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Kalshi Prediction Markets

by Kalshi

65 txns
1 agents

About

Access Kalshi prediction markets for real-time odds on elections, economics, and world events. Supports both read-only market data and authenticated trading.

Categories

prediction-marketspredictionstradingelectionseconomicsfinancialmarketsmacrous-governmenttrends

Access Data

For AI Agents

MCP Server

Install the x402 MCP server to let your AI agent access this data with automatic USDC payments on Base.

Required: You need a SerenDB database to store query results.

Get your connection string from the SerenDB Console under your database settings.

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "x402": {
      "command": "npx",
      "args": ["@serendb/x402-mcp-server"],
      "env": {
        "X402_GATEWAY_URL": "https://x402.serendb.com",
        "WALLET_PRIVATE_KEY": "0x...",
        "BASE_RPC_URL": "https://mainnet.base.org",
        "SERENDB_CONNECTION_STRING": "postgresql://..."
      }
    }
  }
}
Claude Code

Replace 0x... with your wallet private key and postgresql://... with your SerenDB connection string.

macOS / Linux
claude mcp add x402 \
  -e X402_GATEWAY_URL=https://x402.serendb.com \
  -e WALLET_PRIVATE_KEY=0x... \
  -e BASE_RPC_URL=https://mainnet.base.org \
  -e "SERENDB_CONNECTION_STRING=postgresql://..." \
  -- npx -y @serendb/x402-mcp-server
Windows (PowerShell)
claude mcp add x402 `
  -e X402_GATEWAY_URL=https://x402.serendb.com `
  -e WALLET_PRIVATE_KEY=0x... `
  -e BASE_RPC_URL=https://mainnet.base.org `
  -e "SERENDB_CONNECTION_STRING=postgresql://..." `
  '--' npx -y @serendb/x402-mcp-server
Gemini CLI

Replace 0x... with your wallet private key and postgresql://... with your SerenDB connection string.

gemini mcp add x402 \
  -e X402_GATEWAY_URL=https://x402.serendb.com \
  -e WALLET_PRIVATE_KEY=0x... \
  -e BASE_RPC_URL=https://mainnet.base.org \
  -e "SERENDB_CONNECTION_STRING=postgresql://..." \
  -- npx -y @serendb/x402-mcp-server
Codex CLI

Replace 0x... with your wallet private key and postgresql://... with your SerenDB connection string.

codex mcp add x402 \
  --env X402_GATEWAY_URL=https://x402.serendb.com \
  --env WALLET_PRIVATE_KEY=0x... \
  --env BASE_RPC_URL=https://mainnet.base.org \
  --env "SERENDB_CONNECTION_STRING=postgresql://..." \
  -- npx -y @serendb/x402-mcp-server
Cursor

Important: Cursor has a 60s timeout. Pre-install globally first: npm install -g @serendb/x402-mcp-server

First, install globally to avoid timeout issues:

npm install -g @serendb/x402-mcp-server

Then add to ~/.cursor/mcp.json:

{
  "mcpServers": {
    "x402": {
      "command": "x402-mcp-server",
      "args": [],
      "env": {
        "X402_GATEWAY_URL": "https://x402.serendb.com",
        "WALLET_PRIVATE_KEY": "0x...",
        "BASE_RPC_URL": "https://mainnet.base.org",
        "SERENDB_CONNECTION_STRING": "postgresql://..."
      }
    }
  }
}

Also works with Windsurf, Zed, and other MCP-compatible clients. See the full setup guide for details.

Full Setup GuideGet Connection Stringnpm Package

For Developers

Direct HTTP API

Access data directly via HTTP using the x402 payment protocol.

How x402 Payments Work
  1. Send your query request to the gateway
  2. Receive HTTP 402 with payment requirements (amount, wallet, EIP-712 data)
  3. Sign the payment authorization with your wallet
  4. Retry request with X-PAYMENT header containing the signature
  5. Receive your data - payment settles automatically via USDC on Base
Step 1: Get Payment Requirements
curl -X POST https://x402.serendb.com/api/proxy \
  -H "Content-Type: application/json" \
  -d '{
    "publisherId": "86809288-8bdf-47e2-835c-d5cbf3f9e96b",
    "agentWallet": "0xYourWalletAddress",
    "request": {
      "method": "GET",
      "path": "/endpoint"
    }
  }'

This returns 402 Payment Required with the payment details you need to sign.

Step 2: Add Payment Header

After signing the EIP-712 authorization, add the base64-encoded signature:

curl -X POST https://x402.serendb.com/api/proxy \
  -H "Content-Type: application/json" \
  -H "X-PAYMENT: <base64-encoded-signature>" \
  -d '{ ... }'
Get Help on Discord

Example Prompts

Copy these prompts to use with your AI assistant. Make sure you have the x402 MCP server configured.

Getting Started
Using the x402 MCP server, query Kalshi to show me the current open prediction markets. List the top 10 events with their titles, categories, and prediction timeframes. What are people betting on right now?
Research
Using the x402 MCP server, analyze Kalshi's prediction market categories: fetch all open markets and group them by category (Politics, Economics, Science, World, etc.). Which category has the most active markets? What does this tell us about trader interests?
Analysis
Using the x402 MCP server, examine political prediction markets on Kalshi: find all markets in the Politics category with timeframes before 2045. Show event titles, strike periods, and whether they're mutually exclusive (single winner vs multiple). What political events are traders most uncertain about?
Comparison
Using the x402 MCP server, compare long-term vs short-term prediction events on Kalshi. Categorize events by timeframe: before 2045 (long-term), before 2050 (medium), specific dates (short-term). Which timeframe has more markets? What types of events appear in each bucket?
discovery
Using the x402 MCP server, find emerging prediction markets on Kalshi: identify events in Science & Technology and World categories that have not yet become mainstream. Show the most interesting fringe predictions. What unconventional bets are available?

Pricing

$0.0005/call

Pay per API call via x402 protocol

Publisher Details

Type: api
Added: December 14, 2025
Cache TTL: 300s