{"id":"156bc041-e3a2-451f-9a8e-d6765071a627","shortId":"wcqeYu","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network. The x402 protocol eliminates the need for API keys, accounts, or subscriptions — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/182` 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 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 subpages only show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are undocumented. There is no OpenAPI spec, no example payloads, and no detailed endpoint documentation available from the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","no-api-key","json-response","post-method","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payments","no-auth API","micropayment endpoint"],"warnings":["No OpenAPI or schema documentation available — all doc pages return only 'Connect wallet'","The specific functionality of /api/v1/payments/182 ('Premium API Access') is not described anywhere; it may be a generic or placeholder endpoint","No request body schema or response examples are documented for any endpoint on the platform","The platform lists many endpoint categories but none have verifiable documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/182","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/payments/182","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 with clear pricing. However, there is no OpenAPI spec, no request/response schema documentation, no examples, and all doc/pricing/API subpages are empty stubs showing only 'Connect wallet'. The specific purpose of the '/payments/182' endpoint beyond 'Premium API Access' is 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'/request':13,32 '0.02':12,31,72,134,188 '000':123 '0x8335':128 '20':122 '2913':129 '300':147 '402':117 '6':138 'Base network API' 'USDC micropayment API' 'accept':152 'access':113 'account':91 'across':58 'actual':208 'advertis':161 'ai-inference' 'ai/ml':61 'analysi':165 'analyt':60 'api':5,17,24,36,45,89,112 'application/json':157 'attach':96 'avail':229 'base':8,27,80,124,131 'beyond':193 'broad':50 'broader':159 'call':4,23 'caller':94 'catalog':51 'challeng':118 'classif':168 'connect':204 'convers':180 'crawl':232 'crypto API payments' 'data':59,182 'data-analytics' 'decim':139 'detail':226 'document':192,228 'elimin':85 'embed':169 'empti':199 'enabl':44 'endpoint':57,68,105,151,162,213,227 'equal':133 'essenti':198 'estim':177 'exact':144 'exampl':222 'exchang':172 'feed':171 'finance-data' 'finance/web3':63 'gas':176 'generat':183 'geocod':178 'given':135 'header':99 'howev':191 'individu':212 'infer':62 'json-response' 'key':18,37,90 'land':195 'list':109 'lowpaymentfee' 'lowpaymentfee.com':39 'micropayment endpoint' 'need':87 'network':9,28,81 'no-api-key' 'no-auth API' 'offer':48 'openapi':219 'page':196 'paid':75 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payload':223 'payment':98,141 'per':3,22,55,73 'platform':6,25,46,160 'point':190 'post':153 'post-method' 'premium':111 'price':70,170,189 'protocol':84 'quot':175 'rate':173 'request':56,74,102,119,154 'request/response':209 'requir':19,38 'return':115,156 'schema':210 'scheme':142 'second':148 'sentiment':164 'servic':66 'show':203 'simpli':95 'spec':220 'specif':104 'subpag':201 'subscript':93 'summar':167 'text':166 'timeout':149 'token':174 'undocu':215 'unit':125 'usdc':15,34,77,127,136 'usdc-base-network' 'util':65 'utility-services' 'valid':179 'via':10,29 'wallet':205 'x402':11,30,43,83 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3a2c120a-ffe8-4716-856e-59236962de51","listingId":"156bc041-e3a2-451f-9a8e-d6765071a627","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/payments/182","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:43.057Z"}],"sources":[{"listingId":"156bc041-e3a2-451f-9a8e-d6765071a627","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/182","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:43.057Z","lastSeenAt":"2026-04-23T05:01:22.349Z"}],"details":{"listingId":"156bc041-e3a2-451f-9a8e-d6765071a627","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/182 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/182"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/182"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","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":["Agents that need on-demand API access without managing API keys or subscriptions","Paying for individual AI inference calls (sentiment, summarization, classification) with USDC","Fetching real-time crypto quotes, gas estimates, or exchange rates per request","Geocoding or data validation as a utility service with no commitment"],"bestFor":["AI agents and bots that can attach x402 payment headers automatically","Developers who want zero-signup, pay-as-you-go API access","Low-volume or sporadic API consumers who don't want subscriptions","Web3-native applications already operating on Base network"],"notFor":["High-volume consumers who need bulk pricing or rate-limit guarantees","Users without USDC on Base network or unfamiliar with x402 protocol","Applications requiring detailed API documentation or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.081Z"},"updatedAt":"2026-04-23T05:01:22.349Z"}}