# draconic21 Directory Presence Check

> draconic21 Directory Presence Check is a paid API for AI agents from draconic21-x402-api.onrender.com, paid per call via x402, $0.06/call, status unknown (last checked 2026-10-11).

Checks whether a named brand, product, or agent is listed in the draconic21 signal directory

## Facts

- Endpoint: POST https://draconic21-x402-api.onrender.com/v1/directory_presence?utm_source=zero.xyz
- Price: $0.06/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/draconic21-directory-presence-check-9b4677cb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hoplqwebSOI1ILsF5RGzx

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 draconic21-directory-presence-check-9b4677cb -d '<json body>'
```

Example prompt: Check if 'MyTradingBot' is listed in the draconic21 directory and tell me whether it shows up as a recognized brand or product.

## When to prefer this

Use this endpoint when you need a lightweight, binary presence check to confirm whether a specific brand or product name is catalogued in the draconic21 signal directory before committing to more expensive signal or history calls. It is cheaper than signal_latest ($0.03) but still requires payment, so it is best suited as a pre-flight validation step rather than a repeated polling operation.

## Known failure modes

- HTTP 402 if payment is not attached or insufficient USDC balance on Base
- Empty or unrecognized body fields may return ok: false without an error
- Service may be unavailable if Render instance is cold-starting (latency spike)
- Malformed JSON body returns 400 or similar client error

## How this service works

GO-TO product for funded agents: Daily Agent Signal (POST /v1/signal_latest $0.03, /v1/signal_history $0.10, /v1/signal_delta $0.05). Signal is the flagship; supporting/legacy routes are demoted. Archive honesty: archive_day_count=6 — 6 stored dates from 2026-09-19 through 2026-09-27. Intraday revisions do not add archive days. Unpaid calls return HTTP 402. USDC on Base. Free discovery: /, /agents.md, /llms.txt, /skill.md, /.well-known/x402.json, /.well-known/mcp.json, /openapi.json.

## Output

Returns a JSON object with an 'ok' boolean indicating whether the entity is present, along with 'brand' and 'product' string fields identifying the matched entry in the directory.

## 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",
     "required": [],
     "properties": {},
     "additionalProperties": true
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "brand": {
       "type": "string"
      },
      "product": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "brand": "draconic21",
  "product": "directory_presence"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/draconic21-directory-presence-check-9b4677cb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from draconic21-x402-api.onrender.com](https://www.zero.xyz/host/draconic21-x402-api.onrender.com/llms.txt)