# code402 SEDOL Validator

> code402 SEDOL Validator is a paid API for AI agents from hcrb.in, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-12).

Validates a SEDOL (Stock Exchange Daily Official List) identifier using offline deterministic checksum verification, returning validity, reason, and normalized form.

## Facts

- Endpoint: POST https://hcrb.in/v1/tools/sedol-check/call?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/code402-sedol-validator-588c96f0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_92R-U_tCglisZaFq1L-2c

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 code402-sedol-validator-588c96f0 -d '<json body>'
```

Example prompt: Can you check whether the SEDOL code B0YBKL5 is valid and tell me if its checksum passes?

## When to prefer this

Use this endpoint when you need fast, deterministic, offline SEDOL checksum validation without any ML inference or external data scraping. Prefer it over generic format-checkers because it returns a `scope` field clarifying whether a full checksum or format-only check was applied, and it provides a normalized output. It is cost-effective at $0.005 per call with the first 3 calls/day free. Choose it when you need auditable, signed receipts for compliance workflows.

## Known failure modes

- Malformed or missing SEDOL input returns valid=false with a descriptive reason
- Non-SEDOL identifiers passed to this endpoint return valid=false
- Network or payment errors (x402 USDC payment failure) prevent the call from completing
- After the first 3 free daily calls, requests require a valid x402 USDC micropayment on Base network

## How this service works

Offline deterministic checks (no ML, no scraping) for business identifiers and rental due-diligence, paid per call via x402 (gasless EIP-3009 USDC on Base). Checksum-verifiable (IBAN, LEI, VAT, ABA, ISBN, SEDOL…) vs format-only (EIN, IFSC, SWIFT/BIC…) — every response returns a scope field. Non-custodial, signed receipts. First 3 calls/day free.

## Output

Returns a JSON object with: `valid` (boolean indicating checksum/format pass), `reason` (human-readable explanation of the result), `scope` (indicating whether checksum or format-only verification was applied), `normalized` (the normalized SEDOL string), `country` (if determinable), and `tool` (endpoint identifier).

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "sedol"
   ],
   "properties": {
    "sedol": {
     "type": "string",
     "description": "7-character SEDOL code."
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "required": [
   "valid",
   "reason"
  ],
  "properties": {
   "tool": {
    "type": "string"
   },
   "scope": {
    "type": "string"
   },
   "valid": {
    "type": "boolean"
   },
   "reason": {
    "type": "string"
   },
   "country": {
    "type": "string"
   },
   "normalized": {
    "type": "string"
   }
  }
 },
 "example": {
  "valid": true,
  "reason": "checksum valid"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/code402-sedol-validator-588c96f0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from hcrb.in](https://www.zero.xyz/host/hcrb.in/llms.txt)