{"id":"94709016-32ed-4135-9166-d9cd329ca1fe","shortId":"WHcCWa","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 resource (`/api/v1/loans/59`) 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 $0.02 per request (20,000 base units at 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 broader lowpaymentfee.com platform advertises a range of pay-per-call APIs spanning data analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance/Web3 data (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 the same x402 payment model on Base.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/loans/59` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what data to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","loan-data","json-response","no-api-key","post-method"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema provided; unknown what data /api/v1/loans/59 returns or what POST body it expects","The endpoint path '/api/v1/loans/59' references a specific resource ID (59) with no explanation of what it represents","The broader platform lists many endpoint categories but none are documented beyond titles and prices"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/59","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/59","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 format, response schema, or what 'loans/59' actually represents. No OpenAPI spec, no examples, and all doc pages are empty wallet-connect stubs. Effectively a stub 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'/request':17,34 '0.02':16,33,76,153 '000':80 '0x8335':69 '20':79 '2913':70 '402':212 '402 payment API' '6':84 'Base network API' 'USDC micropayment API' 'accept':53 'access':40 'actual':203 'addit':184 'advertis':112 'ai/ml':124 'analysi':127 'analyt':123 'api':87,120,170 'attach':96 'base':9,26,64,81,163 'base-network' 'broader':109 'call':4,21,119 'caller':94 'challeng':213 'charg':74 'classif':129 'connect':179 'contract':68 'convers':146 'data':6,23,122,132,225 'decim':85 'descript':197 'detail':186 'difficult':221 'doc':169 'document':164,218 'embed':130 'endpoint':7,24,36,149,202,206 'estim':140 'exampl':194 'exchang':135 'expect':232 'extrem':166 'feed':134 'finance/web3':131 'gas':139 'generat':147 'geocod':144 'header':101 'infer':125 'infrastructur':142 'json':58 'json-response' 'key':88 'know':223 'lack':216 'limit':91 'list':151 'live':208 'loan':5,22,44 'loan API' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':38,110 'make':219 'maximum':73 'model':161 'network':65 'no-api-key' 'openapi':190 'page':174 'pay':2,19,117 'pay-per-cal':1,18,116 'pay-per-call' 'pay-per-request API' 'payment':50,59,100,106,160 'per':3,20,77,118,154 'platform':111 'post':54 'post-method' 'price':133,171 'prompt':181 'proof':107 'proper':211 'protocol':51 'provid':39 'quot':138 'rang':114 'rate':90,136 'readm':173 'render':176 'request':55,78,155 'request/response':193 'requir':93 'resourc':45 'respons':230 'return':57,204,209 'schema':191 'send':227 'sentiment':126 'settl':12,29,61 'simpli':95 'span':121 'spars':167 'specif':43 'summar':128 'technic':185 'token':137 'unit':82 'usdc':14,31,67 'usdc-settlement' 'use':66 'util':143 'valid':104,145 'via':10,27,47 'wallet':180 'x':99 'x-payment':98 'x402':11,28,49,105,159 'x402 loan endpoint' 'x402-payment'","prices":[{"id":"9e589a1a-40e1-41aa-8bd1-cbe23d1481ec","listingId":"94709016-32ed-4135-9166-d9cd329ca1fe","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:54.273Z"}],"sources":[{"listingId":"94709016-32ed-4135-9166-d9cd329ca1fe","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:54.273Z","lastSeenAt":"2026-04-28T10:33:35.475Z"}],"details":{"listingId":"94709016-32ed-4135-9166-d9cd329ca1fe","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/59 \\\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":"Endpoint returns a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/59"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/59"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving loan data on a per-request payment basis without needing an API key","Integrating pay-per-call financial data into agent workflows settled on Base L2","Programmatic access to loan information with USDC micropayments"],"bestFor":["Agents or applications that need on-demand loan data without subscription commitments","Developers experimenting with x402 pay-per-call protocols on Base","Low-volume consumers who prefer per-request pricing over monthly plans"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.365Z"},"updatedAt":"2026-04-28T10:33:35.475Z"}}