# ylk-robinhood-brief

> ylk-robinhood-brief is a paid API for AI agents from ylk.one, paid per call via x402, $0.08/call, status down (last checked 2026-10-24).

Returns a composite brief combining Robinhood Chain (4663) x402 catalog lag metrics and per-address fingerprint/trust analysis in a single paid call.

## Facts

- Endpoint: GET https://ylk.one/v1/robinhood/brief?utm_source=zero.xyz
- Price: $0.08/call
- Payment: x402
- Status: down
- Last checked: 2026-10-24
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ylk-robinhood-brief-31ebeb8e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_9POf8Hqflb7hPKLI_KOjm

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 ylk-robinhood-brief-31ebeb8e
```

Example prompt: Pull the full Robinhood Chain x402 brief for wallet address 0xAbc123...def — I want to see both the chain-wide catalog lag and the trust fingerprint for that address in one shot.

## When to prefer this

Use this endpoint when you need both Robinhood Chain (4663) catalog lag intelligence AND a specific wallet's x402 fingerprint in one call, saving a round-trip vs calling ylk-robinhood-lag and hood-fingerprint separately. Prefer over ylk-brief when the focus is specifically on the Robinhood Chain (4663) rather than general x402 rails. Prefer over ylk-robinhood-lag alone when per-address trust verdict is also needed.

## Known failure modes

- Missing or invalid wallet address parameter 'a' — returns error requiring 0x-prefixed Base address
- Payment not completed — x402 payment wall blocks response until $0.08 USDC settled
- Invalid address format — non-0x or non-Base address rejected
- Robinhood Chain data temporarily unavailable — upstream RPC or CDP lag
- Rate limit or payment replay rejection

## How this service works

Composite Robinhood x402 brief: chain-wide catalog lag + per-address fingerprint in one call. Paid upgrade after ylk-robinhood-lag — replaces standalone hood-fingerprint on the Bazaar shelf.

## Output

A composite JSON brief containing: Robinhood Chain (4663) catalog lag data (CDP rows vs on-chain payTos, off-catalog x402-ready earners) combined with a per-address fingerprint/trust analysis (verdict such as organic/concentrated/fragile/solo/opaque, settlement activity) — all in a single response.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "a": {
       "type": "string",
       "description": "0x… x402 payTo / service wallet on Base (required at call time)"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ylk-robinhood-brief-31ebeb8e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ylk.one](https://www.zero.xyz/host/ylk.one/llms.txt)