# Ascended transitions · Elysium API · Femtos

> A message when a launch crosses your thresholds, in the block where it happens.

- 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` (or `X-API-KEY: $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/ws-ascend-status

WebSocket: get a ticket (`POST https://api.femtos.xyz/v1/ws-ticket` with your key), connect to `wss://api.femtos.xyz/v1/ws?ticket=$TICKET`, send the frame below; the first message has `"snapshot": true`. Details: https://femtos.xyz/agents.md#websocket

## Ascended transitions — WS `ascend.status`

A message when a launch crosses your thresholds, in the block where it happens.

| Param | In | Example or values |
|---|---|---|
| `min_mcap_usd` | filter | `50000` |
| `min_holders` | filter | `20` |
| `token` | filter | (optional) |

```json
{"op":"subscribe","channel":"ascend.status","filter":{"min_mcap_usd":"50000","min_holders":"20"}}
```

| Field | Type | Meaning |
|---|---|---|
| `snapshot: true` | object[] | {token, symbol, pair, status, ascend} of the last 50 launches |
| `data.kind` | ascended \| lost \| criterion | status became ascended, left it, or one criterion flipped |
| `data.crossed[]` | object | {criterion, met} |
| `data.ascend` | object | progress after the block |
| `min_volume_usd · max_top10_share` | filter | more thresholds; none at all: refused |

## Related (Launches)

- [New launches](https://femtos.xyz/elysium/launches.md): Latest Ascend launches, newest first, with live market figures.
- [Launches stream](https://femtos.xyz/elysium/ws-launches.md): One message per new launch, the moment its block is indexed.
- [Ascend swaps stream](https://femtos.xyz/elysium/ws-ascend-swaps.md): Every swap of every Ascend pool, one message per block.

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