# Data Vending — Expert Consultation Session Voucher (consult.expert_session.v1)

> Data Vending — Expert Consultation Session Voucher (consult.expert_session.v1) is a paid API for AI agents from data-vending.869biz.com, paid per call via x402, $65/call, status unknown (last checked 2026-10-11).

Purchases and delivers a voucher for an expert consultation session, paid via x402/USDC, returning a scheduling URL and voucher ID with no API key required.

## Facts

- Endpoint: GET https://data-vending.869biz.com/v1/datasets/consult.expert_session.v1/download?utm_source=zero.xyz
- Price: $65/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/data-vending-expert-consultation-session-voucher-consult-expert-48592f7c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J2ARFjxoCMJ1EifgcGHlR

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 data-vending-expert-consultation-session-voucher-consult-expert-48592f7c
```

Example prompt: I want to buy an expert consultation session voucher — I already have a quote ID from the quote endpoint, so please complete the purchase using Base USDC and give me the scheduling link to book my session.

## When to prefer this

Use this endpoint when an AI agent needs to autonomously purchase a consultation session voucher without human signup or API key provisioning, paying $65 USDC via x402 on Solana or Base, and immediately obtaining a scheduling link. Prefer this over traditional booking or payment APIs when the agent operates in a crypto-native, permissionless environment.

## Known failure modes

- Invalid or expired quote_id returns an error or rejected payment
- Unsupported rail_id value (not solana-usdc or base-usdc) causes validation failure
- Insufficient USDC balance causes payment failure via x402
- Voucher already redeemed or expired returns error on scheduling
- Network or blockchain confirmation delays may cause timeouts

## How this service works

HTTP-native dataset vending for autonomous AI agents. No signup, no API key — discover, pay USDC via x402, get clean JSON. Human-designed data with provenance and conservation revenue share.

## Output

A JSON object containing the SKU (consult.expert_session.v1), number of units purchased, an expiry date, a unique voucher_id, and a schedule_url with the voucher embedded as a query parameter for booking the consultation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "rail_id": {
   "type": "string",
   "description": "Payment rail: solana-usdc or base-usdc"
  },
  "quote_id": {
   "type": "string",
   "description": "Quote id from GET .../quote"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "consult.expert_session.v1",
  "units": 1,
  "expires_at": "2026-06-14T00:00:00.000Z",
  "voucher_id": "vch_example",
  "schedule_url": "/?consult=vch_example"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/data-vending-expert-consultation-session-voucher-consult-expert-48592f7c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from data-vending.869biz.com](https://www.zero.xyz/host/data-vending.869biz.com/llms.txt)