{"id":"26f6c878-fb70-4a86-bacb-ab727308c3da","shortId":"p6JsBH","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/89` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions 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 listed endpoints share the same $0.02/request pricing. However, the specific functionality behind the `/api/v1/cards/89` path is not documented — the name \"Premium API Access\" is generic and no input/output schema beyond `POST application/json` is provided.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response examples, and no description of what data the `/cards/89` endpoint actually returns. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is difficult to determine its practical utility.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-json","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","402 payment endpoint","crypto-gated API"],"warnings":["The specific functionality of /api/v1/cards/89 is completely undocumented — the name 'Premium API Access' is generic and uninformative.","All documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI spec or request/response examples are available anywhere on the site.","The endpoint path '/cards/89' does not match any of the advertised API categories on the homepage, making its purpose unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/89","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/89","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 with a valid x402 402 challenge, but there is zero documentation on what /api/v1/cards/89 actually does or returns. No OpenAPI spec, no examples, no input/output schema beyond 'POST application/json'. The generic name 'Premium API Access' provides no insight into 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'/api/v1/cards/89':67,164 '/cards/89':222 '/docs':190 '/pricing':192 '/readme':194 '/request':17,34,156 '0.02':16,33,78,155 '000':82 '20':81 '402':234 '402 payment endpoint' '6':88 'Base USDC API' 'access':45,73,173 'actual':224 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,99,115,172 'application/json':182 'base':7,24,61,83 'behind':51,162 'beyond':180 'broader':109 'call':80 'categori':113 'challeng':235 'classif':130 'confirm':229 'connect':200 'content':206 'convers':147 'cost':75 'crypto-gated API' 'data':9,26,116,120,220 'decim':89 'descript':217 'determin':243 'difficult':241 'document':168,185,238 'embed':131 'endpoint':14,31,50,65,151,223,227 'estim':141 'exact':96 'exampl':214 'exchang':136 'export':121 'extrem':187 'feed':135 'financ':11,28,132 'four':112 'function':161 'gas':140 'gate':3,20,44 'generat':148 'generic':175 'geocod':145 'handl':92 'howev':158 'infrastructur':143 'input/output':178 'insight':122 'key':100 'learn':125 'limit':103 'list':69,150 'live':230 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'marketplac':42 'metric':118 'micropay':55 'micropayment API' 'name':170 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':210 'page':195 'path':165 'pay-per-request API' 'payment':90 'per':53,79 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'post':181 'post-json' 'practic':245 'premium':71,171 'price':134,157 'prompt':202 'protocol':40 'provid':184 'quot':139 'rate':102,137 'render':197 'report':119 'request':54 'request/response':213 'requir':107 'return':225,231 'schema':179 'scheme':97 'sentiment':126 'settl':56 'share':152 'spars':188 'spec':211 'specif':64,160 'subscript':106 'summar':129 'text':128 'token':138 'unit':84 'usdc':58,86 'usdc-base' 'util':13,30,144,246 'valid':146,233 'varieti':48 'via':93 'wallet':201 'web3':133 'without':237 'x402':2,19,39,95 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d4994f7f-68b9-4d64-9827-d1eafa9c181e","listingId":"26f6c878-fb70-4a86-bacb-ab727308c3da","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/89","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:53.335Z"}],"sources":[{"listingId":"26f6c878-fb70-4a86-bacb-ab727308c3da","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/89","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:53.335Z","lastSeenAt":"2026-04-23T02:31:11.568Z"}],"details":{"listingId":"26f6c878-fb70-4a86-bacb-ab727308c3da","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/89 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/cards/89"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled instantly on Base L2","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers who want zero-signup, pay-per-call API access","AI agents with x402-compatible wallets on Base","Prototyping workflows that need instant API access without account creation"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who want bulk/subscription pricing","Anyone needing to understand the exact response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.017Z"},"updatedAt":"2026-04-23T02:31:11.568Z"}}