# Quietforge x402 Pay-Per-Call Endpoint Directory

> Quietforge x402 Pay-Per-Call Endpoint Directory is a paid API for AI agents from qf-api.quietforge-studio.workers.dev, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-12).

Returns a health-probed, on-chain-verified directory of x402 pay-per-call API endpoints with payment statistics, seller addresses, and service metadata.

## Facts

- Endpoint: GET https://qf-api.quietforge-studio.workers.dev/v1/x402/demand?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quietforge-x402-pay-per-call-endpoint-directory-476f1bf4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_x-OIjLSmozHeNA4yECceC

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 quietforge-x402-pay-per-call-endpoint-directory-476f1bf4
```

Example prompt: Show me the top 50 x402 pay-per-call endpoints active in the last 24 hours that have had at least 5 distinct payers, sorted by payment volume.

## When to prefer this

Use this endpoint when you need to discover, filter, or audit active x402 pay-per-call API sellers and their on-chain payment statistics. It is purpose-built for x402 ecosystem discovery and provides verified on-chain payment data rather than self-reported listings. Prefer it over generic API directories when you specifically need USDC-on-Base payment metadata, seller wallet addresses, or want to filter by real payer/payment activity.

## Known failure modes

- Payment not included — returns 402 with x402 payment challenge instead of data
- limit out of range (must be 1–500) — likely 400 or ignored
- pay_to address malformed — may return empty results or 400
- min_payers or min_payments too high — returns empty sellers array with valid totals
- Service temporarily unavailable — Cloudflare Worker timeout or 503

## How this service works

Pay-per-call document conversion, PDF text extraction, headless-browser rendering of a URL or HTML to PNG / JPEG / PDF, a health-probed directory of x402 pay-per-call endpoints, a sudoku generator (solver-verified, technique-graded puzzles as JSON or a print-ready A4/Letter book), a book typesetter (prose manuscript to a KDP-ready interior PDF + editable docx), a crossword generator (verified freeform grid from your clue/answer pairs as JSON or print-ready PDFs), a family tree chart layout engine (descendant / ancestor / hourglass charts from people+families JSON or a GEDCOM file, as verified layout JSON or print-ready poster and tiled PDFs), and a dataset quality audit tool (duplicates, missing values, type consistency, class imbalance, numeric outliers and PII-pattern counts for a CSV/JSON dataset, as JSON or a one-page PDF summary). Payment: x402 (USDC on Base). No signup, no API key.

## Output

Returns a JSON object with aggregate totals (total USD, payment count, addresses scanned, sellers with payment) and a list of individual sellers each including their wallet address, payment count, USD earned, distinct payer count, on-chain vs CDP ratio, service names, and listed prices — scoped to a configurable rolling time window.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "description": "Max rows (1-500, default 100)"
      },
      "pay_to": {
       "type": "string",
       "description": "Return only this seller address (0x..., case-insensitive)"
      },
      "min_payers": {
       "type": "integer",
       "description": "Minimum distinct on-chain payers in the window"
      },
      "min_payments": {
       "type": "integer",
       "description": "Minimum confirmed payments in the window"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asset": "USDC",
  "chain": "eip155:8453",
  "count": 1,
  "totals": {
   "usd": 230.457,
   "payments": 11967,
   "addresses_scanned": 212,
   "sellers_with_payment": 142
  },
  "sellers": [
   {
    "usd": 76.62,
    "pay_to": "0x058d0cc5cc97e61e8a9f38d6d6365bce525921b2",
    "payments": 3831,
    "services": [
     "AX1 Console"
    ],
    "usd_per_day": 76.62,
    "distinct_payers": 125,
    "onchain_over_cdp": 0.684,
    "cdp_calls_per_day": 5604.3,
    "listed_prices_usd": [
     0.02
    ]
   }
  ],
  "generated_at": "2026-09-22T13:34:41Z",
  "window_hours": 24
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quietforge-x402-pay-per-call-endpoint-directory-476f1bf4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from qf-api.quietforge-studio.workers.dev](https://www.zero.xyz/host/qf-api.quietforge-studio.workers.dev/llms.txt)