{"id":"f044f874-ffc9-4e26-8751-d630a7343267","shortId":"AuNK7q","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 variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/cards/38` 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). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no sign-up required.\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.\n\nThe `/api/v1/cards/38` endpoint itself lacks detailed documentation — the docs, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 x402 challenge), but what data or functionality \"Premium API Access\" specifically provides at this path is unclear from the available information.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","no-rate-limit","http-post"],"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 OpenAPI or schema documentation available for this endpoint","The docs, pricing, and README pages render only 'Connect wallet' with no usable content","The specific functionality of /api/v1/cards/38 ('Premium API Access') is not described anywhere in the crawled material","Cannot determine what request body to send or what response to expect"],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/38","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/38","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 with a valid x402 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific functionality of '/api/v1/cards/38' is undocumented. The listing is effectively a stub with only pricing and protocol details 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'/request':17,34,159 '0.02':16,33,75,90,158 '000':81 '20':80 '402':212 '402 payment api' '6':88 'access':70,222 'advertis':114 'ai':10,27,126 'analysi':130 'analyt':120 'api':4,21,41,69,100,118,221 'avail':199,232 'base':7,24,59,82 'base network api' 'behind':49 'broader':112 'call':77 'categori':116 'challeng':214 'classif':133 'confirm':207 'connect':179 'content':185 'convers':149 'cost':72 'crawl':202 'data':9,26,119,123,217 'decim':89 'detail':167 'doc':170 'document':168,194 'embed':134 'endpoint':14,31,48,63,152,164,205 'estim':144 'exact':97 'exampl':198 'exchang':139 'export':124 'feed':138 'financ':11,28,135 'four':115 'function':219 'gas':143 'gate':3,20,44 'generat':150 'geocod':147 'handl':93 'http-post' 'inform':233 'infrastructure/utilities':146 'insight':125 'key':101 'lack':166 'learn':128 'limit':104 'list':66,154 'live':208 'low payment fee' 'lowpaymentfee.com':35 'machin':127 'marketplac':42 'materi':203 'maxamountrequir':78 'metric':121 'micropay':53 'micropayment api' 'network':60 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':189 'page':174 'path':227 'pay-per-request api' 'payment':91 'per':51,76 'per-request':50 'per-request-micropayment' 'platform':5,22,113 'point':161 'premium':68,220 'price':137,160,171 'prompt':181 'proper':211 'protocol':40 'provid':224 'quot':142 'rate':103,140 'readm':173 'render':176 'report':122 'request':52 'request/response':192 'requir':110 'return':209 'schema':193 'scheme':98 'sentiment':129 'settl':54 'sign':108 'sign-up':107 'spec':190 'specif':62,223 'summar':132 'text':131 'token':141 'unclear':229 'unit':83 'usag':197 'usdc':56,85 'usdc api access' 'usdc-base' 'util':13,30 'valid':148 'varieti':46 'via':94 'wallet':180 'web3':136 'x402':2,19,39,96,213 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"8a68d118-6fa1-499f-b1a2-15fd3844000c","listingId":"f044f874-ffc9-4e26-8751-d630a7343267","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:34.038Z"}],"sources":[{"listingId":"f044f874-ffc9-4e26-8751-d630a7343267","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:34.038Z","lastSeenAt":"2026-04-23T04:31:07.619Z"}],"details":{"listingId":"f044f874-ffc9-4e26-8751-d630a7343267","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. Send POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/38\n# 2. Parse the 402 response, construct an X-PAYMENT header\n#    with a signed USDC transfer of 20000 base units ($0.02),\n#    then resend the request with that header.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/38"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/38"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without pre-registration or API key management","Paying per-call for data, AI inference, or utility endpoints using USDC on Base","Integrating x402-compatible payment flows into automated workflows"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-native agents that can settle USDC micropayments on Base","Low-volume or bursty workloads where per-request pricing is preferable to subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.977Z"},"updatedAt":"2026-04-23T04:31:07.619Z"}}