{ "x402Version": 2, "id": 31251, "slug": "31251", "resource": "https://mart402.com/v1/jp-mortgage", "description": "Mortgage schedules: level-payment/level-principal, total interest, prepayment effect (term-reduction or payment-reduction). Deterministic annuity math. $0.005/call.", "type": "http", "serviceName": "Mart402", "resourceType": "AI Inference", "accepts": [ { "scheme": "exact", "network": "eip155:8453", "payTo": "0xE3244a21D0d68bFa78b7CAd8C3b8777aDFbB3188", "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913", "amount": "5000", "amountUsd": 0.005, "maxTimeoutSeconds": 120 } ], "outputSchema": { "properties": { "example": { "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" }, "extensions": { "bazaar": { "info": { "input": { "body": { "annual_rate": 0.012, "months": 420, "principal_yen": 35000000 }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "description": "JSON: monthly payment, total interest, schedule head/tail; prepayment mode returns interest saved + months shortened", "example": { "as_of": null, "assumptions": [], "billable": true, "breakdown": [], "carried_forward": [], "disclaimer": "仮定条件に基づく概算試算。税務相談・手続代行・法律相談ではない。申告・届出への使用不可。確定額は官公署または税理士・社会保険労務士等に確認のこと。", "not_covered": [ "住宅ローン控除(年度別上限・省エネ区分)", "団信・手数料", "変動金利の将来予測" ], "note": "SAMPLE RESPONSE generated by the exact deterministic engine that serves production (jp-statutory has no LLM: same input always produces this byte-identical result, carrying the same rules_version and cited primary sources). Served free at /samples/{product} so you can verify the response shape, the rules_version field and the source citations before paying. No payment was taken. The sample_input shown is the catalog example input that produced this output.", "ok": true, "result": { "method": "level_payment", "monthly_payment_yen": 102095, "months_paid": 421, "schedule_head": [ { "balance_yen": 34932905, "interest_yen": 35000, "month": 1, "payment_yen": 102095, "principal_yen": 67095 }, { "balance_yen": 34865742, "interest_yen": 34932, "month": 2, "payment_yen": 102095, "principal_yen": 67163 }, { "balance_yen": 34798512, "interest_yen": 34865, "month": 3, "payment_yen": 102095, "principal_yen": 67230 } ], "schedule_tail": [ { "balance_yen": 102149, "interest_yen": 204, "month": 419, "payment_yen": 102095, "principal_yen": 101891 }, { "balance_yen": 156, "interest_yen": 102, "month": 420, "payment_yen": 102095, "principal_yen": 101993 }, { "balance_yen": 0, "interest_yen": 0, "month": 421, "payment_yen": 156, "principal_yen": 156 } ], "total_interest_yen": 7880056, "total_paid_yen": 42880056, "total_prepaid_yen": 0 }, "rules_version": "2026.08.18", "sample": true, "sample_input": { "annual_rate": 0.012, "months": 420, "principal_yen": 35000000 }, "sources": [ "deterministic-annuity-math" ], "summary": "借入35,000,000円・年1.200%・420回 -> 毎月102,095円、総利息7,880,056円", "tool": "jp-mortgage", "unverified_rules": [] }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "properties": { "annual_rate": { "type": "number" }, "months": { "type": "number" }, "principal_yen": { "type": "number" } }, "type": "object" }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST", "PUT", "PATCH" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } }, "offer-receipt": { "info": { "offers": [ { "acceptIndex": 0, "format": "jws", "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6ImRpZDp3ZWI6bWFydDQwMi5jb20ja2V5LTEifQ.eyJhbW91bnQiOiI1MDAwIiwiYXNzZXQiOiIweDgzMzU4OWZDRDZlRGI2RTA4ZjRjN0MzMkQ0ZjcxYjU0YmRBMDI5MTMiLCJuZXR3b3JrIjoiZWlwMTU1Ojg0NTMiLCJwYXlUbyI6IjB4RTMyNDRhMjFEMGQ2OGJGYTc4YjdDQWQ4QzNiODc3N2FERmJCMzE4OCIsInJlc291cmNlVXJsIjoiaHR0cHM6Ly9tYXJ0NDAyLmNvbS92MS9qcC1tb3J0Z2FnZSIsInNjaGVtZSI6ImV4YWN0IiwidmFsaWRVbnRpbCI6MTc5MTYyMTM4OCwidmVyc2lvbiI6MX0.6JhhWaWWl97RlOsdGA2-DfAvMF8wIhYmUft-JzE3sjfMy_0JMZqf6fs-MzdsoDu4GEpG3QPiTwiEFGJi-TxfCQ" } ] }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "offers": { "items": { "properties": { "acceptIndex": { "type": "integer" }, "format": { "const": "jws", "type": "string" }, "signature": { "description": "JWS compact serialization containing the offer payload", "type": "string" } }, "required": [ "format", "signature" ], "type": "object" }, "type": "array" } }, "required": [ "offers" ], "type": "object" } } }, "tags": [ "bazaar", "offer-receipt" ], "sourceHost": "mart402.com", "lastUpdated": "2026-10-10T08:31:28.073Z", "quality": { "calls30d": 5, "uniquePayers30d": 4, "lastCalledAt": "2026-10-10T08:31:27.885Z" }, "metadata": { "serviceName": "Mart402", "extensions": { "bazaar": { "info": { "input": { "body": { "annual_rate": 0.012, "months": 420, "principal_yen": 35000000 }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "description": "JSON: monthly payment, total interest, schedule head/tail; prepayment mode returns interest saved + months shortened", "example": { "as_of": null, "assumptions": [], "billable": true, "breakdown": [], "carried_forward": [], "disclaimer": "仮定条件に基づく概算試算。税務相談・手続代行・法律相談ではない。申告・届出への使用不可。確定額は官公署または税理士・社会保険労務士等に確認のこと。", "not_covered": [ "住宅ローン控除(年度別上限・省エネ区分)", "団信・手数料", "変動金利の将来予測" ], "note": "SAMPLE RESPONSE generated by the exact deterministic engine that serves production (jp-statutory has no LLM: same input always produces this byte-identical result, carrying the same rules_version and cited primary sources). Served free at /samples/{product} so you can verify the response shape, the rules_version field and the source citations before paying. No payment was taken. The sample_input shown is the catalog example input that produced this output.", "ok": true, "result": { "method": "level_payment", "monthly_payment_yen": 102095, "months_paid": 421, "schedule_head": [ { "balance_yen": 34932905, "interest_yen": 35000, "month": 1, "payment_yen": 102095, "principal_yen": 67095 }, { "balance_yen": 34865742, "interest_yen": 34932, "month": 2, "payment_yen": 102095, "principal_yen": 67163 }, { "balance_yen": 34798512, "interest_yen": 34865, "month": 3, "payment_yen": 102095, "principal_yen": 67230 } ], "schedule_tail": [ { "balance_yen": 102149, "interest_yen": 204, "month": 419, "payment_yen": 102095, "principal_yen": 101891 }, { "balance_yen": 156, "interest_yen": 102, "month": 420, "payment_yen": 102095, "principal_yen": 101993 }, { "balance_yen": 0, "interest_yen": 0, "month": 421, "payment_yen": 156, "principal_yen": 156 } ], "total_interest_yen": 7880056, "total_paid_yen": 42880056, "total_prepaid_yen": 0 }, "rules_version": "2026.08.18", "sample": true, "sample_input": { "annual_rate": 0.012, "months": 420, "principal_yen": 35000000 }, "sources": [ "deterministic-annuity-math" ], "summary": "借入35,000,000円・年1.200%・420回 -> 毎月102,095円、総利息7,880,056円", "tool": "jp-mortgage", "unverified_rules": [] }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "properties": { "annual_rate": { "type": "number" }, "months": { "type": "number" }, "principal_yen": { "type": "number" } }, "type": "object" }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST", "PUT", "PATCH" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "type": "object" }, "type": { "type": "string" } }, "required": [ "type" ], "type": "object" } }, "required": [ "input" ], "type": "object" } }, "offer-receipt": { "info": { "offers": [ { "acceptIndex": 0, "format": "jws", "signature": "eyJhbGciOiJFZERTQSIsImtpZCI6ImRpZDp3ZWI6bWFydDQwMi5jb20ja2V5LTEifQ.eyJhbW91bnQiOiI1MDAwIiwiYXNzZXQiOiIweDgzMzU4OWZDRDZlRGI2RTA4ZjRjN0MzMkQ0ZjcxYjU0YmRBMDI5MTMiLCJuZXR3b3JrIjoiZWlwMTU1Ojg0NTMiLCJwYXlUbyI6IjB4RTMyNDRhMjFEMGQ2OGJGYTc4YjdDQWQ4QzNiODc3N2FERmJCMzE4OCIsInJlc291cmNlVXJsIjoiaHR0cHM6Ly9tYXJ0NDAyLmNvbS92MS9qcC1tb3J0Z2FnZSIsInNjaGVtZSI6ImV4YWN0IiwidmFsaWRVbnRpbCI6MTc5MTYyMTM4OCwidmVyc2lvbiI6MX0.6JhhWaWWl97RlOsdGA2-DfAvMF8wIhYmUft-JzE3sjfMy_0JMZqf6fs-MzdsoDu4GEpG3QPiTwiEFGJi-TxfCQ" } ] }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "offers": { "items": { "properties": { "acceptIndex": { "type": "integer" }, "format": { "const": "jws", "type": "string" }, "signature": { "description": "JWS compact serialization containing the offer payload", "type": "string" } }, "required": [ "format", "signature" ], "type": "object" }, "type": "array" } }, "required": [ "offers" ], "type": "object" } } } }, "liveness": { "reliability": null }, "verified": false, "featured": false, "provider": { "host": "mart402.com", "manifest_name": "mart402.com", "source": "cdp-mirror", "source_manifest_url": "https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources", "submitted_at": "2026-10-14T01:15:01.050Z" }, "exampleResponse": { "example": {}, "type": "string" } }