Mint

Builds a Metaplex Core mint, paid for and signed by authority. asset is the address the new asset will occupy.

The kind discriminator selects what is minted:

core_asset — a 1/1, optionally placed into collection.
core_master_edition_collection — a printable master edition. Omit maxSupply for an open edition; set it to cap the print run.
core_collection — a parent collection that other assets can join.

The first Core group operation by a verified creator may be fully rent-subsidised by mallow, in which case the returned transaction already carries mallow's co-signature and the creator pays nothing — sign and broadcast it unchanged rather than rebuilding it.

Authorization

ApiKeyAuth

x-api-key<token>

In: header

Request Body

application/json

TypeScript Definitions

Use the request body type in TypeScript.

kind*"core_asset"

Mint a 1/1 asset.

Value in

"core_asset"

collection?

Reference to the collection an asset belongs to. tokenStandard tells the builder which program owns the collection account.

authority*string

Wallet minting the asset (base58). Signs and pays for the transaction.

asset*string

Address the new asset will occupy (base58). Generate a fresh keypair for it — the transaction is built for this exact address and must also be signed by it.

uri*string

URI of the off-chain JSON metadata, written to the on-chain metadata account.

nftMetadata*

Metadata for a mint or edit. name, sellerFeeBasisPoints and creators are written on-chain; everything under extendedMetadata is stored off-chain by mallow.

targetPriorityFeeLamports?integer

Total priority fee to target for this transaction, in lamports. The builder derives the compute-unit price from it and the transaction's compute budget. Omit to let mallow pick a fee from current network conditions.

Formatuint64

blockhash?string

Recent blockhash to stamp onto the transaction, base58. Omit to let mallow supply one — mallow's is cached for up to 10 seconds, so two identical requests inside that window compile the same transaction, with the same signature once signed. Supply your own to control the expiry window, or when otherwise-identical requests must produce distinct transactions. Rejected with a 400 if it is not valid base58; a blockhash the cluster has already aged out builds fine and fails at send time.

Response Body

`application/json`

curl -X POST "https://example.com/v2/tx/nft/mint" \  -H "Content-Type: application/json" \  -d '{    "authority": "string",    "asset": "string",    "uri": "string",    "nftMetadata": {      "name": "string",      "sellerFeeBasisPoints": 0    },    "kind": "core_asset"  }'

{  "result": {    "tx": "string"  }}

Authorization

Request Body

Response Body

200application/json

400application/json

401application/json

429application/json

500application/json

`application/json`

`application/json`

`application/json`

`application/json`

`application/json`