Verifier

Enter serials to verify:

FAQ

What does this do?

This tool lets you look up the serial numbers on MetalMark bills and Certificates of Authenticity. We’ll see if those serials exist in our database of all serials ever issued and see if they’re legit.

Beyond just confirming we issued them, once we find a match we’ll show you when they were made, how many are a part of the lot, and other details like which edition it belongs to.

Where are the serials?

For bill serials, these are located on the back of the bill. Though the exact placement varies across designs, it should be labeled “SERIAL” and in a table or grid of other bill information.

For COAs, the serial is shorter and etched on the FIPS-compatible holographic security seal.

Do you need both serials to be genuine?

The bill serial is usually enough to ensure the bill you have is genuine. For an extra layer of peace of mind, you can also ensure the COA you have is genuine and belongs to the correct lot.

API

MetalMark provides a REST API for working with our bills. Requests can be made with any language or library.

URL	https://app.mtlmrk.com
Content type	application/json
Rate limit	~120 requests per minute

Verify

This is an unauthenticated endpoint for returning information on any serial found on a MetalMark bill or Certificate of Authenticity (COA).

Endpoints

GET /api/verify: Returns information on serials
POST /api/verify: Returns information on serials

`GET` Returns information on serials

Parameters

sstringrequired: The serial to look up. This is typically the bill serial, but can also be the COA serial.
Required unless bill and coa are explicitly passed.
billstring: The serial number found on a bill.
Only used when coa is also explicitly passed.
coastring: The serial found on the COA.
Only used when bill is also explicitly passed.

Response

idstring

The identifier for the combination of series and edition.

descriptionstring

Longer form description.

dataobject

Contains information about the serial, like what series it is for, who made the artwork, how many were made, and more.

artiststring: The name of the primary artist whose work is depicted.
artNamestring: The title of the depicted artwork.
billPrefixstring: The prefix used to generate bill serials.
coaPrefixstring: The prefixed used to generate COA serials.
codestring: The code or SKU family for the series.
dateMintedstring: Alias for mintDate, an ISO8601 datestamp representing the date of creation.
descriptionstring: Longer form description.
editionstring: The identifier for the edition.
lotSizenumber: Alias for units, the total number made for this series and edition.
mintstring: The name of the mint or manufacturer.
mintDatestring: An ISO8601 datestamp representing the date of creation.
motdstring: A "mode of the day," usually a quick summary of the series.
seriesstring: The series or collection where this belongs.
unitsnumber: The total number made for this series and edition.
yearArtMadestring: The year the featured artwork was finished.

authenticityGuaranteestring

Returns the degree to which we can validate the serials.

When validating one serial (either bill or COA), this will be partial if we can find a match. When validating both a bill and COA serial together, this will be full if we find a match for both and they're part of the same set.

HTTP/2 200 OK
{
	"id": "34",
	"description": "Artist Series - Frank Frazetta - 1000mg",
	"data": {
		"artist": "Frank Frazetta",
		"artName": "Dark Kingdom",
		"billPrefix": "MM",
		"coaPrefix": "",
		"code": "AS-FF-1K-AU",
		"dateMinted": "2024-05-15",
		"description": "Artist Series - Frank Frazetta - 1000mg",
		"edition": "First",
		"lotSize": 500,
		"mint": "MetalMark",
		"mintDate": "2024-05-15T15:34:49.124Z",
		"motd": "Dark Kingdom by Frank Frazetta, 1976",
		"series": "Artist Series",
		"units": 500,
		"yearArtMade": "1976",
	},
	"authenticityGuarantee": "partial",
}

`POST` Returns information on serials

Parameters

sstringrequired: The serial to look up. This is typically the bill serial, but can also be the COA serial.
Required unless bill and coa are explicitly passed.
billstring: The serial number found on a bill.
Only used when coa is also explicitly passed.
coastring: The serial found on the COA.
Only used when bill is also explicitly passed.

Response

idstring

The identifier for the combination of series and edition.

descriptionstring

Longer form description.

dataobject

Contains information about the serial, like what series it is for, who made the artwork, how many were made, and more.

artiststring: The name of the primary artist whose work is depicted.
artNamestring: The title of the depicted artwork.
billPrefixstring: The prefix used to generate bill serials.
coaPrefixstring: The prefixed used to generate COA serials.
codestring: The code or SKU family for the series.
dateMintedstring: Alias for mintDate, an ISO8601 datestamp representing the date of creation.
descriptionstring: Longer form description.
editionstring: The identifier for the edition.
lotSizenumber: Alias for units, the total number made for this series and edition.
mintstring: The name of the mint or manufacturer.
mintDatestring: An ISO8601 datestamp representing the date of creation.
motdstring: A "mode of the day," usually a quick summary of the series.
seriesstring: The series or collection where this belongs.
unitsnumber: The total number made for this series and edition.
yearArtMadestring: The year the featured artwork was finished.

authenticityGuaranteestring

Returns the degree to which we can validate the serials.

When validating one serial (either bill or COA), this will be partial if we can find a match. When validating both a bill and COA serial together, this will be full if we find a match for both and they're part of the same set.

HTTP/2 200 OK
{
	"id": "34",
	"description": "Artist Series - Frank Frazetta - 1000mg",
	"data": {
		"artist": "Frank Frazetta",
		"artName": "Dark Kingdom",
		"billPrefix": "MM",
		"coaPrefix": "",
		"code": "AS-FF-1K-AU",
		"dateMinted": "2024-05-15",
		"description": "Artist Series - Frank Frazetta - 1000mg",
		"edition": "First",
		"lotSize": 500,
		"mint": "MetalMark",
		"mintDate": "2024-05-15T15:34:49.124Z",
		"motd": "Dark Kingdom by Frank Frazetta, 1976",
		"series": "Artist Series",
		"units": 500,
		"yearArtMade": "1976",
	},
	"authenticityGuarantee": "partial",
}

Verifier

FAQ

API

Verify

Endpoints

GET Returns information on serials

Parameters

Response

POST Returns information on serials

Parameters

Response

Get early access & more.

`GET` Returns information on serials

`POST` Returns information on serials