# Wallet Signature Authorization Scope Grading

> Wallet Signature Authorization Scope Grading is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-20).

Classifies an incoming wallet signature into one of three authorization scopes (payment-capability, delegated intent, or policy-conforming authority) and returns a verdict on whether to accept it as full authorization.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/wallet-signature-authorization-scope-grading?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/wallet-signature-authorization-scope-grading-f5e7edba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-LdGTbgAm7gsU5wx-51aQ

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 wallet-signature-authorization-scope-grading-f5e7edba
```

Example prompt: Before treating this incoming wallet signature as full authorization to proceed, can you grade its scope — tell me whether it only proves payment capability, whether it binds the principal and agent ID as delegated intent, or whether it's fully policy-conforming authority with a quote hash or delegation record?

## When to prefer this

Choose this endpoint when an autonomous agent needs to validate whether a wallet signature it received actually constitutes authorization — not just payment capability. Especially valuable in multi-agent pipelines where principals delegate authority to sub-agents and the scope of that delegation matters before executing consequential actions. Prefer this over generic signature verification when you need a three-tier scope verdict that distinguishes payment proof from intent binding from policy-conforming authority.

## Known failure modes

- Missing or malformed input signature payload returns an error verdict
- Signature that cannot be parsed or verified may be classified as payment-capability only by default
- Network or upstream LLM failure may result in a failed generation with ok=false
- Ambiguous payloads without clear binding fields may receive a lower scope classification than expected
- Payment not confirmed results in 402 response requiring x402 payment before result is returned

## How this service works

Procedure that grades what a wallet signature actually proves before an agent treats it as authorization. Classifies an incoming signature as one of three scopes: (1) payment-capability only, the signature proves the wallet moved value but nothing about intent; (2) delegated intent, the signed payload binds principal, agent ID, and purpose; (3) policy-conforming authority, the payload also references the governing policy, quote hash, or delegation record. Returns a verdict: accept as full

## Output

A structured verdict classifying the wallet signature as one of three scopes: (1) payment-capability only, (2) delegated intent, or (3) policy-conforming authority. Includes an 'ok' boolean, a human-readable decision procedure brief for agents, the service slug, topic, generation source (llm/reasoning/deterministic), and an ISO-8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Wallet Signature Authorization Scope Grading paid response",
     "$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": "string"
        }
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/wallet-signature-authorization-scope-grading-f5e7edba/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from k2so-8080.on.ascii.dev](https://www.zero.xyz/host/k2so-8080.on.ascii.dev/llms.txt)