{"name":"onyx_x402_demo_wallet","tier":"free","price_usdc":"0","endpoint":"https://onyx-actions.onrender.com/v1/onyx_x402_demo_wallet","method":"POST","input_schema":{"type":"object","properties":{"existing_address":{"type":"string","description":"Existing 0x-prefixed address to check. If omitted, generates an ephemeral sandbox address from `seed`."},"seed":{"type":"string","description":"String seed for deterministic sandbox address generation. Same seed always yields same address. NOT cryptographically secure; sandbox only."}}},"description":"Dev-sandbox wallet helper for x402 testing. Generates a deterministic ephemeral Sepolia wallet (or accepts your address), reports ETH + USDC Sepolia balances, points to the Circle USDC Sepolia faucet, and emits a copy-paste env config for x402 client SDKs. SANDBOX ONLY — generated keys are deterministic and MUST NOT receive real value.","when_to_use":"A developer building or testing an x402 client needs sandbox infrastructure: a testnet address with funded balances, faucet links, and a ready-to-paste config block — without spinning up their own wallet management code.","vs_alternatives":"Existing options: build it yourself (eth_account/viem + faucet hunting + config writing = 30 min). This tool returns it all in one call. Sandbox-only warning is explicit; not a key-management product.","example_request":{"seed":"my-test-agent-01"},"example_response":{"ok":true,"address":"0xABCDEF...","address_source":"deterministic-from-seed","sepolia":{"ok":true,"eth_balance":0.0,"usdc_balance":0.0},"client_env_block":"X402_NETWORK=base-sepolia\n...","next_steps":["1. Fund address...","..."]},"settle_to":"0x3fD9ee1373562f894D322B37DFFAd7a5D2b2d78f","network":"base","facilitator":"https://facilitator.xpay.sh","payment_required":false,"free_introspection":true,"note":"GET this URL = free introspection card. POST with x402 payment header to call."}