crossmint

Capabilities

Crossmint provides comprehensive blockchain infrastructure that enables agents to create and manage wallets, process payments, mint tokens, and orchestrate stablecoin movements globally. The platform abstracts complex blockchain operations into simple API calls, supporting multiple chains including EVM (Ethereum, Polygon, Base), Solana, and Stellar networks.

Skills

Wallet Management

• Create Wallets: Generate custodial or non-custodial wallets with email, phone, passkey, or API key authentication
  • API: POST /api/2025-06-09/wallets
  • Supports EVM, Solana, and Stellar chains
• Check Balances: Retrieve wallet balances across multiple tokens and chains
  • API: GET /api/2025-06-09/wallets/{walletLocator}/balances
• Transfer Tokens: Send tokens between wallets with built-in compliance checks
  • API: POST /api/2025-06-09/wallets/{walletLocator}/tokens/{chain}:{token}/transfers
• Execute Transactions: Send arbitrary blockchain transactions
  • API: POST /api/2025-06-09/wallets/{walletLocator}/transactions
• Sign Messages: Sign messages and typed data for authentication
  • API: POST /api/2025-06-09/wallets/{walletLocator}/signatures

Payment Processing

• Create Checkout Orders: Accept payments via credit cards, Apple/Google Pay, stablecoins, or cross-chain crypto
  • API: POST /api/v1-alpha2/checkout/orders
  • Supports physical goods, NFTs, memecoins, and stablecoins
• Process Payments: Handle payment processing with automatic currency conversion
  • API: POST /api/v1-alpha2/checkout/orders/{orderId}/payments
• Check Token Support: Verify if specific tokens are supported for checkout
  • API: GET /api/v1-alpha2/tokens/{tokenLocator}
• Track Order Status: Monitor order lifecycle from quote to delivery
  • API: GET /api/v1-alpha2/checkout/orders/{orderId}

Tokenization & NFTs

• Create Collections: Deploy NFT collections on multiple chains
  • API: POST /api/v1-alpha1/minting/collections
• Mint NFTs: Create unique digital assets with metadata
  • API: POST /api/v1-alpha1/minting/nfts
• Mint SFTs: Create semi-fungible tokens for limited editions
  • API: POST /api/v1-alpha1/minting/nfts/sft
• Update NFTs: Modify NFT metadata and properties
  • API: PATCH /api/v1-alpha1/minting/nfts/{nftLocator}
• Burn NFTs: Permanently destroy tokens
  • API: DELETE /api/v1-alpha1/minting/nfts/{nftLocator}

Verifiable Credentials

• Issue Credentials: Create tamper-proof digital credentials as NFTs
  • API: POST /api/v1-alpha1/credentials
• Retrieve Credentials: Fetch credentials by ID or NFT locator
  • API: GET /api/v1-alpha1/credentials/{credentialId}
• Verify Credentials: Validate credential authenticity and integrity
  • API: POST /api/v1-alpha1/credentials/verify
• Revoke Credentials: Invalidate issued credentials
  • API: POST /api/v1-alpha1/credentials/{credentialId}/revoke

Stablecoin Orchestration

• Onramp Funds: Enable users to buy stablecoins with fiat
  • Embedded widget for user funding
• Treasury Wallets: Create programmable wallets for managing reserves
  • API: POST /api/2025-06-09/wallets with treasury configuration
• Regulated Transfers: Send compliant stablecoin transfers globally
  • Built-in AML, sanctions screening, and travel rule compliance
• User Compliance: Register users and manage KYC/AML requirements
  • API: PUT /api/2025-06-09/users/{userLocator}
  • API: PUT /api/2025-06-09/users/{userLocator}/identity-verification

AI Agent Commerce

• Delegate Payment Methods: Allow agents to use user payment credentials
• Purchase Physical Goods: Buy items from Amazon, Shopify, or any guest checkout
• Track Fulfillment: Monitor shipping and delivery status
• Inventory Access: Query over 1 billion items across e-commerce platforms

Intellectual Property (Story Protocol)

• Create IP Collections: Deploy collections for intellectual property assets
  • API: POST /api/v1/ip/collections
• Register IP Assets: Tokenize creative works (music, literature, images)
  • API: POST /api/v1/ip/assets
• Manage Licenses: Create and track IP licensing terms
  • API: GET /api/v1/ip/licenses/{ipassetId}

Workflows

Create and Fund a User Wallet

1. Create wallet with user identifier: POST /api/2025-06-09/wallets
2. Get wallet address from response
3. Fund wallet via onramp widget or direct transfer
4. Check balance: GET /api/2025-06-09/wallets/{address}/balances

Process a Checkout Payment

1. Create order with items and payment methods: POST /api/v1-alpha2/checkout/orders
2. Collect payment details from user
3. Process payment: POST /api/v1-alpha2/checkout/orders/{orderId}/payments
4. Monitor order status via webhooks or polling
5. Handle delivery completion

Issue Verifiable Credentials

1. Create credential type: POST /api/v1-alpha1/credentials/types
2. Create credential template with metadata schema
3. Issue credential to recipient: POST /api/v1-alpha1/credentials
4. Credential is minted as NFT on specified chain
5. Retrieve and verify credential as needed

Enable Agent Purchases

1. User delegates payment method to agent
2. Agent creates purchase order with delegated payment
3. Crossmint handles checkout, anti-fraud, and fulfillment
4. Agent tracks order status and delivery updates

Compliant Stablecoin Transfer

1. Register sender and recipient users with KYC data
2. Trigger identity verification for both parties
3. Create treasury wallet for holding funds
4. Execute transfer with compliance checks
5. Handle any compliance failures with specific error codes

Integration

Authentication

• API Keys: Server-side and client-side keys with configurable scopes
• JWT Authentication: For user-specific operations
• Webhook Signatures: Verify webhook authenticity with HMAC

SDKs and Tools

• TypeScript SDK: @crossmint/wallets-sdk, @crossmint/client-sdk
• Swift SDK: Native iOS integration
• React Components: Pre-built checkout and wallet UI components
• n8n Nodes: No-code workflow automation
• CLI: Command-line tools for project management

Supported Chains

• EVM: Ethereum, Polygon, Base, Arbitrum, Optimism, BSC, Avalanche
• Solana: Mainnet and devnet
• Stellar: Including USDC and other stablecoins
• Testnets: Available for all major chains

Webhook Events

• Wallet operations: transfers, transactions, signatures
• Payment lifecycle: quotes, payments, delivery
• NFT operations: minting, transfers, burns
• Credential issuance and revocation

Context

Crossmint operates in both staging (testnet) and production (mainnet) environments. The platform handles gas fees automatically through sponsorship, eliminating the need for users to hold native tokens. All monetary values in APIs use string format to prevent precision loss. Wallet addresses can be referenced using multiple locator formats including direct addresses, email/phone identifiers, or custom aliases. The platform enforces rate limits (typically 50-100 requests per second) and requires proper API key scopes for each operation. Compliance features are built into money movement APIs, automatically blocking transfers that violate regulations. For production deployments, account verification and higher rate limits are available through the business verification process.

For additional documentation and navigation, see: https://docs.crossmint.com/llms.txt