# Fingerprint

_Use Evervault's Fingerprint API retrieve metadata for encrypted values._

Use the [Fingerprint API](/api#fingerprint) to retrieve metadata about any encrypted value. For example, if you pass an encrypted card, you can retrieve the card brand, the last four digits, etc.

```javascript
const response = await fetch("https://api.evervault.com/fingerprint", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    Authorization: "Basic " + btoa("<app_id>:<api_key>"),
  },
  body: JSON.stringify({
    token:
      "ev:debug:Tk9D:HBpzdbFWXbX/N2cC:AyjMY/SKO49SlkXcDPtCGs+DxnUn/F8/lAtajCYZ/xT7:KV7AUn9vJJkZDtL8PKdOc8Y11yTL2vZQasFuHqM=:$",
  }),
});
```

The API responds with an object containing details about the encrypted data, as well as the card metadata inside of the `metadata` field.

```json
{
  "type": "string",
  "category": "card-number",
  "encryptedAt": 1700067122000,
  "role": null,
  "fingerprint": "u0ljSwrqhhUv7GykyCHB/A2bgVGXq06fnG9bOI27Sbg/tAOz3myr5zsfbasEWuMLiH6jZayu3AHGfiB7l+Bbjg",
  "metadata": {
    "bin": "424242",
    "lastFour": "4242",
    "brand": "visa",
    "funding": "debit",
    "segment": "consumer",
    "country": "gb",
    "currency": "gbp",
    "issuer": "Gringotts Wizarding Bank and Trust Company"
  }
}
```

## BIN Lookup vs. Fingerprint

| Metadata | Description | Fingerprint | BIN Lookup |
| --- | --- | --- | --- |
| Fingerprint | A unique identifier for the encrypted card. This can be used to detect card reuse. | ✓ | ✗ |
| BIN | The first 6 or 8 digits of the card number. | ✓ | ✗ |
| Last 4 | The last 4 digits of the card number. | ✓ | ✗ |
| Brand | The card brand, such as Visa or Mastercard. | ✓ | ✓ |
| Funding | The card funding type specifies the method by which transactions are financed (e.g. debit, credit). | ✓ | ✓ |
| Segment | The card segment indicates the primary market or usage category of the card (e.g. consumer, etc.). | ✓ | ✓ |
| Country | The country where the card was issued. | ✓ | ✓ |
| Currency | The currency of the card. | ✓ | ✓ |
| Issuer | The name of the card issuer. | ✓ | ✓ |
| Product Name | The name of the card product. | ✗ | ✓ |
| Fast Funds | Indicates whether the card supports fast funds (e.g. domestic, cross-border). | ✗ | ✓ |
| Match Precision | Indicates how many leading digits of the submitted BIN are confirmed by the matched data. A higher value means a more specific match. When multiple matches are found, the value represents the least precise BIN range the submitted BIN could belong to. | ✗ | ✓ |
| Three DS | Details on supported 3D Secure versions and ACS indicators for the card range. | ✗ | ✓ |

See [BIN Lookup](/cards/insights-and-verification#bin-lookup) for retrieving metadata for a BIN range instead of a single encrypted card.

- [Relay](/relay): Learn how to use Relay to encrypt or decrypt data in transit, without changing your application code.
- [Functions](/functions): Learn how to use Functions to process encrypted data with your own code.