{"id":"797d4977-e0ec-4b61-9729-ffc23222dfb7","shortId":"9sMwJV","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 a specific loan record (ID 51) via 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 charge of 20,000 base units (0.02 USDC, i.e. $0.02 per request).\n\nlowpaymentfee.com is a broader platform offering multiple pay-per-call API categories including 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 advertised at $0.02 per request with no API keys, no rate limits, and no minimum commitments. Payment is handled entirely through the x402 protocol on the Base L2 network.\n\nThis specific endpoint (/api/v1/loans/51) is labeled \"Premium API Access\" and falls outside the clearly documented categories on the landing page. There is no detailed documentation describing the request body schema or the response payload for this loans endpoint. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. As a result, the exact data returned and the expected input format remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","loan-data","pay-per-call","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["loan API","x402 API","micropayment API","USDC pay-per-call","Base network API","loan record endpoint","crypto-paid API"],"warnings":["No documentation exists for the /api/v1/loans/51 endpoint; request and response schemas are unknown.","The docs, pricing, API, and README pages all returned only 'Connect wallet' with no content.","This specific loans endpoint is not listed among the advertised API categories on the landing page.","The label 'Premium API Access' is generic and does not describe what data is returned."],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/51","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/51","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 documentation for the /api/v1/loans/51 endpoint—no request schema, no response schema, no examples. The docs/pricing/API pages are empty stubs. The endpoint's purpose (\"Premium API Access\" for a loan record) is vague and not described anywhere on the 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'/request':17,34 '0.02':16,33,81,84,131 '000':78 '0x8335':70 '20':77 '2913':71 '51':47 'Base network API' 'USDC pay-per-call' 'accept':54 'access':40,166 'advertis':129 'ai/ml':103 'analyt':102 'api':98,136,165,198 'base':9,26,65,79,155 'base-network' 'bodi':186 'broader':90 'call':4,21,97 'categori':99,173 'charg':75 'classif':107 'clear':171 'commit':144 'connect':207 'content':213 'contract':69 'convers':124 'crypto-paid API' 'data':6,23,101,219 'describ':183 'detail':181 'doc':197 'document':172,182 'embed':108 'endpoint':7,24,36,127,160,195 'entir':148 'estim':118 'exact':218 'exchang':113 'expect':223 'fall':168 'feed':112 'financ':109 'format':225 'gas':117 'generat':125 'geocod':122 'handl':147 'i.e':83 'id':46 'includ':100 'infer':104 'infrastructur':120 'input':224 'json':59 'json-response' 'key':137 'l2':156 'label':163 'land':176 'limit':140 'loan':5,22,44,194 'loan API' 'loan record endpoint' 'loan-data' 'lowpaymentfee.com':38,87 'maximum':74 'micropayment API' 'minimum':143 'multipl':93 'network':66,157 'no-api-key' 'offer':92 'outsid':169 'page':177,202 'pay':2,19,95 'pay-per-cal':1,18,94 'pay-per-call' 'payload':191 'payment':51,60,145 'per':3,20,85,96,132 'platform':91 'post':55 'premium':164 'price':111,199 'prompt':209 'protocol':52,152 'provid':39 'quot':116 'rate':114,139 'readm':201 'record':45 'remain':226 'request':56,86,133,185 'respons':190 'result':216 'return':58,204,220 'schema':187 'sentiment':105 'settl':12,29,62 'specif':43,159 'substant':212 'summar':106 'token':115 'unit':80 'unknown':227 'usdc':14,31,68,82 'usdc-settlement' 'use':67 'util':121 'valid':123 'via':10,27,48 'wallet':208 'web3':110 'x402':11,28,50,151 'x402 API' 'x402-payment'","prices":[{"id":"852c4c30-7e3c-4664-af4f-2c980a5fa538","listingId":"797d4977-e0ec-4b61-9729-ffc23222dfb7","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/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:40.392Z"}],"sources":[{"listingId":"797d4977-e0ec-4b61-9729-ffc23222dfb7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:40.392Z","lastSeenAt":"2026-04-28T13:33:35.522Z"}],"details":{"listingId":"797d4977-e0ec-4b61-9729-ffc23222dfb7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/51 \\\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 requesting USDC payment on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/loans/51"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/51"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving loan record data on a per-call payment basis without API key registration","Integrating pay-per-call financial data into agent workflows via x402","Accessing loan information programmatically with USDC micropayments on Base"],"bestFor":["Agents or developers who want keyless, pay-per-call access to loan data","Users already holding USDC on the Base network","Workflows requiring on-demand financial record lookups without subscriptions"],"notFor":["Users needing detailed API documentation or well-defined schemas before integration","Bulk data retrieval where per-call pricing would be cost-prohibitive","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.971Z"},"updatedAt":"2026-04-28T13:33:35.522Z"}}