{"id":"3749d44a-c611-48f1-a9f9-cc34d61efa8f","shortId":"4yF7qd","kind":"x402","title":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated loan data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific loan resource (loan ID 37) via the x402 payment protocol. The endpoint is live and returns a 402 challenge requiring payment in USDC on the Base network. The price per request is $0.02 (20,000 base units of USDC with 6 decimals). Payment is made via the x402 \"exact\" scheme to the specified wallet address, with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform advertises a range of x402-gated APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. However, this specific listing is for the `/api/v1/loans/37` endpoint, which is labeled \"Premium API Access\" and appears to serve loan-related data. No OpenAPI schema, request/response examples, or detailed documentation were found for this endpoint, so the exact input parameters and response format remain unknown.\n\nThe site's documentation, pricing, and API pages all returned minimal content (just a \"Connect wallet\" prompt), so there is very limited information about what data this endpoint actually returns or what request body it expects.","tags":[],"capabilities":["x402-payment","usdc-payment","base-network","loan-data","per-request-pricing","no-api-key","json-response"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","pay-per-request API","USDC API","Base network API","lowpaymentfee","crypto payment API","micropayment API"],"warnings":["No OpenAPI schema or endpoint documentation available","No request body schema or response format documented","The /docs, /pricing, /api, and /README pages all returned only 'Connect wallet' with no useful content","The specific purpose and data returned by /api/v1/loans/37 is unknown — 'Premium API Access' is generic","Cannot verify what loan data (if any) is actually served behind the paywall"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/37","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/37","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 no OpenAPI schema, no documentation, no request/response examples, and no description of what the loan data actually contains. The docs/pricing/API pages are all blank beyond a wallet connect prompt. This is effectively a stub 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'/request':146 '0.02':10,24,70,145 '000':72 '20':71 '37':42 '402':55 '6':78 'Base network API' 'USDC API' 'access':34,163 'actual':223 'address':92 'advertis':105 'ai':116 'analysi':120 'analyt':115 'api':95,112,162,201 'appear':165 'base':8,22,63,73 'base-network' 'bodi':228 'broader':102 'challeng':56 'classif':122 'connect':209 'content':206 'convers':139 'crypto payment API' 'data':5,19,114,171,220 'decim':79 'detail':178 'document':179,198 'embed':123 'endpoint':6,20,30,49,157,184,222 'estim':133 'exact':86,187 'exampl':176 'exchang':128 'expect':230 'feed':127 'financ':124 'format':192 'found':181 'gas':132 'gate':3,17,111 'generat':140 'geocod':137 'howev':149 'id':41 'inform':217 'infrastructur':135 'input':188 'json-response' 'key':96 'label':160 'learn':118 'limit':99,216 'list':152 'live':51 'loan':4,18,38,40,169 'loan API' 'loan-data' 'loan-rel':168 'lowpaymentfee' 'lowpaymentfee.com':32,103 'machin':117 'made':82 'micropayment API' 'minim':205 'network':64 'no-api-key' 'openapi':173 'page':202 'paramet':189 'pay':9,23 'pay-per-request API' 'payment':46,58,80 'per':11,25,67 'per-request-pricing' 'platform':104 'point':148 'premium':161 'price':66,126,147,199 'prompt':211 'protocol':47 'provid':33 'quot':131 'rang':107 'rate':98,129 'relat':170 'remain':193 'request':12,26,68,227 'request/response':175 'requir':57,100 'resourc':39 'respons':191 'return':53,204,224 'schema':174 'scheme':87 'sentiment':119 'serv':167 'site':196 'span':113 'specif':37,151 'specifi':90 'summar':121 'token':130 'unit':74 'unknown':194 'usdc':14,28,60,76 'usdc-payment' 'util':136 'valid':138 'via':43,83 'wallet':91,210 'web3':125 'x402':2,16,45,85,110 'x402 loan endpoint' 'x402-gated':1,15,109 'x402-payment'","prices":[{"id":"91e3810f-2faa-4583-9561-283f159099a6","listingId":"3749d44a-c611-48f1-a9f9-cc34d61efa8f","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/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:37.415Z"}],"sources":[{"listingId":"3749d44a-c611-48f1-a9f9-cc34d61efa8f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:37.415Z","lastSeenAt":"2026-04-28T13:33:35.390Z"}],"details":{"listingId":"3749d44a-c611-48f1-a9f9-cc34d61efa8f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/37 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/37"},{"claim":"Price is $0.02 per request across all listed APIs","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/37"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching loan data for a specific loan record on-demand","Integrating pay-per-call loan information into agent workflows","Accessing financial data without API key registration"],"bestFor":["Agents that need on-demand loan data with no signup","Developers experimenting with x402 payment protocol","Micropayment-based data access without subscriptions"],"notFor":["Bulk loan data retrieval (no documented batch endpoints)","Users who need detailed API documentation before integrating","Non-crypto users who cannot pay in USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.129Z"},"updatedAt":"2026-04-28T13:33:35.390Z"}}