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If you already verify users with an identity verification (IDV) provider like Sumsub or Persona, you can send that data to Crossmint before creating an onramp order. When the data is complete, users can skip in-checkout identity verification. If you prefer to have individual users provide their KYC data client-side, Crossmint supports that as well. See the React Quickstart for that approach.

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How It Works

  1. Verify the user with your IDV provider
  2. Register the user’s KYC data with Crossmint
  3. Create an onramp order using the same email
  4. Crossmint runs sanctions, Politically Exposed Persons (PEP), and compliance checks
  5. The user completes payment

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Create an Onramp Order

Once the user is registered with their KYC data, you can create an onramp order. The order will use the registered KYC data for compliance checks.
Important: Crossmint links pre-registered KYC data to an order using the user’s email address. The payment.receiptEmail value must match the email used when registering the user’s KYC data with the Create User API.
const options = {
    method: 'POST',
    headers: {
        'X-API-KEY': 'YOUR_API_KEY',
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({
        recipient: {
            walletAddress: "YOUR_WALLET_ADDRESS"
        },
        payment: {
            method: "card",
            receiptEmail: "YOUR_USER_EMAIL"
        },
        lineItems: [
            {
                tokenLocator: "base-sepolia:0x036CbD53842c5426634e7929541eC2318f3dCF7e",
                executionParameters: {
                    mode: "exact-in",
                    amount: "1"
                }
            }
        ]
    })
};

fetch('https://staging.crossmint.com/api/2022-06-09/orders', options)
    .then(response => response.json())
    .then(response => console.log(response))
    .catch(err => console.error(err));
The lineItems field accepts either a single object or an array. The examples above use an array for consistency, but you can also pass a single line item object directly.

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Linking KYC Data to Orders

When you create an order, Crossmint automatically looks up the user’s KYC data based on the email address provided in payment.receiptEmail. Here is the complete flow:
1

Register user with KYC data

First, register the user’s KYC information using the Create User API. Make sure to include the user’s email in the email field within kycData:
const userLocator = "userId:YOUR_USER_ID";

const options = {
    method: 'PUT',
    headers: {
        'X-API-KEY': 'YOUR_API_KEY',
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({
        userDetails: {
            firstName: "John",
            lastName: "Doe",
            dateOfBirth: "1995-01-01",
            countryOfResidence: "DE"
        },
        kycData: {
            nationality: "DE",
            addressOfResidence: {
                line1: "123 Hauptstrasse",
                line2: "Apt 5",
                city: "Berlin",
                stateOrRegion: "Berlin",
                postalCode: "10115"
            },
            email: "YOUR_USER_EMAIL",
            identityDocument: {
                type: "passport",
                number: "AS12321",
                issuingCountryCode: "DE"
            }
        }
    })
};

fetch(`https://staging.crossmint.com/api/2025-06-09/users/${userLocator}`, options)
    .then(response => response.json())
    .then(response => console.log(response))
    .catch(err => console.error(err));
2

Create order with matching email

When creating the onramp order, use the same email address in payment.receiptEmail:
const options = {
    method: 'POST',
    headers: {
        'X-API-KEY': 'YOUR_API_KEY',
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({
        recipient: {
            walletAddress: "YOUR_WALLET_ADDRESS"
        },
        payment: {
            method: "card",
            receiptEmail: "YOUR_USER_EMAIL"
        },
        lineItems: [
            {
                tokenLocator: "base-sepolia:0x036CbD53842c5426634e7929541eC2318f3dCF7e",
                executionParameters: {
                    mode: "exact-in",
                    amount: "1"
                }
            }
        ]
    })
};

fetch('https://staging.crossmint.com/api/2022-06-09/orders', options)
    .then(response => response.json())
    .then(response => console.log(response))
    .catch(err => console.error(err));

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Order Responses

When all required KYC data has been provided and validated, the order moves to the payment phase:
{
  "clientSecret": "...",
  "order": {
    "orderId": "987e81ab-8c8f-464e-95e9-11ceda80d559",
    "phase": "payment",
    "locale": "en-US",
    "lineItems": [...],
    "quote": {...},
    "payment": {
      "method": "card",
      "currency": "usd",
      "status": "awaiting-payment"
    }
  }
}
When full KYC data is present but Crossmint needs to run additional compliance checks, the order enters a processing state. This typically resolves within a few seconds as Crossmint runs the appropriate checks:
{
  "clientSecret": "...",
  "order": {
    "orderId": "987e81ab-8c8f-464e-95e9-11ceda80d559",
    "phase": "payment",
    "locale": "en-US",
    "lineItems": [...],
    "quote": {...},
    "payment": {
      "method": "card",
      "currency": "usd",
      "status": "pending-kyc-review"
    }
  }
}
If no user personal data is provided, or if the data is insufficient, the order will fail:
{
  "error": true,
  "message": "Required full KYC user data is missing to complete the order"
}

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Guides

Registering a User

Data Requirements