{"id":"eeed5faf-1396-4077-af73-2f7143f2d661","shortId":"3FmsgQ","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/66`. 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/66` 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 — consistent with the platform's advertised flat $0.02/request pricing. No API keys are needed; access is granted by attaching an x402 payment header.\n\nDocumentation on the site is extremely sparse — the docs, pricing, API, and README pages all render 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/66` endpoint actually returns. The resource ID `66` suggests it may retrieve data for a specific mortgage record, but this is speculative. The endpoint is confirmed live (returns a valid 402 challenge).","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","mortgage-data","json-response","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","loan data endpoint","real estate finance API","lowpaymentfee","x402 mortgage","USDC pay-per-call"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request parameters or response format","The specific data returned by /api/v1/mortgages/66 is unknown — the resource ID '66' is unexplained","The endpoint is not listed on the provider's own homepage among their advertised APIs"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/66","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no description of what the mortgage endpoint actually returns. The docs pages are empty. This is effectively a stub 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'/request':129 '0.02':119,128 '000':110 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':101 '20':109 '402':214 '6':115 '66':191 'USDC pay-per-call' 'accept':87 'access':34,136 'actual':186 'advertis':126 'ai/ml':65 'amount':104 'analyt':64 'api':61,132,155 'attach':140 'base':5,19,81,99,111 'broader':49 'call':9,23,107 'challeng':215 'confirm':209 'connect':163 'consist':121 'content':169 'contract':100 'crypto':68 'data':2,16,39,63,196 'decim':116 'descript':180 'doc':153 'document':145 'endpoint':3,17,30,85,185,207 'equal':118 'exampl':177 'extrem':150 'financ':67 'flat':127 'gate':73 'grant':138 'header':144 'id':190 'infer':66 'json':92 'json-response' 'key':133 'live':210 'loan data endpoint' 'lowpaymentfee' 'lowpaymentfee.com':32,51 'maximum':103 'may':194 'mortgag':1,15,37,200 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':36 'need':135 'network':82 'no-api-key' 'offer':53 'openapi':173 'page':158 'part':46 'path':42 'pay':7,21,58 'pay-per-cal':6,20 'pay-per-request':57 'payment':77,93,143 'per':8,22,59,106 'platform':50,124 'post':88 'price':130,154 'prompt':165 'protocol':14,28,78 'provid':33 'readm':157 'real estate finance API' 'record':201 'relat':38 'render':160 'request':60,89 'request/response':176 'requir':105 'resourc':189 'retriev':195 'return':91,187,211 'schema':174 'servic':71 'settl':95 'site':148 'span':62 'spars':151 'specif':84,199 'specul':205 'suggest':192 'unit':112 'usd':120 'usdc':11,25,97,114 'usdc-base' 'util':70 'valid':213 'varieti':55 'via':12,26,74 'wallet':164 'x402':13,27,76,142 'x402 mortgage' 'x402-payment'","prices":[{"id":"b8777c29-ac0a-4eab-bc1f-684b32665221","listingId":"eeed5faf-1396-4077-af73-2f7143f2d661","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/66","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:23.362Z"}],"sources":[{"listingId":"eeed5faf-1396-4077-af73-2f7143f2d661","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/66","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:23.362Z","lastSeenAt":"2026-04-29T05:06:25.856Z"}],"details":{"listingId":"eeed5faf-1396-4077-af73-2f7143f2d661","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/66 \\\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 platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/66"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/66"}],"useCases":["Retrieving mortgage record data programmatically","Integrating mortgage information into financial dashboards","Agent-driven lookups of specific mortgage records with micropayments"],"bestFor":["Developers needing on-demand mortgage data without subscription commitments","AI agents that can settle USDC micropayments on Base","Applications requiring keyless, pay-per-use API access"],"notFor":["Users who need detailed API documentation or schema guarantees before integrating","Bulk mortgage data retrieval (pay-per-call model may be costly at scale)","Non-crypto users who cannot settle payments on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.888Z"},"updatedAt":"2026-04-29T05:06:25.856Z"}}