API reference · Launches
Ascend swaps stream
Every swap of every Ascend pool, one message per block.
- Elysium
- HyperCore: not served
- HyperEVM: not served
- Not on HyperCore: a channel of Elysium only
- Not on HyperEVM: Ascend is an Elysium launchpad; HyperEVM launches (LiquidLaunch): hyperevm.launches
WebSocket channel ascend.swaps on wss://api.femtos.xyz/v1/ws
Parameters
| Param | In | Example or values | Meaning |
|---|---|---|---|
token | filter | (optional) | Launched token: 0x address |
launchpad | filter | (optional) | Launchpad name, e.g. ascend |
side | filter | (empty), buy, sell | buy | sell (of the launched token) |
trader | filter | (optional) | Trader (tx.from): 0x address or a named wallet's handle |
min_usd | filter | (optional) | Minimum USD value |
Subscribe
{"op":"subscribe","channel":"ascend.swaps","filter":{}}Key: Authorization: Bearer $FEMTOS_KEY. Get a free key, or with no browser through agent onboarding.
Response fields
| Field | Type | Meaning |
|---|---|---|
snapshot: true | AscendSwap[] | last 50 matching swaps, chronological |
data | AscendSwap[] | the matching swaps of every Ascend pool in one block, pushed when the indexer commits the block: {token, symbol, pair, launchpad, side, tokens, quoteAmount, usd, priceUsd, mcapUsd, trader, t, …} |
data[].side | buy | sell | Side of the launched token |
data[].priceUsd | decimal | null | Token price after the swap, USD |
data[].mcapUsd | decimal | null | Market cap after the swap, USD |
data[].id | string | <tx>:<log index>, same id as /api/trades and elysium.trades |
data[].block | int | Block |
data[].tx | string | Transaction hash (provenance) |
data[].logIndex | int | Log index of the Swap event (provenance) |
Related: Launches
- Launches GET /v1/launches Elysium, HyperEVM
Latest LiquidLaunch bonding-curve launches, newest first. - Launches stream WS elysium.launches · hyperevm.launches Elysium, HyperEVM
One message per new LiquidLaunch launch, the moment its block is indexed. - Launch detail & signals GET /v1/launches/{token} Elysium, HyperEVM
Metrics, dev wallet, early buyers and risk signals of one launch. - Launch holders GET /v1/launches/{token}/holders Elysium, HyperEVM
Every holder of a launched token, tagged dev or early buyer, with concentration. - Launch timeline GET /v1/launches/{token}/timeline Elysium, HyperEVM
The whole life of a launch as ordered events with running state. - New tokens GET /v1/tokens/new Elysium, HyperEVM
Every ERC-20 created on HyperEVM, newest first, with its first pool and market figures. - New tokens stream WS elysium.tokens.new · hyperevm.tokens.new Elysium, HyperEVM
One message per new token as its block is indexed, and another when its first pool opens. - New pools GET /v1/pools/new Elysium, HyperEVM
Every new pair or pool on HyperEVM, from every discovered factory and PoolManager, newest first. - New pools stream WS elysium.pools.new · hyperevm.pools.new Elysium, HyperEVM
One message per new pool, the moment its block is indexed. - Ascended transitions WS ascend.status Elysium
A message when a launch crosses your thresholds, in the block where it happens. - Lifecycle stage changes WS ascend.lifecycle Elysium
A message when a launched token reaches its next stage: listing desk, HyperEVM mirror, HyperCore spot, perp.
More
- This page as Markdown
- The whole API reference
- What Elysium serves
- The whole API in one Markdown file
- OpenAPI 3.1 document
Agent guide (agents.md)llms.txtOpenAPIMCP serverGet an API keyChangelog