{"id":"299aa9a1-a91e-4f1c-99e6-ae981bc11bce","shortId":"2mxdUq","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. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/products/73` is listed as \"Premium API Access\" and returns a 402 challenge requesting payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The response MIME type is application/json.\n\nThe broader platform advertises categories including: 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 (geocoding, validation, conversion, generation). All are priced at $0.02 per request. However, the crawled documentation pages (docs, pricing, API, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind these endpoints cannot be independently verified from the crawl data alone.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no substantive content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/products/73 ('Premium API Access') is not described anywhere","The broad catalog of endpoints advertised on the homepage cannot be verified from crawl data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/73","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/73","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 with clear pricing. However, all documentation pages returned only 'Connect wallet' with no actual content, there is no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/products/73' specifically is unclear beyond the generic label 'Premium API Access'. The platform's broad claims about many endpoint categories cannot be 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'/request':13,28 '0.02':12,27,114,186 '000':103 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x8335':108 '20':102 '2913':109 '300':135 '402':95 '6':119 'Base network API' 'USDC micropayment API' 'access':91 'actual':211 'address':131 'advertis':147 'ai':157 'ai/ml':49 'alon':224 'analysi':161 'analyt':48,151 'api':5,20,37,71,90,196 'application/json':143 'base':8,23,67,104,111 'behind':213 'broad':42 'broader':145 'call':4,19,116 'cannot':216 'catalog':43 'categori':148 'challeng':96 'classif':164 'commit':79 'connect':202 'content':208 'convers':180 'crawl':191,222 'crypto-paid API' 'data':47,52,150,154,223 'decim':120 'doc':194 'document':192 'embed':165 'enabl':36 'endpoint':45,57,83,215 'equal':113 'estim':175 'exact':127 'exchang':170 'export':155 'feed':169 'financ':166 'finance/web3':51 'function':212 'gas':174 'generat':181 'geocod':178 'howev':189 'includ':149 'independ':218 'infer':50 'infrastructur':177 'insight':156 'json-response' 'key':72 'learn':159 'limit':75 'list':87 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':158 'made':123 'metric':152 'mime':140 'minimum':78 'network':9,24,68 'no-api-key' 'no-rate-limit' 'offer':40 'page':193 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payment':98,121 'per':3,18,61,115,187 'platform':6,21,38,146 'premium':89 'price':168,184,195 'prompt':204 'quot':173 'rate':74,171 'readm':197 'report':153 'request':62,97,188 'requir':80 'respons':139 'return':93,199 'scheme':128 'second':136 'sentiment':160 'servic':55 'settl':129 'span':46 'specif':82 'substant':207 'summar':163 'text':162 'timeout':137 'token':172 'type':141 'unit':105 'usdc':15,30,64,107,117 'usdc-base' 'use':63,118 'util':54 'valid':179 'verifi':219 'via':10,25,124 'wallet':203 'web3':167 'x402':11,26,35,126 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"415d9551-af29-4fe4-ab20-317bcf70e73f","listingId":"299aa9a1-a91e-4f1c-99e6-ae981bc11bce","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:26.153Z"}],"sources":[{"listingId":"299aa9a1-a91e-4f1c-99e6-ae981bc11bce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:26.153Z","lastSeenAt":"2026-04-22T12:03:17.302Z"}],"details":{"listingId":"299aa9a1-a91e-4f1c-99e6-ae981bc11bce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/73 \\\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":"Endpoint returns 402 with x402 challenge requesting up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/73"},{"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 address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/73"},{"claim":"Platform lists categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing to register or manage API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-use endpoints"],"bestFor":["Developers or agents wanting keyless, pay-as-you-go API access","x402-compatible clients on the Base network","Low-volume or sporadic API consumers who don't want subscriptions"],"notFor":["Users without USDC on Base network or an x402-compatible client","High-volume consumers who need bulk pricing or SLAs","Anyone requiring detailed documentation or guaranteed uptime commitments"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.944Z"},"updatedAt":"2026-04-22T12:03:17.302Z"}}