@predge/whale-data-mcp

MCP server that exposes the Predge Whale Data x402 API (Polymarket whale trades + smart-money signals) as tools. Payment is handled under the hood: each paid tool call signs a USDC micropayment via an x402 client — the agent just calls the tool and gets data back. You supply a funded buyer key.

Defaults to Base mainnet (the live Predge API is mainnet-only). Paid tools spend real USDC — typically $0.005–$0.03/call, hard-capped at MAX_PRICE_USD ($0.05 by default) before any money moves. Use a dedicated, low-balance buyer wallet.

Install (one command)

Claude Code:

claude mcp add predge-whale-data \
  -e BUYER_PRIVATE_KEY=0xYOUR_FUNDED_BASE_MAINNET_KEY \
  -e X402_NETWORK=base \
  -- npx -y @predge/whale-data-mcp

Claude Desktop / Cursor / any MCP client — add to the client's MCP config:

{
  "mcpServers": {
    "predge-whale-data": {
      "command": "npx",
      "args": ["-y", "@predge/whale-data-mcp"],
      "env": {
        "BUYER_PRIVATE_KEY": "0xYOUR_FUNDED_BASE_MAINNET_KEY",
        "X402_NETWORK": "base"
      }
    }
  }
}

That's it — the agent gets 19 tools (18 paid routes + 1 free discovery tool). No API keys, no account; the buyer key pays USDC per call on Base or Solana. Fund it with a few dollars of USDC (the facilitator pays gas, so no ETH/SOL needed).

Tools

| Tool | Price | Returns | |---|---|---| | predge_list_endpoints | free | API description + every endpoint with its price/schema (call first) | | predge_whales_latest | ~$0.005 | Latest whale trades ≥$10k (15-min delay). Param: limit (1-100) | | predge_whale_market | ~$0.01 | 7-day whale activity for one market. Param: condition_id | | predge_signals_daily | ~$0.02 | 24h digest: top markets, net flow, largest bets | | predge_wallets_leaderboard | ~$0.01 | Wallets by realized win rate. Params: window (7d|30d), limit | | predge_wallet_profile | ~$0.01 | Wallet score, win rates, categories, last 20 trades. Param: address | | predge_markets_movers | ~$0.005 | Largest YES-price moves. Param: window (1h|6h|24h) | | predge_signals_consensus | ~$0.03 | Edge-verified smart-money net flow + direction per market | | predge_attest ⭐ | ~$0.02 | Flagship. Resolved-outcome attestation — the settled truth for a market (resolved, resolution, resolved_at). Optional side (yes|no) checks whether a past signal/win-rate claim was actually right. Params: condition_id, side | | predge_sports_attest ⭐ | ~$0.02 | Flagship. Ed25519-signed settled game outcome (winner, final score, completed) from ESPN, verifiable offline against Predge's published key. Optional winner (team abbr) → correct. Settle bets / prove a track record on tamper-evident truth. Leagues: nba, wnba, nfl, college-football, mlb, nhl, mls, epl, champions-league, laliga. Params: league, event_id, winner | | predge_kalshi_attest ⭐ | ~$0.02 | Flagship. Ed25519-signed settled Kalshi market resolution (resolved, resolution yes|no, resolved_at) from Kalshi's public API, verifiable offline. Attests the market's own result, not trader data. Optional side (yes|no) → correct. Params: ticker, side | | predge_wallet_attest ⭐ | ~$0.02 | Flagship. Ed25519-signed wallet win/loss track record over resolved markets, verifiable offline — turns a self-reported win rate into signed proof. Param: window (7d|30d, default 30d). Params: address, window | | predge_bets_biggest | ~$0.005 | Top-20 largest single trades across all markets. Param: window (24h|7d) | | predge_signals_daily_category | ~$0.01 | 24h digest scoped to one category. Param: category | | predge_signals_consensus_category | ~$0.02 | Consensus scoped to one category. Param: category | | predge_signals_market | ~$0.01 | Single-market smart-money verdict ("trust this move?"). Param: condition_id | | predge_wallet_history | ~$0.02 | Wallet trade history + running win-rate & PnL curve. Params: address, window (30d|90d|all) | | predge_wallets_compare | ~$0.02 | Compare 2-10 wallets side-by-side + market overlap. Param: addresses | | predge_market_history | ~$0.01 | Price/volume history for one market. Params: condition_id, window (7d|30d|all) |

Every paid result includes a note with the on-chain settle tx. The two Kalshi routes (anonymous institutional flow) are not yet exposed as tools — they activate when Kalshi ingest is enabled; raw x402/HTTP already reaches them.

Config (env)

Paid tools need a funded key for at least one rail — Base (BUYER_PRIVATE_KEY) and/or Solana (SOLANA_BUYER_SECRET). Every paid route's 402 offers both networks; the client pays on whichever it holds a key for (cheapest when both). The facilitator pays the network fee on either rail — the wallet needs USDC only.

| Var | Default | Notes | |---|---|---| | BUYER_PRIVATE_KEY | — | Funded Base-mainnet EVM key (0x…) for the Base rail. | | SOLANA_BUYER_SECRET | — | Optional. Funded Solana-mainnet key (64-number JSON array or base58) for the Solana rail. | | X402_NETWORK | base | Base network: base = mainnet (real USDC), base-sepolia only against a testnet deployment. | | X402_SOLANA_NETWORK | matches X402_NETWORK | solana (mainnet) or solana-devnet. | | SOLANA_RPC_URL | @x402/svm default | Optional custom Solana RPC (public mainnet-beta is rate-limited). | | PREDGE_BASE_URL | prod API | https://x402-api-production-266e.up.railway.app. Override to point at another deployment. | | MAX_PRICE_USD | 0.05 | Any call priced above this is refused before paying. | | PREDGE_MCP_USER_AGENT | predge-whale-data-mcp/0.1.1 | Sent on every request (lets the API attribute MCP traffic). |

The free predge_list_endpoints tool works without any key.

Testnet

To exercise the payment path without real money, point PREDGE_BASE_URL at a Base-Sepolia deployment of the API and set X402_NETWORK=base-sepolia; fund the buyer from faucet.circle.com. (The public prod API is mainnet-only, so testnet needs your own deployment.)

Safety

• Price cap — MAX_PRICE_USD is enforced in the payment selector, so an over-cap call is refused before any money moves (no wasted request).
• Network guard — the client only pays a requirement on the configured network; it won't accidentally settle a mainnet requirement while in testnet mode (or vice-versa).
• No key handling beyond env — the server reads BUYER_PRIVATE_KEY from env, never logs it, and never sends it anywhere but the local signer. Use a dedicated low-balance wallet and keep the key out of version control.

Run from source

git clone https://github.com/predgeAI/whale-data-mcp.git
cd whale-data-mcp && npm install && npm run build
# then point your MCP client's "command" at node with args ["/abs/path/whale-data-mcp/dist/index.js"]

Verify locally

npm run inspect                                        # list tools (no payment)
node dist/dev-list-tools.js predge_list_endpoints      # free call against prod
# paid call (spends real USDC on mainnet):
BUYER_PRIVATE_KEY=0x… X402_NETWORK=base node dist/dev-list-tools.js predge_whales_latest '{"limit":2}'