{"id":"c4e3fa4a-ab0f-44ae-8d40-9f81700ab9d9","shortId":"vapNR8","kind":"x402","title":"x402-gated loan data endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated loan data endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a specific loan resource (loan ID 29) via the x402 payment protocol. It is part of a broader platform that offers a variety of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/loans/29` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (asset 0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). The platform's landing page confirms a flat $0.02/request pricing model across all endpoints, with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what request body the POST expects or what the response payload looks like. The loan-specific path (`/loans/29`) suggests it may return details about a particular loan record, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","loan-data","post-endpoint"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","micropayment API","USDC API","Base network API","pay-per-call loan data","lowpaymentfee"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific resource '/api/v1/loans/29' is not listed on the landing page among advertised APIs — its purpose is unclear","Cannot verify what data is returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/29","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/29","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 challenge with clear pricing, but there is zero documentation on request format, response schema, or what 'loan 29' actually contains. No OpenAPI spec, no examples, and all doc pages render only a wallet connect prompt. Effectively a stub 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'/api/v1/loans/29':90 '/docs':160 '/loans/29':225 '/pricing':162 '/readme':164 '/request':137 '0.02':121,136 '000':109 '0x8335':115 '20':108 '29':42 '2913':116 '402':199 '6':126 'Base network API' 'USDC API' 'accept':97 'access':34,95 'across':140 'advertis':103 'ai/ml':68 'analyt':67 'api':64,94,145 'asset':114 'avail':191 'base':8,22,85,110,118 'base-network' 'behind':77 'bodi':209 'broader':53 'call':63 'challeng':102,200 'commit':153 'confirm':133 'connect':170 'cost':106 'data':5,19,66,71 'decim':127 'detail':177,230 'document':155,186,203 'endpoint':6,20,30,89,142,193 'equal':120 'exampl':189 'expect':212 'extrem':157 'finance/web3':70 'flat':135 'gate':3,17,76 'id':41 'infer':69 'infrastructur':73 'key':146 'label':92 'land':131 'like':219 'limit':149 'live':195 'loan':4,18,38,40,222,234 'loan API' 'loan-data' 'loan-specif':221 'look':218 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':105 'may':228 'micropay':79 'micropayment API' 'minimum':152 'model':139 'network':86 'offer':56 'openapi':181 'page':132,165 'part':50 'particular':233 'path':224 'pay':10,24,61 'pay-per-cal':60 'pay-per-call loan data' 'pay-per-request':9,23 'payload':190,217 'payment':46 'per':11,25,62,122 'platform':54,129 'post':98,211 'post-endpoint' 'premium':93 'price':138 'prompt':172 'protocol':47 'provid':33 'rate':148 'record':235 'render':167 'request':12,26,99,123,208 'request/response':184 'requir':154 'resourc':39 'respons':216 'return':196,229 'schema':185 'settl':80 'span':65 'spars':158 'spec':182 'specif':37,88,223 'specul':239 'suggest':226 'technic':176 'unclear':206 'unit':111 'usdc':14,28,82,113,124 'usdc-settlement' 'use':125 'util':74 'valid':198 'varieti':58 'via':43 'wallet':171 'without':202 'x402':2,16,45,78,101 'x402 loan endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"da886b54-1c85-488d-a99a-63d28cbb94c3","listingId":"c4e3fa4a-ab0f-44ae-8d40-9f81700ab9d9","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:22.197Z"}],"sources":[{"listingId":"c4e3fa4a-ab0f-44ae-8d40-9f81700ab9d9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:22.197Z","lastSeenAt":"2026-04-28T14:35:03.166Z"}],"details":{"listingId":"c4e3fa4a-ab0f-44ae-8d40-9f81700ab9d9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/29 \\\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":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/29"},{"claim":"Platform pricing is $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 address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/loans/29"}],"useCases":["Retrieving loan record details via a single micropayment","Programmatic access to loan data without API key registration","Agent-driven financial data retrieval with on-chain settlement"],"bestFor":["Developers wanting keyless, pay-per-call access to loan data","AI agents that can settle x402 payments in USDC on Base","Prototyping micropayment-gated data access patterns"],"notFor":["Production use requiring documented request/response schemas","Bulk loan data retrieval (no batch endpoint documented)","Users who need fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.871Z"},"updatedAt":"2026-04-28T14:35:03.166Z"}}