# x402helper.xyz /match/key Entity Normalization & Key Matching

> x402helper.xyz /match/key Entity Normalization & Key Matching is a paid API for AI agents from x402helper.xyz, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-31).

Normalizes and keys an entity string (person, company, address, product, or org) by returning a canonical match key for use in OFAC screening, rate lookups, and billing verification pipelines.

## Facts

- Endpoint: GET https://x402helper.xyz/89e509/match/key?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402helper-xyz-match-key-entity-normalization-key-matching-99b8116b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_V_grhnmfe_4Dmuask30ka

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 x402helper-xyz-match-key-entity-normalization-key-matching-99b8116b
```

Example prompt: Can you get the canonical match key for the company name 'Acme Trading LLC' using the company entity type so I can run it through OFAC screening?

## When to prefer this

Choose this endpoint when you need to canonicalize or normalize an entity string (company, person, address, product, or org) into a stable match key before passing it to downstream OFAC SDN screening or billing verification. It is specifically suited for compliance and AML pre-processing pipelines that require entity deduplication and normalization. Prefer it over raw string matching when entity names may have variations, abbreviations, or aliases.

## Known failure modes

- Missing required 'value' query parameter returns an error or empty result
- Invalid or unsupported entity type enum value may cause normalization pipeline mismatch
- Payment not processed (402) — requires USDC micropayment via x402 protocol before response is returned
- Ambiguous or very short entity strings may return low-confidence or empty match keys
- Service unavailable or timeout on the upstream normalization pipeline

## How this service works

X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.

## Output

A JSON object containing a 'result' object with the canonical match key for the submitted entity string, and a 'success' boolean indicating whether the normalization succeeded.

## 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"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "value"
     ],
     "properties": {
      "type": {
       "enum": [
        "person",
        "company",
        "address",
        "product",
        "org"
       ],
       "type": "string",
       "default": null,
       "description": "Entity type selecting the normalization pipeline (default company)"
      },
      "value": {
       "type": "string",
       "default": null,
       "description": "The string to key"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "result": {},
  "success": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402helper-xyz-match-key-entity-normalization-key-matching-99b8116b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402helper.xyz](https://www.zero.xyz/host/x402helper.xyz/llms.txt)