{"id":"a546da47-8160-4bc5-a1be-a873a40f2975","shortId":"d2bNnn","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/30` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform also advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. Documentation pages (docs, pricing, README) appear to be behind a wallet-connect gate and provide no additional technical detail in the crawl.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation beyond the landing page listing, the actual behavior of each endpoint is unclear. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what data or functionality `/api/v1/transactions/30` specifically returns is not documented in any crawled material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","Documentation, pricing, and README pages are behind a wallet-connect gate and returned no useful content","The specific purpose and expected input/output of /api/v1/transactions/30 ('Premium API Access') is not documented anywhere in crawled material","The breadth of advertised endpoints (AI, finance, analytics, utilities) cannot be verified from available material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/30","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/30","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 with a valid x402 402 challenge, but there is no OpenAPI schema, no request/response examples, and documentation pages are gated behind wallet-connect with no useful content. The purpose of `/api/v1/transactions/30` specifically is undocumented. Pricing is clear ($0.02 USDC per call) but functional details are almost entirely 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'/request':13,30 '0.02':12,29,123,155 '000':117 '20':116 '402':214 'access':110 'across':50 'actual':199 'addit':130,175 'advertis':129 'ai-inference' 'ai/ml':53 'also':128 'analysi':134 'analyt':52 'api':5,15,22,32,41,81,109 'appear':163 'attach':92 'base':8,25,71,118 'base network api' 'behavior':200 'behind':166 'beyond':193 'broad':46 'call':4,21,125 'caller':90 'challeng':216 'classif':137 'classification' 'commit':89 'confirm':209 'connect':170 'convers':147 'crawl':180,230 'crypto payment api' 'crypto-data' 'data':51,56,149,219 'data-analytics' 'detail':177 'doc':160 'document':158,192,227 'embed':138 'embeddings' 'enabl':40 'endpoint':49,61,102,131,203,207 'estim':144 'exampl':189 'exchang':141 'export':150 'feed':140 'finance-data' 'finance/web3':55 'function':221 'gas':143 'gate':171 'geocod':145 'geocoding' 'header':96 'i.e':122 'infer':54 'key':16,33,82 'land':195 'limit':85 'list':106,197 'live':210 'low payment fee' 'lowpaymentfee.com':35 'materi':231 'maximum':114 'micropayment api' 'network':9,26,72 'no-api-key' 'no-auth api' 'offer':44 'openapi':185 'page':159,196 'pay':2,19,64 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':63 'payment':95 'per':3,20,65,124 'platform':6,23,42,127 'point':157 'premium':108 'price':139,156,161 'proper':213 'protocol':77 'provid':173 'rate':84,142 'readm':162 'request':66,99 'request/response':188 'requir':17,34,112 'return':211,224 'schema':186 'sentiment':133 'sentiment-analysis' 'servic':59 'set':47 'settl':73 'simpli':91 'specif':101,223 'subscript':88 'summar':136 'technic':176 'text':135 'text-summarization' 'unclear':205 'unit':119 'usdc':68,121 'usdc api' 'usdc-base-network' 'use':67 'util':58 'utility-services' 'valid':146 'via':10,27,74 'wallet':169 'wallet-connect':168 'x402':11,28,39,76,94,215 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"e98454c5-c8a2-40a8-8aa4-de8e3bad548b","listingId":"a546da47-8160-4bc5-a1be-a873a40f2975","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/30","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:25:50.768Z"}],"sources":[{"listingId":"a546da47-8160-4bc5-a1be-a873a40f2975","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/30","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:25:50.768Z","lastSeenAt":"2026-04-22T11:32:22.920Z"}],"details":{"listingId":"a546da47-8160-4bc5-a1be-a873a40f2975","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/30 \\\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 are 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":"The /api/v1/transactions/30 endpoint returns a 402 x402 challenge requiring 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/30"},{"claim":"Platform advertises endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto and finance data (token quotes, gas estimates, exchange rates) on a per-call basis","Running utility operations like geocoding, validation, and data conversion with micropayments","Integrating pay-per-use data analytics and export into agent workflows"],"bestFor":["Developers wanting zero-friction API access without signup or API keys","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost, pay-as-you-go access to diverse utility and data endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring high-throughput bulk access at volume-discounted pricing","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.613Z"},"updatedAt":"2026-04-22T11:32:22.920Z"}}