{"id":"e0edae1d-fb61-4428-9cf6-69f16e0b3a4e","shortId":"beCh77","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, and infrastructure utilities. 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/charges/251` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals). The x402 challenge confirms the endpoint is live, accepts the `exact` payment scheme on Base, and responds with `application/json`. The payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown. Without documentation or OpenAPI specs, it is unclear what input parameters each endpoint expects or what response structures they return.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","no-api-key","no-rate-limits"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/API pages return only 'Connect wallet'","The specific functionality of /api/v1/charges/251 ('Premium API Access') is undocumented and unclear","Request and response formats are entirely unknown; no examples exist in crawled material","The platform lists many endpoints on its landing page but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/251","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/charges/251","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 confirms pricing and payment details, but there is no OpenAPI spec, no documentation, no request/response schema, and no examples. All doc pages beyond the landing page are empty ('Connect wallet'). The purpose of this specific endpoint (/api/v1/charges/251) is unclear beyond the generic label 'Premium API 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'/request':13,28 '0.02':12,27,62,113,180 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '20':106 '300':147 '6':117 'Base network API' 'USDC micropayment API' 'accept':127 'access':100 'across':45 'actual':202 'address':143 'advertis':153 'ai/ml':48 'analysi':157 'analyt':47 'api':5,20,37,72,99 'application/json':137 'attach':82 'base':8,23,69,108,133 'base-network' 'beyond':185 'broader':151 'call':4,19 'caller':80 'challeng':121 'classif':160 'confirm':122 'connect':198 'convers':172 'crypto-paid API' 'data':46,174 'decim':118 'direct':141 'document':184,211 'embed':161 'empti':191 'enabl':36 'endpoint':44,55,92,124,154,207,222 'essenti':190 'estim':169 'exact':129 'exchang':164 'expect':223 'feed':163 'finance/web3':50 'gas':168 'generat':175 'geocod':170 'header':86 'howev':183 'i.e':112 'individu':206 'infer':49 'infrastructur':52 'input':219 'json-response' 'key':73 'land':187 'limit':75 'list':96 'live':126 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':104 'network':9,24,70 'no-api-key' 'no-rate-limits' 'offer':40 'openapi':213 'page':188,195 'paramet':220 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85,130,139 'per':3,18,59 'platform':6,21,38,152 'point':182 'premium':98 'premium API access' 'price':162,181 'quot':167 'rate':74,165 'request':60,89 'request/response':203 'requir':79,102 'respond':135 'respons':226 'return':229 'schema':204 'scheme':131 'second':148 'sentiment':156 'settl':64 'show':197 'simpli':81 'sinc':114 'spec':214 'specif':91 'structur':227 'sub':194 'sub-pag':193 'subscript':77 'summar':159 'text':158 'timeout':149 'token':166 'unclear':217 'unit':109 'unknown':209 'usdc':15,30,66,111,115 'usdc-settlement' 'use':116 'util':53 'valid':171 'varieti':42 'via':10,25 'wallet':199 'without':210 'x402':11,26,35,84,120 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"2f4b2413-06bc-4068-857b-8ece0ebaeef9","listingId":"e0edae1d-fb61-4428-9cf6-69f16e0b3a4e","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/charges/251","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:50.836Z"}],"sources":[{"listingId":"e0edae1d-fb61-4428-9cf6-69f16e0b3a4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/251","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:50.836Z","lastSeenAt":"2026-04-24T15:02:24.782Z"}],"details":{"listingId":"e0edae1d-fb61-4428-9cf6-69f16e0b3a4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/251 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/251"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment directed to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/251"}],"useCases":["Accessing miscellaneous API services (analytics, AI, finance, utilities) without needing API keys or subscriptions","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-request endpoints into agent workflows via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation and well-defined schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.284Z"},"updatedAt":"2026-04-24T15:02:24.782Z"}}