{"id":"9f75e627-cf41-4cd1-a67b-9b06c43d951e","shortId":"cmpSgf","kind":"x402","title":"Pay-per-request API suite on Base (USDC) via x402 — $0.02/call, no API keys required.","tagline":"Pay-per-request API suite on Base (USDC) via x402 — $0.02/call, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/products/42` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913) on Base. The x402 challenge advertises a maximum amount of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe broader platform offers endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nThe platform emphasizes simplicity: no API keys, no rate limits, no minimum commitments, and instant access. Payments are made per-call using the x402 exact-payment scheme. Documentation pages beyond the landing page appear to require a wallet connection and contain no additional readable content.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-endpoint","no-api-key","json-response"],"categories":["api-marketplace","data"],"synonyms":["low payment fee","x402 api","pay per request api","micropayment api","usdc api","base network api","premium api access"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","Documentation, pricing, API, and README pages all render only 'Connect wallet' with no readable content.","The specific functionality of /api/v1/products/42 is unclear; 'Premium API Access' is a generic label.","No request body schema or response examples could be obtained."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/42","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/products/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no request/response examples, and documentation pages are empty (wallet-gated). The specific purpose of /api/v1/products/42 ('Premium API Access') is not explained beyond its title, making it effectively a stub 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'/call':13,30 '/request':150 '0.02':12,29,98,149 '000':88 '0x8335':75 '20':87 '2913':76 '6':93 'accept':67 'access':46,65,168 'across':106 'addit':197 'advertis':82 'ai':116 'amount':85 'analysi':120 'analyt':110 'api':5,15,22,32,44,64,158 'appear':188 'base':8,25,54,78,89 'base network api' 'base-network' 'beyond':184 'broader':102 'call':174 'categori':108 'challeng':81 'classif':123 'collect':38 'commit':165 'connect':193 'contain':195 'content':199 'contract':74 'convers':140 'data':109,113 'decim':94 'document':182 'embed':124 'emphas':155 'endpoint':45,58,105,143 'equal':97 'estim':134 'exact':179 'exact-pay':178 'exchang':129 'export':114 'feed':128 'financ':125 'four':107 'gas':133 'generat':141 'geocod':138 'host':36 'infrastructur':136 'insight':115 'instant':167 'json-response' 'key':16,33,159 'label':62 'land':186 'learn':118 'limit':162 'list':145 'low payment fee' 'lowpaymentfee.com':35 'machin':117 'made':171 'maximum':84 'metric':111 'micropayment api' 'minimum':164 'network':55 'no-api-key' 'offer':104 'page':183,187 'pay':2,19,41 'pay per request api' 'pay-per-request':1,18,40 'payment':50,71,169,180 'per':3,20,42,99,173 'per-cal':172 'per-request-billing' 'platform':103,154 'point':152 'post':68 'post-endpoint' 'premium':63 'premium api access' 'price':127,151 'protocol':51 'quot':132 'rate':130,161 'readabl':198 'report':112 'request':4,21,43,69,100 'requir':17,34,190 'scheme':181 'sentiment':119 'settl':70 'simplic':156 'specif':57 'suit':6,23 'summar':122 'text':121 'token':131 'unit':90 'usdc':9,26,73,96 'usdc api' 'usdc-settlement' 'use':175 'util':137 'valid':139 'via':10,27,47 'wallet':192 'web3':126 'x402':11,28,49,80,177 'x402 api' 'x402-payment'","prices":[{"id":"79380150-f70c-4aaa-8b15-2a16e57e7cd3","listingId":"9f75e627-cf41-4cd1-a67b-9b06c43d951e","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/products/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:17.057Z"}],"sources":[{"listingId":"9f75e627-cf41-4cd1-a67b-9b06c43d951e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:17.057Z","lastSeenAt":"2026-04-23T10:30:29.826Z"}],"details":{"listingId":"9f75e627-cf41-4cd1-a67b-9b06c43d951e","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay $0.02 USDC on Base per call.\ncurl -X POST https://lowpaymentfee.com/api/v1/products/42 \\\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":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/42"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/42"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven workflows that need on-demand API access without pre-registration","Programmatic access to a multi-category API suite (analytics, AI, finance, utilities) with no subscription"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible clients on the Base network","Low-volume or bursty workloads where per-request pricing is economical"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.393Z"},"updatedAt":"2026-04-23T10:30:29.826Z"}}