# Carbon RWA Trust Score API

> Carbon RWA Trust Score API is a paid API for AI agents from api.carbon-cashmere.de, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Returns composite 8-factor quality/trust scores for tokenized real-world assets (RWAs) across top Stellar issuers, enabling cross-issuer due-diligence and ranking.

## Facts

- Endpoint: GET https://api.carbon-cashmere.de/v1/carbon/rwa/scores
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/api-carbon-cashmere-de-3c0c6286
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YjGCV549xyLaSty6Kp6dA

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-3c0c6286
```

Example prompt: Can you pull the Carbon RWA Trust Scores for the top Stellar issuers and rank them — I want to compare USDC, USDY, BENJI, EUTBL, and USTBL on their 8-factor composite scores, especially reserve attestation and redemption speed?

## When to prefer this

Use this endpoint when you need structured, multi-factor quality scores for tokenized RWAs on Stellar — especially when comparing issuers like USDC, USDY, BENJI, EUTBL, or USTBL across regulatory, audit, and liquidity dimensions. Prefer this over raw on-chain data queries when you need a pre-computed, AI-agent-ready composite score rather than raw blockchain metrics.

## Known failure modes

- Unsupported chain or asset_class filter returns empty results or 400 error
- Issuer not yet covered (outside v1 scope) returns no data
- Rate limiting or payment failure returns 402 or 429
- Stale data if issuer metadata has not been recently updated
- Network timeout returns 503

## How this service works

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## Output

Returns composite trust scores (0–100 or similar scale) for tokenized RWA issuers on Stellar, broken down by 8 factors: on-chain activity, issuer regulation, audit status, reserve attestation, liquidity, holder diversity, redemption speed, and on-chain compliance. Includes cross-issuer rankings and is filterable by chain and asset class.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "count": 5,
  "assets": [
   {
    "chain": "stellar",
    "auditor": "Deloitte",
    "composite": 87.5,
    "regulator": "NYDFS+FinCEN",
    "asset_code": "USDC",
    "asset_class": "stablecoin",
    "issuer_name": "Circle Internet Financial, LLC",
    "methodology_version": "v1.0"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/api-carbon-cashmere-de-3c0c6286/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)