{"id":"bb641c6e-a0ea-47f7-a470-1bd9feb871d4","shortId":"UfFCrs","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/65` 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 — no API keys, no rate limits, and no upfront commitments are required.\n\nThe broader platform advertises four categories of endpoints: 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. The endpoint accepts HTTP POST requests and returns application/json responses.\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 schema documentation, and no usage examples available from the crawled material. The specific functionality behind `/api/v1/cards/65` is unclear beyond its generic \"Premium API Access\" label, making it difficult to determine what data or service it actually returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-request API","Base USDC API","402 payment API"],"warnings":["No OpenAPI or schema documentation available — the docs, API, pricing, and README pages all show only 'Connect wallet' with no technical content.","The specific purpose of /api/v1/cards/65 ('Premium API Access') is undefined — it is unclear what data or service this endpoint provides.","No request body schema or response schema is documented anywhere in the crawled material.","The platform lists many endpoint categories (AI, finance, data, infrastructure) but provides no evidence these endpoints actually function or what they return."],"endpointUrl":"https://lowpaymentfee.com/api/v1/cards/65","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of /api/v1/cards/65 is entirely opaque. This is effectively a stub 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'/request':17,34,156 '0.02':16,33,76,155 '000':80 '20':79 '402 payment API' '6':86 'Base USDC API' 'accept':160 'access':45,73,221 'actual':233 'advertis':111 'ai':10,27,123 'analysi':127 'analyt':117 'api':4,21,41,72,97,174,220 'application/json':166 'avail':204 'base':7,24,61,81 'behind':51,212 'beyond':216 'broader':109 'call':78 'categori':113 'classif':130 'commit':105 'connect':183 'convers':147 'cost':75 'crawl':207 'data':9,26,116,120,229 'decim':87 'detail':190 'determin':227 'difficult':225 'doc':173 'document':168,199 'embed':131 'endpoint':14,31,50,65,115,151,159 'estim':141 'exact':94 'exampl':203 'exchang':136 'export':121 'extrem':170 'feed':135 'financ':11,28,132 'four':112 'function':211 'gas':140 'gate':3,20,44 'generat':148 'generic':218 'geocod':145 'handl':90 'http':161 'http-post' 'infrastructur':143 'insight':122 'json-response' 'key':98 'label':222 'learn':125 'limit':101 'list':69,150 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'make':223 'marketplac':42 'materi':208 'metric':118 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':194 'page':178 'pay-per-request API' 'payment':88 'per':53,77 'per-request':52 'per-request-micropayment' 'platform':5,22,110 'post':162 'premium':71,219 'price':134,157,175 'prompt':185 'protocol':40 'quot':139 'rate':100,137 'readm':177 'render':180 'report':119 'request':54,163 'request/response':197 'requir':107 'respons':167 'return':165,234 'schema':198 'scheme':95 'sentiment':126 'servic':231 'settl':56 'share':152 'spars':171 'spec':195 'specif':64,210 'summar':129 'technic':189 'text':128 'token':138 'unclear':215 'unit':82 'upfront':104 'usag':202 'usdc':58,84 'usdc-base' 'util':13,30,144 'valid':146 'varieti':48 'via':91 'wallet':184 'web3':133 'x402':2,19,39,93 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"decda1d6-053a-4eef-b34b-b827c0f0e977","listingId":"bb641c6e-a0ea-47f7-a470-1bd9feb871d4","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:43:45.494Z"}],"sources":[{"listingId":"bb641c6e-a0ea-47f7-a470-1bd9feb871d4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/cards/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:43:45.494Z","lastSeenAt":"2026-04-23T02:31:11.118Z"}],"details":{"listingId":"bb641c6e-a0ea-47f7-a470-1bd9feb871d4","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base, $0.02/call)\ncurl -X POST https://lowpaymentfee.com/api/v1/cards/65 \\\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, with maxAmountRequired of 20000 in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/cards/65"},{"claim":"All listed endpoints are priced at $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":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to paid API endpoints without managing API keys or subscriptions","Agent-driven workflows that need on-demand, pay-as-you-go API calls settled in crypto","Exploring x402 protocol integration for micropayment-gated services"],"bestFor":["Developers wanting zero-friction, keyless API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-per-call pricing over subscription models"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-compatible wallet or USDC holdings","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:26.37Z"},"updatedAt":"2026-04-23T02:31:11.118Z"}}