# x402 Payment Security and Provenance Decision Procedure

> x402 Payment Security and Provenance 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 2026-10-20).

Returns an AI-generated decision procedure guiding agents on how to secure API credentials and prove payment provenance when monetizing APIs over the x402 protocol.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/agent-facing-x402-payment-security-and-provenanc?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/x402-payment-security-and-provenance-decision-procedure-ca32538d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_adL4VcE483MooYEMdYF7g

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-payment-security-and-provenance-decision-procedure-ca32538d
```

Example prompt: Can you walk me through the full security and provenance procedure for monetizing an API over x402 — specifically how to manage ECIES keys, encrypt credentials at rest, decrypt only at serve time, trigger key rotation on a suspected leak, and record each paid call as a Solana memo with creator fee routing?

## When to prefer this

Choose this endpoint when your agent needs authoritative, ready-to-execute guidance specifically on securing API credentials and proving payment provenance in an x402 monetization context — particularly when ECIES key lifecycle management, Solana memo-based audit trails, or creator fee routing are the focus. Prefer this over generic security guides when your stack is x402 + Solana and you need a decision procedure rather than raw documentation.

## Known failure modes

- Payment not provided — returns 402 with payment instructions rather than the procedure
- Invalid query parameter values (e.g. bad 'meta' enum) — may return 400 or unexpected behavior
- LLM generation failure — 'ok' field may be false with no 'brief' or 'procedure' in result
- Service temporarily unavailable on ascii.dev infrastructure — 5xx error
- Topic override not recognized — falls back to default x402 security and provenance topic

## How this service works

Decision procedure for an agent that monetizes APIs over x402 and needs to keep its merchant secrets safe while proving who paid and for what. Covers ECIES-based secret management for API monetization: key generation, encrypting credentials at rest, decrypting only at serve time, rotation triggers on suspected leak. Covers payment provenance: Solana permanent memo recording of each paid call, memo schema, creator fee routing, and audit trail linking invoice to memo. Covers full-stack asset

## Output

A structured JSON response containing a prose decision procedure ('brief' and 'procedure' fields) covering ECIES-based secret management steps, Solana memo schema for payment provenance, creator fee routing, and audit trail construction — along with metadata like the generating model, ISO-8601 timestamp, and generation source (llm/reasoning/deterministic).

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-payment-security-and-provenance-decision-procedure-ca32538d/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)