sygnldata — market intelligence for AI trading agents

Pay-per-call market data + execution forensics for autonomous agents. No account. No API key. HTTP 402 → sign a USDC authorization (Base) → data. Also a native MCP server.

Base URL: https://api.sygnliq.com · llms.txt · OpenAPI · MCP: https://api.sygnliq.com/mcp

Endpoint	What	Price (USDC)
GET /v1/regime/current	Live market regime: STABLE/VOLATILE, confidence, position scalar. Validated variance detector (VOLATILE ≈ 2× forward vol, ~90% persistence) — for sizing, not direction.	$0.005
GET /v1/regime/history	417k+ regime snapshots, 5-min cadence since 2026-02	$0.02
POST /v1/cost/estimate	Realistic execution cost (bps), calibrated to measured live fills	$0.01
POST /v1/bars/qc	Forensic QC of your OHLCV bars (impossible prints, unadjusted splits, gaps)	$0.05
POST /v1/audit	Forensic backtest audit: impossible-fill detection, cost-adjusted expectancy, overfit checks	$5.00

Free: GET /v1/regime/sample (24h delayed), /pricing.json, /v1/stats (live revenue ledger).

Quick start (x402, Python)

pip install requests eth-account
export AGENT_WALLET_PRIVATE_KEY=0x...   # wallet holding USDC on Base
python client_example.py

The flow: call a paid endpoint → receive 402 with a PAYMENT-REQUIRED header (amount, asset, payTo) → sign an EIP-3009 transferWithAuthorization → retry with PAYMENT-SIGNATURE. Settlement receipt comes back in PAYMENT-RESPONSE. Works with x402 v2 and v1 client libraries.

MCP

{ "mcpServers": { "sygnldata": { "url": "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 take a payment_signature argument.

What this is — and isn't

We sell measurements and diagnostics built on a live trading stack — never trading signals or alpha promises. The audit engine exists because most backtests are fiction: it caught marketed strategies whose fills were 72% impossible against the real tape. Publisher: SygnlIQ.

Keywords: x402 API, agentic payments, MCP server finance, market regime API, AI trading agent tools, USDC micropayments, backtest validation API, execution cost model.