# QuietSignal Directory Gaps

> QuietSignal Directory Gaps is a paid API for AI agents from 83-29-153-50.sslip.io, paid per call via x402, $0.02/call, status down (last checked 2026-10-12).

Returns a rollup of directory health-gap facts — categories and endpoints that are underserved or unhealthy in the x402/HTTP 402 API directory.

## Facts

- Endpoint: GET https://83-29-153-50.sslip.io/v1/directory-gaps?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: down
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quietsignal-directory-gaps-a7c14bc0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_3g9o6DITKCIfS05meLbMZ

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 quietsignal-directory-gaps-a7c14bc0
```

Example prompt: Can you pull the QuietSignal directory gaps data and show me the top 20 categories where x402 APIs are underserved — specifically categories that have at least 5 listed endpoints?

## When to prefer this

Use this endpoint when you need a machine-readable snapshot of the x402/HTTP 402 API directory's health gaps — specifically to identify categories that are underserved, have unhealthy endpoints, or represent open opportunities for new API builders. Prefer this over general web search or manual directory browsing when you want structured, filterable data about the x402 ecosystem. It is read-only and costs $0.02 USDC per call, making it suitable for periodic opportunity scans or automated market-gap analysis.

## Known failure modes

- No matching gaps found — returns empty opportunities array if filters are too restrictive
- Invalid category string — may return empty results if the category name doesn't match any known directory entry
- limit or min_endpoints out of range — API returns a validation error if values exceed allowed bounds (limit max 100, min_endpoints max 1000)
- Upstream 402 Index unavailable — endpoint may return an error or stale data if the source provider is unreachable
- Payment failure — HTTP 402 response if the $0.02 USDC payment over Base is not completed correctly

## How this service works

QuietSignal Public Data: independent, read-only rollup, wallet, opportunity, and developer-data facts for agents, paid per request with USDC over HTTP 402 on Base.

## Output

A JSON object containing a schema version, the source URL and provider (402index.io), a summary with total, healthy, and unhealthy endpoint counts, a disclaimer about the data's limitations, and an array of opportunity/gap records filtered by the requested category and minimum endpoint count.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 100,
       "minimum": 1,
       "description": "Maximum number of gap records to return"
      },
      "category": {
       "type": "string",
       "maxLength": 80,
       "minLength": 1,
       "description": "Optional case-insensitive directory category filter"
      },
      "min_endpoints": {
       "type": "integer",
       "maximum": 1000,
       "minimum": 1,
       "description": "Only return gaps with at least this many listed endpoints"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "schema": "directory-gaps/v1",
  "source": {
   "url": "https://402index.io/api/v1/opportunities",
   "provider": "402 Index"
  },
  "summary": {
   "total_endpoints": 0,
   "healthy_endpoints": 0,
   "unhealthy_endpoints": 0
  },
  "disclaimer": "Directory health-gap facts are not evidence of buyer demand, revenue, safety, or profit.",
  "opportunities": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quietsignal-directory-gaps-a7c14bc0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 83-29-153-50.sslip.io](https://www.zero.xyz/host/83-29-153-50.sslip.io/llms.txt)