Micropayment API Gateway
for AI Agents

# Step 1: Discover APIs$ curl https://api.targe.io/catalog

# Response: List of 8 APIs with pricing

# Step 2: Make API request (get 402 Payment Required)$ curl -i https://api.targe.io/proxy/coingecko/ping

# HTTP/1.1 402 Payment Required# Payment-Required: <base64-payment-requirements># # {"error":"Payment required","amount":"0.001","currency":"USDC",...}

# Step 3: Send USDC payment on Base# Your agent's wallet sends 0.001 USDC to:# Address: 0xBf9D8c0f5c25b7Dea1261333bb341f72bc1244E0# Network: Base Mainnet (Chain ID: 8453)# # Save transaction hash from response

# Step 4: Create payment signature (JSON){  "from": "0xYourAgentWallet",  "to": "0xBf9D8c0f5c25b7Dea1261333bb341f72bc1244E0",  "amount": "0.001",  "network": "eip155:8453",  "txHash": "0xYourTransactionHash",  "timestamp": 1706356800000}

# Encode to base64

# Step 5: Retry request with payment proof$ curl https://api.targe.io/proxy/coingecko/ping \  -H "Payment-Signature: eyJmcm9tIjoiMHguLi4ifQ=="

# HTTP/1.1 200 OK# {"gecko_says":"(V3) To the Moon!"}

$ # 1. Check available APIs$ curl https://api.targe.io/catalog

$ # 2. Make request (get 402 Payment Required)$ curl https://api.targe.io/proxy/coingecko/ping

$ # 3. Send USDC on Base to gateway address$ # Amount: 0.001 USDC$ # To: 0xBf9D8c0f5c25b7Dea1261333bb341f72bc1244E0

$ # 4. Retry with payment signature$ curl https://api.targe.io/proxy/coingecko/ping \  -H "Payment-Signature: <base64-payment>"