{"id":"3720c57b-e00f-48c1-b372-4acb7365393d","shortId":"vTUMza","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/90` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers attach an X-PAYMENT header with a signed USDC payment to each request.\n\nThe wider platform advertises four endpoint 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The platform claims no rate limits, no minimums, and instant access.\n\nThis particular endpoint (`/api/v1/keys/90`) is labeled generically as \"Premium API Access\" and does not appear in the main catalog listing on the homepage. Its exact functionality is unclear — it may be a key-generation or key-management endpoint, or simply a generic premium tier access point. The endpoint is confirmed live, returning a valid x402 402 challenge on POST. No OpenAPI schema, request/response examples, or detailed documentation were found beyond the homepage catalog.","tags":[],"capabilities":["x402-payment","usdc-base-settlement","pay-per-request","no-api-key-required","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["The exact functionality of /api/v1/keys/90 is undocumented — it does not appear in the homepage catalog","No OpenAPI spec, request schema, or response schema is available","No detailed documentation pages were accessible (pricing, README, and /api pages all returned only a 'Connect wallet' prompt)","The platform's claims (no rate limits, instant access) are unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/90","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/keys/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/keys/90 actually returns. The homepage lists other endpoints but not this one. Functionality must be guessed from the path name 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'/request':19,38,170 '0.02':18,37,80,169 '000':84 '20':83 '402':241 '6':90 'Base network API' 'USDC API' 'access':75,183,194,230 'account':102 'advertis':125 'ai':12,31,136 'ai-inference' 'analysi':140 'analyt':130 'api':5,24,45,74,100,193 'appear':198 'attach':108 'base':8,27,63,85 'beyond':255 'broad':50 'call':4,23,82 'caller':107 'catalog':51,202,258 'categori':128 'challeng':242 'claim':175 'classif':143 'confirm':235 'convers':160 'cost':77 'data':11,30,129,133 'data-analytics' 'decim':91 'detail':251 'document':252 'embed':144 'enabl':44 'endpoint':16,35,57,67,127,163,186,223,233 'estim':154 'exact':208 'exampl':249 'exchang':149 'export':134 'feed':148 'financ':13,32,145 'finance-data' 'found':254 'four':126 'function':209 'gas':153 'generat':161,218 'generic':190,227 'geocod':158 'handl':94 'header':113 'homepag':206,257 'infrastructur':156 'insight':135 'instant':182 'key':101,217,221 'key-gener':216 'key-manag':220 'label':189 'learn':138 'limit':178 'list':71,165,203 'live':236 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':137 'main':201 'manag':222 'may':213 'metric':131 'micropayment API' 'minimum':180 'network':64 'no-api-key-required' 'offer':10,29 'openapi':246 'particular':185 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':92,112,118 'per':3,22,55,81 'platform':6,25,46,124,174 'point':172,231 'post':244 'premium':73,192,228 'price':147,171 'protocol':98 'provid':48 'quot':152 'rate':150,177 'report':132 'request':56,121 'request/response':248 'requir':106 'return':237 'schema':247 'sentiment':139 'settl':58 'sign':116 'simpli':225 'specif':66 'subscript':104 'summar':142 'text':141 'tier':229 'token':151 'unclear':211 'unit':86 'usdc':9,28,60,88,117 'usdc-base-settlement' 'util':15,34,157 'utility-services' 'valid':159,239 'via':95 'web3':146 'wider':123 'x':111 'x-payment':110 'x402':43,97,240 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"b4f4b754-b70b-4270-8667-16eae12a4eda","listingId":"3720c57b-e00f-48c1-b372-4acb7365393d","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/keys/90","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.136Z"}],"sources":[{"listingId":"3720c57b-e00f-48c1-b372-4acb7365393d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/90","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.136Z","lastSeenAt":"2026-04-22T01:02:19.640Z"}],"details":{"listingId":"3720c57b-e00f-48c1-b372-4acb7365393d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/90 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/90"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/90"}],"useCases":["Accessing data analytics and reports without signing up for an API key","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time financial data such as exchange rates, token quotes, and gas estimates","Using utility endpoints like geocoding, validation, and conversion with instant crypto payment"],"bestFor":["Developers who want instant API access without account creation or subscriptions","Agents and bots that can settle payments in USDC on Base per request","Low-volume or sporadic API consumers who prefer pay-as-you-go pricing"],"notFor":["High-volume consumers who need bulk pricing or subscription discounts","Users who cannot transact in USDC on the Base network","Anyone needing detailed API documentation or SLA guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.731Z"},"updatedAt":"2026-04-22T01:02:19.640Z"}}