{"id":"63541dea-bc2a-4022-9f38-0f51823164ad","shortId":"vs3GfY","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/cards/28` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four 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 the same $0.02/request price point.\n\nThe `/api/v1/cards/28` endpoint itself lacks detailed documentation — the docs, pricing, and API 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 this specific \"cards\" resource returns. The endpoint is confirmed live via a valid 402 challenge, but the actual functionality behind this particular path is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","no-rate-limit","post-endpoint"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","micropayment api","pay-per-request api","base network api","usdc api access","402 payment api"],"warnings":["No documentation available for /api/v1/cards/28 — unclear what 'Premium API Access' returns","No OpenAPI schema or request/response examples provided","Docs, pricing, and API pages render only 'Connect wallet' with no content","The 'cards/28' path does not correspond to any of the advertised endpoint categories on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/28","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/cards/28","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 via a valid 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/cards/28 actually returns. The docs/pricing/API pages are empty beyond a wallet connect prompt. The listing is essentially a stub with confirmed 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'/request':17,34,165 '0.02':16,33,78,93,164 '000':84 '20':83 '402':218 '402 payment api' '6':91 'access':45,73 'actual':222 'advertis':119 'ai':10,27,131 'analysi':135 'analyt':125 'api':4,21,41,72,95,179 'attach':104 'avail':231 'base':7,24,61,85 'base network api' 'behind':51,224 'broader':117 'call':80 'caller':102 'card':207 'categori':121 'challeng':219 'classif':138 'confirm':213 'connect':185 'content':191 'convers':155 'cost':75 'data':9,26,124,128 'decim':92 'descript':202 'detail':173 'doc':176 'document':174 'embed':139 'endpoint':14,31,50,65,123,158,170,211 'estim':149 'exampl':199 'exchang':144 'export':129 'feed':143 'financ':11,28,140 'four':120 'function':223 'gas':148 'gate':3,20,44 'generat':156 'geocod':153 'header':109 'infrastructur':151 'insight':130 'key':96 'lack':172 'learn':133 'limit':99 'list':69,160 'live':214 'low payment fee' 'lowpaymentfee.com':35 'machin':132 'marketplac':42 'materi':232 'maxamountrequir':81 'metric':126 'micropay':55 'micropayment api' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':195 'page':180 'particular':226 'path':227 'pay-per-request api' 'payment':108,114 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,118 'point':167 'post-endpoint' 'premium':71 'price':142,166,177 'prompt':187 'proof':115 'protocol':40 'quot':147 'rate':98,145 'render':182 'report':127 'request':54 'request/response':198 'requir':101 'resourc':208 'return':209 'schema':196 'sentiment':134 'settl':56 'simpli':103 'specif':64,206 'summar':137 'text':136 'token':146 'unclear':229 'unit':86 'usdc':58,88 'usdc api access' 'usdc-base' 'util':13,30,152 'valid':112,154,217 'varieti':48 'via':215 'wallet':186 'web3':141 'x':107 'x-payment':106 'x402':2,19,39,113 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"2e5a1722-2c41-4d68-a08c-29c4da914616","listingId":"63541dea-bc2a-4022-9f38-0f51823164ad","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/cards/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:31.606Z"}],"sources":[{"listingId":"63541dea-bc2a-4022-9f38-0f51823164ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:31.606Z","lastSeenAt":"2026-04-23T04:01:13.996Z"}],"details":{"listingId":"63541dea-bc2a-4022-9f38-0f51823164ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/28 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/28"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/28"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating x402-compatible agents that autonomously purchase API calls on Base","Accessing various data, AI, finance, or utility endpoints via a single payment protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402 payment capabilities on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing for cost savings","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.099Z"},"updatedAt":"2026-04-23T04:01:13.996Z"}}