# What is Aurelia?

> Aurelia is an API for onchain token data. It reads every swap itself and serves prices, charts, trades, holders, wallets and new launches over REST and one WebSocket.

> **Note:** This Aurelia is a crypto data API, at aurelia.build. It has nothing to do with the Aurelia JavaScript framework at aurelia.io.

## What it does

Aurelia indexes every swap on BSC, Solana, Base, Robinhood Chain and Ethereum itself, then serves what it finds to your code. Use it to build a token screener, a trading bot, a wallet tracker, a launch board, or anything else that needs live onchain market data.

| You want | Read |
|---|---|
| A token's price, or 100 at once | [Token price API](https://app.aurelia.build/guides/token-price-api) |
| Charts | [OHLCV candles API](https://app.aurelia.build/guides/ohlcv-candles-api) |
| Every swap of a token, pool or wallet | [DEX trades API](https://app.aurelia.build/guides/dex-trades-api) |
| Who holds a token | [Token holders API](https://app.aurelia.build/guides/token-holders-api) |
| What a wallet made or lost | [Wallet PnL API](https://app.aurelia.build/guides/wallet-pnl-api) |
| Tokens ranked and filtered | [Token screener API](https://app.aurelia.build/guides/token-screener-api) |
| Whether a token looks risky | [Honeypot check API](https://app.aurelia.build/guides/honeypot-check-api) |
| What just launched | [New token launches API](https://app.aurelia.build/guides/new-token-launches-api) |
| All of it, live | [Crypto WebSocket API](https://app.aurelia.build/guides/crypto-websocket-api) |
| All of it, for an AI agent | [MCP server](https://app.aurelia.build/guides/mcp-server) |

## Get started

[The quickstart](https://app.aurelia.build/guides/quickstart) takes you from no account to your first answer in about a minute. For tools and agents there is [llms.txt](https://app.aurelia.build/llms.txt), [the full reference as one file](https://app.aurelia.build/llms-full.txt) and an [OpenAPI description](https://app.aurelia.build/openapi.json).

## Frequently asked questions

### Which chains does Aurelia cover?

BSC, Solana, Base, Robinhood Chain and Ethereum. The same endpoints answer on all of them, and one request can mix chains.

### How much does it cost?

Every account gets 10,000 free credits once, with no card and no subscription. After that, 1,000 credits cost $0.28, or $0.224 on a single deposit of $280 or more, prepaid in USDC on Solana from $5. Most requests cost 1 credit, and a WebSocket message 0.01.

### How do I get an API key?

Sign in with Google at app.aurelia.build, then create a key on your account page. Keys start with `aur_` and are shown once.

### Does it have live data?

Yes. One WebSocket carries trades, candles, token and pool pages, holders, wallet balances and positions, and new launches. See the [WebSocket guide](https://app.aurelia.build/guides/crypto-websocket-api).

### Which launchpads does it follow?

four.meme, flap.sh, Genius, pump.fun, LetsBonk, Raydium LaunchLab and more. See the [full list](https://app.aurelia.build/guides/new-token-launches-api).

### Can AI agents use it?

Yes. Aurelia hosts an [MCP server](https://app.aurelia.build/guides/mcp-server) for Claude, Cursor, VS Code and other agents, and publishes [llms.txt](https://app.aurelia.build/llms.txt) and an [OpenAPI description](https://app.aurelia.build/openapi.json).

### Can it place trades?

No. Aurelia only serves data.

### How does it compare with other token data APIs?

See [eight APIs side by side](https://app.aurelia.build/compare/best-token-data-apis), and the comparisons with [Mobula](https://app.aurelia.build/compare/mobula), [Codex](https://app.aurelia.build/compare/codex), [Birdeye](https://app.aurelia.build/compare/birdeye), [Moralis](https://app.aurelia.build/compare/moralis), [Bitquery](https://app.aurelia.build/compare/bitquery), [CoinGecko](https://app.aurelia.build/compare/coingecko) and [DEX Screener](https://app.aurelia.build/compare/dexscreener), including when each of them is the better fit.