# Delx JSON-LD Key List

> Delx JSON-LD Key List is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Lists all top-level keys from a caller-supplied JSON-LD or plain JSON object without any network access

## Facts

- Endpoint: POST https://api.delx.ai/api/v1/x402/jsonld-key-list
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/delx-json-ld-key-list-21d01e72
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_O21ArWqqMqE7fJpEhybhD

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 delx-json-ld-key-list-21d01e72 -d '<json body>'
```

Example prompt: List all the top-level keys from this JSON-LD object I have: {"@context":"https://schema.org","@type":"Person","name":"Alice","email":"alice@example.com"}

## When to prefer this

Choose this endpoint when you already hold a JSON or JSON-LD object in memory and simply need a deterministic list of its top-level keys — no network fetching, no upstream APIs, no side effects. It is ideal for lightweight schema inspection, field-presence checks, or preparing a mapping step in a data pipeline. Prefer it over general-purpose code execution or LLM-based JSON inspection when you need a cheap ($0.003), fast, reproducible result.

## Known failure modes

- Non-object input (e.g. bare string or number) may return an error or empty key list
- Malformed JSON that cannot be parsed will result in a parse error response
- Deeply nested structures are not recursed — only top-level keys are returned, which may surprise callers expecting nested key enumeration
- Network or payment issues (x402 authorization failure) will prevent execution

## How this service works

List top-level keys from JSON-LD or JSON objects the caller already holds — call when listing keys from JSON-LD the caller already holds. Use on text/URLs the agent already holds—adjacent to high-volume extract demand, never advertised as general web or X search. Returns deterministic machine-readable JSON for $0.003 USDC via x402 on Base. Execution is first-party, local-only, stateless, and memory-only with no paid upstream, no input retention, and no claim of live chain tip, web search, or me…

## Output

Returns a deterministic, machine-readable JSON response containing an array of all top-level key names found in the submitted JSON or JSON-LD object, with no side effects, no data retention, and no network calls.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "data": {
   "type": "object",
   "description": "JSON object or array of objects whose keys will be listed."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "keys": [
   "@type",
   "name"
  ],
  "shape": "object",
  "schema": "delx/util-jsonld-key-list/v1",
  "key_count": 2
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/delx-json-ld-key-list-21d01e72/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.delx.ai](https://www.zero.xyz/host/api.delx.ai/llms.txt)