{"id":"94e2eccd-670e-410b-b873-c659d30ac7a9","shortId":"NBv6XQ","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/customers/70` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a max amount of 20,000 base units of USDC (asset 0x8335…2913 on Base, 6 decimals), which equals $0.02. The platform also hosts endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is live (402 challenge confirmed), but the actual behavior and response format of `/api/v1/customers/70` is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["api-platform","data","llm"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The /docs, /pricing, /api, and /README pages contain no useful content — only a 'Connect wallet' prompt","The specific purpose and expected input/output of /api/v1/customers/70 ('Premium API Access') is undocumented and unclear","No request or response examples could be obtained"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/70","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/customers/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the purpose of '/api/v1/customers/70' specifically is opaque. The docs/pricing/README pages are all empty wallet-connect 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'/api/v1/customers/70':99,221 '/docs':172 '/pricing':173 '/readme':176 '/request':13,30 '0.02':12,29,63,134,164 '000':120 '0x8335':126 '20':119 '2913':127 '402':210 '6':130 'Base network API' 'USDC API' 'access':105 'actual':215 'advertis':114 'ai-inference' 'ai/ml':53 'also':137 'amount':117 'analysi':142 'analyt':52 'api':5,15,22,32,41,76,104 'application/json':108 'asset':125 'attach':87 'avail':202,225 'base':8,25,71,121,129 'behavior':216 'broad':46 'call':4,21 'caller':85 'challeng':113,211 'classif':145 'commit':84 'confirm':212 'connect':182 'content':188 'convers':157 'cost':62 'crawl':205 'crypto-data' 'data':51,56 'data-analytics' 'decim':131 'document':167,197 'embed':146 'enabl':40 'endpoint':49,61,97,139,207 'equal':133 'estim':154 'everi':60 'exampl':201 'exchang':149 'extrem':169 'feed':148 'finance-data' 'finance/web3':55 'format':219 'gas':153 'generat':159 'geocod':155 'header':91 'host':138 'infer':54 'json-api' 'key':16,33,77 'limit':80 'list':101 'live':209 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'materi':226 'max':116 'micropayment API' 'network':72 'no-api-key' 'offer':44 'openapi':192 'page':177 'paid':66 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':90 'per':3,20,64 'platform':6,23,42,136 'point':166 'post':110 'premium':103 'price':147,165 'prompt':184 'quot':152 'rate':79,150 'render':179 'request':65,94 'request/response':195 'requir':17,34 'respons':218 'return':107 'schema':196 'sentiment':141 'servic':59 'set':47 'simpli':86 'span':50 'spec':193 'specif':96 'subscript':83 'summar':144 'text':143 'thin':170 'token':151 'unclear':223 'unit':122 'usag':200 'usdc':9,26,68,124 'usdc-base' 'util':58 'utility-services' 'valid':156 'via':10,27,109 'wallet':183 'x402':11,28,39,89,112 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"55ded43c-ab48-49d2-928a-66b12cb65f83","listingId":"94e2eccd-670e-410b-b873-c659d30ac7a9","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/customers/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:57.372Z"}],"sources":[{"listingId":"94e2eccd-670e-410b-b873-c659d30ac7a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:57.372Z","lastSeenAt":"2026-04-24T03:02:42.180Z"}],"details":{"listingId":"94e2eccd-670e-410b-b873-c659d30ac7a9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/70 \\\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":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/70"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics and reports without managing API keys or subscriptions","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Fetching real-time crypto/finance data (prices, exchange rates, gas estimates) with micropayments","Using utility endpoints (geocoding, validation, conversion) without rate limits"],"bestFor":["Developers who want instant API access without signup or key management","Agent-based workflows that can attach x402 payment headers automatically","Low-volume or bursty usage patterns where per-call pricing is more economical than subscriptions"],"notFor":["High-volume production workloads where per-call costs would accumulate significantly","Users who need detailed API documentation, SDKs, or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.229Z"},"updatedAt":"2026-04-24T03:02:42.180Z"}}