Buy a travel eSIM - via x402 USDC Base Wallet

Purchase travel eSIM data plans using USDC on Base Mainnet or Sepolia testnet via x402, with eSIM delivery via a QR code installation page.

Get eSIM Skill

Purchase eSIM data packages using USDC on Base Mainnet (or testnet for testing) via the x402 protocol.

Description

This skill enables AI agents to purchase eSIM data packages for users. It uses the x402 payment protocol to pay with USDC on Base Mainnet (default) or Base Sepolia testnet (for testing), then delivers the eSIM installation page.

Default Network: Base Mainnet (production - real eSIMs) Test Network: Base Sepolia (testing - mock eSIMs)

Prerequisites

• A wallet skill or USDC-capable wallet on Base (Mainnet or Sepolia)
• USDC balance for purchases
• ETH for gas (if using transfer scheme)

Suggested wallets: Coinbase Agentic Wallet, any x402-compatible wallet, or any wallet that supports Base USDC transfers.

Network Selection

By default, purchases happen on Base Mainnet (real eSIMs). For testing, explicitly specify the testnet network.

When to Use Each Network

Network	Use Case	eSIM Type
Base Mainnet (default)	Production purchases	Real eSIMs
Base Sepolia	Development/testing	Mock eSIMs

Specifying Network

The user can indicate their preference by:

• Saying "testnet", "testing", "mock", or "demo" → Use Sepolia testnet
• Not specifying, or saying "mainnet", "production", "real" → Use Base mainnet (default)

Invocation

Use this skill when a user:

• Asks for an eSIM or mobile data
• Needs cellular data for travel
• Wants to buy a data plan for a specific country
• Mentions needing connectivity abroad
• Requests "test" or "mock" eSIM for development

Important: Transaction Timing

Crypto and eSIM transactions are NOT instant. Expect:

• USDC transfer: 5-15 seconds for on-chain confirmation
• Purchase completion: Additional 3-30 seconds for API to verify the transaction on-chain
• Total purchase flow: Can take 30-60 seconds from payment initiation to eSIM delivery

Inform the user that the purchase is processing and to wait for confirmation.

Workflow

1. Determine network: Ask or detect if user wants mainnet (real) or testnet (testing)
2. Discover needs: Ask which country they need data for
3. Search packages: Query esimqr.link for available packages
4. Present options: Show available data plans with prices
5. Get selection: User picks a package
6. Confirm purchase: Show price, network (mainnet/testnet), and wallet balance, get confirmation
7. Execute x402 flow:
   • POST to /api/agent/purchase (mainnet) or /api/agent-testnet/purchase (testnet) → receive 402 with payment details
   • Pay using your wallet
   • Retry POST with payment proof header
8. Deliver eSIM: Return the esimPageUrl - a user-friendly page with QR code and install buttons

Example Conversation

Mainnet (Real eSIM)

User: I need an eSIM for my trip to USA

Agent: I can help you get an eSIM! This will be a real eSIM on Base Mainnet.

[Agent searches packages]

I found these options for USA:
- US_100MB_7: 100MB / 7 Days - $0.50
- US_1_7: 1GB / 7 Days - $1.18
- US_3_7: 3GB / 7 Days - $2.50
- US_5_30: 5GB / 30 Days - $4.42

Which package would you like?

User: 1GB 7 days

Agent: The US 1GB 7-Day plan costs $1.18 USDC on Base Mainnet.

My wallet balance: $30.00 USDC

Shall I purchase this eSIM now?

User: Yes

Agent: Initiating purchase on Base Mainnet...

✓ Payment sent: 1.18 USDC
✓ Transaction: 0xabc123...

Your eSIM is ready! Install it here:
https://esimqr.link/web3/esim/agent_1707184523_abc123

Testnet (Mock eSIM for Testing)

User: Get me a test eSIM for USA

Agent: I'll get you a test eSIM on Base Sepolia testnet (mock eSIM for testing).

[Agent searches packages on testnet]

I found test packages for USA:
- US_1_7: 1GB / 7 Days - $1.18 (testnet)
- US_5_30: 5GB / 30 Days - $4.42 (testnet)

Which would you like?

User: 1GB

Agent: The US 1GB 7-Day test plan costs $1.18 testnet USDC.

My wallet balance: 10.00 testnet USDC

Shall I purchase this test eSIM?

User: Yes

Agent: Initiating testnet purchase...

✓ Test payment sent: 1.18 USDC
✓ Transaction: 0xdef456...

Your mock eSIM is ready! (For testing only):
https://esimqr.link/web3/esim/mockagent_1707184523_abc123

API Endpoints

Base URL: https://esimqr.link

Mainnet Endpoints (Production)

Endpoint	Method	Description
/api/agent/quote	GET	Get price quote
/api/agent/purchase	POST	Initiate/complete purchase
/api/agent/esim/{id}	GET	Get eSIM status

Testnet Endpoints (Testing)

Endpoint	Method	Description
/api/agent-testnet/quote	GET	Get price quote
/api/agent-testnet/purchase	POST	Initiate/complete purchase
/api/agent-testnet/esim/{id}	GET	Get eSIM status

Shared Endpoints (Both Networks)

Endpoint	Method	Description
/api/web3/packages?q={country}	GET	Search packages (works for both)

Rate Limiting

• Limit: 10 requests per minute per IP
• Response: HTTP 429 with Retry-After header
• Handle rate limits gracefully by respecting the Retry-After value

Network Configuration

Base Mainnet (Default)

Parameter	Value
Network	Base Mainnet
Chain ID	8453
CAIP-2	eip155:8453
USDC Token	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
USDC Decimals	6

Base Sepolia (Testnet)

Parameter	Value
Network	Base Sepolia (testnet)
Chain ID	84532
CAIP-2	eip155:84532
USDC Token	0x036CbD53842c5426634e7929541eC2318f3dCF7e
USDC Decimals	6

Note: Payment wallet addresses are returned dynamically by the API in quote and 402 responses. Do not hardcode payment addresses.

Payment Schemes (x402)

The 402 response offers two payment options in the accepts array. Choose based on your wallet capabilities:

Scheme	Header	Wallet Requirements	Gas
exact	PAYMENT-SIGNATURE	EIP-3009 signing (Circle, x402 SDK)	Gasless
transfer	X-PAYMENT	Standard USDC transfer	You pay gas

Which Scheme to Use

• Use exact if: Your wallet supports EIP-3009 transferWithAuthorization signing (Circle wallets, x402-compatible SDKs). Benefits: gasless - the facilitator broadcasts for you.

• Use transfer if: Your wallet can do standard USDC transfers but doesn't support EIP-3009. Works with any wallet that supports Base. You pay gas fees.

• Not sure?: The transfer scheme works with any USDC-capable wallet.

Exact Scheme Flow (gasless):

1. POST /api/agent/purchase (mainnet) or /api/agent-testnet/purchase (testnet) → receive 402 with EIP-3009 parameters
2. Sign a transferWithAuthorization message (no on-chain tx needed)
3. Retry POST with header: PAYMENT-SIGNATURE: <base64-encoded-payload>
4. Facilitator broadcasts the transaction for you

Transfer Scheme Flow:

1. POST /api/agent/purchase (mainnet) or /api/agent-testnet/purchase (testnet) → receive 402 with payment details
2. Transfer USDC on-chain to payTo address (on the correct network!)
3. Retry POST with header: X-PAYMENT: txHash=0x...,nonce=...

API Response Examples

Search Packages

GET /api/web3/packages?q=US

{
  "packages": [
    {"packageCode": "US_1_7", "name": "United States 1GB 7Days", ...}
  ]
}

Quote (Mainnet)

GET /api/agent/quote?packageCode=US_1_7

{
  "packageCode": "PHAJHEAYP",
  "slug": "US_1_7",
  "planName": "United States 1GB 7Days",
  "usdcAmount": "1.18",
  "paymentDetails": {
    "recipient": "<payment-address-from-api>",
    "chainId": 8453,
    "network": "eip155:8453"
  }
}

Quote (Testnet)

GET /api/agent-testnet/quote?packageCode=US_1_7

{
  "packageCode": "PHAJHEAYP",
  "slug": "US_1_7",
  "planName": "United States 1GB 7Days",
  "usdcAmount": "1.18",
  "paymentDetails": {
    "recipient": "<payment-address-from-api>",
    "chainId": 84532,
    "network": "eip155:84532"
  },
  "isTestnet": true
}

402 Payment Required

POST /api/agent/purchase
Body: {"packageCode": "US_1_7"}

{
  "x402Version": 2,
  "accepts": [
    {"scheme": "exact", ...},
    {"scheme": "transfer", "amount": "1180000", "payTo": "<payment-address-from-api>", "extra": {"nonce": "abc123"}}
  ]
}

Important: Always use the payTo address from the 402 response. Never hardcode payment addresses.

Purchase Success

POST /api/agent/purchase
Headers: X-PAYMENT: txHash=0x...,nonce=abc123
Body: {"packageCode": "US_1_7"}

{
  "success": true,
  "esimId": "agent_1707184523_abc123",
  "esimPageUrl": "https://esimqr.link/web3/esim/agent_1707184523_abc123",
  "esimDetails": {
    "iccid": "8901234...",
    "activationCode": "LPA:1$..."
  }
}

Status Values

• pending - Order created, awaiting provisioning
• processing - eSIM being provisioned
• ready - eSIM ready for installation
• activated - eSIM installed on device
• failed - Order failed (contact support)
• cancelled - Mock eSIM auto-cancelled (testnet only)

Documentation

• Mainnet: https://esimqr.link/api/agent/docs
• Testnet: https://esimqr.link/api/agent-testnet/docs
• Landing: https://esimqr.link/agents

Files

• esim_api.py - API client for esimqr.link (supports both mainnet and testnet)

Dependencies

requests>=2.28.0

Hackathon Submission

• Track: Agentic Commerce
• Protocol: x402 (HTTP 402 Payment Required)
• Networks: Base Mainnet (production), Base Sepolia (testing)
• Payment: USDC

Submitted to: https://www.moltbook.com/m/usdc