{"id":"a5f1547e-399b-4a6d-8d5b-178aad8884c6","shortId":"dPK7g2","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/products/46` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimal places.\n\nThe broader platform advertises four categories of APIs: 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. The platform claims no API keys, no rate limits, and instant access — payment is handled entirely via the x402 protocol's X-PAYMENT header.\n\nNote that the `/api/v1/products/46` endpoint does not clearly map to any of the named API categories on the landing page. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown. Without documentation or example payloads, it is unclear what data this specific endpoint returns or what input it expects beyond a POST with a valid x402 payment header.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee API"],"warnings":["Documentation pages (/docs, /pricing, /README) all returned only 'Connect wallet' with no substantive content","The endpoint path /api/v1/products/46 does not match any named API on the landing page — its actual function is unknown","No request or response schema is available; input format and output structure are entirely undocumented","No OpenAPI spec or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/46","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/46","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 it is operational. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response payloads, and the specific purpose of /api/v1/products/46 is unclear. This is effectively a stub listing with confirmed liveness but minimal usable 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'/docs':203 '/pricing':204 '/readme':205 '/request':17,34,153 '0.02':16,33,95,152 '000':84 '0x8335':89 '20':83 '2913':90 '6':101 'Base network API' 'USDC API' 'accept':70 'access':68,167 'actual':218 'advertis':107 'ai':10,27,119 'amount':80 'analysi':123 'analyt':113 'api':4,21,40,67,111,160,195 'base':7,24,56,85,92 'base-network' 'behind':48 'beyond':245 'broader':105 'categori':109,196 'challeng':77 'claim':158 'classif':126 'clear':188 'collect':45 'connect':209 'content':215 'convers':143 'data':9,26,112,116,235 'decim':102 'document':201,227 'embed':127 'endpoint':14,31,47,60,146,185,223,238 'entir':171 'equal':94 'estim':137 'exampl':229 'exchang':132 'expect':244 'export':117 'feed':131 'financ':11,28,128 'four':108 'gas':136 'gate':3,20,43 'generat':144 'geocod':141 'given':98 'handl':170 'header':180,253 'infrastructur':139 'input':242 'insight':118 'instant':166 'json-response' 'key':161 'land':199 'learn':121 'limit':164 'list':64,148 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'map':189 'marketplac':41 'maximum':79 'metric':114 'micropay':53 'micropayment API' 'name':194 'network':57 'no-api-key' 'note':181 'offer':8,25 'page':200,202 'pay-per-request API' 'payload':230 'payment':76,168,179,252 'per':50,96 'per-request':49 'per-request-billing' 'place':103 'platform':5,22,106,157 'point':155 'post':71,247 'post-endpoint' 'premium':66 'price':130,154 'prompt':211 'protocol':39,175 'quot':135 'rate':133,163 'report':115 'request':51,72,97 'request/response':219 'requir':81 'return':206,239 'schema':220 'sentiment':122 'specif':59,237 'substant':214 'summar':125 'text':124 'token':134 'unclear':233 'unit':86 'unknown':225 'usdc':52,88,99 'usdc-micropayment' 'util':13,30,140 'valid':142,250 'via':172 'wallet':210 'web3':129 'without':226 'x':178 'x-payment':177 'x402':2,19,38,75,174,251 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f8f5f9fd-5765-4d1a-b3be-f31cf1cca958","listingId":"a5f1547e-399b-4a6d-8d5b-178aad8884c6","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/46","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:24.371Z"}],"sources":[{"listingId":"a5f1547e-399b-4a6d-8d5b-178aad8884c6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/46","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:24.371Z","lastSeenAt":"2026-04-23T22:01:42.762Z"}],"details":{"listingId":"a5f1547e-399b-4a6d-8d5b-178aad8884c6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/46 \\\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 returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/46"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/46"},{"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":"The platform offers APIs in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or analytics via per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to utility or data endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access on Base","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Applications requiring free or subscription-based access without crypto wallets","High-volume use cases where per-request pricing may accumulate costs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:59.739Z"},"updatedAt":"2026-04-23T22:01:42.762Z"}}