Buy a travel eSIM - via x402 USDC Base Wallet

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

NetworkUse CaseeSIM TypeBase Mainnet (default)Production purchasesReal eSIMsBase SepoliaDevelopment/testingMock 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

Determine network: Ask or detect if user wants mainnet (real) or testnet (testing) Discover needs: Ask which country they need data for Search packages: Query esimqr.link for available packages Present options: Show available data plans with prices Get selection: User picks a package Confirm purchase: Show price, network (mainnet/testnet), and wallet balance, get confirmation 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 Deliver eSIM: Return the esimPageUrl - a user-friendly page with QR code and install buttons

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)

EndpointMethodDescription/api/agent/quoteGETGet price quote/api/agent/purchasePOSTInitiate/complete purchase/api/agent/esim/{id}GETGet eSIM status

Testnet Endpoints (Testing)

EndpointMethodDescription/api/agent-testnet/quoteGETGet price quote/api/agent-testnet/purchasePOSTInitiate/complete purchase/api/agent-testnet/esim/{id}GETGet eSIM status

Shared Endpoints (Both Networks)

EndpointMethodDescription/api/web3/packages?q={country}GETSearch 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

Base Mainnet (Default)

ParameterValueNetworkBase MainnetChain ID8453CAIP-2eip155:8453USDC Token0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913USDC Decimals6

Base Sepolia (Testnet)

ParameterValueNetworkBase Sepolia (testnet)Chain ID84532CAIP-2eip155:84532USDC Token0x036CbD53842c5426634e7929541eC2318f3dCF7eUSDC Decimals6 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: SchemeHeaderWallet RequirementsGasexactPAYMENT-SIGNATUREEIP-3009 signing (Circle, x402 SDK)GaslesstransferX-PAYMENTStandard USDC transferYou 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):

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

Transfer Scheme Flow:

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

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