{"id":"860b0026-c497-41e7-afc5-766fb6794bfc","shortId":"G265ZW","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. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 payment challenge is live and returns a standard 402 response with an \"exact\" payment scheme.\n\nThe specific endpoint at `/api/v1/transactions/356` is listed as \"Premium API Access\" and accepts POST requests. The probe confirms it is live, returning a valid 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 sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints remain undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No API documentation available — /docs, /pricing, and /README pages all return only 'Connect wallet' with no content.","The purpose and expected input/output of /api/v1/transactions/356 ('Premium API Access') is not described anywhere.","No OpenAPI spec or response schema is provided for any endpoint.","The broad catalog of endpoints (AI, finance, geo, etc.) is advertised but none have verifiable documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/356","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/356","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 pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no response examples, and all documentation pages return only a wallet-connect prompt. The actual functionality behind 'Premium API Access' at /api/v1/transactions/356 is unexplained — the endpoint name and description are generic. This is effectively a stub 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'/docs':191 '/pricing':192 '/readme':193 '/request':13,28 '0.02':12,27,59,138,185 '000':127 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':149 '0x8335':132 '20':126 '2913':133 '300':152 '402':90 '402 payment api' '6':142 'accept':109 'access':107 'actual':206 'addit':159 'address':148 'advertis':158 'ai-inference' 'ai/ml':49 'analysi':163 'analyt':48 'api':5,20,37,71,106 'base':8,23,67,128,135 'base network api' 'behavior':207 'broad':42 'broader':156 'call':4,19 'catalog':43 'challeng':83,122 'classif':166 'classification' 'commit':79 'confirm':114 'connect':197 'content':203 'convers':178 'cost':58 'crypto-quotes' 'data':47,52 'data-analytics' 'decim':143 'document':189 'embed':167 'embeddings' 'enabl':36 'endpoint':45,57,99,160,213 'equal':137 'estim':175 'everi':56 'exact':94 'exchang':170 'feed':169 'finance-data' 'finance/web3':51 'gas':174 'generat':180 'geocod':176 'geocoding' 'given':139 'howev':188 'includ':161 'infer':50 'key':72 'limit':75 'list':103 'live':85,117 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,68 'offer':40 'page':190 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':82,95,144 'per':3,18,60 'platform':6,21,38,157 'point':187 'post':110 'premium':105 'price':168,186 'probe':113 'prompt':199 'quot':173 'rate':74,171 'remain':214 'request':61,111,123 'respons':91,209 'return':87,118,194 'schema':210 'scheme':96 'second':153 'sent':146 'sentiment':162 'sentiment-analysis' 'servic':55 'span':46 'specif':98 'standard':89 'substant':202 'summar':165 'text':164 'text-summarization' 'timeout':154 'token':172 'undocu':215 'unit':129 'upfront':78 'usdc':15,30,64,131,140 'usdc api' 'usdc-base' 'util':54 'utility-services' 'valid':120,177 'via':10,25 'wallet':198 'x402':11,26,35,81,121 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d0f6e9b4-13f5-49b5-81ef-ded206178806","listingId":"860b0026-c497-41e7-afc5-766fb6794bfc","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/356","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:18.033Z"}],"sources":[{"listingId":"860b0026-c497-41e7-afc5-766fb6794bfc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/356","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:18.033Z","lastSeenAt":"2026-04-22T18:32:34.929Z"}],"details":{"listingId":"860b0026-c497-41e7-afc5-766fb6794bfc","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# After constructing the X-PAYMENT header per x402 spec:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/356 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-payment-payload>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a live 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/356"},{"claim":"Platform advertises $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/356"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Running geocoding, validation, or data conversion tasks with instant USDC micropayments","Exporting data or generating analytics reports via pay-as-you-go endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","Agents that can settle x402 payments in USDC on Base","Projects needing a variety of lightweight utility and AI endpoints without rate limits"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.346Z"},"updatedAt":"2026-04-22T18:32:34.929Z"}}