Whale Data MCP Server

@predge/whale-data-mcp

MCP server that exposes the Predge API at https://api.predge.io (signed delivery verdicts for AI-agent payments, Polymarket whale trades, smart-money signals, signed attestations, and free signed UMA settlement risk) 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.

Get a free key

Free pilot key in a minute: https://predge.io/start (no card)

With the MCP server: claude mcp add predge-whale-data -e PREDGE_KEY=pdg_pilot_... -- npx -y @predge/whale-data-mcp (no wallet needed for the calls the key covers, see Optional: a Predge key below).

First call over plain HTTP: a signed delivery verdict for a paid agent call.

export PREDGE_KEY=pdg_pilot_...   # from predge.io/start
curl -s https://api.predge.io/v1/verdicts \
  -H 'content-type: application/json' \
  -H "x-predge-key: $PREDGE_KEY" \
  -d '{"job":{"endpoint":"https://api.example.com/v1/report","expected_content_type":"application/json","required_fields":["rows"]},
       "delivery":{"status":200,"headers":{"content-type":"application/json"},"body":"{\"rows\":[1]}"},
       "payment":{"amount_usd":0.25,"payer":"0xBuyer","payee":"0xMerchant"}}'

The response carries verdict (delivered / not_delivered / inconclusive), reason_codes, an ed25519 attestation and a verify_url. Docs: predge.io/docs#verdicts.

No key? Pay per call over x402 instead: the same request without x-predge-key answers 402 with the price ($0.05), payable in USDC by any x402 client.

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 25 tools (18 paid routes + 7 free tools: discovery, settlement risk, verdict re-read, verdict report, key status, Desk config, record verification). Discovery, settlement risk, verdict re-read and record verification need no key at all. 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).

Optional: a Predge key (PREDGE_KEY)

Set PREDGE_KEY and the server sends it as the x-predge-key header on every request:

• Pilot key, free, from https://predge.io/start (email, no card): the settlement estimate (predge_settlement_estimate) and delivery verdicts (predge_verdict) are free for 30 days, and predge_verdict_report returns your signed monthly report. After the window those calls answer 402 again; with a buyer key they then pay per call.
• Desk key, from https://predge.io/desk (14-day trial): predge_desk_config.

claude mcp add predge-whale-data -e PREDGE_KEY=pdg_pilot_... -- npx -y @predge/whale-data-mcp

The key goes first: a call it covers never pays, even with a buyer key set. Without a key or a buyer wallet, a paid tool returns the API's 402 explanation (price, networks, how to pay, where to get a pilot key) instead of failing opaquely. The key is never logged and never copied into a tool result.

ElizaOS — add to your character file (via @fleek-platform/eliza-plugin-mcp):

{
  "plugins": ["@fleek-platform/eliza-plugin-mcp"],
  "settings": {
    "mcp": {
      "servers": {
        "predge": {
          "type": "stdio",
          "command": "npx",
          "args": ["-y", "@predge/whale-data-mcp"],
          "env": { "BUYER_PRIVATE_KEY": "0xYOUR_FUNDED_BASE_MAINNET_KEY", "MAX_PRICE_USD": "0.05" }
        }
      }
    }
  }
}

Set MAX_PRICE_USD to hard-cap spend — any call above it is refused before payment. Full integration guide (ElizaOS, Claude, raw x402 for non-MCP stacks, spend caps): https://predge.io/docs#whale-data

Tools

Every paid result includes a note with the on-chain settle tx. Not exposed as tools (raw x402/HTTP reaches them; see predge_list_endpoints): the /v1/markets/:id/edge polling pulse, the /v1/onchain/* routes, and the signed-calls / stakes / track-record routes. Paused routes (503 signed_wallet_outputs_paused) have no tool: the wallet track-record attestation /v1/wallets/:address/attest (the predge_wallet_attest tool was removed in 0.3.0), /v1/onchain/pm-activity, /v1/onchain/pm-flows and the free /v1/signal/:address.

Verifying signed records yourself

Every Predge signed record carries an attestation envelope. The rule is published at data.predge.io/canonicalization.md: canonical is the payload as JSON with keys sorted at every level and no whitespace; content_hash = sha256(canonical); signature is ed25519 over the UTF-8 bytes of canonical; the signer must be an active key in https://api.predge.io/.well-known/predge-keys.json (attestation kid 13fa3d18a369e6c7). src/verify.ts implements this with node:crypto only.

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.

predge_list_endpoints, predge_settlement_risk, predge_get_verdict and predge_verify_record work without any key.

Upgrading from 0.1.10 or older: those versions default to a decommissioned API host and every call fails with 404. Upgrade to 0.2.0 (npx -y @predge/whale-data-mcp@latest), or set PREDGE_BASE_URL=https://api.predge.io.

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. PREDGE_KEY is only ever placed in the x-predge-key request header to the Predge API; it is never logged, and an API error that echoes it is redacted.

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 test                                               # unit tests (no network, no payment)
npm run inspect                                        # list tools (no payment)
node dist/dev-list-tools.js predge_list_endpoints      # free call against prod
node dist/dev-list-tools.js predge_settlement_risk '{"market":"<condition id or slug>"}'   # free, signed
# 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}'