{"id":"cefb3cbd-3fe8-46ff-9131-bcd72f477695","shortId":"jbmYKz","kind":"x402","title":"Pay-per-call loan data API on Base, settled in USDC via x402 protocol.","tagline":"Pay-per-call loan data API on Base, settled in USDC via x402 protocol.","description":"This endpoint at lowpaymentfee.com provides access to a specific loan resource (`/api/v1/loans/56`) via the x402 payment protocol. The endpoint accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of $0.02 per request (20,000 base units at 6 decimals).\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 no API keys, no rate limits, and no minimum commitments. However, the specific `/api/v1/loans/56` endpoint is not listed on the homepage catalog, and no documentation describes its request or response schema. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no OpenAPI spec, no request/response schema documentation, and no description of what loan data is returned, the actual functionality of this endpoint remains unclear. It is confirmed live (402 challenge captured), but consumers should be aware that the endpoint's behavior is undocumented beyond the x402 payment challenge metadata.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","loan-data","json-response","post-method"],"categories":["finance","data"],"synonyms":["loan API","loan data endpoint","x402 loan","USDC micropayment API","Base network API","pay-per-request loan","lowpaymentfee"],"warnings":["No request or response schema documented anywhere","The /api/v1/loans/56 endpoint is not listed in the provider's own homepage catalog","All documentation pages (docs, API, pricing, README) returned only a 'Connect wallet' prompt with no content","Unclear what data the loan endpoint actually returns","Single hardcoded loan ID (56) — unclear if other IDs are supported"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/56","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/56","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request parameters, response schema, or what loan data is actually returned. The docs/pricing/README pages are empty. The specific /loans/56 path isn't even listed on the homepage catalog, making this effectively a stub 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'0.02':73,128 '000':77 '0x8335':66 '20':76 '2913':67 '402':213 '6':81 'Base network API' 'USDC micropayment API' 'accept':50 'access':36 'actual':202 'advertis':87 'ai/ml':99 'analysi':102 'analyt':98 'api':7,22,95,133,166 'awar':220 'base':9,24,61,78 'base-network' 'behavior':225 'beyond':228 'broader':84 'call':4,19,94 'captur':215 'catalog':153 'challeng':214,232 'classif':104 'commit':141 'confirm':211 'connect':175 'consum':217 'content':181 'contract':65 'convers':121 'cost':71 'crawl':164 'data':6,21,97,107,198 'decim':82 'describ':157 'descript':194 'doc':165 'document':156,191 'embed':105 'endpoint':32,49,124,146,206,223 'estim':115 'exchang':110 'feed':109 'finance/web3':106 'function':203 'gas':114 'generat':122 'geocod':119 'homepag':152 'howev':142 'infer':100 'infrastructur':117 'json':55 'json-response' 'key':134 'limit':137 'list':126,149 'live':212 'loan':5,20,40,197 'loan API' 'loan data endpoint' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':34,85 'maximum':70 'metadata':233 'minimum':140 'network':62 'openapi':186 'page':170 'pay':2,17,92 'pay-per-cal':1,16,91 'pay-per-call' 'pay-per-request loan' 'payment':46,56,231 'per':3,18,74,93,129 'platform':86 'post':51 'post-method' 'price':108,167 'prompt':177 'protocol':15,30,47 'provid':35 'quot':113 'rang':89 'rate':111,136 'readm':169 'remain':207 'request':52,75,130,159 'request/response':189 'resourc':41 'respons':161 'return':54,172,200 'schema':162,190 'sentiment':101 'settl':10,25,58 'span':96 'spec':187 'specif':39,144 'substant':180 'summar':103 'token':112 'unclear':208 'undocu':227 'unit':79 'usdc':12,27,64 'usdc-settlement' 'use':63 'util':118 'valid':120 'via':13,28,43 'wallet':176 'x402':14,29,45,230 'x402 loan' 'x402-payment'","prices":[{"id":"a4ec6460-85f4-4aa8-a3de-8bf9a88adbb6","listingId":"cefb3cbd-3fe8-46ff-9131-bcd72f477695","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/56","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:53.081Z"}],"sources":[{"listingId":"cefb3cbd-3fe8-46ff-9131-bcd72f477695","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/56","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:53.081Z","lastSeenAt":"2026-04-28T11:33:36.442Z"}],"details":{"listingId":"cefb3cbd-3fe8-46ff-9131-bcd72f477695","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/56 \\\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 advertising USDC on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/loans/56"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/56"}],"useCases":["Retrieving loan record data for loan ID 56 via a single paid API call","Integrating pay-per-call loan data into agent workflows without API key management","Programmatic access to financial loan information settled on Base L2"],"bestFor":["Agents needing on-demand loan data without subscription commitments","Developers experimenting with x402 pay-per-call protocols","Workflows requiring keyless, instant-access financial data endpoints"],"notFor":["Bulk loan data retrieval (no documented batch endpoints)","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.413Z"},"updatedAt":"2026-04-28T11:33:36.442Z"}}