Summary
Monitors large cryptocurrency transactions on Ethereum and Base networks, helping you track whale activity without manually scanning block explorers. The server connects to a hosted API at whale-alert.api.klymax402.com and requires x402 micropayments to access transaction data. Useful when you're building trading alerts, analyzing market movements, or researching wallet behavior patterns. The repository is minimal with no public documentation on specific tools or prompts exposed, so you'll need to explore the MCP interface directly to see what queries and filters are available. Built by Br0ski777 and deployed as a remote SSE transport server.
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Public tool metadata for what this MCP can expose to an agent.
1 tools
crypto_track_whale_transactionsUse this when you need to track large on-chain transactions (whale movements) on Ethereum or Base. Returns recent high-value transfers in JSON. 1. transactions: array of whale transfers sorted by val2 params
Use this when you need to track large on-chain transactions (whale movements) on Ethereum or Base. Returns recent high-value transfers in JSON. 1. transactions: array of whale transfers sorted by val
Parameters* required
chainstringBlockchain: 'ethereum' or 'base' (default: ethereum)
minValuenumberMinimum transaction value in ETH (default: 100)
Whale Alert API
Whale transaction tracker -- large on-chain transfers with sender, value, USD estimate. Market-moving alerts. Pay-per-call via x402 (USDC on Base L2) -- no API key, no signup, no rate-limit wall.
Part of the klymax402 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.):
{
"mcpServers": {
"whale-alert": {
"url": "https://whale-alert.api.klymax402.com/mcp"
}
}
}
Quickstart -- HTTP (x402)
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, 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 descendingfrom-- sender wallet addressto-- receiver wallet addressvalueEth-- transaction value in ETHvalueUsd-- estimated USD value at time of transfertxHash-- transaction hash for on-chain verificationblockNumber-- block number of the transactiontimestamp-- when the transaction occurred
Example response:
{"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 -- 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 (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
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Plug Mailtrap into your AI workflow and let it handle the email.
Connect Mailtrap MCP →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →Make coding agent sessions - Searchable, Shareable, Vendor-neutral & Scored.
Try For Free →Your agent targets a perfect 10 Code Health score. Deterministic. Every commit.
Try For Free →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
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