Metengine

MetEngine Data Agent API

Real-time smart money analytics across Polymarket, Hyperliquid, and Meteora. 63 endpoints covering wallet scoring, insider detection, capital flow tracking, and position analysis. Pay per request with USDC on Solana -- no API keys, no accounts, no onboarding friction.

Display Rules

• NEVER truncate or trim wallet/contract addresses. Always show full addresses (e.g. 0x61276aba49117fd9299707d5d573652949d5c977, not 0x6127...c977).
• This applies to all Polymarket (0x hex), Hyperliquid (0x hex), Meteora (base58), condition_ids, token_ids, pool addresses, position addresses, and transaction hashes.

Skill Auto-Update

This skill file may change as new endpoints are added or pricing updates. Keep it fresh by downloading the latest version weekly.

Download the latest skill file:

curl -sL https://www.metengine.xyz/skill.md -o ~/.claude/agents/metengine-data-agent.md

Automate weekly updates (cron):

# Add to crontab: crontab -e
0 0 * * 0 curl -sL https://www.metengine.xyz/skill.md -o ~/.claude/agents/metengine-data-agent.md 2>/dev/null

Check skill version before querying (optional):

# Compare local vs remote version
LOCAL_VER=$(grep '^version:' ~/.claude/agents/metengine-data-agent.md | head -1 | tr -d '"' | awk '{print $2}')
REMOTE_VER=$(curl -sL https://www.metengine.xyz/skill.md | grep '^version:' | head -1 | tr -d '"' | awk '{print $2}')
[ "$LOCAL_VER" != "$REMOTE_VER" ] && curl -sL https://www.metengine.xyz/skill.md -o ~/.claude/agents/metengine-data-agent.md

Agents SHOULD check for updates at the start of a new session if more than 7 days have passed since the last update.

Session Memory (CRITICAL -- Read This First)

Before making ANY API call, check for a memory file at:

~/.claude/agents/metengine-memory.md

This file persists across sessions and stores everything needed to skip setup and make faster queries. If the memory file exists, read it first. It will tell you:

1. Wallet configuration -- path to the Solana keypair, public address, whether SOL/USDC balances were verified
2. Package status -- whether @x402/core, @x402/svm, @solana/kit are already installed and where
3. Client bootstrap -- a working code snippet from the last successful query (copy-paste ready)
4. Endpoint learnings -- which endpoints worked, which timed out, which fallbacks were used
5. Pricing cache -- last-fetched pricing schedule (avoids re-reading the full pricing section)

Memory File Format

Create or update ~/.claude/agents/metengine-memory.md using this template:

# MetEngine Session Memory
<!-- Auto-maintained by agents. Do not delete. -->

## Last Updated
YYYY-MM-DD HH:MM UTC

## Skill Version
<version from frontmatter>

## Wallet
- keypair_path: ~/.config/solana/id.json
- public_address: <base58 pubkey -- NEVER store the private key>
- sol_balance_ok: true/false
- usdc_balance_ok: true/false
- last_balance_check: YYYY-MM-DD

## Packages
- installed: true/false
- install_dir: <path where bun add was run>
- packages: @x402/core, @x402/svm, @solana/kit
- bun_version: <version>

## Client Bootstrap
<!-- Paste the minimal working paidFetch setup here after first successful call -->
```typescript
// <paste the one-time setup + paidFetch function that worked>

Endpoint History

Fallbacks Learned

Quirks Encountered

### Memory Update Rules

Agents MUST update the memory file:

1. **After first successful setup** -- Record wallet path, public address, installed packages, working bootstrap code
2. **After every API call** -- Append to Endpoint History (keep last 10 rows, prune older)
3. **When a fallback is used** -- Record in Fallbacks Learned
4. **When a new quirk is discovered** -- Record in Quirks Encountered
5. **At session end** -- Update `Last Updated` timestamp

### How Memory Saves Tokens

| Without Memory | With Memory | Token Savings |
|---------------|-------------|---------------|
| Read full skill file (2400 lines) to find setup instructions | Skip to Client Bootstrap section | ~80% fewer setup tokens |
| Trial-and-error wallet detection | Read wallet path from memory | ~500 tokens saved |
| Install packages every session | Check `installed: true`, skip | ~200 tokens saved |
| Hit known-broken endpoint, get 504, try fallback | Check Fallbacks Learned, use fallback directly | ~1000 tokens saved per avoided failure |
| Re-discover quirks through errors | Check Quirks Encountered | ~300 tokens saved per quirk |

### Quick Start for Returning Agents

If `~/.claude/agents/metengine-memory.md` exists:

1. Read memory file
2. If wallet and packages are set up: a. Copy the Client Bootstrap code b. Check Fallbacks Learned for the endpoint you need c. Make the API call directly d. Update Endpoint History
3. If wallet or packages NOT set up: a. Follow the Onboarding Path below b. Update memory file after setup

**First-time agents:** Follow the Onboarding Path below, then create the memory file.

### Wallet Security Rules

- **NEVER** read, log, print, or display the contents of any keypair file
- **NEVER** store private keys in the memory file
- **ONLY** store the file path and the public address
- Load the keypair at runtime using `Bun.file(path).text()` or `fs.readFileSync(path)` -- pipe directly into the signer, never into a variable that gets logged

---

## Onboarding Path

Two steps from zero to data:

**Step 1: Verify service is live (free)**

GET https://agent.metengine.xyz/health

**Step 2: Make a paid request**

GET https://agent.metengine.xyz/api/v1/markets/trending?timeframe=24h&limit=5

First call returns `402` with price. Sign payment. Re-send with `PAYMENT-SIGNATURE` header. Receive `200` with data + settlement proof.

Prerequisites: A Solana wallet with SOL (for tx fees) and USDC (for payments). Install `@x402/core`, `@x402/svm`, `@solana/kit`.

---

## Payment Protocol: x402 on Solana Mainnet

Every paid endpoint uses a two-step handshake. No API keys. No accounts. Payment IS authentication.

### Flow

Agent MetEngine Solana | | | |-- GET /api/v1/endpoint ------>| | |<-- 402 + PaymentRequired -----| | | | | | [sign payment locally] | | | | | |-- GET + PAYMENT-SIGNATURE --->| | | |-- verify ------------------>| | |<-- valid -------------------| | | | | | [execute query] | | | | | |-- settle ------------------>| | |<-- tx hash -----------------| |<-- 200 + data + PAYMENT- -----| | | RESPONSE (settlement) | |

### Important: Settle-After-Execute

If the query fails (timeout, server error), no payment is settled. The agent keeps their funds. This is enforced server-side. Only successful `2xx` responses trigger settlement.

### Headers

| Header | Direction | Description |
|--------|-----------|-------------|
| `PAYMENT-REQUIRED` | Response (402) | Encoded payment requirements |
| `X-PAYMENT-REQUIRED` | Response (402) | Duplicate of above for compatibility |
| `PAYMENT-SIGNATURE` | Request | Signed payment payload |
| `X-PAYMENT` | Request | Alternate payment header name |
| `PAYMENT-RESPONSE` | Response (200) | Settlement proof with tx hash |
| `X-PAYMENT-RESPONSE` | Response (200) | Duplicate of above for compatibility |

### Client Implementation (TypeScript/Bun)

```typescript
import { x402Client, x402HTTPClient } from "@x402/core/client";
import { registerExactSvmScheme } from "@x402/svm/exact/client";
import { toClientSvmSigner } from "@x402/svm";
import { getBase58Encoder, createKeyPairSignerFromBytes } from "@solana/kit";
import type { PaymentRequired, SettleResponse } from "@x402/core/types";

// --- One-time setup ---
const bytes = getBase58Encoder().encode(process.env.SOLANA_PRIVATE_KEY!);
const signer = await createKeyPairSignerFromBytes(bytes);
const client = new x402Client();
registerExactSvmScheme(client, { signer: toClientSvmSigner(signer) });
const httpClient = new x402HTTPClient(client);

// --- Reusable paid fetch ---
const BASE_URL = "https://agent.metengine.xyz";

async function paidFetch(
  path: string,
  options?: { method?: string; body?: Record<string, unknown> },
): Promise<{ data: unknown; settlement: SettleResponse; price: number }> {
  const method = options?.method ?? "GET";
  const url = `${BASE_URL}${path}`;
  const fetchOpts: RequestInit = { method };
  if (options?.body) {
    fetchOpts.headers = { "Content-Type": "application/json" };
    fetchOpts.body = JSON.stringify(options.body);
  }

  // Step 1: Get 402 with price
  const initial = await fetch(url, fetchOpts);
  if (initial.status !== 402) throw new Error(`Expected 402, got ${initial.status}`);
  const body = await initial.json();

  // Step 2: Parse payment requirements
  const paymentRequired: PaymentRequired = httpClient.getPaymentRequiredResponse(
    (name) => initial.headers.get(name), body,
  );
  const price = Number(paymentRequired.accepts[0]!.amount);

  // Step 3: Sign payment
  const paymentPayload = await httpClient.createPaymentPayload(paymentRequired);
  const paymentHeaders = httpClient.encodePaymentSignatureHeader(paymentPayload);

  // Step 4: Re-send with payment
  const paid = await fetch(url, {
    ...fetchOpts,
    headers: { ...fetchOpts.headers as Record<string, string>, ...paymentHeaders },
  });
  if (paid.status !== 200) {
    const err = await paid.json();
    throw new Error(`Payment failed (${paid.status}): ${JSON.stringify(err)}`);
  }
  const paidBody = (await paid.json()) as { data: unknown };

  // Step 5: Extract settlement proof
  const settlement = httpClient.getPaymentSettleResponse(
    (name) => paid.headers.get(name),
  );

  return { data: paidBody.data, settlement, price };
}

Usage Examples

// GET endpoint
const { data, price } = await paidFetch("/api/v1/markets/trending?timeframe=24h&limit=5");
console.log(`Paid $${price} USDC. Got ${(data as any[]).length} markets.`);

// POST endpoint
const { data: intel } = await paidFetch("/api/v1/markets/intelligence", {
  method: "POST",
  body: { condition_id: "0xabc123...", top_n_wallets: 10 },
});

NPM Dependencies

bun add @x402/core @x402/svm @solana/kit

Pricing

All prices are in USDC on Solana Mainnet. Pricing is dynamic based on endpoint tier, timeframe, limit, and filter usage.

Tier Base Costs

Price Modifiers

Timeframe multiplier (applied to base cost):

Limit multiplier: price *= max(1, requested_limit / default_limit)

Filter discounts (reduce scan cost):

Special rules:

• wallets/compare: price *= wallets.length / 2
• hl/traders/compare: price *= traders.length / 2
• meteora/lps/compare: price *= owners.length / 2
• wallets/profile: both includes=1.0x, one include=0.7x, neither=0.4x
• wallets/top-performers without category: 2.0x penalty

Hard caps:

• /api/v1/markets/opportunities: max $0.15
• /api/v1/wallets/copy-traders: max $0.12

Global bounds: Floor $0.01, Ceiling $0.20 per request.

Machine-Readable Pricing

GET https://agent.metengine.xyz/api/v1/pricing

Returns the full pricing schedule as JSON including all tiers, routes, multipliers, discounts, and special rules. Free endpoint. No payment required.

Capability Manifest

Polymarket (27 endpoints)

Hyperliquid (18 endpoints)

Meteora (18 endpoints)

Complete Endpoint Reference

Response Envelope

All 200 responses use the format: { "data": <payload> }

All error responses use: { "error": "<message>" } with optional "reason" field.

POLYMARKET

1. GET /api/v1/markets/trending

Trending markets with volume spikes.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "condition_id": "string",
      "question": "string",
      "category": "string",
      "period_volume_usdc": "number",
      "period_trade_count": "number",
      "volume_spike_multiplier": "number",
      "smart_money_wallets_active": "number",
      "smart_money_net_direction": "string",
      "buy_sell_ratio": "number",
      "leader_price": "number"
    }
  ]
}

2. GET /api/v1/markets/search

Search markets by keyword, category, status. Accepts Polymarket URLs as the query param.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "condition_id": "string",
      "question": "string",
      "category": "string",
      "end_date": "string (ISO 8601)",
      "status": "string",
      "total_volume_usdc": "number",
      "smart_money_outcome": "string | null",
      "smart_money_wallets": "number",
      "has_contrarian_signal": "boolean",
      "leader_price": "number"
    }
  ]
}

3. GET /api/v1/markets/categories

List all categories with activity stats.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "name": "string",
      "active_markets": "number",
      "period_volume": "number",
      "period_trades": "number",
      "unique_traders": "number"
    }
  ]
}

4. GET /api/v1/platform/stats

Platform-wide aggregate stats.

Parameters (query string):

Response schema:

{
  "data": {
    "timeframe": "string",
    "total_volume_usdc": "number",
    "total_trades": "number",
    "active_traders": "number",
    "active_markets": "number",
    "resolved_markets": "number",
    "smart_wallet_count": "number",
    "avg_trade_size_usdc": "number"
  }
}

5. POST /api/v1/markets/intelligence

Full smart money intelligence report on a specific market.

Request body (JSON):

Response schema:

{
  "data": {
    "condition_id": "string",
    "question": "string",
    "category": "string",
    "end_date": "string",
    "outcomes": "object",
    "smart_money": {
      "consensus_outcome": "string",
      "consensus_strength": "number",
      "by_outcome": {
        "<outcome_name>": {
          "wallet_count": "number",
          "total_usdc": "number",
          "percentage": "number",
          "top_wallets": [
            {
              "wallet": "string",
              "score": "number",
              "tags": ["string"],
              "usdc_invested": "number",
              "net_position": "number",
              "avg_buy_price": "number"
            }
          ]
        }
      }
    },
    "dumb_money": {
      "consensus_outcome": "string",
      "contrarian_to_smart": "boolean",
      "by_outcome": "object"
    },
    "signal_analysis": {
      "smart_vs_price_aligned": "boolean",
      "contrarian_signal": "boolean",
      "signal_summary": "string"
    },
    "recent_activity": {
      "volume_24h": "number",
      "trade_count_24h": "number",
      "buy_sell_ratio": "number",
      "volume_trend": "string"
    }
  }
}

6. GET /api/v1/markets/price-history

OHLCV price/probability time series.

Parameters (query string):

Response schema:

{
  "data": {
    "condition_id": "string",
    "question": "string",
    "category": "string",
    "candles_by_outcome": {
      "<outcome_name>": [
        {
          "bucket": "string (ISO 8601)",
          "token_id": "string",
          "outcome": "string",
          "open": "number",
          "high": "number",
          "low": "number",
          "close": "number",
          "volume": "number",
          "trade_count": "number",
          "vwap": "number"
        }
      ]
    }
  }
}

7. POST /api/v1/markets/sentiment

Sentiment time series with smart money overlay.

Request body (JSON):

Response schema:

{
  "data": {
    "condition_id": "string",
    "question": "string",
    "overall_sentiment": "object",
    "by_outcome": "object",
    "time_series": "array",
    "momentum": "object"
  }
}

8. POST /api/v1/markets/participants

Participant summary by scoring tier.

Request body (JSON):

Response schema:

{
  "data": {
    "condition_id": "string",
    "question": "string",
    "total_wallets": "number",
    "total_usdc": "number",
    "by_outcome": "object",
    "tier_distribution": "object"
  }
}

9. POST /api/v1/markets/insiders

Insider pattern detection using 7-signal behavioral scoring.

Request body (JSON):

Response schema:

{
  "data": {
    "condition_id": "string",
    "question": "string",
    "category": "string",
    "insiders": [
      {
        "wallet": "string",
        "insider_score": "number",
        "signals": "object",
        "outcome": "string",
        "net_shares": "number",
        "buy_usdc": "number",
        "wallet_age_days": "number",
        "first_trade_timestamp": "string"
      }
    ],
    "summary": "object"
  }
}

10. GET /api/v1/markets/trades

Chronological trade feed for a market.

Parameters (query string):

Response schema:

{
  "data": {
    "condition_id": "string",
    "question": "string",
    "category": "string",
    "trade_count": "number",
    "total_volume": "number",
    "trades": [
      {
        "tx_hash": "string",
        "wallet": "string",
        "token_id": "string",
        "outcome": "string",
        "side": "string",
        "price": "number",
        "size": "number",
        "usdc_size": "number",
        "timestamp": "string",
        "wallet_score": "number",
        "wallet_tags": ["string"]
      }
    ]
  }
}

11. GET /api/v1/markets/similar

Related markets by wallet overlap.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "condition_id": "string",
      "question": "string",
      "category": "string",
      "shared_wallet_count": "number",
      "wallet_overlap_pct": "number",
      "total_volume_usdc": "number"
    }
  ]
}

12. GET /api/v1/markets/opportunities

Markets where smart money disagrees with price.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "condition_id": "string",
      "question": "string",
      "category": "string",
      "smart_money_favors": "string",
      "smart_money_percentage": "number",
      "smart_wallet_count": "number",
      "avg_smart_score": "number",
      "price_signal_gap": "number",
      "signal_direction": "string",
      "signal_strength": "string",
      "leader_price": "number",
      "time_until_close": "string"
    }
  ]
}

13. GET /api/v1/markets/high-conviction

High-conviction smart money bets.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "condition_id": "string",
      "question": "string",
      "category": "string",
      "smart_wallet_count": "number",
      "avg_smart_score": "number",
      "total_smart_usdc": "number",
      "conviction_score": "number",
      "favored_outcome": "string",
      "favored_outcome_percentage": "number",
      "entry_vs_current_gap": "number"
    }
  ]
}

14. GET /api/v1/markets/capital-flow

Capital flow by category (sector rotation).

Parameters (query string):

Response schema:

{
  "data": {
    "timeframe": "string",
    "total_net_flow": "number",
    "categories": [
      {
        "category": "string",
        "current_buy_volume": "number",
        "current_sell_volume": "number",
        "current_net_flow": "number",
        "previous_buy_volume": "number",
        "previous_sell_volume": "number",
        "previous_net_flow": "number",
        "net_flow_change": "number",
        "flow_trend": "string"
      }
    ],
    "biggest_inflow": "string",
    "biggest_outflow": "string"
  }
}

15. GET /api/v1/trades/whales

Large whale trades.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "tx_hash": "string",
      "wallet": "string",
      "condition_id": "string",
      "token_id": "string",
      "question": "string",
      "outcome": "string",
      "category": "string",
      "side": "string",
      "price": "number",
      "size": "number",
      "usdc_size": "number",
      "timestamp": "string",
      "wallet_score": "number",
      "win_rate": "number",
      "wallet_tags": ["string"]
    }
  ]
}

Note: This endpoint returns REDEEM trades (resolved market payouts) alongside real trades. Filter by side=BUY or side=SELL to exclude them. REDEEMs have price=1.00 and side=REDEEM.

16. GET /api/v1/markets/volume-heatmap

Volume distribution across categories, hours, or days.

Parameters (query string):

Response schema:

{
  "data": {
    "total_volume": "number",
    "total_trades": "number",
    "breakdown": [
      {
        "label": "string",
        "volume": "number",
        "trade_count": "number",
        "pct_of_total": "number",
        "volume_change_pct": "number",
        "trend": "string"
      }
    ],
    "biggest_gainer": "string",
    "biggest_loser": "string"
  }
}

17. POST /api/v1/wallets/profile

Full wallet dossier.

Request body (JSON):

Response schema:

{
  "data": {
    "wallet": "string",
    "profile": {
      "score": "number",
      "sharpe": "number",
      "win_rate": "number",
      "total_pnl": "number",
      "total_volume": "number",
      "resolved_positions": "number",
      "tags": ["string"],
      "tier": "string",
      "primary_category": "string",
      "is_specialist": "boolean"
    },
    "category_breakdown": "array",
    "active_positions": "array",
    "recent_trades": "array"
  }
}

Note: Wallet addresses MUST be lowercase.

18. POST /api/v1/wallets/activity

Recent trading activity for a wallet.

Request body (JSON):

Response schema:

{
  "data": {
    "wallet": "string",
    "wallet_score": "number",
    "wallet_tags": ["string"],
    "period_summary": "object",
    "trades": "array"
  }
}

19. POST /api/v1/wallets/pnl-breakdown

Per-market PnL breakdown.

Request body (JSON):

Response schema:

{
  "data": {
    "wallet": "string",
    "total_realized_pnl": "number",
    "total_positions": "number",
    "winning_positions": "number",
    "losing_positions": "number",
    "best_trade": "object",
    "worst_trade": "object",
    "positions": "array"
  }
}

20. POST /api/v1/wallets/compare

Compare 2-5 wallets side-by-side.

Request body (JSON):

Response schema:

{
  "data": {
    "wallets": "array of wallet profiles",
    "comparison_winners": "object",
    "category_overlap": "object",
    "shared_positions": "array"
  }
}

Pricing note: Cost scales with wallet count: base * wallets.length / 2.

21. POST /api/v1/wallets/copy-traders

Detect wallets copying a target wallet.

Request body (JSON):

Response schema:

{
  "data": [
    {
      "wallet": "string",
      "overlap_trades": "number",
      "avg_lag_seconds": "number",
      "copied_tokens": "array",
      "wallet_score": "number"
    }
  ]
}

22. GET /api/v1/wallets/top-performers

Leaderboard.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "rank": "number",
      "wallet": "string",
      "period_pnl_usdc": "number",
      "period_roi_percent": "number",
      "period_trades": "number",
      "period_win_rate": "number",
      "overall_score": "number",
      "sharpe_ratio": "number",
      "primary_category": "string",
      "tags": ["string"],
      "active_positions_count": "number"
    }
  ]
}

Pricing note: Queries without a category filter cost 2x due to full-table scan.

23. GET /api/v1/wallets/niche-experts

Top wallets in a specific category.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "wallet": "string",
      "category_sharpe": "number",
      "category_win_rate": "number",
      "category_volume": "number",
      "category_pnl": "number",
      "category_positions": "number",
      "is_specialist": "boolean",
      "volume_concentration": "number",
      "overall_score": "number",
      "tags": ["string"]
    }
  ]
}

24. GET /api/v1/markets/resolutions

Resolved markets with smart money accuracy.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "condition_id": "string",
      "question": "string",
      "category": "string",
      "winning_outcome": "string",
      "end_date": "string",
      "total_volume_usdc": "number",
      "smart_money_correct": "number",
      "smart_money_wrong": "number",
      "smart_money_accuracy": "number"
    }
  ]
}

25. GET /api/v1/wallets/alpha-callers

Wallets that trade early on later-trending markets.

Parameters (query string):

Response schema:

{
  "data": [
    {
      "wallet": "string",
      "market_question": "string",
      "condition_id": "string",
      "entry_date": "string",
      "days_before_resolution": "number",
      "bet_size_usdc": "number",
      "winning_outcome": "string",
      "wallet_score": "number",
      "win_rate": "number"
    }
  ]
}

26. GET /api/v1/markets/dumb-money

Low-score trader positions on a market (contrarian indicator).

**Parameters (query string)

…(truncated)