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QuietSignal Directory Gaps
x402
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.
Price / call$0.02
Success—
StatusDown
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.
Example use cases
Identifying underserved API marketplace categories
“Show me the directory gaps in the x402 ecosystem — I want to know which categories have the most unhealthy or missing endpoints so I can figure out where there's room to build a new paid API.”
Filtering gaps by a specific domain
“Pull the QuietSignal directory gaps for the 'finance' category and return up to 50 records so I can see which finance-related API slots are unhealthy or unoccupied.”
Finding high-traffic gap opportunities
“Give me directory gaps that have at least 20 listed endpoints — I want to focus on categories that already have some activity but still show significant health problems.”
Technical details
Endpoint
GEThttps://83-29-153-50.sslip.io/v1/directory-gaps?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"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": []
}
}Tags
x402
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