{"id":"94240b06-c2e2-4603-801b-dee98953493c","shortId":"JRnQPz","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call with USDC via x402 protocol.","tagline":"Mortgage data endpoint on Base, pay-per-call with USDC via x402 protocol.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data at the path `/api/v1/mortgages/76`. It is part of a broader platform (lowpaymentfee.com) that offers a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated via the x402 payment protocol on the Base network.\n\nThe specific endpoint `/api/v1/mortgages/76` accepts POST requests and returns JSON. Payment is settled in USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. This is consistent with the platform's advertised flat pricing of $0.02 per request across all endpoints. No API keys are required; access is granted by attaching an x402 payment header.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/mortgages/76` endpoint actually returns. The resource ID `76` in the path suggests it may return data for a specific mortgage record or product, but this is speculative. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what request body to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-api","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","lowpaymentfee","x402 mortgage","USDC pay-per-call","Base network API","real estate finance API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request body or response format for /api/v1/mortgages/76.","The specific purpose of the '/mortgages/76' resource is unknown; the number 76 may be a record ID but this is unverified.","The platform lists many endpoint categories (AI, analytics, finance, etc.) but none explicitly mention a mortgages endpoint, raising questions about whether this is a real data source or a placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/76","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/mortgages/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the mortgages/76 endpoint actually does. This is effectively a stub 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'0.02':119,132 '000':110 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':101 '20':109 '402':224 '6':115 '76':196 'Base network API' 'USDC pay-per-call' 'accept':87 'access':34,143 'across':135 'actual':191 'advertis':128 'ai/ml':65 'amount':104 'analyt':64 'api':61,139,159 'attach':147 'base':5,19,81,99,111 'bodi':236 'broader':49 'call':9,23,107 'challeng':225 'confirm':219 'connect':168 'consist':123 'content':174 'contract':100 'crawl':157 'crypto':68 'data':2,16,39,63,204 'decim':116 'descript':185 'difficult':231 'doc':158 'document':152,228 'endpoint':3,17,30,85,137,190,217 'equal':118 'exampl':182 'expect':243 'extrem':154 'financ':67 'flat':129 'gate':73 'grant':145 'header':151 'home loan API' 'id':195 'infer':66 'json':92 'json-api' 'key':140 'know':233 'live':220 'lowpaymentfee' 'lowpaymentfee.com':32,51 'maximum':103 'may':202 'mortgag':1,15,37,208 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'network':82 'no-api-key' 'offer':53 'openapi':178 'page':163 'part':46 'path':42,199 'pay':7,21,58 'pay-per-cal':6,20 'pay-per-request':57 'payment':77,93,150 'per':8,22,59,106,133 'platform':50,126 'post':88 'price':130,160 'product':211 'prompt':170 'proper':223 'protocol':14,28,78 'provid':33 'readm':162 'real estate finance API' 'record':209 'relat':38 'request':60,89,134,235 'request/response':181 'requir':105,142 'resourc':194 'respons':241 'return':91,165,192,203,221 'schema':179 'send':238 'servic':71 'settl':95 'span':62 'spars':155 'specif':84,207 'specul':215 'suggest':200 'unit':112 'usd':120 'usdc':11,25,97,114 'usdc-base' 'util':70 'varieti':55 'via':12,26,74 'wallet':169 'without':227 'x402':13,27,76,149 'x402 mortgage' 'x402-payment'","prices":[{"id":"e7f9a61f-be8b-4365-bb23-f586e2709bf2","listingId":"94240b06-c2e2-4603-801b-dee98953493c","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/mortgages/76","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:22.135Z"}],"sources":[{"listingId":"94240b06-c2e2-4603-801b-dee98953493c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/76","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:22.135Z","lastSeenAt":"2026-04-29T05:06:25.811Z"}],"details":{"listingId":"94240b06-c2e2-4603-801b-dee98953493c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/76 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/76"},{"claim":"Platform advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/76"}],"useCases":["Retrieving mortgage-related data for a specific record or product","Integrating mortgage information into financial dashboards or agent workflows","Programmatic access to mortgage data without traditional API key registration"],"bestFor":["Developers experimenting with x402 pay-per-call APIs","Agents that need on-demand mortgage data with crypto micropayments","Projects already using USDC on Base for API payments"],"notFor":["Users needing well-documented mortgage APIs with clear schemas and examples","Production systems requiring guaranteed SLAs and detailed error handling documentation","Users who cannot pay with USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.994Z"},"updatedAt":"2026-04-29T05:06:25.811Z"}}