feat: add QuantOracle — 9 quant finance actions for composite workflows

[fel123]

Summary

Adds QuantOracle to packages/plugin-misc — a deterministic quantitative finance API with 63 underlying calculators + 10 composite workflows. This PR surfaces 9 high-value actions (rather than exposing all 73 endpoints) to keep the scope reviewable.

QuantOracle offers a 1,000 free calls/IP/day tier (no API key, no signup), so the actions work out-of-the-box. Past the free tier, paid endpoints return HTTP 402 with x402 payment requirements (USDC on Base or Solana) — the plugin surfaces a clear error; downstream x402-capable clients can auto-pay if desired.

Actions

Action	Description	Price past free tier
QUANTORACLE_PRICE_OPTION	Black-Scholes + 10 Greeks	$0.005
QUANTORACLE_FULL_RISK_ANALYSIS	Full risk tearsheet (Sharpe, Sortino, VaR, Kelly, DD, Hurst, CAGR)	$0.04 (paid-only)
QUANTORACLE_BACKTEST_STRATEGY	SMA / RSI / momentum / Bollinger backtest	$0.10 (paid-only)
QUANTORACLE_OPTIONS_STRATEGY_OPTIMIZER	Rank options strategies by outlook + vol view	$0.08 (paid-only)
QUANTORACLE_RECOMMEND_HEDGE	Compare protective put / collar / futures / partial hedges	$0.04 (paid-only)
QUANTORACLE_REBALANCE_PLAN	Exact rebalance trades + transaction cost estimate	$0.05 (paid-only)
QUANTORACLE_MONTE_CARLO_SIM	GBM portfolio projection with contributions/withdrawals	$0.015
QUANTORACLE_IMPERMANENT_LOSS	Uniswap v2/v3 IL calculator	$0.005
QUANTORACLE_LIQUIDATION_PRICE	Leveraged position liquidation price	$0.002

File layout

Mirrors `packages/plugin-misc/src/coingecko/`:

```
packages/plugin-misc/src/quantoracle/
├── actions/
│ ├── backtestStrategy.ts
│ ├── computeImpermanentLoss.ts
│ ├── computeLiquidationPrice.ts
│ ├── optimizeOptionsStrategy.ts
│ ├── planRebalance.ts
│ ├── priceOption.ts
│ ├── recommendHedge.ts
│ ├── runFullRiskAnalysis.ts
│ └── runMonteCarlo.ts
└── tools/
└── index.ts # shared fetch helper + per-endpoint methods
```

Plus wiring in `packages/plugin-misc/src/index.ts` (9 action imports + 9 method entries).

Notes

• No new dependencies — uses native `fetch`.
• All actions return `{ status: 'success', result }` on success or `{ status: 'error', message }` on failure, matching the coingecko pattern.
• Zod schemas use minimal typed field shapes (per contributor guidance from PR fix: replace ZodType<any> with minimal schema type to prevent TS OOM #499 about TS OOM).
• Could be the first x402-native integration in the kit — happy to extend to all 73 endpoints in a follow-up.

Links

• API: https://api.quantoracle.dev
• API docs: https://api.quantoracle.dev/docs
• x402 discovery (Base + Solana): https://api.quantoracle.dev/.well-known/x402
• Repo: https://github.com/QuantOracledev/quantoracle

[fel123]

Friendly check-in — this PR has been open for ~13 days with no reviews yet. Happy to address any feedback whenever a maintainer has bandwidth.

Quick status update since opening:

• Live & in production: the underlying API at https://api.quantoracle.dev has been serving real on-chain x402 settlements continuously, including 9 organic paid composite-workflow calls in the last 14 days (backtest, hedging, full-analysis, rebalance) — so this isn't a stub integration.
• Listed in CDP Bazaar: all 73 priced endpoints are auto-indexed at https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources with current lastUpdated timestamps tracking real settlements.
• Multi-chain x402: Base mainnet + Solana mainnet both supported (this is the Solana-relevant part for solana-agent-kit users — paid calls can settle in USDC on Solana directly).
• MCP registry: io.github.fel123/quantoracle@2.4.0 (latest, active).

Scope kept deliberately small (9 high-leverage actions wrapping composite workflows, not all 73 raw endpoints) so the review is tractable. The free tier (1,000 calls/IP/day, no API key) means anyone reviewing this can run the actions end-to-end without paying anything.

Let me know if you'd like me to adjust the action surface, split the PR, or anything else.

[fel123]

Quick update since the May 1 check-in:

Solana-native example shipped today at integrations/agentkit/example-agent-solana.ts — uses SolanaKeypairWalletProvider with networkId="solana-mainnet" and routes x402 paid composites through SPL USDC. Pattern would translate cleanly to a solana-agent-kit action if this PR lands.

Mainnet usage: QuantOracle's x402 endpoints have now processed 171 settled transactions ($2.50 USDC) across Base and Solana, including confirmed Solana mainnet settlements via the Coinbase facilitator. The Solana facilitator route has noticeably lower per-call overhead than Base (sub-second settlement vs ~2s), which makes Solana the better fit for high-frequency agent workflows — exactly the audience solana-agent-kit serves.

Happy to address any feedback whenever a maintainer has bandwidth. Nothing in the PR requires changes from your side; just wanted to flag the new Solana-specific work in case it's helpful context.