Reads Polymarket prediction-market data from the Polygon chain — wallet records (won X of Y, P&L, tags), the market board of who is in per market, GT line vs smart-money line gaps, and smart-money entry feeds, each with sample sizes.
Accepts per-call USDC payments on Solana (mainnet) via x402, using an SPL transfer with the facilitator as fee payer so the payer needs no SOL.
This server has a remotely hosted endpoint. Open its connector listing for connection details, authentication requirements, and setup instructions:
Who is buying the prediction-market line. Polymarket wallet records, the market board (who is in, per market), GT line vs Smart-money line gaps, and the smart-money entry feed. Counts from the Polygon chain, each with its sample size. Paid per call over x402 (USDC on Base or Solana), or free to connect over MCP.
The memecoin tools are paused; everything below is prediction-market data.
route | what | price (USDC) | free |
| one wallet's record: won X of Y, P&L, tag | $0.01 | none |
| who is in, per market | $0.05 | top 3 per board |
| GT line vs Smart-money line gaps | $0.03 | top 3 |
| smart-money entries | $0.05 | newest 3 |
/x402/... is the always-402 door a bazaar validator probes. /v1/pm/... answers the free rows without a
payment and a 402 for the rest. Same prices, one constant in the worker.
Related MCP server: whale-data-mcp
curl -i 'https://api.groundtruths.xyz/x402/v1/pm/board'Sign the requirement and send the payload back in PAYMENT-SIGNATURE (any x402 client does this; @x402/fetch works):
curl -s -H 'PAYMENT-SIGNATURE: <base64 payload>' 'https://api.groundtruths.xyz/x402/v1/pm/board'Each market comes back with its sides, price, $ and wallets, the tagged wallets holding each side (SMART MONEY / WHALE / BOT/MM), the GT line and the Smart-money line. No sportsbook odds and no Kalshi price ever ride these routes.
Base (eip155:8453): USDC, EIP-3009 transferWithAuthorization. A signed message: the payer needs no ETH.
Solana (solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp): USDC SPL transfer with the facilitator as fee payer, so the
payer needs no SOL. Exactly three instructions in order: SetComputeUnitLimit, SetComputeUnitPrice, transfer.
{
"mcpServers": {
"groundtruth": {
"type": "streamable-http",
"url": "https://api.groundtruths.xyz/mcp"
}
}
}Tools: pm_market_board, pm_edges, pm_smart_money_entries, pm_wallet_record, line_check_board, market_heat.
Optional header x-api-key: gt_live_... (free key: https://groundtruths.xyz/account). Without a key: the free rows.
install the skill at https://github.com/groundtruth-now/groundtruth-mcp/tree/main/skills/groundtruthPer chain, because bazaars index per facilitator: Base -> CDP, Solana -> PayAI.
https://groundtruths.xyz/boring#linecheck. A record belongs to a wallet, not a person. Information only, not financial advice.
This server cannot be deployed
Pay-per-call ($0.005-$0.03 USDC) market, on-chain, and prediction-market data API for AI agents and trading bots via x402 — no signup, no API key. Remote MCP server, 28 tools: token security (honeypot/liquidity/counterfeit checks), Hyperliquid oracle-gap risk, kimchi premium, funding APR, DEX slippage, Polymarket arbitrage/liquidity audits, Hyperliquid HIP-4 odds.
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