{"id":"788c847f-b356-4a06-816a-0d66536f4bc6","shortId":"SdmEzD","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 loan resource (ID 20) 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 utility services — all gated behind x402 challenges on the Base network using USDC.\n\nThe specific endpoint `/api/v1/loans/20` returns JSON data when a valid x402 payment header is supplied. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). This is consistent with the platform's stated flat pricing of $0.02 per request across all endpoints. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises no API keys, no rate limits, and instant access. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what loan data fields are returned. The endpoint is confirmed live (402 challenge captured), but the actual data payload and its usefulness remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","loan-data","json-response","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","loan data endpoint","x402 loan","pay-per-call loan","Base USDC API","lowpaymentfee","micro-payment API"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response fields for the loans endpoint","Unknown response payload — it is unclear what loan data fields are returned","The endpoint path '/api/v1/loans/20' is not listed on the platform's own homepage API catalog, which raises questions about its provenance"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/20","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/20","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, but there is no documentation, no OpenAPI schema, no request/response examples, and no description of what data the loan endpoint actually returns. The docs pages are all empty 'Connect wallet' stubs. This is effectively a stub 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'0.02':119,137 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':148 '0x8335':113 '20':40,107 '2913':114 '300':151 '402':212 '6':124 'Base USDC API' 'access':34,165 'across':140 'actual':217 'address':147 'advertis':102,156 'ai/ml':66 'analyt':65 'api':62,158,173 'base':8,22,80,109,116 'behind':75 'broader':51 'call':61 'captur':214 'challeng':77,101,213 'confirm':210 'connect':182 'consist':128 'content':188 'cost':105 'data':5,19,64,69,90,203,218 'decim':125 'descript':199 'doc':172 'document':167 'endpoint':6,20,30,86,142,208 'equal':118 'exampl':196 'extrem':169 'field':204 'finance/web3':68 'flat':134 'gate':3,17,74 'header':96 'howev':166 'id':39 'infer':67 'instant':164 'json':89 'json-response' 'key':159 'limit':162 'live':211 'loan':4,18,37,202 'loan API' 'loan data endpoint' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':104 'micro-payment API' 'network':81 'no-api-key' 'offer':54 'openapi':192 'page':177 'part':48 'pay':10,24,59 'pay-per-cal':58 'pay-per-call loan' 'pay-per-request':9,23 'payload':219 'payment':44,95,143 'per':11,25,60,120,138 'platform':52,131,155 'price':135,174 'prompt':184 'protocol':45 'provid':33 'rate':161 'readm':176 'remain':223 'render':179 'request':12,26,121,139 'request/response':195 'resourc':38 'return':88,206 'schema':193 'second':152 'sent':145 'servic':72 'span':63 'spars':170 'specif':85 'state':133 'substant':187 'suppli':98 'timeout':153 'unit':110 'unknown':224 'usdc':14,28,83,112,122 'usdc-base' 'use':82,123,222 'util':71 'valid':93 'varieti':56 'via':41 'wallet':183 'x402':2,16,43,76,94,100 'x402 loan' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"257e1d9b-badb-42c2-98ab-1796f58da073","listingId":"788c847f-b356-4a06-816a-0d66536f4bc6","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:20.404Z"}],"sources":[{"listingId":"788c847f-b356-4a06-816a-0d66536f4bc6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:20.404Z","lastSeenAt":"2026-04-28T14:35:03.077Z"}],"details":{"listingId":"788c847f-b356-4a06-816a-0d66536f4bc6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/20 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/20"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/loans/20"}],"useCases":["Retrieving loan record data on a per-request payment basis","Integrating loan information into agent workflows without API key management","Programmatic access to financial loan data via crypto micropayments"],"bestFor":["Agents or developers who want keyless, pay-per-call access to loan data","Users already holding USDC on Base who want frictionless API access","Prototyping integrations that need loan data without subscription commitments"],"notFor":["Users who need detailed documentation or schema guarantees before integrating","Bulk data retrieval where per-request pricing would be cost-prohibitive","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.956Z"},"updatedAt":"2026-04-28T14:35:03.077Z"}}