{"id":"65131c04-61e7-411c-9598-dda182cbb958","shortId":"UgbSD3","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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at a flat rate of $0.02 per call, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/transactions/158` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST 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 sub-pages just show \"Connect wallet\"), so the actual request/response schemas for this and other endpoints are unknown. Without documentation or OpenAPI specs, callers must discover behavior experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — all doc/pricing/README pages return only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/transactions/158 is undocumented","Cannot verify what data or service this endpoint actually provides","The broader platform lists many endpoints but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/158","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/transactions/158","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 challenge with clear pricing. However, there is no OpenAPI spec, no documentation of request/response schemas, and all doc pages are empty stubs. The purpose of this specific endpoint (/transactions/158) is unclear beyond the generic label 'Premium API Access'. Effectively a stub 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'/request':13,28 '0.02':12,27,74,119,180 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':113 '20':107 '2913':114 '300':139 '402 payment api' '6':123 'accept':144 'access':98 'actual':202 'address':135 'advertis':153 'ai/ml':49 'analysi':157 'analyt':48 'api':5,20,37,79,97 'application/json':149 'base':8,23,67,109,116 'base network api' 'behavior':220 'beyond':185 'broad':42 'broader':151 'call':4,19,76 'caller':217 'catalog':43 'challeng':103 'classif':160 'commit':86 'connect':198 'convers':172 'data':47,52,174 'decim':124 'discov':219 'document':184,213 'embed':161 'empti':191 'enabl':36 'endpoint':45,57,90,143,154,209 'equal':118 'essenti':190 'estim':169 'exact':131 'exchang':164 'experiment':221 'feed':163 'finance/web3':51 'flat':71 'gas':168 'generat':175 'geocod':170 'given':120 'howev':183 'http':145 'http-post' 'infer':50 'json-api' 'key':80 'land':187 'limit':83 'list':94 'low payment fee' 'lowpaymentfee.com':31 'made':127 'micropayment api' 'must':218 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':215 'page':188,195 'paid':59 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':125 'per':3,18,61,75 'per-request':60 'platform':6,21,38,152 'point':182 'post':146 'premium':96 'price':162,181 'quot':167 'rate':72,82,165 'request':62,104 'request/response':203 'requir':87 'return':100,148 'schema':204 'scheme':132 'second':140 'sentiment':156 'servic':55 'settl':133 'show':197 'span':46 'spec':216 'specif':89 'sub':194 'sub-pag':193 'summar':159 'text':158 'timeout':141 'token':166 'unit':110 'unknown':211 'usdc':15,30,64,112,121 'usdc api' 'usdc-base' 'use':63 'util':54 'valid':171 'via':10,25,128 'wallet':199 'without':212 'x402':11,26,35,102,130 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a8113c6b-4e9e-442e-8d53-b253a3698512","listingId":"65131c04-61e7-411c-9598-dda182cbb958","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/transactions/158","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:44.921Z"}],"sources":[{"listingId":"65131c04-61e7-411c-9598-dda182cbb958","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/158","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:44.921Z","lastSeenAt":"2026-04-23T21:32:38.231Z"}],"details":{"listingId":"65131c04-61e7-411c-9598-dda182cbb958","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/158 \\\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":"Flat pricing of $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/transactions/158"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data 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 wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-friction micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who need bulk pricing or subscription discounts","Developers not set up for USDC payments on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.219Z"},"updatedAt":"2026-04-23T21:32:38.231Z"}}