{"id":"c7eac379-e8df-4bc0-842f-0a16bcc0dfe6","shortId":"V4mszr","kind":"x402","title":"Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call loan data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides access to loan data (resource ID 71) through the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals).\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of pay-per-call APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nThis specific endpoint (/api/v1/loans/71) is labeled \"Premium API Access\" in the x402 challenge but no further documentation describes the loan data schema, request parameters, or response format. The docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no additional content. Without an OpenAPI spec, example payloads, or detailed documentation, the exact input/output contract is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","loan-data","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","loan data feed"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All doc/pricing/API pages resolve to a minimal 'Connect wallet' prompt with no substantive content","The specific purpose and data returned by /api/v1/loans/71 is undocumented","Cannot verify what 'Premium API Access' actually provides beyond the label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/71","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/loans/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the purpose of '/api/v1/loans/71' is not explained. Effectively a stub 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'/request':17,34 '0.02':16,33,82,133 '000':77 '0x8335':69 '20':76 '2913':70 '6':87 '71':46 'Base network API' 'USDC micropayment API' 'accept':53 'access':40,155 'addit':190 'ai/ml':105 'analyt':104 'api':101,138,154,178 'base':9,26,64,78 'base-network' 'broader':94 'call':4,21,100 'catalog':95 'challeng':159 'classif':109 'commit':146 'connect':185 'content':191 'contract':68,204 'convers':126 'cost':74 'data':6,23,43,103,167 'decim':88 'describ':164 'detail':199 'doc':175 'document':163,200 'embed':110 'endpoint':7,24,36,129,149 'equal':81 'estim':120 'exact':202 'exampl':196 'exchang':115 'feed':114 'financ':111 'format':173 'gas':119 'generat':127 'geocod':124 'host':92 'id':45 'infer':106 'infrastructur':122 'input/output':203 'json':58 'json-response' 'key':139 'label':152 'limit':142 'list':131 'loan':5,22,42,166 'loan API' 'loan data feed' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':38,91 'maximum':73 'minim':184 'minimum':145 'network':65 'no-api-key' 'openapi':194 'page':179 'paramet':170 'pay':2,19,98 'pay-per-cal':1,18,97 'pay-per-call' 'pay-per-request API' 'payload':197 'payment':50,59 'per':3,20,83,99,134 'post':54 'premium':153 'price':113,176 'prompt':187 'protocol':51 'provid':39,90 'quot':118 'rate':116,141 'request':55,84,135,169 'resolv':181 'resourc':44 'respons':172 'return':57 'schema':168 'sentiment':107 'settl':12,29,61 'span':102 'spec':195 'specif':148 'summar':108 'token':117 'unit':79 'unknown':206 'usdc':14,31,67,85 'usdc-settlement' 'use':66,86 'util':123 'valid':125 'via':10,27 'wallet':186 'web3':112 'without':192 'x402':11,28,49,158 'x402 loan endpoint' 'x402-payment'","prices":[{"id":"8a946eb7-825c-4c02-9fa6-b1ba112671e5","listingId":"c7eac379-e8df-4bc0-842f-0a16bcc0dfe6","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/loans/71","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:47.069Z"}],"sources":[{"listingId":"c7eac379-e8df-4bc0-842f-0a16bcc0dfe6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/71","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:47.069Z","lastSeenAt":"2026-04-28T11:33:36.258Z"}],"details":{"listingId":"c7eac379-e8df-4bc0-842f-0a16bcc0dfe6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/71 \\\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 x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/71"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/71"}],"useCases":["Retrieving loan record data on a per-call payment basis without API key management","Integrating loan information into agent workflows that support x402 payment protocol","Accessing financial loan data with instant USDC micropayments on Base"],"bestFor":["Agents or applications that support x402 payment flows on Base","Users who want keyless, pay-per-call access to loan data","Developers prototyping micropayment-gated API integrations"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Bulk data retrieval where per-call pricing would be cost-prohibitive"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.642Z"},"updatedAt":"2026-04-28T11:33:36.258Z"}}