# X402 Quantitative Strategy Search

> X402 Quantitative Strategy Search is a paid API for AI agents from x402.feld-feder.at, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-16).

Searches and evaluates quantitative trading strategy candidates using train/validation/test splits and returns ranked research results.

## Facts

- Endpoint: POST https://x402.feld-feder.at/v1/quant/strategy-search
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-quantitative-strategy-search-06b9d3df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WoFFi57IARgT6WsmNyYkq

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 x402-quantitative-strategy-search-06b9d3df -d '<json body>'
```

Example prompt: Search for quantitative trading strategy candidates using the strategy-search tool — I want to see which systematic strategies come up as viable candidates based on historical data, including how many were evaluated and how they split across train, validation, and test periods.

## When to prefer this

Choose this endpoint when you need a pay-per-request, agent-native quantitative strategy search that returns structured research output with clear train/validation/test splits. Prefer it over building your own backtesting pipeline when you want fast, deterministic strategy candidate screening without committing to a full research infrastructure. It is particularly useful for AI agents that operate in a micropayment context via x402 and need lightweight, on-demand strategy discovery.

## Known failure modes

- Empty candidates list if no strategies match the criteria
- Payment failure or x402 protocol rejection if USDC payment is not properly attached
- Invalid or malformed request body returning an error
- Timeout if the strategy evaluation computation exceeds limits
- Server-side errors from the feld-feder.at host returning non-200 responses

## How this service works

Pay-per-request data tools for AI agents.

## Output

Returns a JSON object with ok status, a list of strategy candidates (possibly empty), counts of total observations split into train/validation/test sets, the number of evaluated candidates, and a disclaimer noting output is deterministic research only and not financial advice or an order signal.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "title": "QuantStrategySearchRequest",
     "required": [
      "closes"
     ],
     "properties": {
      "top_n": {
       "type": "integer",
       "title": "Top N",
       "default": 5,
       "maximum": 20,
       "minimum": 1
      },
      "closes": {
       "type": "array",
       "items": {
        "type": "number",
        "maximum": 1000000000000,
        "exclusiveMinimum": 0
       },
       "title": "Closes",
       "maxItems": 2000,
       "minItems": 60
      },
      "family": {
       "enum": [
        "sma_crossover",
        "rsi_reversion",
        "both"
       ],
       "type": "string",
       "title": "Family",
       "default": "both"
      },
      "fee_bps": {
       "type": "number",
       "title": "Fee Bps",
       "default": 0,
       "maximum": 100,
       "minimum": 0
      },
      "slippage_bps": {
       "type": "number",
       "title": "Slippage Bps",
       "default": 0,
       "maximum": 100,
       "minimum": 0
      },
      "max_candidates": {
       "type": "integer",
       "title": "Max Candidates",
       "default": 500,
       "maximum": 2000,
       "minimum": 1
      },
      "starting_equity": {
       "type": "number",
       "title": "Starting Equity",
       "default": 10000,
       "maximum": 1000000000,
       "exclusiveMinimum": 0
      }
     },
     "additionalProperties": false
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "ResponseEnvelope[QuantStrategySearchResult]",
     "required": [
      "data"
     ],
     "properties": {
      "ok": {
       "type": "boolean",
       "const": true,
       "title": "Ok",
       "default": true
      },
      "data": {
       "type": "object",
       "title": "QuantStrategySearchResult",
      
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "data": {
   "candidates": [],
   "disclaimer": "Deterministic research output only; not financial advice or an order signal.",
   "observations": 60,
   "test_observations": 9,
   "train_observations": 42,
   "evaluated_candidates": 20,
   "validation_observations": 9
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-quantitative-strategy-search-06b9d3df/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.feld-feder.at](https://www.zero.xyz/host/x402.feld-feder.at/llms.txt)