{"id":"d78ce6c6-070f-4532-9f5f-807d2707221d","shortId":"9UuzDs","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 utility services. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/41` 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 doc/pricing/API pages just show \"Connect wallet\"), so the actual functionality, request schemas, and response formats for each endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","no-rate-limits"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No API documentation available — all doc pages are empty or require wallet connection","No request or response schema provided for any endpoint","The purpose and functionality of /api/v1/charges/41 ('Premium API Access') is entirely unclear","Cannot verify that the advertised AI, analytics, finance, or utility endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/41","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no documentation, no OpenAPI schema, no request/response examples, and no clarity on what this specific endpoint actually does beyond the generic label \"Premium API Access\". All documentation pages return only \"Connect wallet\" with no 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'/request':13,28 '0.02':12,27,62,114,181 '000':108 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '20':107 '300':148 '6':118 'accept':128 'access':101 'across':45 'actual':202 'address':144 'advertis':154 'ai/ml':48 'analysi':158 'analyt':47 'api':5,20,37,72,100 'application/json':138 'attach':83 'base':8,23,69,109,134 'base network api' 'beyond':186 'broader':152 'call':4,19 'caller':81 'challeng':122 'classif':161 'commit':78 'confirm':123 'connect':198 'convers':173 'data':46,175 'decim':119 'direct':142 'doc/pricing/api':194 'document':185 'embed':162 'empti':192 'enabl':36 'endpoint':44,55,93,125,155,211 'essenti':191 'estim':170 'exact':130 'exchang':165 'feed':164 'finance/web3':50 'format':208 'function':203 'gas':169 'generat':176 'geocod':171 'header':87 'howev':184 'i.e':113 'infer':49 'json-response' 'key':73 'land':188 'limit':75 'list':97 'live':127 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'maximum':105 'micropayment api' 'network':9,24,70 'no-api-key' 'no-rate-limits' 'offer':40 'page':189,195 'pay':2,17,58 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':57 'payment':86,131,140 'per':3,18,59 'platform':6,21,38,153 'point':183 'premium':99 'price':163,182 'quot':168 'rate':74,166 'request':60,90,204 'requir':80,103 'respond':136 'respons':207 'schema':205 'scheme':132 'second':149 'sentiment':157 'servic':53 'settl':64 'show':197 'simpli':82 'sinc':115 'specif':92 'summar':160 'text':159 'timeout':150 'token':167 'unit':110 'unknown':213 'upfront':77 'usdc':15,30,66,112,116 'usdc api' 'usdc-base-network' 'use':117 'util':52 'valid':172 'varieti':42 'via':10,25 'wallet':199 'x402':11,26,35,85,121 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"c0e393a0-6024-4aad-9dae-7849c53bb22a","listingId":"d78ce6c6-070f-4532-9f5f-807d2707221d","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/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:27.172Z"}],"sources":[{"listingId":"d78ce6c6-070f-4532-9f5f-807d2707221d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:27.172Z","lastSeenAt":"2026-04-24T12:03:23.154Z"}],"details":{"listingId":"d78ce6c6-070f-4532-9f5f-807d2707221d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/41 \\\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 commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/41"},{"claim":"Platform advertises endpoints across data/analytics, AI/ML, 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/41"}],"useCases":["Accessing miscellaneous API services with per-call USDC micropayments","Testing x402 payment protocol integrations on Base network","Agent-driven API consumption without pre-registration or API keys"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-as-you-go API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation or SDKs","High-volume use cases where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.541Z"},"updatedAt":"2026-04-24T12:03:23.154Z"}}