{"id":"7fd5362f-d2f4-4bd8-8dd5-7c1784b56262","shortId":"7AD4pr","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call costs $0.02 in USDC on the Base network, settled via the x402 exact-payment scheme. No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe specific endpoint at `/api/v1/payments/387` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which has 6 decimals), equating to $0.02 per call. 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 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 and unverified.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","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","micropayment api","base network api","usdc api","no-auth api","lowpaymentfee"],"warnings":["No API documentation available — docs, pricing, and README pages all return only 'Connect wallet'","No request or response schema provided for this endpoint or any other listed endpoint","The purpose of '/api/v1/payments/387' ('Premium API Access') is vague and not explained anywhere","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/387","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/payments/387","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 documented request/response formats, and all documentation pages return only 'Connect wallet' with no content. The actual functionality behind 'Premium API Access' at /api/v1/payments/387 is unspecified. This is effectively a stub 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'/request':12,28 '0.02':11,27,64,137,180 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':130 '20':123 '300':148 '6':133 'accept':113 'access':111 'account':82 'across':52 'actual':201 'address':144 'advertis':119,154 'ai-inference' 'ai/ml':55 'analysi':158 'analyt':54 'api':5,14,21,30,39,80,110 'asset':129 'attach':90 'base':8,24,69,125 'base network api' 'behavior':202 'broad':44 'broader':152 'call':4,20,62,139 'caller':88 'catalog':45 'challeng':118 'classif':161 'classification' 'connect':192 'content':198 'convers':173 'cost':63 'crypto-quotes' 'data':53 'data-analytics' 'decim':134 'direct':142 'doc':186 'document':184 'embed':162 'embeddings' 'enabl':38 'endpoint':51,103,155,208 'equat':135 'estim':170 'exact':76 'exact-pay':75 'exchang':165 'feed':164 'finance-data' 'finance/web3':57 'gas':169 'generat':175 'geocod':171 'geocoding' 'header':95 'howev':183 'infer':56 'infrastructur':59 'key':15,31,81 'limit':85 'list':107 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':33 'maxamountrequir':121 'micropayment api' 'network':70 'no-api-key' 'no-auth api' 'offer':42 'page':185 'pay':2,18,48 'pay per call api' 'pay-per-cal':1,17 'pay-per-request':47 'payment':77,94,99,140 'per':3,19,49,138 'platform':6,22,40,153 'point':182 'post':114 'premium':109 'price':163,181,187 'prompt':194 'proof':100 'quot':168 'rate':84,166 'readm':188 'remain':209 'request':50,115 'requir':16,32,87 'respons':204 'return':189 'schema':205 'scheme':78 'second':149 'sentiment':157 'sentiment-analysis' 'settl':71 'simpli':89 'specif':102 'substant':197 'summar':160 'text':159 'text-summarization' 'timeout':150 'token':167 'undocu':210 'unit':126 'unverifi':212 'usdc':66,128 'usdc api' 'usdc-base' 'util':60 'utility-services' 'valid':98,172 'via':9,25,72 'wallet':193 'x':93 'x-payment':92 'x402':10,26,37,74,117 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"a7a6b6b7-11ef-4e7a-8738-4c1020c82d03","listingId":"7fd5362f-d2f4-4bd8-8dd5-7c1784b56262","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/payments/387","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:45.255Z"}],"sources":[{"listingId":"7fd5362f-d2f4-4bd8-8dd5-7c1784b56262","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/387","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:45.255Z","lastSeenAt":"2026-04-23T02:01:19.811Z"}],"details":{"listingId":"7fd5362f-d2f4-4bd8-8dd5-7c1784b56262","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/387 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform advertises $0.02/request pricing 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, equating to $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/387"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (docs, pricing, README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agent-driven API calls without pre-registration or API key management","Micropayment-gated access to AI inference (sentiment, summarization, classification, embeddings)","On-demand financial data retrieval (prices, exchange rates, gas estimates)","Utility operations like geocoding, validation, and data conversion"],"bestFor":["AI agents needing frictionless, keyless API access via x402","Developers who want pay-as-you-go pricing with no commitments","Applications requiring diverse lightweight API calls at low cost"],"notFor":["High-volume batch processing where per-call fees add up quickly","Users who need detailed API documentation or guaranteed SLAs","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.175Z"},"updatedAt":"2026-04-23T02:01:19.811Z"}}