{"id":"2e412faf-41bb-4124-8cb7-6c88e37125c3","shortId":"JC7wXB","kind":"x402","title":"Pay-per-call mortgage data endpoint on Base via x402, settled in USDC.","tagline":"Pay-per-call mortgage data endpoint on Base via x402, settled in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific mortgage record (ID 58) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (USD Coin) at a cost of $0.02 per request (20,000 base units with 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 endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services, all priced at $0.02 per request. However, the specific mortgage endpoint (/api/v1/mortgages/58) is not listed on the provider's homepage among the advertised API categories. No documentation, request schema, or response schema is available for this particular endpoint beyond the x402 challenge metadata.\n\nBecause there is no OpenAPI spec, no example responses, and no documentation describing what fields the mortgage record contains or what POST body (if any) is expected, the actual data returned is unknown. The endpoint is confirmed live — it returns a proper 402 challenge — but callers should be aware that the response format is entirely undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","mortgage-data","pay-per-call","no-api-key"],"categories":["finance"],"synonyms":["mortgage API","mortgage data","home loan API","x402 mortgage","pay-per-call mortgage","USDC API","Base network API","lowpaymentfee"],"warnings":["No documentation or schema available for /api/v1/mortgages/58","This specific endpoint is not listed among the provider's advertised APIs on the homepage","Response format and required POST body are completely unknown","Docs, pricing, API, and README pages all render only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/mortgages/58","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/58","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 zero documentation on request/response schema, no OpenAPI spec, and the mortgage endpoint is not even listed among the provider's advertised APIs. Effectively a stub listing with confirmed 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'0.02':69,132 '000':73 '20':72 '402':214 '58':41 '6':77 'Base network API' 'USDC API' 'accept':48 'access':34 'actual':200 'advertis':151 'ai/ml':122 'among':149 'analyt':121 'api':80,118,152 'attach':89 'avail':162 'awar':220 'base':9,23,59,74 'base-network' 'beyond':167 'bodi':194 'broader':107 'call':4,18,117 'caller':87,217 'categori':153 'challeng':170,215 'coin':64 'confirm':208 'contain':190 'cost':67 'crypto':125 'data':6,20,120,201 'decim':78 'describ':184 'document':155,183 'dozen':112 'endpoint':7,21,30,102,139,166,206 'entir':226 'exampl':179 'expect':198 'field':186 'financ':124 'format':224 'header':94 'home loan API' 'homepag':148 'howev':135 'id':40 'infer':123 'json':53 'key':81 'limit':84 'list':143 'live':209 'lowpaymentfee' 'lowpaymentfee.com':32,109 'metadata':171 'mortgag':5,19,38,138,188 'mortgage API' 'mortgage data' 'mortgage-data' 'network':60 'no-api-key' 'offer':111 'openapi':176 'part':104 'particular':165 'pay':2,16,115 'pay-per-cal':1,15,114 'pay-per-call' 'pay-per-call mortgage' 'payment':45,54,93,99 'per':3,17,70,116,133 'platform':108 'post':49,193 'price':130 'proof':100 'proper':213 'protocol':46 'provid':33,146 'rate':83 'record':39,189 'request':50,71,134,156 'requir':86 'respons':159,180,223 'return':52,202,211 'schema':157,160 'servic':128 'settl':12,26,56 'simpli':88 'span':119 'spec':177 'specif':37,137 'undocu':227 'unit':75 'unknown':204 'usd':63 'usdc':14,28,62 'usdc-settlement' 'use':61 'util':127 'valid':97 'via':10,24,42 'x':92 'x-payment':91 'x402':11,25,44,98,169 'x402 mortgage' 'x402-payment'","prices":[{"id":"639595fc-149c-4f0e-a7b9-eef87aead1b3","listingId":"2e412faf-41bb-4124-8cb7-6c88e37125c3","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:48:22.743Z"}],"sources":[{"listingId":"2e412faf-41bb-4124-8cb7-6c88e37125c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/mortgages/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:48:22.743Z","lastSeenAt":"2026-04-29T05:06:25.764Z"}],"details":{"listingId":"2e412faf-41bb-4124-8cb7-6c88e37125c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/mortgages/58 \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/mortgages/58"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/mortgages/58"}],"useCases":["Retrieving mortgage record details for a specific loan ID","Integrating mortgage data into financial analysis pipelines","Agent-driven lookups of mortgage information with instant crypto payment"],"bestFor":["Developers needing on-demand mortgage data without API key management","AI agents that can settle payments via x402 on Base","Prototyping pay-per-call financial data integrations"],"notFor":["Bulk mortgage data retrieval (no documented batch endpoint)","Users who need detailed documentation or response schema guarantees before calling"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:12.999Z"},"updatedAt":"2026-04-29T05:06:25.764Z"}}