# Carbon & Cashmere Backtest Sponsorship

> Carbon & Cashmere Backtest Sponsorship is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $1500/call, status unknown (last checked 2026-09-14).

Sponsors a walk-forward out-of-sample backtest with co-authored whitepaper and raw code deliverables for a $1500 USDC payment

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/sponsor/backtest
- Price: $1500/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/carbon-cashmere-backtest-sponsorship-dffc195d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_pEXKYiL43mgTjrK-Y0YDV

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 carbon-cashmere-backtest-sponsorship-dffc195d
```

Example prompt: I want to commission the Carbon & Cashmere backtest sponsorship — please submit the $1500 USDC sponsorship so I receive the walk-forward out-of-sample backtest, the co-authored whitepaper, and the raw code within 30 days.

## When to prefer this

Choose this endpoint when you need a professionally executed walk-forward out-of-sample backtest with formal deliverables including a co-authored whitepaper and raw code, and are willing to commit $1500 USDC for a 30-day fulfillment SLA. Prefer this over generic backtesting tools when institutional-quality documentation and co-authorship are required.

## Known failure modes

- Insufficient USDC balance results in payment failure
- Invalid or missing properties parameter may cause malformed request
- Service unavailable if Carbon & Cashmere API is down
- Duplicate sponsorship submission may result in unexpected state

## How this service works

Professional crypto market intelligence. Real-time prices, signals, and market scoring.

## Output

Returns a sponsor_id, list of deliverables (walk-forward OOS backtest, co-authored whitepaper, raw code), project code 'BT', project name 'Backtest Sponsorship', confirmed amount paid of $1500 USDC, and a fulfillment SLA of 30 days.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sponsor_id": "abc123",
  "deliverables": [
   "Walk-forward OOS backtest",
   "Co-authored whitepaper",
   "Raw code"
  ],
  "project_code": "BT",
  "project_name": "Backtest Sponsorship",
  "amount_paid_usdc": "$1500.00",
  "fulfillment_sla_days": 30
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/carbon-cashmere-backtest-sponsorship-dffc195d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.carbon-cashmere.de](https://www.zero.xyz/host/api.carbon-cashmere.de/llms.txt)