{"id":"557847ee-e6e9-47a4-991f-7fbe9677e053","shortId":"CM2J5W","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/accounts/22` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). Documentation pages exist at /docs, /pricing, and /api but currently render only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","data","ai","finance"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no useful content","The specific purpose and expected input/output of /api/v1/accounts/22 is undocumented","The platform lists many endpoint categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/22","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/accounts/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/api pages are empty stubs showing only 'Connect wallet'. The purpose of the specific /api/v1/accounts/22 endpoint beyond 'Premium API Access' is 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'/api/v1/accounts/22':95 '/docs':190 '/pricing':191 '/request':13,28 '0.02':12,27,63,122 '000':111 '0x8335':116 '20':110 '2913':117 '300':135 '402':105 '6':126 'Base network API' 'USDC API' 'accept':140 'access':101 'across':151 'actual':208 'advertis':149 'ai':161 'ai/ml':48 'analysi':165 'analyt':47,155 'api':5,20,37,73,100 'application/json':145 'attach':83 'base':8,23,70,112,119 'base-network' 'broader':147 'call':4,19 'caller':81 'categori':153 'challeng':106 'classif':168 'connect':199 'content':205 'convers':184 'current':195 'data':46,51,154,158 'decim':127 'document':186 'embed':169 'enabl':36 'endpoint':44,56,93,139,150,213 'equal':121 'estim':179 'exact':132 'exchang':174 'exist':188 'export':159 'feed':173 'financ':170 'finance/web3':50 'four':152 'gas':178 'generat':185 'geocod':182 'given':123 'header':87 'individu':212 'infer':49 'infrastructur':181 'insight':160 'json-response' 'key':74 'learn':163 'limit':76 'list':97 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':162 'metric':156 'micropayment API' 'network':9,24,71 'no-api-key' 'offer':40 'page':187 'pay':2,17,59 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':58 'payment':86,129 'per':3,18,60 'platform':6,21,38,148 'post':141 'post-method' 'premium':99 'price':172 'prompt':201 'quot':177 'rate':75,175 'render':196 'report':157 'request':61,90,107,142 'request/response':209 'requir':80 'return':103,144 'schema':210 'scheme':130 'second':136 'sentiment':164 'servic':54 'settl':65 'simpli':82 'span':45 'specif':92 'subscript':78 'substant':204 'summar':167 'text':166 'timeout':137 'token':176 'unit':113 'unknown':215 'usdc':15,30,67,115,124 'usdc-settlement' 'util':53 'valid':183 'varieti':42 'via':10,25 'wallet':200 'web3':171 'x402':11,26,35,85 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"0f30e7f9-4869-4eac-9b7d-c93e4ebbc7e8","listingId":"557847ee-e6e9-47a4-991f-7fbe9677e053","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/accounts/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:39:23.308Z"}],"sources":[{"listingId":"557847ee-e6e9-47a4-991f-7fbe9677e053","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:39:23.308Z","lastSeenAt":"2026-04-22T19:30:55.863Z"}],"details":{"listingId":"557847ee-e6e9-47a4-991f-7fbe9677e053","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/accounts/22 \\\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 requesting 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/22"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/accounts/22"},{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls from autonomous agents using x402 protocol","Paying per request for analytics, AI inference, or financial data with USDC on Base"],"bestFor":["Developers or agents wanting frictionless pay-per-call API access","x402-compatible clients that can settle USDC on Base","Use cases requiring no subscription commitment or rate-limit constraints"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:39.071Z"},"updatedAt":"2026-04-22T19:30:55.863Z"}}