# sygnldata
Machine-readable market intelligence for autonomous agents. Pay per call via x402 (USDC on base); no signup, no API key.

## What you can buy
- GET /v1/regime/current: $0.005 USDC
- GET /v1/regime/history: $0.02 USDC
- POST /v1/cost/estimate: $0.01 USDC
- POST /v1/bars/qc: $0.05 USDC
- POST /v1/audit: $5.0 USDC
- GET /v1/x/agent-economy-directory: $0.01 USDC
- GET /v1/x/perp-funding-rates: $0.005 USDC

## Endpoints
- GET /v1/regime/current — live market regime: STABLE or VOLATILE + confidence + position_scalar. Validated variance detector (VOLATILE ~2x forward vol, ~90% persistence). Use for position sizing, not direction.
- GET /v1/regime/history?start=&end=&limit= — 417k+ historical snapshots since 2026-02.
- POST /v1/cost/estimate {symbol, side, notional_usd, order_type} — realistic execution cost in bps, calibrated to measured fills (SPY/QQQ 1.5bps RT).
- POST /v1/bars/qc — send your OHLCV bars, get a data-quality forensic report (impossible bars, bad prints, unadjusted splits) before you backtest on garbage.
- POST /v1/audit — upload a trade ledger CSV, get a forensic backtest audit: impossible-fill detection, cost-adjusted expectancy, overfitting checks. Powered by sygnliq.com.

## Dynamic product catalog
- GET /v1/x — free machine-readable catalog of additional pay-per-call datasets (agent-economy directory, funding rates, more added continuously)
- GET /v1/x/<slug> — the products themselves (x402 paid)

## MCP
Native MCP server (streamable HTTP) at https://api.sygnliq.com/mcp — tools: get_regime_sample (free), get_pricing (free), get_regime_current, get_regime_history, estimate_execution_cost, check_bar_quality, audit_backtest. Paid tools accept a payment_signature argument (base64 x402 PaymentPayload).

## Free
- GET /v1/regime/sample — 24h-delayed regime snapshot (taste before buying)
- GET /health, /pricing.json, /openapi.json

## Why trust this
Built from a live trading stack whose forensics caught 72% impossible fills in marketed strategies. We sell measurements and diagnostics, not alpha promises.