# x402 Apostle Chain — RWA Screen (Real-World Asset Readiness Screener)

> x402 Apostle Chain — RWA Screen (Real-World Asset Readiness Screener) is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-02).

Returns a readiness score and grid metadata for real-world asset (RWA) tokenization readiness in a specified US energy market (Texas, Florida, New York, Oregon)

## Facts

- Endpoint: POST https://twin.unykorn.org/rwa-screen?utm_source=zero.xyz
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-apostle-chain-rwa-screen-real-world-asset-readiness-screener-50488aae
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Q5k-AHcNFULCz-D3G4q9j

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 x402-apostle-chain-rwa-screen-real-world-asset-readiness-screener-50488aae -d '<json body>'
```

Example prompt: Can you screen the Texas energy market for real-world asset tokenization readiness and give me the readiness score and grid info?

## When to prefer this

Use this endpoint when you need a structured, scored readiness assessment for real-world asset tokenization in a specific US energy market and want a curated static reference with a clear readiness label. Prefer this over generic financial data APIs when the question is specifically about RWA tokenization readiness on known US energy grids (ERCOT, etc.) via pay-per-call x402 infrastructure.

## Known failure modes

- Invalid or unsupported market value — only 'texas', 'florida', 'newyork', 'oregon' are accepted enum values
- Payment failure or insufficient USDC balance — returns HTTP 402 with payment required details
- Network or upstream timeout — endpoint may be temporarily unavailable
- Missing 'params' or 'market' field in request body — likely returns a 400 or error JSON

## How this service works

Pay-per-call endpoints over x402 v2 and MPP (the "Payment" HTTP auth scheme, method usdc). Includes counterparty compliance checks: /report/counterparty (company + registered parents + UN/OFAC/EU/UK sanctions, signed and verifiable), /screen/name and /screen/entity. Free: /health, /.well-known/x402, /receipts, /prove/keys, /prove/stats.

## Output

Returns a JSON object with: a boolean 'ok' status, the energy grid identifier (e.g. 'ERCOT'), the endpoint type ('rwa-screen'), a numeric readiness score (0–1), the queried market name, a readiness label (e.g. 'ready'), a data source disclaimer, and a payment receipt containing the transaction hash, USD amount charged, and receipt ID.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "market": {
     "enum": [
      "texas",
      "florida",
      "newyork",
      "oregon"
     ],
     "type": "string"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "grid": "ERCOT",
  "type": "rwa-screen",
  "score": 0.87,
  "market": "texas",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.25,
   "receipt_id": "g402-<16hex>"
  },
  "readiness": "ready",
  "data_source": "curated static table; not advice"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-apostle-chain-rwa-screen-real-world-asset-readiness-screener-50488aae/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)