{"marketplace":"Mahshar","description":"AI-powered API marketplace with USDC micropayments via x402 on Arc","network":"eip155:5042002","payment_protocol":"x402","payment_domain":{"name":"GatewayWalletBatched","version":"1","verifyingContract":"0x0077777d7EBA4688BDeF3E311b846F25870A19B9"},"usdc_asset":"0x3600000000000000000000000000000000000000","how_to_pay":"POST to /api/proxy with {api_id, buyer_wallet} and no payment-signature header to receive a 402 response with a base64-encoded PAYMENT-REQUIRED header. Decode it (base64 -> JSON), sign a TransferWithAuthorization EIP-712 message using payment_domain and the amount/payTo from the decoded requirements, then retry the same POST with a 'payment-signature' header containing the base64-encoded payment payload.","error_responses":{"402":"Payment required — decode PAYMENT-REQUIRED header for payment instructions, or payment verification/settlement failed","403":"API is not active","404":"API not found or inactive","500":"Internal processing error"},"apis":[{"id":"34c7a931-81de-4b8b-81ac-0916b4316989","name":"Ioscope Wallet Risk Scoring","description":"Wallet risk scoring and behavioral analysis for Arc, Base, and Soneium chains. POST an address and chain, get back a risk score, bot probability, AI classification (whale, developer, bot, etc.), transaction metrics, and detected patterns like MEV, honeypot, and bridge activity.","category":"Finance","price_per_call_usdc":0.01,"payment_model":"pay-per-call","auth_type":"public","score":6,"verified":false,"example_request":"{\"address\": \"0x1234567890123456789012345678901234567890\", \"chain\": \"arc\"}","example_response":{"riskScore":23,"botProbability":0.05,"aiAnalysis":{"classification":"defi_power_user"},"metrics":{"txCount":142,"totalVolumeIn":"1500.00"}},"total_calls":23,"success_rate":0.7,"avg_latency_ms":2252},{"id":"9d0925d5-dc47-4746-808c-be8a03d8244f","name":"Random Joke API","description":"Returns a random programming-related joke in JSON format. Useful for chatbots, developer tools, or adding humor to applications. No authentication required, instant response.","category":"AI","price_per_call_usdc":0.006,"payment_model":"pay-per-call","auth_type":"public","score":8,"verified":false,"example_request":"{}","example_response":{"id":1,"type":"general","setup":"Why do programmers prefer dark mode?","punchline":"Because light attracts bugs."},"total_calls":2,"success_rate":1,"avg_latency_ms":350},{"id":"494b46ae-5853-4f99-b7cd-36ea21429650","name":"Currency Exchange API","description":"Returns real-time currency exchange rates for over 160 currencies, using USD as the base. Useful for e-commerce pricing, financial dashboards, and travel apps. No authentication required.","category":"Finance","price_per_call_usdc":0.005,"payment_model":"pay-per-call","auth_type":"public","score":8,"verified":true,"example_request":"{\"base\": \"USD\"}","example_response":{"base_code":"USD","rates":{"EUR":0.92,"TRY":32.5,"GBP":0.79}},"total_calls":13,"success_rate":1,"avg_latency_ms":104}]}