# SigmaGrid Fair Value Signal

> SigmaGrid Fair Value Signal is a paid API for AI agents from api.sigmagrid.app, paid per call via x402, $0.02/call, status down (last checked 2026-10-13).

Returns a real-time quantitative fair-value signal for a given stock ticker, gated via x402 micropayment.

## Facts

- Endpoint: POST https://api.sigmagrid.app/v1/fair-value/%7Bticker%7D?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sigmagrid-fair-value-signal-6c9877d3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4R8sigugsxSqxA8LHrq5g

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sigmagrid-fair-value-signal-6c9877d3 -d '<json body>'
```

Example prompt: What's the current fair-value signal for NVDA from SigmaGrid — I want to see if it's over or underpriced for my algo trading strategy.

## When to prefer this

Use this endpoint when you need a real-time, model-derived fair-value signal for a specific equity ticker to feed into an algorithmic trading strategy. Prefer this over general market data APIs when you specifically want a quantitative valuation signal rather than raw price or volume data.

## Known failure modes

- Invalid or unrecognized ticker symbol returns a 4xx error
- Payment not attached or insufficient USDC balance causes x402 payment-required response
- Ticker not covered by SigmaGrid model returns empty or error
- Rate limiting or service unavailability returns 5xx

## How this service works

Real-time quantitative signals for algorithmic trading, gated via the x402 payment protocol.

## Output

A real-time quantitative fair-value estimate for the requested ticker, likely including a price signal or valuation metric usable in algorithmic trading decisions.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sigmagrid-fair-value-signal-6c9877d3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.sigmagrid.app](https://www.zero.xyz/host/api.sigmagrid.app/llms.txt)