# LUMEN B2B Sourcing-5 Pay-per-Request Research

> LUMEN B2B Sourcing-5 Pay-per-Request Research is a paid API for AI agents from lumen-zero-x402.lumen-b2b.workers.dev, paid per call via x402, $15/call, status unknown (last checked 2026-10-12).

Submits a B2B sourcing or procurement research brief for human-reviewed supplier/vendor research, paid per-call via USDC on Base mainnet.

## Facts

- Endpoint: GET https://lumen-zero-x402.lumen-b2b.workers.dev/buy/sourcing-5?utm_source=zero.xyz
- Price: $15/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lumen-b2b-sourcing-5-pay-per-request-research-47ae4611
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n9yPkDESbozR-NSJVASNT

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 lumen-b2b-sourcing-5-pay-per-request-research-47ae4611
```

Example prompt: I need B2B sourcing research on industrial-grade lithium iron phosphate battery cells — we're looking for verified manufacturers who can supply at least 10,000 units per month with UL certification. Can you submit this brief through LUMEN's sourcing service?

## When to prefer this

Choose this endpoint when you need structured, human-reviewed B2B supplier or procurement research and are willing to pay $15 USDC per query on Base mainnet. It is appropriate for non-time-sensitive sourcing briefs where expert human curation adds value over automated results. Not suitable for real-time or fully autonomous procurement workflows, as each result requires individual human approval by LUMEN staff.

## Known failure modes

- Payment not settled on Base mainnet — request is queued but not processed until verified settlement
- Sourcing brief too short (under 12 characters) or too long (over 1200 characters) — schema validation error
- Brief contains confidential or sensitive information not suitable for third-party review — may be rejected
- Human approval step at LUMEN not completed — results delayed indefinitely
- Network or worker error on Cloudflare — generic 5xx response
- Insufficient USDC balance for $15 payment — transaction fails before queuing

## How this service works

Real B2B sourcing and procurement research. Seven paid endpoints on Base mainnet. Payment settlement requires individual human approval by LUMEN. No autonomous purchases.

## Output

Returns a JSON object confirming whether the sourcing brief was accepted (ok: boolean), a product/request ID, a receipt ID for the USDC payment, the amount charged in USD, payment authorization status, and a next-action field describing what happens after the human review step at LUMEN.

## 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": {
      "requirement": {
       "type": "string",
       "maxLength": 1200,
       "minLength": 12,
       "description": "Nonconfidential sourcing brief; 12-1200 characters; queued only after a verified settlement."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "ok",
      "productId",
      "amountUsd"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "status": {
       "type": "string"
      },
      "amountUsd": {
       "type": "number"
      },
      "productId": {
       "type": "string"
      },
      "receiptId": {
       "type": "string"
      },
      "nextAction": {
       "type": "string"
      },
      "paymentAuthorizationVerified": {
       "type": "boolean"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lumen-b2b-sourcing-5-pay-per-request-research-47ae4611/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from lumen-zero-x402.lumen-b2b.workers.dev](https://www.zero.xyz/host/lumen-zero-x402.lumen-b2b.workers.dev/llms.txt)