{"name":"Boundary Guard Seller Launch Kit","headline":"Launch an x402 API that agents can pay for, trust, and prove.","audience":["x402 API sellers","agent tool marketplaces","wallet-capable agent builders","MCP and paid-tool routers","teams adding receipts to paid agent workflows"],"outcome":"Package one paid endpoint with Boundary Guard receipts, workflow audit, receipt verification, seller-safe marketplace copy, and a repeatable seed-proof checklist.","proof_boundary":"Boundary Guard has 13 paid endpoint records in source discovery metadata. All 13 are seeded through internal Base-mainnet seed payments and visible in CDP discovery metadata plus Agentic detail. This is operational proof only; it is not a claim of customer revenue, customer adoption, or third-party endorsement.","checklist":[{"step":"Expose a paid x402 endpoint","detail":"Serve OpenAPI, /llms.txt, /.well-known/x402, provider URL, docs URL, category, tags, and exact Base-mainnet USDC pricing."},{"step":"Wrap the agent-facing workflow","detail":"Run Boundary Guard /guard before irreversible action, /workflow-audit before multi-step execution, and /receipt-verify before trusting supplied payment evidence."},{"step":"Seed once with a controlled wallet","detail":"Make one internal paid call per endpoint, record the non-secret tx hash, route, amount, network, and receipt id, and label it internal seed proof."},{"step":"Verify discovery","detail":"Check the live Render paid host, Vercel preview, x402 402 challenge, CDP merchant discovery, Agentic detail, OpenAPI, llms.txt, and well-known inventory."},{"step":"Publish proof-safe copy","detail":"Say what is live and seeded. Do not claim customer revenue, marketplace ranking, partner endorsement, or production adoption until external evidence exists."}],"example_wrapper":{"language":"python","summary":"Call a paid endpoint, keep the x402 payment response, then verify the receipt package before an agent trusts the result.","code":"import requests\n\npaid_response = wallet_client.post(\n    \"https://seller.example/api/quote\",\n    json={\"symbol\": \"ETH\"},\n)\n\nverification = requests.post(\n    \"https://boundary-guard-x402.onrender.com/receipt-verify\",\n    json={\n        \"receipt\": paid_response.json()[\"boundary_receipt\"],\n        \"allowed_policy_versions\": [\"guard-v1\", \"workflow-audit-v1\"],\n        \"payment\": {\n            \"network\": \"eip155:8453\",\n            \"currency\": \"USDC\",\n            \"amount_atomic\": 10000,\n            \"tx_hash\": paid_response.headers.get(\"x-payment-tx-hash\"),\n            \"resource\": \"https://seller.example/api/quote\",\n        },\n    },\n)\nverification.raise_for_status()\nassert verification.json()[\"decision\"] in {\"accept\", \"review\"}\n"},"marketplace_copy":{"title":"x402 Receipt Wrapper for Agent APIs","short_description":"Add pre-flight guardrails, workflow audit, and receipt verification to paid x402 endpoints before agents trust the result.","buyer_queries":["x402 receipt verification","agent payment safety","paid API guardrails","agent workflow audit","Base USDC API receipts","MCP payment trust"],"tags":["x402","receipts","agent-safety","payment-safety","workflow-audit","settlement-evidence","api-monetization"]},"seed_proof_checklist":["Route and method","Price, currency, and network","HTTP 402 challenge before payment","Transaction hash or payment reference, redacted when needed","Boundary Guard receipt id and policy version","Render/Vercel manifest check","CDP merchant discovery check","Agentic detail check","x402scan or external transaction check when available"],"urls":{"html":"/seller-launch-kit","json":"/seller-launch-kit.json","html_absolute":"https://boundary-guard-x402.onrender.com/seller-launch-kit","json_absolute":"https://boundary-guard-x402.onrender.com/seller-launch-kit.json","docs":"https://boundary-guard-x402.onrender.com/docs","openapi":"https://boundary-guard-x402.onrender.com/openapi.json","x402_inventory":"https://boundary-guard-x402.onrender.com/.well-known/x402"}}