{"id":"4d218ab2-b07a-42e2-a19b-0816214d4f10","shortId":"ks2WSw","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 (loan ID 13) 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 amount of 20,000 base units, which equals $0.02 USD (USDC uses 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 endpoint is part of a broader platform (lowpaymentfee.com) that offers multiple pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services, all priced at $0.02 per request. However, this specific endpoint (/api/v1/loans/13) is not listed on the site's main catalog and its exact response schema is undocumented. The title \"Premium API Access\" is generic and does not clarify what loan data is returned.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no example request/response, and no description of the loan data model. Prospective callers should be aware that the actual payload and data quality are unknown without making a paid request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","loan-data","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","loan data service"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/loans/13 path is not listed in the provider's public API catalog — purpose unclear","All documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt with no content","Response format and loan data model are completely undocumented","The generic title 'Premium API Access' provides no information about what this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/13","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no example request/response, and the specific resource (loans/13) is not even listed on the provider's own catalog. The purpose and schema of the returned data are entirely 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'/api/v1/loans/13':148 '/docs':186 '/pricing':187 '/readme':190 '/request':17,34 '0.02':16,33,83,141 '000':78 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':71 '13':48 '20':77 '6':87 'Base network API' 'USDC micropayment API' 'accept':55 'access':40,169 'actual':226 'ai/ml':131 'amount':75 'analyt':130 'api':90,127,168 'attach':99 'awar':223 'base':9,26,66,79 'base-network' 'broader':117 'call':4,21,126 'caller':97,220 'catalog':157 'clarifi':175 'connect':196 'content':202 'contract':70 'data':6,23,129,134,178,217,229 'decim':88 'descript':213 'document':181 'endpoint':7,24,36,112,147 'equal':82 'exact':160 'exampl':209 'extrem':183 'finance/web3':133 'generic':171 'header':104 'howev':144 'id':47 'infer':132 'json':60 'json-response' 'key':91 'limit':94 'list':151 'loan':5,22,44,46,177,216 'loan API' 'loan data service' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':38,119 'main':156 'make':234 'maximum':74 'model':218 'multipl':122 'network':67 'no-api-key' 'offer':121 'openapi':206 'page':191 'paid':236 'part':114 'pay':2,19,124 'pay-per-cal':1,18,123 'pay-per-call' 'pay-per-request API' 'payload':227 'payment':52,61,103,109 'per':3,20,125,142 'platform':118 'post':56 'premium':167 'price':139 'prompt':198 'proof':110 'prospect':219 'protocol':53 'provid':39 'qualiti':230 'rate':93 'render':193 'request':57,143,237 'request/response':210 'requir':96 'resourc':45 'respons':161 'return':59,180 'schema':162 'servic':137 'settl':12,29,63 'simpli':98 'site':154 'span':128 'spars':184 'spec':207 'specif':43,146 'substant':201 'titl':166 'undocu':164 'unit':80 'unknown':232 'usd':84 'usdc':14,31,69,85 'usdc-settlement' 'use':68,86 'util':136 'valid':107 'via':10,27,49 'wallet':197 'without':233 'x':102 'x-payment':101 'x402':11,28,51,108 'x402 loan endpoint' 'x402-payment'","prices":[{"id":"8983a15a-f606-4633-9258-34131a6604aa","listingId":"4d218ab2-b07a-42e2-a19b-0816214d4f10","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:28.892Z"}],"sources":[{"listingId":"4d218ab2-b07a-42e2-a19b-0816214d4f10","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:28.892Z","lastSeenAt":"2026-04-28T13:04:13.073Z"}],"details":{"listingId":"4d218ab2-b07a-42e2-a19b-0816214d4f10","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/13 \\\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":"The endpoint returns a 402 challenge requesting 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/13"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/13"},{"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":"The /api/v1/loans/13 endpoint is not listed in the provider's public API catalog","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving loan record data for loan ID 13 via a single paid API call","Integrating pay-per-call loan data into automated agent workflows","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","Agents needing on-demand loan data without subscription commitments","Low-volume, pay-as-you-go API consumption"],"notFor":["Production use requiring documented schemas and SLAs","Bulk loan data retrieval or batch processing","Users who need free or pre-authenticated API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.604Z"},"updatedAt":"2026-04-28T13:04:13.073Z"}}