# TradeAPEX Related Concepts

> TradeAPEX Related Concepts is a paid API for AI agents from tradeapex.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-20).

Returns semantically related concepts for a given English word or short phrase using a self-derived semantic model (no transformer), with measured class-separation AUC of 0.846.

## Facts

- Endpoint: GET https://tradeapex.ai/x402/related?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tradeapex-related-concepts-376594b5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_1iU056yhSoQcH5swEjcfW

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 tradeapex-related-concepts-376594b5
```

Example prompt: What are the 10 concepts most semantically related to 'momentum' according to TradeAPEX's own semantic model?

## When to prefer this

Choose this endpoint when you need lightweight, fast semantic concept expansion without the overhead of transformer-based embeddings. It is well-suited for finance and trading domain vocabulary, keyword enrichment, or any scenario where you want to discover conceptually related terms from a proprietary self-derived semantic model. Prefer it over general-purpose embedding APIs when cost per call and simplicity matter, and when the domain of interest aligns with TradeAPEX's training corpus.

## Known failure modes

- Input term contains non-letter characters — only English letters are accepted
- Term is unknown to the model — returns empty or no results but is not charged
- k parameter out of range (must be 1–25) — request rejected
- Missing required 'term' query parameter — returns error
- Non-GET HTTP method used — unsupported method error

## How this service works

Related concepts for a word or short phrase, from a self-derived semantic model (no transformer). Measured class-separation AUC 0.846. Unknown words are not charged.

## Output

A ranked list of up to k (default or specified, max 25) English words or short phrases that are semantically related to the input term, derived from a proprietary semantic model with AUC 0.846. Unknown input words are not charged.

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "term"
     ],
     "properties": {
      "k": {
       "type": "integer",
       "maximum": 25,
       "minimum": 1,
       "description": "number of related concepts"
      },
      "term": {
       "type": "string",
       "description": "a word or short phrase, English, letters only"
      }
     }
    }
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tradeapex-related-concepts-376594b5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tradeapex.ai](https://www.zero.xyz/host/tradeapex.ai/llms.txt)