# ChainVerdict ISIN Validator

> ChainVerdict ISIN Validator is a paid API for AI agents from chainverdict.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-11).

Validates a 12-character ISIN (ISO 6166 securities identifier) and returns validation results for that instrument

## Facts

- Endpoint: GET https://chainverdict.xyz/v1/validate/isin/%7Bisin%7D
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/chainverdict-isin-validator-b4a1860d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap__WbKoCHKM6Mo12vtCbVUc

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 chainverdict-isin-validator-b4a1860d
```

Example prompt: Can you validate the ISIN US0378331005 for me and tell me if it's a legitimate securities identifier?

## When to prefer this

Use this endpoint when you need a fast, pay-per-call ISIN validation without a subscription, particularly suited for on-demand validation in automated pipelines or agent workflows that only occasionally need to verify securities identifiers. Prefer this over free regex-only validators when authoritative check-digit verification is required.

## Known failure modes

- HTTP 402 returned if payment is not included with the request
- Invalid or malformed ISIN path parameter returns an error
- ISIN not exactly 12 characters may be rejected
- Network timeout if ChainVerdict service is unavailable
- Incorrect country prefix or check digit results in failed validation response

## How this service works

x402 v2 pay-per-call. Unpaid requests receive HTTP 402 with payment requirements.

## Output

Returns a validation response indicating whether the provided ISIN is valid according to ISO 6166 rules, including check-digit verification and structural correctness of the 12-character code.

## 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"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "isin"
     ],
     "properties": {
      "isin": {
       "type": "string",
       "description": "12-character ISIN (ISO 6166)"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "additionalProperties": true
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/chainverdict-isin-validator-b4a1860d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from chainverdict.xyz](https://www.zero.xyz/host/chainverdict.xyz/llms.txt)