{"id":"9be72b41-1145-4c9b-a87d-918a3ecb85b1","shortId":"kNJ5vU","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a collection of pay-per-request API endpoints accessible via the x402 protocol on the Base network. The specific endpoint `/api/v1/products/7` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com 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 uniformly priced at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/products/7` endpoint specifically returns. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" actually provides.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","no-rate-limits","pay-per-use"],"categories":["api-marketplace","crypto-payments"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","low payment fee API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","It is unclear what data or functionality the /api/v1/products/7 endpoint actually provides","No request or response examples available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/7","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' at /api/v1/products/7 actually returns. The listing is effectively a 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'/api/v1/products/7':54,201 '/call':13,28 '/docs':170 '/pricing':171 '/readme':174 '0.02':12,27,89,162 '000':79 '0x8335':67 '20':78 '2913':68 '402':211 '6':84 'Base network API' 'USDC API access' 'accept':62 'access':7,22,42,60,229 'across':120 'actual':230 'advertis':74 'ai':130 'analysi':134 'analyt':124 'api':6,21,40,59,93,228 'attach':102 'base':9,24,49,70,80 'broader':115 'caller':100 'categori':122 'challeng':73,216 'classif':137 'collect':34 'confirm':208 'connect':180 'content':186 'contract':66 'convers':154 'data':123,127,224 'decim':85 'descript':197 'document':165,219 'embed':138 'endpoint':41,53,119,157,202,206 'equal':88 'estim':148 'exampl':194 'exchang':143 'export':128 'extrem':167 'feed':142 'financ':139 'four':121 'function':226 'gas':147 'generat':155 'geocod':152 'header':107 'infrastructur':150 'insight':129 'key':94 'learn':132 'limit':97 'list':56 'live':209 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31,116 'machin':131 'maxamountrequir':76 'metric':125 'micropayment API' 'network':50 'no-api-key' 'no-rate-limits' 'offer':118 'openapi':190 'page':175 'pay':2,17,37 'pay-per-call API' 'pay-per-request':1,16,36 'pay-per-use' 'payment':63,106,112 'per':3,18,38,90,163 'per-request-billing' 'platform':117 'premium':5,20,58,227 'price':141,160 'prompt':182 'proof':113 'protocol':46 'provid':231 'quot':146 'rate':96,144 'render':177 'report':126 'request':4,19,39,91,164 'request/response':193 'requir':99 'return':204,210 'schema':191 'sentiment':133 'simpli':101 'spars':168 'specif':52,203 'summar':136 'text':135 'token':145 'unclear':222 'uniform':159 'unit':81 'usdc':15,30,65,87 'usdc-base' 'util':151 'valid':110,153,214 'via':10,25,43 'wallet':181 'web3':140 'without':218 'x':105 'x-payment':104 'x402':11,26,45,72,111,215 'x402 API' 'x402-payment'","prices":[{"id":"16aff081-5aa8-4d83-8282-787dae59949b","listingId":"9be72b41-1145-4c9b-a87d-918a3ecb85b1","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:50.353Z"}],"sources":[{"listingId":"9be72b41-1145-4c9b-a87d-918a3ecb85b1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:50.353Z","lastSeenAt":"2026-04-22T05:30:33.348Z"}],"details":{"listingId":"9be72b41-1145-4c9b-a87d-918a3ecb85b1","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/products/7\n# Returns 402 with x402 challenge. Attach payment header to complete the request.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/7"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/7"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or services without needing an API key or subscription","Agent-driven API consumption where per-call crypto payment is preferred","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 pay-per-request patterns","AI agents that need keyless, on-demand API access settled in USDC on Base","Users who want to avoid subscriptions and pay only for what they use"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T09:47:38.292Z"},"updatedAt":"2026-04-22T05:30:33.348Z"}}