{"id":"4a0208e1-eb17-435e-92ce-62ed6197495f","shortId":"cT2Sur","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 `/api/v1/cards/24` 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 endpoint 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 listed at the same $0.02/request price point.\n\nThe `/api/v1/cards/24` endpoint itself does not have detailed documentation beyond its title. The crawled docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content, so the actual request/response schema for this specific endpoint is unknown. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-pricing","no-api-key","http-post"],"categories":["api-marketplace","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-request API","USDC API access","Base network API"],"warnings":["No documentation available for /api/v1/cards/24 — request body schema and response format are unknown","All secondary pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content","The specific function of the 'cards/24' endpoint is unclear; 'Premium API Access' is a generic label","No OpenAPI spec or ai-plugin manifest discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/24","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response documentation, no examples, and the docs/pricing/API pages all render only a wallet-connect prompt. The purpose of `/api/v1/cards/24` specifically is entirely opaque beyond its generic 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'/request':17,34,163 '0.02':16,33,77,92,162 '000':83 '20':82 '402':215 '6':90 'Base network API' 'USDC API access' 'access':45,72 'actual':198 'addit':194 'advertis':118 'ai':10,27,129 'analysi':133 'analyt':123 'api':4,21,41,71,94,183 'attach':103 'base':7,24,61,84 'base-network' 'behind':51 'beyond':175 'broader':116 'call':79 'caller':101 'categori':121 'challeng':216 'classif':136 'confirm':210 'connect':189 'content':195 'convers':153 'cost':74 'crawl':179 'data':9,26,122,126 'decim':91 'detail':173 'doc':180 'document':174 'embed':137 'endpoint':14,31,50,65,120,156,168,204,208 'estim':147 'exchang':142 'export':127 'feed':141 'financ':11,28,138 'four':119 'gas':146 'gate':3,20,44 'generat':154 'geocod':151 'header':108 'http-post' 'infrastructur':149 'insight':128 'key':95 'learn':131 'limit':98 'list':68,158 'live':211 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':130 'marketplac':42 'maxamountrequir':80 'metric':124 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'page':184 'pay-per-request API' 'payment':107,113 'per':53,78 'per-request':52 'per-request-pricing' 'platform':5,22,117 'point':165 'premium':70 'price':140,164,181 'prompt':191 'proof':114 'protocol':40 'quot':145 'rate':97,143 'render':186 'report':125 'request':54 'request/response':199 'requir':100 'respons':217 'schema':200 'sentiment':132 'settl':56 'simpli':102 'specif':64,203 'summar':135 'text':134 'titl':177 'token':144 'unit':85 'unknown':206 'usdc':58,87 'usdc-micropayment' 'util':13,30,150 'valid':111,152,214 'varieti':48 'via':212 'wallet':190 'web3':139 'x':106 'x-payment':105 'x402':2,19,39,112 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"46efa182-c7c5-4832-b452-d8da7c371324","listingId":"4a0208e1-eb17-435e-92ce-62ed6197495f","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/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:23.171Z"}],"sources":[{"listingId":"4a0208e1-eb17-435e-92ce-62ed6197495f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:23.171Z","lastSeenAt":"2026-04-22T10:01:39.578Z"}],"details":{"listingId":"4a0208e1-eb17-435e-92ce-62ed6197495f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/24 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/24"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/24"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data/analytics/AI/finance endpoints without subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.465Z"},"updatedAt":"2026-04-22T10:01:39.578Z"}}