{"id":"2140d959-ccde-44de-8bc9-f6ea2da77e22","shortId":"bJTJVx","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, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/55` is listed as \"Premium API Access\" and advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The x402 challenge confirms the endpoint is live and version 1 compliant with a 300-second payment 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, callers will need to experiment to discover required input fields and response formats.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All documentation pages (/docs, /api, /pricing, /README) return only 'Connect wallet' with no actual content","The specific endpoint /api/v1/transactions/55 has a generic 'Premium API Access' description with no details on what it actually does","Cannot verify what data or service this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/55","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/55","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 schemas, and all doc pages are empty stubs. The specific purpose of /api/v1/transactions/55 ('Premium API Access') is vague and undocumented. This is effectively a stub 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'/request':13,28 '0.02':12,27,62,117,179 '000':107 '0x8335':112 '1':141 '20':106 '300':145 '402 payment API' '6':121 'Base network API' 'USDC API' 'accept':125 'access':100 'account':74 'across':45 'actual':201 'advertis':102,152 'ai/ml':48 'analysi':156 'analyt':47 'api':5,20,37,72,99 'application/json':130 'attach':82 'base':8,23,69,108,114 'base-network' 'beyond':184 'broader':150 'call':4,19 'caller':80,214 'challeng':133 'classif':159 'compliant':142 'confirm':134 'connect':197 'convers':171 'crypto-paid API' 'data':46,173 'decim':122 'discov':220 'document':183,210 'embed':160 'empti':190 'enabl':36 'endpoint':44,55,92,124,136,153,206 'equal':116 'essenti':189 'estim':168 'exchang':163 'experi':218 'feed':162 'field':223 'finance/web3':50 'format':226 'gas':167 'generat':174 'geocod':169 'given':118 'header':86 'howev':182 'individu':205 'infer':49 'infrastructur':52 'input':222 'json-response' 'key':73 'land':186 'limit':77 'list':96 'live':138 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':104 'micropayment API' 'need':216 'network':9,24,70 'no-api-key' 'offer':40 'openapi':212 'page':187,194 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':57 'payment':85,147 'per':3,18,59 'platform':6,21,38,151 'point':181 'post':126 'post-method' 'premium':98 'price':161,180 'quot':166 'rate':76,164 'request':60,89,127 'request/response':202 'requir':79,221 'respons':225 'return':129 'schema':203 'second':146 'sentiment':155 'settl':64 'show':196 'simpli':81 'spec':213 'specif':91 'sub':193 'sub-pag':192 'summar':158 'text':157 'timeout':148 'token':165 'unit':109 'unknown':208 'usdc':15,30,66,111,119 'usdc-settlement' 'util':53 'valid':170 'varieti':42 'version':140 'via':10,25 'wallet':198 'without':209 'x402':11,26,35,84,132 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c334020d-73b4-40f4-a495-5ef361718745","listingId":"2140d959-ccde-44de-8bc9-f6ea2da77e22","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:52.047Z"}],"sources":[{"listingId":"2140d959-ccde-44de-8bc9-f6ea2da77e22","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:52.047Z","lastSeenAt":"2026-04-23T08:31:55.751Z"}],"details":{"listingId":"2140d959-ccde-44de-8bc9-f6ea2da77e22","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/55 \\\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, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/55"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without creating accounts or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need pay-as-you-go API access without subscriptions"],"bestFor":["Developers who want zero-friction API access without signup","AI agents that can autonomously pay for API calls via x402","Users already holding USDC on Base who want instant access"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume callers who would benefit from bulk pricing or subscription discounts","Developers without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.752Z"},"updatedAt":"2026-04-23T08:31:55.751Z"}}