{"id":"ff2033f2-694f-431b-849f-0c8925e6b625","shortId":"E2ZsUc","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/23` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header to each request, and no API keys, rate limits, or upfront commitments are required.\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 listed endpoints share the same $0.02/request pricing. However, the specific functionality behind `/api/v1/cards/23` is not documented beyond the generic \"Premium API Access\" label, so its exact input/output behavior is unclear.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response examples, and no description of what the `/cards/23` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is difficult to know what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","no-api-key","json-response","http-post"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","Base USDC API","cards endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all show only 'Connect wallet' with no technical content.","The specific purpose and response format of /api/v1/cards/23 ('Premium API Access') is undocumented; its actual functionality is unknown.","No OpenAPI schema or request/response examples are provided anywhere on the site.","No robots.txt or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/23","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/23","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 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — no OpenAPI spec, no request/response examples, and no description of what /api/v1/cards/23 actually does. The listing is effectively a 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'/api/v1/cards/23':67,171 '/cards/23':226 '/docs':194 '/pricing':196 '/readme':198 '/request':17,34,164 '0.02':16,33,76,163 '000':80 '20':79 '402':238 '6':86 'Base USDC API' 'access':45,73,180 'actual':228 'advertis':120 'ai':10,27,131 'analysi':135 'analyt':125 'api':4,21,41,72,108,179 'attach':97 'base':7,24,61,81 'behavior':186 'behind':51,170 'beyond':175 'broader':118 'call':78 'caller':96 'cards endpoint' 'categori':123 'challeng':239 'classif':138 'commit':114 'confirm':233 'connect':204 'convers':155 'cost':75 'data':9,26,124,128,249 'decim':87 'descript':222 'detail':211 'difficult':245 'document':174,189,242 'embed':139 'endpoint':14,31,50,65,122,159,227,231 'estim':149 'exact':94,184 'exampl':219 'exchang':144 'export':129 'extrem':191 'feed':143 'financ':11,28,140 'four':121 'function':169 'gas':148 'gate':3,20,44 'generat':156 'generic':177 'geocod':153 'handl':90 'header':102 'howev':166 'http-post' 'infrastructur':151 'input/output':185 'insight':130 'json-response' 'key':109 'know':247 'label':181 'learn':133 'limit':111 'list':69,158 'live':234 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':132 'marketplac':42 'metric':126 'micropay':55 'network':62 'no-api-key' 'offer':8,25 'openapi':215 'page':199 'pay-per-request API' 'payment':88,101 'per':53,77 'per-request':52 'per-request-micropayment' 'platform':5,22,119 'premium':71,178 'price':142,165 'prompt':206 'proper':237 'protocol':40 'provid':253 'quot':147 'rate':110,145 'render':201 'report':127 'request':54,105 'request/response':218 'requir':116 'return':229,235 'scheme':95 'sentiment':134 'servic':251 'settl':56 'share':160 'spars':192 'spec':216 'specif':64,168 'summar':137 'technic':210 'text':136 'token':146 'unclear':188 'unit':82 'upfront':113 'usdc':58,84 'usdc-base' 'util':13,30,152 'valid':154 'varieti':48 'via':91 'wallet':205 'web3':141 'without':241 'x':100 'x-payment':99 'x402':2,19,39,93 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"bc134217-61df-4075-90db-1538f8303e02","listingId":"ff2033f2-694f-431b-849f-0c8925e6b625","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:23.775Z"}],"sources":[{"listingId":"ff2033f2-694f-431b-849f-0c8925e6b625","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:23.775Z","lastSeenAt":"2026-04-23T04:01:13.703Z"}],"details":{"listingId":"ff2033f2-694f-431b-849f-0c8925e6b625","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/cards/23 \\\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 x402Version 1, exact scheme, on Base network, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (USDC), maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/cards/23"},{"claim":"All listed endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Pay-as-you-go access to data, AI, finance, or utility services"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:27.374Z"},"updatedAt":"2026-04-23T04:01:13.703Z"}}