{"id":"8c363c1c-1a93-4acc-ab76-891953d4d9b6","shortId":"S8negm","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a pay-per-request API marketplace that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/products/8` is labeled \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises several categories of endpoints: 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 $0.02 per request. However, the specific functionality behind `/api/v1/products/8` (\"Premium API Access\") is not documented beyond its title, so the exact data or service it returns is unclear.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with payment details including the USDC contract address on Base (0x8335…) and a 300-second payment timeout. The response MIME type is `application/json`. Documentation on the site is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","general"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["The exact data or service returned by /api/v1/products/8 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content.","No OpenAPI schema, request format, or response examples are available.","The broader platform lists many endpoint categories but it is unclear which are actually functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/8","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/8","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 challenge, but there is virtually no documentation about what /api/v1/products/8 actually returns. No OpenAPI spec, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The specific functionality behind 'Premium API Access' is 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'/call':13,28 '0.02':12,27,66,144 '000':70 '0x8335':194 '20':69 '300':197 '402':183 '6':76 'Base network API' 'USDC API access' 'accept':46 'access':61,155 'address':191 'advertis':101 'ai':113 'analysi':117 'analyt':107 'api':5,20,38,60,79,154,218 'application/json':206 'attach':90 'base':8,23,51,71,193 'behind':151 'beyond':159 'broader':99 'caller':88 'categori':103 'challeng':181 'classif':120 'commit':85 'connect':224 'contract':190 'convers':137 'cost':63 'data':106,110,165 'decim':77 'detail':186,231 'doc':215 'document':158,207 'embed':121 'endpoint':55,105,140,173 'estim':131 'exact':164 'exchang':126 'export':111 'extrem':212 'feed':125 'financ':122 'function':150 'gas':130 'generat':138 'geocod':135 'header':94 'howev':147 'http':182 'includ':187 'infrastructur':133 'insight':112 'json-response' 'key':80 'label':58 'learn':115 'limit':82 'list':142 'live':175 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':114 'marketplac':39 'metric':108 'micropayment API' 'mime':203 'network':9,24,52 'no-api-key' 'no-rate-limit' 'page':219 'pay':2,17,35 'pay-per-call API' 'pay-per-request':1,16,34 'payment':48,93,185,199 'per':3,18,36,67,145 'platform':6,21,100 'premium':59,153 'price':124,216 'prompt':226 'protocol':44 'quot':129 'rate':81,127 'render':221 'report':109 'request':4,19,37,68,97,146 'requir':87 'respons':202 'return':169,177 'second':198 'sentiment':116 'servic':167 'sever':102 'simpli':89 'site':210 'spars':213 'specif':54,149 'summar':119 'technic':230 'text':118 'timeout':200 'titl':161 'token':128 'type':204 'unclear':171 'unit':72 'upfront':84 'usdc':15,30,47,74,189 'usdc-base-network' 'use':41 'util':134 'valid':136,179 'via':10,25 'wallet':225 'web3':123 'x402':11,26,43,92,180 'x402 API' 'x402-payment'","prices":[{"id":"b366c17b-3485-41a4-adf2-7604eaa268df","listingId":"8c363c1c-1a93-4acc-ab76-891953d4d9b6","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:22.829Z"}],"sources":[{"listingId":"8c363c1c-1a93-4acc-ab76-891953d4d9b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:22.829Z","lastSeenAt":"2026-04-22T15:00:37.664Z"}],"details":{"listingId":"8c363c1c-1a93-4acc-ab76-891953d4d9b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/8 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/8"},{"claim":"All endpoints are listed 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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/8"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Integrating pay-as-you-go API calls into autonomous agents on Base","Consuming API services without managing API keys or subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without access to USDC on the Base network","High-volume consumers who need bulk pricing or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.846Z"},"updatedAt":"2026-04-22T15:00:37.664Z"}}