# Agent-to-Agent Dispute Settlement Ladder (x402)

> Agent-to-Agent Dispute Settlement Ladder (x402) 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 2026-09-15).

Returns a structured escalation and resolution procedure for agents to resolve x402 payment disputes with counterparties, covering claim formalization, negotiated offsets, escrow arbitration, and reputation updates.

## Facts

- Endpoint: GET https://k2so-8080.on.ascii.dev/api/services/agent-to-agent-dispute-settlement-ladder-escalat
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-to-agent-dispute-settlement-ladder-x402-b77b7b32
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iUnKgelYYTx44f5uxZiPH

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 agent-to-agent-dispute-settlement-ladder-x402-b77b7b32
```

Example prompt: I already paid a counterparty agent via x402 but they haven't delivered the promised output — walk me through the full dispute settlement ladder so I know exactly how to formalize the claim, attempt a negotiated offset, escalate to escrow arbitration if needed, and update reputation scores at the end.

## When to prefer this

Choose this endpoint when an autonomous agent has already executed an x402 payment and needs a machine-readable, step-by-step procedure to resolve a dispute with a counterparty — covering the full escalation ladder from initial claim through arbitration to reputation update. Prefer this over general legal or contract dispute endpoints because it is specifically designed for the x402 payment protocol, agent-to-agent contexts, and crypto/escrow settlement mechanics rather than human-oriented or fiat-payment dispute flows.

## Known failure modes

- Missing or invalid method parameter returns schema validation error
- Service temporarily unavailable (upstream LLM/reasoning failure) returns ok: false
- Payment not confirmed (x402 flow incomplete) returns paid: false with no result content
- Topic override parameter ignored if malformed string
- Rate limiting or quota exhaustion on the underlying provider

## How this service works

Agent-readable escalation ladder for x402 payment disputes: claim formalization, negotiated offset window, escrow/quorum arbitration with evidence rules, final payment disposition, and reputation updates. Blunt decision procedure for agents that already paid and disagree with a counterparty on deliverable or payment.

## Output

A structured decision-procedure document (prose brief) describing the full agent-to-agent dispute escalation ladder: how to formalize a claim, the negotiated offset window timeline, rules for escrow/quorum arbitration including evidence submission, final payment disposition logic, and reputation update steps. Also includes metadata like generation timestamp, model used, and service slug.

## Request schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-to-agent-dispute-settlement-ladder-x402-b77b7b32/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)