# CoinOpSelect Escrow Transition Validator

> CoinOpSelect Escrow Transition Validator is a paid API for AI agents from coinop.publicvm.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Checks whether a given escrow status transition (from one state to another) is allowed within the CoinOpSelect on-chain escrow workflow.

## Facts

- Endpoint: GET https://coinop.publicvm.com/api/v1/escrow/transition?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/coinopselect-escrow-transition-validator-d3c3b789
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ixV23Uob6bJHxyE9iPTav

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 coinopselect-escrow-transition-validator-d3c3b789
```

Example prompt: Can you check whether an escrow is allowed to transition from 'pending' to 'active' status on CoinOpSelect — I want to know if that state change is valid before I proceed.

## When to prefer this

Use this endpoint when you need to programmatically validate whether a specific escrow state transition is permitted before attempting it on-chain, particularly within the CoinOpSelect escrow workflow on Base. Prefer this over guessing valid transitions from documentation when building escrow automation agents.

## Known failure modes

- Missing required 'from' or 'to' query parameters returns an error
- Invalid or unrecognized status values may return allowed: false or an error
- Payment via x402 not completed results in HTTP 402 response blocking the call
- Incorrect 'type' or 'method' fields may cause unexpected validation results

## How this service works

Paid on-chain token, wallet, contract and research data over x402 on Base.

## Output

Returns a JSON object with a 'query' string (e.g. 'escrow-transition') and an 'allowed' boolean indicating whether the requested escrow status transition is permitted.

## Request schema (JSON Schema)

```json
{
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "method": {
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "from",
      "to"
     ],
     "properties": {
      "to": {
       "type": "string",
       "description": "To status"
      },
      "from": {
       "type": "string",
       "description": "From status"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "properties": {
    "query": {
     "type": "string"
    },
    "allowed": {
     "type": "boolean"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "query": "escrow-transition",
  "allowed": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/coinopselect-escrow-transition-validator-d3c3b789/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from coinop.publicvm.com](https://www.zero.xyz/host/coinop.publicvm.com/llms.txt)