# Cardano x402 Offer Vetting and Adoption Decision Procedure

> Cardano x402 Offer Vetting and Adoption Decision Procedure 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 2026-10-16).

Generates a decision procedure brief helping agents evaluate x402 payment offers claiming Cardano/ADA support, distinguishing real settlement capability from marketing claims.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/cardano-x402-offer-vetting-and-adoption-decision?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cardano-x402-offer-vetting-and-adoption-decision-procedure-289d0ac9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Etq0Dt8lFpWpFN41LpdGn

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 cardano-x402-offer-vetting-and-adoption-decision-procedure-289d0ac9
```

Example prompt: I just received an x402 payment offer that claims Cardano Foundation support and ADA settlement — can you run the vetting procedure to tell me whether this is a real Cardano integration or just membership marketing, and give me adoption thresholds I should apply?

## When to prefer this

Use this endpoint when an agent needs structured, authoritative guidance on whether a specific x402 offer's Cardano claims are credible before committing to that payment rail. Prefer it over generic blockchain research when you need a decision-procedure format with explicit adoption thresholds and failure mode catalogues specific to the x402/Cardano intersection.

## Known failure modes

- Payment not settled — endpoint returns 402 if payment header is missing or malformed
- Handler failure — ok:false in result if the decision procedure could not be generated
- Invalid topic override — unrecognized topic parameter may produce generic or empty output
- Service unavailable — upstream LLM or reasoning engine unreachable returns error state

## How this service works

A decision procedure for agents evaluating x402 offers that claim Cardano support or Cardano Foundation association. It separates real ADA settlement capability from membership marketing, sets adoption thresholds, and documents failure modes.

## Output

Returns a prose decision procedure brief tailored to Cardano x402 offer evaluation, including criteria for distinguishing real ADA settlement capability from membership/marketing claims, adoption thresholds an agent should apply, and documented failure modes. Also includes metadata such as generation source (llm, reasoning, or deterministic), model used, topic, and ISO-8601 timestamp.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "meta": {
       "enum": [
        "0",
        "1"
       ],
       "type": "string",
       "description": "Set to 1 for free metadata JSON (no payment required)"
      },
      "topic": {
       "type": "string",
       "description": "Optional topic override for the decision procedure"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "title": "Cardano x402 offer vetting and adoption decision procedure paid response",
     "$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": "str
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cardano-x402-offer-vetting-and-adoption-decision-procedure-289d0ac9/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)