{"id":"12ce88dc-0555-4411-a70e-ad94be3bec98","shortId":"Vk9GA3","kind":"x402","title":"x402-payable mortgage data endpoint on Base, settled in USDC at $0.02 per request.","tagline":"x402-payable mortgage data endpoint on Base, settled in USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data via the x402 payment protocol. The specific resource `/api/v1/mortgages/78` accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum amount of 20,000 base units, which equals $0.02 USD (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe provider, lowpaymentfee.com, hosts a broad catalog of x402-payable APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced uniformly at $0.02 per request. However, the `/api/v1/mortgages/78` path is not listed on the provider's public landing page among the advertised endpoints. This suggests it may be an unlisted or legacy resource. No documentation, request schema, or response schema is available for this specific endpoint beyond the x402 challenge metadata.\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation describing what mortgage data is returned or what POST body is expected, the practical utility of this endpoint is uncertain without experimentation. The endpoint is confirmed live (returns a valid 402 challenge), but callers should be prepared to discover the request format through trial.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","json-response","post-method","no-api-key","pay-per-request"],"categories":["finance"],"synonyms":["mortgage API","mortgage data endpoint","x402 mortgage","USDC pay-per-call","Base network API","lowpaymentfee mortgage","real estate data API"],"warnings":["No documentation or schema available for the /api/v1/mortgages/78 endpoint","This endpoint path is not listed on the provider's public landing page — may be unlisted or legacy","Request body format is unknown; callers must discover it experimentally","The docs, pricing, API, and README pages all returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/78","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and the /mortgages/78 path is not listed among the provider's advertised endpoints. Effectively a stub with confirmed 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'0.02':13,28,79,133 '000':74 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':67 '20':73 '402':224 '6':83 'Base network API' 'USDC pay-per-call' 'accept':51 'access':36 'advertis':152 'ai/ml':122 'among':150 'amount':71 'analyt':121 'api':86,118 'attach':95 'avail':172 'base':8,23,62,75 'base-network' 'beyond':177 'bodi':203 'broad':112 'caller':93,227 'catalog':113 'challeng':180,225 'confirm':219 'contract':66 'crypto':125 'data':5,20,41,120,197 'decim':84 'describ':194 'discov':232 'document':165,193 'endpoint':6,21,32,153,176,211,217 'equal':78 'exampl':190 'expect':205 'experiment':215 'financ':124 'format':235 'header':100 'host':110 'howev':136 'infer':123 'json':56 'json-response' 'key':87 'land':148 'legaci':162 'limit':90 'list':142 'live':220 'lowpaymentfee mortgage' 'lowpaymentfee.com':34,109 'maximum':70 'may':157 'metadata':181 'mortgag':4,19,39,196 'mortgage API' 'mortgage data endpoint' 'mortgage-data' 'mortgage-rel':38 'network':63 'no-api-key' 'openapi':186 'page':149 'path':139 'pay-per-request' 'payabl':3,18,117 'payment':45,57,99,105 'per':14,29,134 'post':52,202 'post-method' 'practic':207 'prepar':230 'price':130 'proof':106 'protocol':46 'provid':35,108,145 'public':147 'rate':89 'real estate data API' 'relat':40 'request':15,30,53,135,166,234 'request/response':189 'requir':92 'resourc':49,163 'respons':169 'return':55,199,221 'schema':167,170 'servic':128 'settl':9,24,59 'simpli':94 'span':119 'spec':187 'specif':48,175 'suggest':155 'trial':237 'uncertain':213 'uniform':131 'unit':76 'unlist':160 'usd':80 'usdc':11,26,65,81 'usdc-settlement' 'use':64,82 'util':127,208 'valid':103,223 'via':42 'without':214 'x':98 'x-payment':97 'x402':2,17,44,104,116,179 'x402 mortgage' 'x402-payable':1,16,115 'x402-payment'","prices":[{"id":"a205bf17-5ddb-4953-b960-c4d3679eba7f","listingId":"12ce88dc-0555-4411-a70e-ad94be3bec98","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:30.602Z"}],"sources":[{"listingId":"12ce88dc-0555-4411-a70e-ad94be3bec98","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:30.602Z","lastSeenAt":"2026-04-29T04:33:44.521Z"}],"details":{"listingId":"12ce88dc-0555-4411-a70e-ad94be3bec98","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/78 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/78"},{"claim":"The provider advertises $0.02 per request 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/78"}],"useCases":["Retrieving mortgage-related data for a specific resource (ID 78)","Integrating pay-per-call mortgage information into financial applications","Agent-driven mortgage data lookups without API key provisioning"],"bestFor":["Developers needing on-demand mortgage data without subscription commitments","AI agents that can settle x402 payments on Base in USDC","Prototyping financial tools that consume per-call paid APIs"],"notFor":["Users who need documented request/response schemas before integrating","Bulk mortgage data retrieval (pay-per-request model may be costly at scale)","Non-crypto users who cannot settle payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.555Z"},"updatedAt":"2026-04-29T04:33:44.521Z"}}