{"id":"4b3e6ef4-c389-4d97-81c6-d52da9706872","shortId":"5qpNzr","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 46) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with a maximum charge of 20,000 base units (i.e., $0.02 given USDC's 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 provider, lowpaymentfee.com, hosts a broader catalog of pay-per-call APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities, all priced at $0.02 per request. However, this specific endpoint (/api/v1/loans/46) is not listed on the provider's public landing page among those categories, and no documentation beyond the generic \"Premium API Access\" label is available. The exact schema of the response (loan fields, data format) is not documented in the crawled material.\n\nBecause the endpoint returns a proper 402 challenge with well-formed x402 metadata, it is confirmed live. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, and the timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","loan-data","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","loan data endpoint","x402 loan","pay-per-request loan","USDC micropayment API","Base network API","lowpaymentfee"],"warnings":["Endpoint /api/v1/loans/46 is not listed among the provider's publicly advertised APIs — purpose and response schema are unknown","All documentation pages (docs, api, pricing, README) returned only 'Connect wallet' with no actual content","No request body schema or response schema is available; callers cannot know what fields to send or expect","The 'Premium API Access' description is generic and uninformative"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/46","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network details. However, there is no documentation on what the /api/v1/loans/46 endpoint actually returns, no request/response schema, and the endpoint is not listed on the provider's own landing page. The crawled docs/pricing/API pages all rendered only a 'Connect wallet' prompt with no useful 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'/request':17,34 '0.02':16,33,81,134 '000':77 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':206 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':70 '20':76 '300':214 '402':190 '46':47 '6':85 'Base network API' 'USDC micropayment API' 'accept':54 'access':40,163 'address':204 'ai/ml':125 'among':152 'analyt':124 'api':88,121,162 'attach':97 'avail':166 'base':9,26,65,78 'beyond':158 'broader':114 'call':4,21,120 'caller':95 'catalog':115 'categori':154 'challeng':191 'charg':74 'confirm':200 'contract':69 'crawl':182 'data':6,23,123,175 'decim':86 'document':157,179 'endpoint':7,24,36,140,186 'exact':168 'field':174 'finance/web3':127 'form':195 'format':176 'generic':160 'given':82 'header':102 'host':112 'howev':137 'i.e':80 'id':46 'infer':126 'infrastructur':129 'json':59 'json-response' 'key':89 'label':164 'land':150 'limit':92 'list':144 'live':201 'loan':5,22,44,173 'loan API' 'loan data endpoint' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':38,111 'materi':183 'maximum':73 'metadata':197 'network':66 'no-api-key' 'page':151 'pay':2,19,118 'pay-per-cal':1,18,117 'pay-per-call' 'pay-per-request loan' 'payment':51,60,101,107,203,211 'per':3,20,119,135 'post':55 'premium':161 'price':132 'proof':108 'proper':189 'protocol':52 'provid':39,110,147 'public':149 'rate':91 'record':45 'request':56,136 'requir':94 'respons':172 'return':58,187 'schema':169 'second':215 'settl':12,29,62 'settlement':212 'simpli':96 'span':122 'specif':43,139 'timeout':209 'unit':79 'usdc':14,31,68,83 'usdc-base' 'use':67 'util':130 'valid':105 'via':10,27,48 'well':194 'well-form':193 'x':100 'x-payment':99 'x402':11,28,50,106,196 'x402 loan' 'x402-payment'","prices":[{"id":"b8d4fe4e-7022-46fb-a891-c85cc3187ce6","listingId":"4b3e6ef4-c389-4d97-81c6-d52da9706872","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:32.602Z"}],"sources":[{"listingId":"4b3e6ef4-c389-4d97-81c6-d52da9706872","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:32.602Z","lastSeenAt":"2026-04-28T13:33:35.225Z"}],"details":{"listingId":"4b3e6ef4-c389-4d97-81c6-d52da9706872","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/46 \\\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":"Payment is 20,000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/loans/46"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/loans/46"}],"useCases":["Retrieving loan record details programmatically with per-call USDC micropayments","Integrating loan data into agent workflows without managing API keys","Accessing financial data on-demand with instant crypto settlement"],"bestFor":["Agents or bots needing on-demand loan data with no subscription","Developers experimenting with x402 pay-per-call protocols","Crypto-native applications that can settle payments on Base"],"notFor":["Users who need bulk loan data exports (single-record endpoint)","Applications that cannot handle USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.368Z"},"updatedAt":"2026-04-28T13:33:35.225Z"}}