/index/cefiComposite CEFI sentiment index.

GET/tickersDirectory of all 16 tracked assets: symbol, id and name.

GET/pricesCurrent spot prices and 24-hour change for all 16 tracked assets.

GET/analytics/weeklyWeekly flow and AUM analytics per asset.

Full reference & try it →

MCP · AI ASSISTANTS

Query ETF data from your AI assistant

The CryptoETF MCP server gives Claude, Cursor and other AI tools direct access to live ETF flow data — ask in plain language, get real numbers.

Connect in one command

1Choose your client below and copy the snippet.
2Run the command, or paste the JSON into the client's MCP config file — then restart the app if it asks.
3Ask a question in plain language: the assistant calls the tools and reads the live numbers itself.

claude mcp add --transport http cryptoetf https://mcp.cryptoetf.today/api/mcp

Use --scope project to add to your repo's .mcp.json, or --scope user for all projects.

MCP endpoint: https://mcp.cryptoetf.today/api/mcp

5 available tools

get_flows_summaryLatest net ETF flows for all 16 assets (BTC, ETH, SOL, XRP, HYPE, DOGE, LINK, AVAX, HBAR, LTC, BNB, DOT, SUI, NEAR, TRX, ZEC)

get_asset_flows30-day daily flow history for one asset

get_cefi_indexComposite CEFI sentiment score (0–100, 50 = neutral)

get_pricesCurrent spot prices + 24h change for all 16 tracked assets

get_weekly_analytics7-day aggregated flow analytics per asset

Example questions you can ask

“What were Bitcoin ETF flows today?”

“Which crypto asset had the most inflows this week?”

“How much has gone into Dogecoin and Chainlink ETFs so far?”

“What is the current CEFI sentiment index?”

Package, source and registry

npm package@zerosix-studio/cryptoetf-mcpThe stdio bridge on npm — zero dependencies, published with build provenance.Source on GitHubzerosix-studio/cryptoetf-mcpRead the code that npx runs on your machine, open an issue or a pull request.MCP Registryio.github.sly13/cryptoetfThe server in the official Model Context Protocol registry.

Why use the CryptoETF API

Free to start

Generate an API key in seconds — no credit card, no sales call.

Developer-first

Clean REST/JSON, predictable schemas, an OpenAPI spec and an MCP server.

16 assets, one API

Bitcoin, Ethereum, Solana, XRP, Hyperliquid, Dogecoin, Chainlink, Avalanche, Hedera, Litecoin, BNB, Polkadot, Sui, NEAR, Tron and Zcash spot ETFs through one consistent interface.

AI-ready

Connect the MCP server to Claude or Cursor and query crypto ETF data in plain language.

Crypto ETF API — FAQ

Yes. The core API is free with an API key — no credit card required. Generate one in your profile and start calling right away.

Explore the data

See the same crypto ETF flow data powering the API across our live trackers.

Bitcoin ETF flows Ethereum ETF flows Solana ETF flows XRP ETF flows Hyperliquid ETF flows Dogecoin ETF flows Chainlink ETF flows Avalanche ETF flows Hedera ETF flows Litecoin ETF flows BNB ETF flows Polkadot ETF flows Sui ETF flows NEAR ETF flows Tron ETF flows Zcash ETF flows CEFI sentiment index

Need more than the free tier?

Full historical data, higher rate limits, extended analytics or a managed MCP integration — tell us what you're building and we'll set you up.

Get your free API key Contact us