# RWA Data Feed Endpoint Selection + x402 Scoped Session-Key Authorization Decision Procedure

> RWA Data Feed Endpoint Selection + x402 Scoped Session-Key Authorization Decision Procedure is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-21).

Returns a paid AI-generated decision procedure for selecting RWA data feed endpoints and implementing scoped session-key authorization for x402 payments

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/rwa-data-feed-endpoint-selection-for-agents-plus?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rwa-data-feed-endpoint-selection-x402-scoped-session-key-4a8d9a49
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_5JM8SMW8moooJm-CIVZMi

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 rwa-data-feed-endpoint-selection-x402-scoped-session-key-4a8d9a49
```

Example prompt: Give me a blunt decision procedure for selecting the right RWA data feed endpoint for my agent, and include the scoped session-key authorization standard for x402 payments — with inputs, thresholds, and failure modes.

## When to prefer this

Choose this endpoint when an agent or developer needs a structured, opinionated decision procedure — not generic documentation — for simultaneously solving RWA data feed endpoint selection and x402 scoped session-key authorization. Prefer it when free docs are insufficient or when you need a machine-readable brief with explicit thresholds and failure modes tailored for autonomous agent consumption at $0.002 per call.

## Known failure modes

- Payment not received — returns 402 with payment instructions before delivering content
- Handler failure — ok:false in result object if generation fails internally
- Invalid method — only GET/HEAD/DELETE accepted
- Free documentation already covers the topic — paid brief may not add value (per stated falsifier condition)
- LLM generation timeout or unavailability — generationSource may fall back or return error

## How this service works

Paid agent-facing decision procedure on scoped session-key authorization for x402 payments: when an agent is offered wallet access to pay APIs, whether to accept a scoped session key instead of broad wallet authorization. Covers scope fit, spend ceilings, expiry vs task horizon, rotation and revocation requirements, and refusal rules for merchants demanding broad access. Blunt procedure, not marketing.

## Output

A structured decision-procedure brief generated by an LLM or reasoning engine, covering: criteria and inputs for selecting RWA data feed endpoints, thresholds for acceptance or rejection, the scoped session-key authorization standard for x402 payments, and enumerated failure modes. Response includes the prose brief, the topic slug, generation source (llm/reasoning/deterministic), and ISO-8601 timestamp. Payment metadata included in response.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Scoped session-key authorization standard for x402 payments paid response",
     "$schema": "https://json-schema.org/draft/2020-12/schema",
     "required": [
      "ok",
      "paid",
      "service",
      "provider",
      "result"
     ],
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "paid": {
       "type": "boolean"
      },
      "result": {
       "type": "object",
       "required": [
        "ok",
        "service"
       ],
       "properties": {
        "ok": {
         "type": "boolean",
         "description": "Handler success"
        },
        "brief": {
         "type": "string",
         "description": "Decision procedure prose for agents"
        },
        "model": {
         "type": "string"
        },
        "topic": {
         "type": "string"
        },
        "service": {
         "type": "string",
         "description": "Service slug"
        },
        "procedure": {
         "type": "string"
        },
        "generatedAt": {
         "type": "string",
         "description": "ISO-8601 timestamp"
        },
        "generationSource": {
         "enum": [
          "llm",
          "reasoning",
          "deterministic"
         ],
         "type": "string"
        }
       }
      },
      "payment": {
       "type": "object",
       "properties": {
        "code": {
         "type": "string"
        },
        "payer": {
         "type": "string"
        },
        "detail": {
         "type": "st
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "paid": true,
  "result": {
   "ok": true,
   "brief": "plain prose decision procedure (120+ words)",
   "model": "deepseek/deepseek-v4-flash-0731",
   "topic": "string topic",
   "service": "rwa-data-feed-endpoint-selection-for-agents-plus",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "rwa-data-feed-endpoint-selection-for-agents-plus",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rwa-data-feed-endpoint-selection-x402-scoped-session-key-4a8d9a49/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so.wrong.systems](https://www.zero.xyz/host/k2so.wrong.systems/llms.txt)