Whale Alert API

io.github.Br0ski777Published by GitHub account Br0ski777v1.1.0Updated Oct 24, 2026

Track large on-chain whale transactions on Ethereum and Base. x402 micropayment.

The publisher's own server: Alertcamp

VerifiedSSEWeb executableFinanceData & Analytics

Overview

AI-generated overview

A remote MCP endpoint that lets an assistant track large on-chain whale transactions on Ethereum and Base, paid per call in USDC via x402.

What you can do
Track large on-chain whale transfers on Ethereum or Base, filtered by chain and minimum value in ETH, returned as JSON sorted by value descending with sender, receiver, ETH and USD values, transaction hash, block number and timestamp.
When to use it
Useful when an assistant needs recent high-value on-chain transfer data for market-moving activity or on-chain intelligence, rather than wallet balances, token prices or holder distribution.
Requirements
A remote MCP endpoint added by URL; no API key or signup. Calls are paid per call through the x402 protocol in USDC on Base L2, so an x402-aware client with a funded wallet is needed to complete the payment challenge.
Before you install
Each call costs money (listed at $0.008) and is settled in USDC on Base through a wallet, so spending is involved. Payment handling is delegated to the client and third-party facilitators, and the server returns public on-chain data only.

Installation

In SourceWeft

  1. Open Whale Alert API in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Web executable via SSE. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.github.Br0ski777%2Fwhale-alert/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "whale-alert-api": {
      "type": "sse",
      "url": "https://whale-alert.api.klymax402.com/mcp"
    }
  }
}

README

Whale Alert API

[MCP Server] [x402] [License: MIT]

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.):

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, x402-agent-tools, ATXP) handles the 402 -> sign -> retry cycle automatically.

Tools

ToolMethodPathPriceDescription
crypto_track_whale_transactionsPOST/api/whales$0.008Track 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

NameTypeRequiredDescription
chainstringnoBlockchain: 'ethereum' or 'base' (default: ethereum)
minValuenumbernoMinimum 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 -- 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.

License

MIT

Source: README.md at commit c7cecae

Tools

0
SourceWeft has not read this server's tools yet.

Version history

1
  1. v1.1.0LatestSep 16, 2026

Score

50% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declaredRequired10 pts

    Declare the credential headers in the registry entry, or keep the endpoint answering the probe so its auth can be classified.

  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

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