{"id":"ac79b539-88b0-4398-8135-bb6e923dc61b","shortId":"psZ9JK","kind":"x402","title":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","tagline":"Mortgage data endpoint on Base, pay-per-call via x402 with USDC.","description":"This endpoint at lowpaymentfee.com provides access to mortgage-related data via a pay-per-request x402 protocol. The specific resource `/api/v1/mortgages/12` is listed under the provider's \"Premium API Access\" label. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with an exact-payment scheme.\n\nThe provider operates a broader platform offering dozens of endpoints across data & analytics, AI/ML, finance/Web3, and infrastructure categories, all priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments. The mortgage endpoint's x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 — consistent with the site-wide pricing.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what the mortgage data actually contains. The endpoint is confirmed live (returns a valid 402 challenge), but the exact data payload and required POST body are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-request","json-response"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan data","real estate finance API","lowpaymentfee","x402 mortgage","USDC pay-per-call"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request body or response format for the mortgages endpoint","The /api/v1/mortgages/12 path is not listed among the provider's advertised endpoints on the homepage","Exact data content and required POST body are unknown — integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/12","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/12","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The mortgage endpoint itself is not listed on the provider's homepage, and all doc pages render only 'Connect wallet'. The actual data content is entirely 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'0.02':107,141 '000':132 '0x8335':78 '20':131 '2913':79 '402':198 '6':137 'USDC pay-per-call' 'accept':62 'access':32,58 'across':96 'actual':188 'advertis':127 'ai/ml':99 'analyt':98 'api':57,112,155 'base':5,18,73,133 'base-network' 'bodi':208 'broader':90 'call':9,22 'categori':103 'challeng':126,199 'commit':120 'confirm':193 'connect':164 'consist':142 'contain':189 'content':170 'contract':77 'data':2,15,37,97,187,203 'decim':138 'doc':154 'document':149,179 'dozen':93 'endpoint':3,16,28,61,95,123,191 'equal':140 'exact':83,202 'exact-pay':82 'exampl':182 'extrem':151 'finance/web3':100 'home loan data' 'infrastructur':102 'json':67 'json-response' 'key':113 'label':59 'limit':116 'list':51 'live':194 'lowpaymentfee' 'lowpaymentfee.com':30 'maxamountrequir':129 'minimum':119 'mortgag':1,14,35,122,186 'mortgage API' 'mortgage data' 'mortgage-data' 'mortgage-rel':34 'network':74 'offer':92 'openapi':174 'oper':88 'page':159 'pay':7,20,41 'pay-per-cal':6,19 'pay-per-request':40 'payload':204 'payment':68,84 'per':8,21,42,108 'platform':91 'post':63,207 'premium':56 'price':105,148,156 'prompt':166 'protocol':45 'provid':31,54,87 'rate':115 'readm':158 'real estate finance API' 'relat':36 'render':161 'request':43,64,109 'request/response':177 'requir':206 'resourc':48 'return':66,195 'schema':178 'scheme':85 'settl':70 'site':146 'site-wid':145 'spars':152 'spec':175 'specif':47 'unit':134 'unknown':210 'usdc':13,26,76,136 'usdc-settlement' 'use':75 'valid':197 'via':10,23,38 'wallet':165 'wide':147 'x402':11,24,44,125 'x402 mortgage' 'x402-payment'","prices":[{"id":"195a49e0-a89e-4126-b1e6-1cb9befaf621","listingId":"ac79b539-88b0-4398-8135-bb6e923dc61b","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:17.918Z"}],"sources":[{"listingId":"ac79b539-88b0-4398-8135-bb6e923dc61b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:17.918Z","lastSeenAt":"2026-04-29T05:34:22.258Z"}],"details":{"listingId":"ac79b539-88b0-4398-8135-bb6e923dc61b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/12 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/12"},{"claim":"Site-wide pricing is $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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/mortgages/12"}],"useCases":["Retrieving mortgage-related data for a specific record (ID 12)","Integrating mortgage information into financial analysis pipelines","Agent-driven on-demand mortgage data lookups without API key management"],"bestFor":["Agents needing keyless, pay-per-call access to mortgage data","Developers experimenting with x402 payment protocol integrations","Low-volume, on-demand mortgage data retrieval"],"notFor":["Bulk mortgage data downloads or high-throughput batch processing (no documented batch endpoints)","Users who need detailed documentation or schema guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:13.219Z"},"updatedAt":"2026-04-29T05:34:22.258Z"}}