{"id":"4f705dfd-73cd-45f8-bc47-3e369385ecc7","shortId":"azXPVr","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/47` 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 x402 payment header to each request.\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\nHowever, the specific endpoint `/api/v1/cards/47` does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access\" with no further documentation about what data or functionality it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical documentation, OpenAPI schema, or usage examples. This makes it difficult to determine the actual purpose or response format of this particular endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["x402 api","micropayment api","pay-per-request api","base network api","usdc api access","lowpaymentfee","low payment fee"],"warnings":["The specific endpoint /api/v1/cards/47 has no documentation explaining what it returns or what input it expects.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no technical content.","No OpenAPI spec, no example request/response, and no input schema are available.","The endpoint path 'cards/47' does not correspond to any of the documented API categories on the landing page."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/47","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example responses, and the purpose of `/api/v1/cards/47` is entirely opaque. The docs/pricing/API pages all render only 'Connect wallet' with no usable 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'/request':17,34,158 '0.02':16,33,75,90,157 '000':81 '20':80 '6':88 'access':70,183 'actual':225 'addit':210 'advertis':112 'ai':10,27,124 'analysi':128 'analyt':118 'api':4,21,41,69,92,116,175,182,199 'attach':101 'base':7,24,59,82 'base network api' 'behind':49 'broader':110 'call':77 'caller':99 'categori':114,176 'classif':131 'clear':168 'connect':205 'convers':148 'cost':72 'data':9,26,117,121,190 'decim':89 'descript':178 'determin':223 'difficult':221 'doc':196 'document':174,187,212 'embed':132 'endpoint':14,31,48,63,151,164,233 'estim':142 'exampl':217 'exchang':137 'export':122 'feed':136 'financ':11,28,133 'format':229 'four':113 'function':192 'gas':141 'gate':3,20,44 'generat':149 'geocod':146 'header':105 'howev':161 'infrastructur':144 'insight':123 'json-response' 'key':93 'learn':126 'limit':96 'list':66,153 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':125 'make':219 'map':169 'marketplac':42 'maxamountrequir':78 'metric':119 'micropay':53 'micropayment api' 'network':60 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':213 'page':200 'particular':232 'pay-per-request api' 'payment':104 'per':51,76 'per-request':50 'per-request-micropayment' 'platform':5,22,111 'point':160 'post-method' 'premium':68,181 'price':135,159,197 'prompt':207 'protocol':40 'purpos':226 'quot':140 'rate':95,138 'render':202 'report':120 'request':52,108 'requir':98 'respons':228 'return':194 'schema':214 'sentiment':127 'settl':54 'simpli':100,180 'specif':62,163 'summar':130 'technic':211 'text':129 'token':139 'unit':83 'usag':216 'usdc':56,85 'usdc api access' 'usdc-base' 'util':13,30,145 'valid':147 'varieti':46 'wallet':206 'web3':134 'x402':2,19,39,103 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"2df7c3d5-6a41-404f-b704-45f6467ffdaf","listingId":"4f705dfd-73cd-45f8-bc47-3e369385ecc7","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:38.847Z"}],"sources":[{"listingId":"4f705dfd-73cd-45f8-bc47-3e369385ecc7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:38.847Z","lastSeenAt":"2026-04-23T04:31:07.801Z"}],"details":{"listingId":"4f705dfd-73cd-45f8-bc47-3e369385ecc7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/47 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/cards/47"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/cards/47"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call API endpoints without needing API key registration","Making micropayment-gated requests settled in USDC on Base","Programmatic agent access to gated premium content via x402 protocol"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before purchasing","Anyone without a Base-compatible USDC wallet","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.744Z"},"updatedAt":"2026-04-23T04:31:07.801Z"}}