# Token metadata · Elysium API · Femtos

> Metadata of up to 100 tokens: supply, creator, logo and socials when indexed, family, spam. Also POST with a JSON body.

- Base URL: `https://api.femtos.xyz/v1` (REST) · `wss://api.femtos.xyz/v1/ws` (WebSocket) · MCP: `https://api.femtos.xyz/mcp`
- Auth: `Authorization: Bearer $FEMTOS_KEY`. Free key: https://femtos.xyz/accounts/ (browser), or with
  no browser: `GET https://femtos.xyz/accounts/agent/challenge`, solve its proof of work, then `POST https://femtos.xyz/accounts/agent/signup`
  (https://femtos.xyz/agents.md#agent-onboarding)
- Decimals are exact strings, times Unix milliseconds, addresses lowercase `0x`
- Whole API in one file: https://femtos.xyz/agents.md · OpenAPI: https://api.femtos.xyz/v1/openapi.json · Index: https://femtos.xyz/llms.txt
- Page with live calls: https://femtos.xyz/elysium/tokens-batch

## Token metadata — GET `/v1/tokens`

Metadata of up to 100 tokens: supply, creator, logo and socials when indexed, family, spam. Also POST with a JSON body.

| Param | In | Example or values | Meaning |
|---|---|---|---|
| `layer` | query | `elysium` | Layer: hyperevm / elysium (0x token addresses) or hypercore (token names HYPE, PURR, token ids, perp coins BTC). Absent: hypercore when every token is a name, else hyperevm |
| `addresses` | query | `<token>` | Comma list of at most 100 token addresses (hypercore: names / ids) |

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/tokens?layer=elysium&addresses=<token>"
```

| Field | Type | Meaning |
|---|---|---|
| `layer` | string | Layer |
| `tokens[]` | object | In the order asked: TokenMeta (hyperevm / elysium) or Coin (hypercore): {address, symbol, name, decimals, totalSupply, creator, createdAt, createdBlock, logo, description, socials, family, …} |
| `missing` | string[] | Asked, not found |
| `asOf` | int \| null | Time of `height`: the layer head the answer is cut at (EVM: indexed head; HyperCore: ingested head) (Unix ms) |
| `height` | int \| null | Head block of the layer the answer is cut at |
| `testnet` | boolean | Elysium testnet: USD values from testnet pools, nominal |
| `syncing` | true | Present while the layer syncs: data only up to dataUntil |
| `dataUntil` | int \| null | Indexed head time while the layer syncs (Unix ms) |

## Related (Market data)

- [Candles](https://femtos.xyz/elysium/candles.md): OHLCV of one pool in pair price, USD and market cap, ascending, UTC-aligned.
- [Forming candle](https://femtos.xyz/elysium/ws-candles.md): The forming candle, pushed once per block where it changes.
- [Trades](https://femtos.xyz/elysium/trades.md): Latest swaps of one pool, newest first.
- [Trades stream](https://femtos.xyz/elysium/ws-trades.md): The swaps of one pool, one message per block that has some.
- [Daily token volume](https://femtos.xyz/elysium/volume.md): USD swap volume of a token per UTC day, both sides of every priced swap. Testnet pool prices.
- [Token transfers](https://femtos.xyz/elysium/transfers.md): ERC-20 Transfer events of one token, newest first.
- [Liquidity events](https://femtos.xyz/elysium/liquidity.md): Liquidity added to and removed from one pool, newest first.
- [Swaps by wallet](https://femtos.xyz/elysium/wallet-trades.md): Every swap a wallet sent (or a pool’s, a token’s), newest first, filterable by token, side, size and time.
- [Transfers by wallet](https://femtos.xyz/elysium/wallet-transfers.md): ERC-20 transfers sent and received by a wallet, newest first, filterable by token, direction, size and time.
- [Pool detail](https://femtos.xyz/elysium/pool.md): One pool: dex, fee, tokens, liquidity in USD, depth, 5m to 24h activity, top LPs.
- [Transaction](https://femtos.xyz/elysium/tx.md): One transaction: status, gas, decoded transfers, swaps and liquidity, bridge legs and journey.
- [Token prices](https://femtos.xyz/elysium/prices.md): USD price of up to 100 tokens in one call, each with its source and provenance.
- [Price history](https://femtos.xyz/elysium/price-history.md): USD closes per unit of up to 25 tokens over a window, or the price of 100 tokens at one time (at=).
- [Token candles](https://femtos.xyz/elysium/token-candles.md): OHLCV of a token in USD through its reference pool, the most liquid one.
- [Token overview](https://femtos.xyz/elysium/token-overview.md): One token across all its pools: price, FDV, market cap, liquidity, windows, holders, top pools.

All Elysium endpoints: https://femtos.xyz/elysium.md