# TradeAPEX Corpus Expansion

> TradeAPEX Corpus Expansion is a paid API for AI agents from tradeapex.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-22).

Analyzes a text sample from your corpus and returns the top concepts most strongly linked to it that your corpus does not yet cover, along with linking terms and link strength scores.

## Facts

- Endpoint: POST https://tradeapex.ai/x402/expand?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/tradeapex-corpus-expansion-a509ba56
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eeVaFSTF0q8vsRJBvePsq

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-corpus-expansion-a509ba56 -d '<json body>'
```

Example prompt: Look at this article I've been building my research corpus around and suggest the top 10 concepts most strongly linked to it that my corpus doesn't cover yet — I want to know what topics I'm missing and what words connect them: [paste text here]

## When to prefer this

Choose this endpoint when you need to identify semantic gaps in an existing corpus or knowledge base — specifically, which concepts are strongly connected to your content but absent from it. Unlike general-purpose embedding similarity searches, this uses a self-derived semantic model (non-transformer) optimized for concept-level linkage analysis, making it well-suited for corpus expansion planning, content strategy, and knowledge graph enrichment workflows. Prefer it over generic keyword or embedding tools when you want structured link-strength scores alongside gap suggestions.

## Known failure modes

- Text contains fewer than 3 known terms — no charge, no results returned
- Text exceeds 20,000 character limit — request rejected
- k parameter outside 1–25 range — validation error
- Non-English text — poor or no concept matches due to English-only model
- Payment failure via x402 — request not processed

## How this service works

What should your agent read next? Send text from your corpus; get the concepts most strongly linked to it that it does not yet cover, each with the linking terms and measured link strength. Text is not stored. Text with fewer than 3 known terms is not charged.

## Output

Returns up to k concept suggestions, each with the concept name, the terms in the submitted text that link to it, and a measured link strength score indicating how strongly the concept is associated with the submitted text. Concepts already covered by the text are excluded. Text with fewer than 3 known terms is not charged and returns no results.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "k": {
   "type": "integer",
   "maximum": 25,
   "minimum": 1,
   "description": "number of suggestions"
  },
  "text": {
   "type": "string",
   "maxLength": 20000,
   "description": "English text from your corpus"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/tradeapex-corpus-expansion-a509ba56/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)