{"id":"19b8340a-cc13-4920-9633-18a5732d1231","shortId":"cYXSpA","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 across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/customers/36` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to the provider's wallet on Base with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including 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/request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented. The specific functionality of the `/api/v1/customers/36` endpoint is unclear from available materials — the name \"Premium API Access\" is generic and no input/output schema details are provided beyond the x402 challenge metadata.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","no-api-key","post-endpoint","json-response"],"categories":["api-platform","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["The specific functionality of /api/v1/customers/36 ('Premium API Access') is undocumented — it is unclear what data or service it provides.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No input or output schema is available for any endpoint on this platform.","The broad catalog of endpoints (AI, finance, analytics, utils) is advertised but none have verifiable documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/36","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation, no input/output schema, and the purpose of the specific /api/v1/customers/36 endpoint is entirely opaque. Docs pages all returned only 'Connect wallet' with no 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'/request':13,28,173 '0.02':12,27,114,172 '000':103 '0x8335':108 '20':102 '2913':109 '300':139 '6':119 'accept':91 'access':89,220 'across':45 'actual':194 'addit':146 'advertis':145 'ai/ml':48 'analysi':150 'analyt':47 'api':5,20,37,70,88,219 'avail':214 'base':8,23,66,104,111,136 'base network api' 'behavior':195 'beyond':230 'broader':143 'call':4,19 'challeng':96,233 'classif':153 'commit':77 'connect':185 'content':191 'convers':165 'cost':100 'data':46,51 'decim':120 'detail':227 'doc':179 'document':177 'embed':154 'enabl':36 'endpoint':44,56,81,147,201,210 'equal':113 'estim':162 'exact':127 'exchang':157 'feed':156 'finance/web3':50 'function':206 'gas':161 'generat':167 'generic':222 'geocod':163 'howev':176 'includ':148 'indic':97 'infer':49 'infrastructur':53 'input/output':225 'json-response' 'key':71 'limit':74 'list':85 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'made':123 'materi':215 'maximum':99 'metadata':234 'micropayment api' 'name':217 'network':9,24,67 'no-api-key' 'offer':40 'page':178 'paid':58 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'payment':121 'per':3,18,60,115 'per-request':59 'per-request-billing' 'platform':6,21,38,144 'point':175 'post':92 'post-endpoint' 'premium':87,218 'price':155,174,180 'prompt':187 'provid':132,229 'quot':160 'rate':73,158 'readm':181 'remain':202 'request':61,93,116 'requir':78 'respons':197 'return':182 'schema':198,226 'scheme':128 'second':140 'sentiment':149 'settl':129 'specif':80,205 'substant':190 'summar':152 'text':151 'timeout':141 'token':159 'unclear':212 'undocu':203 'unit':105 'usdc':15,30,63,107,117 'usdc api' 'usdc-base-network' 'use':62,118 'util':54 'valid':164 'varieti':42 'via':10,25,124 'wallet':134,186 'x402':11,26,35,95,126,232 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e55468ff-7cf8-4d6b-850d-5520348c81e9","listingId":"19b8340a-cc13-4920-9633-18a5732d1231","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/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:42.090Z"}],"sources":[{"listingId":"19b8340a-cc13-4920-9633-18a5732d1231","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:42.090Z","lastSeenAt":"2026-04-24T23:02:33.104Z"}],"details":{"listingId":"19b8340a-cc13-4920-9633-18a5732d1231","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/customers/36 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/customers/36"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/customers/36"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or response schema guarantees before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:44.17Z"},"updatedAt":"2026-04-24T23:02:33.104Z"}}