# Femtos | Chain activity | API reference

> HyperEVM activity per bucket: transactions, wallets and new wallets, contracts, fees, swaps, traders, volume, launches, tokens created and deposits bridged in. GET /v1/activity on Elysium and HyperEVM: parameters, response fields and a live call per layer.

- 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://dashboard.femtos.xyz/signup (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/reference/activity

## Chain activity — GET `/v1/activity`

- Elysium: Elysium activity per bucket: transactions, wallets and new wallets, contracts, fees, swaps, traders, volume, launches, tokens created and deposits bridged in.
- HyperEVM: HyperEVM activity per bucket: transactions, wallets and new wallets, contracts, fees, swaps, traders, volume, launches, tokens created and deposits bridged in.

Layers: Elysium, HyperEVM. Not on HyperCore: HyperCore has no EVM transactions: its trading activity is GET /v1/volume and the markets' 24 h stats (GET /v1/markets).
Page with live calls: https://femtos.xyz/reference/activity?layer=<elysium|hyperevm>

| Param | In | Example or values | Meaning |
|---|---|---|---|
| `layer` | query | `elysium` (Elysium); `hyperevm` (HyperEVM) | EVM layer |
| `interval` | query | `(empty)`, `1m`, `15m`, `1h`, `1d` | Bucket size: 1m, 15m, 1h or 1d |
| `limit` | query | `24` | Buckets, the newest ones (default 120 for 1m, 96 for 15m, 168 for 1h, 90 for 1d) |
| `to` | query | (optional) | End (Unix ms, exclusive; default: none, the newest buckets): the `limit` buckets starting before it. Further back: `to` = the first `t` answered |

Elysium:

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/activity?layer=elysium&interval=1h&limit=24"
```

HyperEVM:

```bash
curl -H "Authorization: Bearer $FEMTOS_KEY" "https://api.femtos.xyz/v1/activity?layer=hyperevm&interval=1h&limit=24"
```

| Field | Type | Meaning |
|---|---|---|
| `coverageFrom` | int \| null | Unix ms of the first bucket held for this layer and interval; null before the first |
| `buckets[]` | object | Oldest first; a bucket is absent when the activity pass did not run then: {t, partial, txs, wallets, newWallets, contracts, feesNative, swaps, traders, volumeUsd, launches, tokens, …} |
| `buckets[].partial` | boolean | true: the bucket is still open (the current one, or one just ended and not yet closed): its figures still move |
| `buckets[].txs` | int | User transactions |
| `buckets[].wallets` | int | Distinct senders of those transactions |
| `buckets[].newWallets` | int \| null | Senders whose first user transaction on the layer is in this bucket; null while the first-seen history is being built (HyperEVM: see coverage in the description) |
| `buckets[].volumeUsd` | decimal | Volume of those swaps, USD (each swap at its price when made) |
| `buckets[].bridgedIn` | object \| null | Deposits from the parent chain; null when not read for this bucket (before the bridge history, or the source unavailable when it closed): {deposits, wallets, usd} |

## Related (Chain & reference)

- [Freshness](https://femtos.xyz/reference/status.md) `GET /v1/status`: Head and lag of each layer, measured now. (Elysium, HyperCore, HyperEVM)
- [Freshness stream](https://femtos.xyz/reference/ws/status.md) `WS status`: The GET /v1/status answer (head and lag of each layer, live feeds), pushed whole on subscribe and at most once a second when it changes. (Elysium, HyperCore, HyperEVM)
- [Blocks stream](https://femtos.xyz/reference/ws/blocks.md) `WS elysium.blocks | hyperevm.blocks`: Each new HyperEVM block header, small and big blocks, from our node. (Elysium, HyperEVM)
- [Gas tracker](https://femtos.xyz/reference/gas.md) `GET /v1/gas`: Every HyperEVM block's base fee, gas used and tips over 1h to 7d, with stats and the latest block. (Elysium, HyperEVM)
- [Gas stream](https://femtos.xyz/reference/ws/gas.md) `WS elysium.gas | hyperevm.gas`: Each new HyperEVM block's base fee, gas used and tips, from our node; the history is GET /v1/gas. (Elysium, HyperEVM)
- [Chain transactions](https://femtos.xyz/reference/activity-transactions.md) `GET /v1/activity/transactions`: HyperEVM user transactions, those that created a contract, and the fees they paid, per bucket. (Elysium, HyperEVM)
- [Chain wallets](https://femtos.xyz/reference/activity-wallets.md) `GET /v1/activity/wallets`: HyperEVM distinct senders of user transactions, and the new ones (first user transaction on the layer), per bucket. (Elysium, HyperEVM)
- [Chain dex volume](https://femtos.xyz/reference/activity-volume.md) `GET /v1/activity/volume`: HyperEVM swaps on the layer's pools, distinct traders, and their USD volume (wash round trips left out), per bucket. (Elysium, HyperEVM)
- [Chain launches](https://femtos.xyz/reference/activity-launches.md) `GET /v1/activity/launches`: HyperEVM tokens launched on a launchpad and ERC-20 tokens created (spam left out), per bucket. (Elysium, HyperEVM)
- [Chain bridged in](https://femtos.xyz/reference/activity-bridged.md) `GET /v1/activity/bridged`: HyperEVM deposits from the parent chain: count, distinct depositors and USD value, per bucket. (Elysium, HyperEVM)
- [Chain activity stream](https://femtos.xyz/reference/ws/activity.md) `WS elysium.activity | hyperevm.activity`: The GET /v1/activity answer of HyperEVM for one interval (its last 120 / 96 / 168 / 90 buckets of 1m / 15m / 1h / 1d), pushed on subscribe, then at each indexed block that moves its open buckets (whole, or as a JSON Patch of the rows that changed). (Elysium, HyperEVM)
- [Block](https://femtos.xyz/reference/block.md) `GET /v1/blocks/{number}`: One HyperEVM block and every transaction in it: who called what, swaps, gas and fees. (Elysium, HyperEVM)
- [Transaction](https://femtos.xyz/reference/tx.md) `GET /v1/tx/{hash}`: One transaction: status, gas, decoded transfers, swaps and liquidity, bridge legs and journey. (Elysium, HyperEVM)
- [Transaction status](https://femtos.xyz/reference/tx-status.md) `GET /v1/tx/{hash}/status`: Where a transaction sent through our HyperEVM RPC is: which upstreams accepted it, its block, or replaced / dropped. (Elysium, HyperEVM)
- [Transaction status stream](https://femtos.xyz/reference/ws/tx-status.md) `WS elysium.tx.status | hyperevm.tx.status`: The inclusion status of one transaction sent through POST /v1/HyperEVM/rpc (eth_sendRawTransaction): the upstreams that accepted it, then its block (success or reverted), or replaced / dropped. A hash not sent through our RPC gets its status from the chain once (included or unknown) and no later frame. With `from` instead of `hash`: every transaction of up to 10 senders, those your account sent through our RPC from the moment an upstream accepts them, the others once they are in a block. (Elysium, HyperEVM)
- [Sent transactions](https://femtos.xyz/reference/rpc-sent.md) `GET /v1/rpc/sent`: The transactions your account sent through our HyperEVM RPC, newest first, with where each one is. (Elysium, HyperEVM)
- [EVM JSON-RPC](https://femtos.xyz/reference/rpc.md) `POST /v1/elysium/rpc | /v1/hyperevm/rpc`: Free HyperEVM RPC by Femtos, read and send (eth_sendRawTransaction), for wallets, dapps and bots, not for indexing (use the Femtos API for history): no key 5 requests a second per IP; a key its plan's limits (free 50/s, 15 transactions/s, up to 2000/s), never metered; batches of 50 with a key, eth_getLogs over 1,000 blocks at most, state of the last 128 blocks only. (Elysium, HyperEVM)
- [Stream stats](https://femtos.xyz/reference/ws/stats.md) `WS stats`: Our HyperCore stream health, once a second. (HyperCore)
- [Check your key](https://femtos.xyz/reference/whoami.md) `GET /v1/whoami`: Answers the name your key is registered under, its tier, billing state and the limits in force. (Elysium, HyperCore, HyperEVM)
- [OpenAPI document](https://femtos.xyz/reference/openapi.md) `GET /v1/openapi.json`: The OpenAPI 3.1 contract of every REST call, public. (Elysium, HyperCore, HyperEVM)

Every page: https://femtos.xyz/reference.md