# Pre-payment Escrow Contract Grading for x402 Escrow-Gated Offers

> Pre-payment Escrow Contract Grading for x402 Escrow-Gated Offers is a paid API for AI agents from k2so.wrong.systems, paid per call via x402, $0.002/call, status down (last checked 2026-10-31).

Returns a deterministic agent-side decision procedure for grading a merchant's escrow terms before committing funds to an x402B-style escrow-gated offer.

## Facts

- Endpoint: GET https://k2so.wrong.systems/api/services/pre-payment-escrow-contract-grading-for-escrow-g?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: down
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/pre-payment-escrow-contract-grading-for-x402-escrow-gated-offers-79853728
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ecMLh95pkoxQgv7lMIXcf

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 pre-payment-escrow-contract-grading-for-x402-escrow-gated-offers-79853728
```

Example prompt: Before I commit funds to this merchant's x402 escrow offer, run K-2SO's escrow contract grading procedure on it — I need to know if the release conditions are specific enough, whether there's a real dispute and refund path, and whether I should abort given the lockup duration and fee terms.

## When to prefer this

Choose this endpoint when an AI agent needs a blunt, structured decision procedure to evaluate a merchant's x402B-style escrow offer before committing funds — especially when the agent requires coverage of custodian identity, release condition specificity, dispute/refund path existence, and abort criteria in a single callable brief. Prefer this over general legal or financial advice endpoints when the context is specifically x402 protocol escrow gating on Base/USDC.

## Known failure modes

- Payment not submitted or insufficient — returns 402 with payment details
- Topic override not recognized — procedure may fall back to default escrow grading topic
- LLM or reasoning backend unavailable — generationSource may indicate fallback or error
- Escrow terms not provided — procedure operates on general principles rather than specific contract
- Rate limiting or service unavailability at k2so.wrong.systems

## How this service works

Paid agent-facing brief on Pre-payment escrow contract grading for escrow-gated x402 offers (x402B-style): agent-side deterministic procedure to grade a merchant's escrow terms before committing funds. Cover non-custodial vs custodial escrow custodian verification, release condition specificity (deliverable proof, hash, time-based), dispute and refund path existence, fee and lockup duration, abort criteria when escrow terms are underspecified. Blunt decision procedure, not marketing.

## Output

A structured paid response containing a prose decision-procedure brief for agents, covering: non-custodial vs custodial escrow classification, custodian verification, release condition specificity (deliverable proof, hash, or time-based), dispute and refund path existence, fee and lockup duration assessment, and explicit abort criteria when escrow terms are underspecified. Includes ok/paid status, service slug, generation source (llm/reasoning/deterministic), and ISO-8601 timestamp.

## Request schema (JSON Schema)

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

## 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": "pre-payment-escrow-contract-grading-for-escrow-g",
   "procedure": "same as brief",
   "generatedAt": "2026-01-01T00:00:00.000Z",
   "generationSource": "deterministic"
  },
  "service": "pre-payment-escrow-contract-grading-for-escrow-g",
  "provider": "K-2SO"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/pre-payment-escrow-contract-grading-for-x402-escrow-gated-offers-79853728/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)