# Carbon Cashmere Relative Strength (RS) Crypto Rankings

> Carbon Cashmere Relative Strength (RS) Crypto Rankings is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.01/call, status down (last checked 2026-09-15).

Computes Mansfield-style relative strength for 32+ cryptocurrencies versus a configurable base (default BTC), returning RS values at now/7d/30d, cross-sectional rank, rank-delta trends, and strengthening/weakening/neutral classification.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/relative-strength
- Price: $0.01/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-9617ba60
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_l4eXm9TRk4cL3pDwO7OQv

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 api-carbon-cashmere-de-9617ba60
```

Example prompt: Show me the Mansfield relative strength rankings for all coins versus BTC right now, including which ones are classified as strengthening or weakening, and how their RS rank has shifted over the last 7 and 30 days.

## When to prefer this

Use this endpoint when you need Mansfield-style normalized relative strength rankings across a broad crypto universe with historical comparison points (7d, 30d) and explicit trend classification. Prefer this over raw price endpoints when the goal is cross-sectional strength comparison rather than absolute price data, and over generic market cap rankings when directional momentum vs a base asset is what matters.

## Known failure modes

- Invalid or unsupported base asset symbol returns an error
- Requested coin not in the 32+ coin universe returns missing data or error
- Upstream price feed unavailability causes stale or missing RS values
- Rate limiting or payment failure (x402) returns 402 Payment Required
- Internal computation error returns 500 status

## How this service works

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

## Output

Returns a list of 32+ coins each with their RS value normalized to 100 at t=0, RS-now, RS-7d-ago, RS-30d-ago, cross-sectional rank, rank-delta trend figures, and a trend classification label (strengthening/weakening/neutral) relative to the configured base asset (default BTC).

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "base": "BTC",
  "_meta": {
   "disclaimer": "Informational research data only — not investment advice."
  },
  "coins": {
   "ETH": {
    "rank": 5,
    "trend": "strengthening",
    "rs_now": 98.4,
    "rank_delta_7d": -2
   }
  },
  "n_coins": 32
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-9617ba60/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)