Whale Alert API
Track large on-chain whale transactions on Ethereum and Base. x402 micropayment.
Open source Repository Open in the app JSON README (API)
About
Track large on-chain whale transactions on Ethereum and Base. x402 micropayment.
Details
- Kind
- MCP servers
- Topic
- Finance & crypto
- Publisher
- br0ski777
- Origin
- official
- Category
- ferramentas
- Transport
- sse
- Version
- 1.1.0
- Last push
- 2026-09-02T19:58:10Z
- Repository state
- ativo
- Language
- TypeScript
- License
- MIT
- Added
- 2026-08-29 03:01:44
- Updated
- 2026-08-29 03:01:44
- Origin id
io.github.Br0ski777/whale-alert
README
# Whale Alert API
[](https://whale-alert.api.klymax402.com/mcp)
[](https://x402.org)
[](LICENSE)
Whale transaction tracker -- large on-chain transfers with sender, value, USD estimate. Market-moving alerts. Pay-per-call via [x402](https://x402.org) (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the [klymax402](https://klymax402.com) marketplace -- 100 x402 micropayment APIs for AI agents, one wallet, USDC on Base.
## Quickstart -- MCP
Add to your MCP client config (Claude Desktop, Cursor, ElizaOS, etc.):
```json
{
"mcpServers": {
"whale-alert": {
"url": "https://whale-alert.api.klymax402.com/mcp"
}
}
}
```
## Quickstart -- HTTP (x402)
```bash
curl -X POST "https://whale-alert.api.klymax402.com/api/whales" \
-H "Content-Type: application/json" \
-d '{}'
# -> 402 Payment Required, with an x402 payment challenge in the response body
```
Any x402-aware client ([`@x402/fetch`](https://www.npmjs.com/package/@x402/fetch), [`x402-agent-tools`](https://www.npmjs.com/package/x402-agent-tools), ATXP) handles the 402 -> sign -> retry cycle automatically.
## Tools
| Tool | Method | Path | Price | Description |
|---|---|---|---|---|
| `crypto_track_whale_transactions` | POST | `/api/whales` | $0.008 | Track large on-chain whale transactions |
### `crypto_track_whale_transactions`
Use this when you need to track large on-chain transactions (whale movements) on Ethereum or Base. Returns recent high-value transfers in JSON.
**Parameters**
| Name | Type | Required | Description |
|---|---|---|---|
| `chain` | string | no | Blockchain: 'ethereum' or 'base' (default: ethereum) |
| `minValue` | number | no | Minimum transaction value in ETH (default: 100) |
**Returns**
- `transactions` -- array of whale transfers sorted by value descending
- `from` -- sender wallet address
- `to` -- receiver wallet address
- `valueEth` -- transaction value in ETH
- `valueUsd` -- estimated USD value at time of transfer
- `txHash` -- transaction hash for on-chain verification
- `blockNumber` -- block number of the transaction
- `timestamp` -- when the transaction occurred
Example response:
```json
{"transactions":[{"from":"0xab...","to":"0xcd...","valueEth":500.0,"valueUsd":1552500,"txHash":"0xef...","blockNumber":19845632,"timestamp":"2026-04-13T11:22:00Z"}],"chain":"ethereum","minValue":100,"totalFound":8}
```
**When to use**: detecting market-moving whale activity and smart money flows. Essential for trading signal generation and on-chain intelligence.
**Not for**: wallet balance (use `wallet_get_portfolio`), token prices (use `finance_get_token_price`), holder distribution (use `token_get_holder_analysis`).
## Example agent prompts
- "Track large on-chain transactions (whale movements) on Ethereum or Base"
## Payment
- Protocol: [x402](https://x402.org) -- HTTP-native pay-per-call, no signup, no API key
- Network: Base L2 (`eip155:8453`)
- Asset: USDC
- Facilitator: Coinbase CDP (primary), PayAI (fallback)
- Also reachable via [ATXP](https://atxp.ai) (OAuth-wrapped x402, RFC 9728 protected-resource metadata)
## Part of klymax402
100 x402 micropayment APIs for AI agents -- one wallet, USDC on Base, zero signup.
- Catalog: https://klymax402.com/llms.txt
- Full API reference: https://klymax402.com/llms-full.txt
- Live stats: https://klymax402.com/stats
## License
MIT