{"id":"11e5a0b6-4caf-4b06-8344-d251f41e0ba4","shortId":"BgrCKD","kind":"x402","title":"x402-payable loan data endpoint on Base, settled in USDC at $0.02 per request.","tagline":"x402-payable loan data endpoint on Base, settled in USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides premium API access to a specific loan resource (`/api/v1/loans/39`) via the x402 payment protocol. It is live and returns a 402 challenge requiring payment in USDC on the Base network. The price per request is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. Payment is made via the x402 \"exact\" scheme with no API keys, rate limits, or upfront commitments required.\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-payable endpoints spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all priced at $0.02 per request. However, this specific endpoint (`/api/v1/loans/39`) is not listed on the site's landing page catalog, and its exact response payload is undocumented. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation across the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The purpose of the `/loans/39` resource (whether it returns loan details, amortization schedules, or something else) cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","json-response","http-post","per-request-pricing","no-api-key"],"categories":["finance","data"],"synonyms":["loan API","loan data endpoint","x402 loan","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The /api/v1/loans/39 endpoint is not listed in the provider's own catalog of available APIs","No documentation exists — docs, API, pricing, and README pages all show only 'Connect wallet'","No request body schema or response schema is available; the endpoint's actual output is unknown","No OpenAPI or machine-readable spec is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/39","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and the specific /loans/39 resource is not even listed on the provider's own landing page. The purpose and output of this endpoint are entirely 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'/loans/39':219 '0.02':13,28,81,144 '000':72 '20':71 '402':56 '6':77 'Base network API' 'USDC pay-per-call' 'accept':171 'access':38 'across':178 'ai/ml':117 'amort':226 'analysi':120 'analyt':116 'api':37,93,186 'application/json':176 'avail':214,236 'base':8,23,64,73 'base-network' 'broad':107 'cannot':231 'catalog':108,161 'challeng':57 'classif':122 'commit':99 'connect':195 'content':201 'convers':139 'crypto-paid API' 'data':5,20,115 'decim':78 'detail':225 'determin':233 'doc':185 'document':177 'els':230 'embed':123 'endpoint':6,21,32,113,150,170 'equal':80 'estim':133 'exact':89,164 'exampl':213 'exchang':128 'extrem':182 'feed':127 'financ':124 'gas':132 'generat':140 'geocod':137 'host':102 'howev':147 'http':172 'http-post' 'infer':118 'infrastructur':135 'json-response' 'key':94 'land':159 'limit':96 'list':154 'live':52 'loan':4,19,42,224 'loan API' 'loan data endpoint' 'lowpaymentfee' 'lowpaymentfee.com':34,104 'made':85 'materi':237 'network':65 'no-api-key' 'offer':105 'openapi':205 'page':160,190 'payabl':3,18,112 'payload':166 'payment':48,59,83 'per':14,29,68,145 'per-request-pricing' 'post':173 'premium':36 'premium API access' 'price':67,126,142,187 'prompt':197 'protocol':49 'provid':35 'purpos':216 'quot':131 'rate':95,129 'readm':189 'render':192 'request':15,30,69,146 'request/response':208 'requir':58,100 'resourc':43,220 'respons':165 'return':54,175,223 'schedul':227 'schema':209 'scheme':90 'sentiment':119 'settl':9,24 'site':103,157,180 'someth':229 'span':114 'spec':206 'specif':41,149 'summar':121 'thin':183 'token':130 'undocu':168 'unit':74 'upfront':98 'usag':212 'usd':82 'usdc':11,26,61,76 'usdc-settlement' 'util':136 'valid':138 'via':45,86 'wallet':196 'web3':125 'whether':221 'x402':2,17,47,88,111 'x402 loan' 'x402-payable':1,16,110 'x402-payment'","prices":[{"id":"f63c8f98-c2c9-4cdf-a8b6-08c5cc612254","listingId":"11e5a0b6-4caf-4b06-8344-d251f41e0ba4","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/39","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:34.986Z"}],"sources":[{"listingId":"11e5a0b6-4caf-4b06-8344-d251f41e0ba4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/39","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:34.986Z","lastSeenAt":"2026-04-28T13:04:13.327Z"}],"details":{"listingId":"11e5a0b6-4caf-4b06-8344-d251f41e0ba4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/39 \\\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 402 challenge requiring 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/loans/39"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/39"},{"claim":"The site advertises $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/loans/39 endpoint is not listed among the site's available APIs","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving loan data or details for resource ID 39 via a single paid API call","Integrating pay-per-request loan information into agent workflows without API key management","Programmatic access to financial loan data settled on-chain via USDC on Base"],"bestFor":["Agents or applications that need on-demand loan data without subscription commitments","Developers experimenting with x402 payment protocol integrations","Workflows requiring keyless, pay-as-you-go API access on Base"],"notFor":["Users who need documented request/response schemas before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone needing loan data for resources other than ID 39 (this endpoint is resource-specific)"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:15.254Z"},"updatedAt":"2026-04-28T13:04:13.327Z"}}