{"id":"fc26b2c3-6ff9-41db-af9c-6d02a63a5b57","shortId":"yjZJrn","kind":"x402","title":"Pay-per-request loan data API on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request loan data API on Base via x402 — $0.02/call in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com provides access to a specific loan resource (`/api/v1/loans/68`) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract `0x8335…2913`) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a range of pay-per-call APIs across categories including 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, documentation for this specific loans endpoint is essentially absent. The crawled docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no description of request parameters or response shape, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but what data it actually returns for loan ID 68 — or what POST body it expects — is unknown from the available material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","json-response","no-api-key","loan-data"],"categories":["finance","data"],"synonyms":["loan API","x402 loan endpoint","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all render only a wallet-connect prompt","No OpenAPI or schema describing request body or response format for /api/v1/loans/68","Purpose and data content of the loans endpoint is entirely unknown from available material","The endpoint path references a specific resource ID (68) with no explanation of what it represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/loans/68","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the loans/68 resource actually contains. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/call':13,32 '/request':161 '0.02':12,31,79,160 '000':83 '0x8335':73 '20':82 '2913':74 '402':218 '6':87 '68':229 'Base network API' 'USDC micropayment API' 'absent':173 'accept':57 'access':44 'account':92 'across':125 'actual':224 'advertis':116 'ai/ml':130 'analysi':133 'analyt':129 'api':7,17,26,36,90,124,177 'attach':100 'avail':240 'base':9,28,68,84 'bodi':233 'broader':113 'call':123 'caller':98 'categori':126 'challeng':219 'classif':135 'confirm':213 'connect':186 'content':192 'contract':72 'convers':151 'cost':77 'crawl':175 'crypto payment API' 'data':6,25,128,222 'decim':88 'descript':199 'doc':176 'document':165 'embed':136 'endpoint':40,154,170,211 'essenti':172 'estim':145 'exampl':209 'exchang':140 'expect':235 'feed':139 'finance/web3':137 'gas':144 'generat':152 'geocod':149 'header':105 'howev':164 'id':228 'includ':127 'infer':131 'infrastructur':147 'json':62 'json-response' 'key':18,37,91 'limit':95 'list':156 'live':214 'loan':5,24,48,169,227 'loan API' 'loan-data' 'lowpaymentfee' 'lowpaymentfee.com':42,114 'materi':241 'network':69 'no-api-key' 'openapi':196 'page':181 'paramet':202 'pay':2,21,121 'pay-per-cal':120 'pay-per-call API' 'pay-per-request':1,20 'payment':54,63,104,110 'per':3,22,80,122 'per-request-billing' 'platform':115 'point':163 'post':58,232 'price':138,162,178 'prompt':188 'proof':111 'proper':217 'protocol':55 'provid':43 'quot':143 'rang':118 'rate':94,141 'readm':180 'request':4,23,59,81,201 'requir':19,38,97 'resourc':49 'respons':204 'return':61,183,215,225 'schema':197 'sentiment':132 'settl':65 'shape':205 'simpli':99 'specif':47,168 'summar':134 'token':142 'unit':85 'unknown':237 'usag':208 'usdc':15,34,71 'usdc-base' 'use':70 'util':148 'valid':108,150 'via':10,29,51 'wallet':187 'x':103 'x-payment':102 'x402':11,30,53,109 'x402 loan endpoint' 'x402-payment'","prices":[{"id":"1fcd2943-4ea8-4638-aa36-29fecd64227c","listingId":"fc26b2c3-6ff9-41db-af9c-6d02a63a5b57","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:47:44.657Z"}],"sources":[{"listingId":"fc26b2c3-6ff9-41db-af9c-6d02a63a5b57","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/loans/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:47:44.657Z","lastSeenAt":"2026-04-28T11:33:36.167Z"}],"details":{"listingId":"fc26b2c3-6ff9-41db-af9c-6d02a63a5b57","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/loans/68 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC on Base at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/loans/68"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/loans/68"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching loan data on-demand without subscription or API key management","Agent-driven financial data retrieval with per-call USDC micropayments","Integrating loan information into Web3 applications using x402 protocol"],"bestFor":["Developers wanting zero-signup, pay-as-you-go loan data access","AI agents that can settle x402 payments on Base","Web3 applications needing on-chain payment rails for API calls"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:14.76Z"},"updatedAt":"2026-04-28T11:33:36.167Z"}}