{"id":"5034f5ca-9304-4abe-b7df-e2379f8ca976","shortId":"KYJzUX","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 platform that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/accounts/86` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The 402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\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 $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The specific functionality of the `/api/v1/accounts/86` endpoint is unclear beyond its generic \"Premium API Access\" label. Without documentation or schema details, it is difficult to determine what data this endpoint returns or what input it expects.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-platform","data"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-request API","USDC API access","Base network API","402 payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific function of /api/v1/accounts/86 ('Premium API Access') is not documented anywhere","Cannot verify what data or service this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/accounts/86","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/accounts/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet connect prompt. The specific purpose of /api/v1/accounts/86 is 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'/request':17,34 '0.02':16,33,103,157 '000':92 '0x8335':97 '20':91 '2913':98 '402':84 '402 payment API' '6':109 'Base network API' 'USDC API access' 'accept':73 'access':45,71,224 'addit':192 'advertis':114 'ai':10,27,126 'amount':89 'analysi':130 'analyt':120 'api':4,21,41,70,118,162,178,223 'base':7,24,59,93,100 'base-network' 'behind':51 'beyond':219 'broader':112 'categori':116 'challeng':85 'classif':133 'commit':170 'connect':187 'content':194 'convers':150 'data':9,26,119,123,237 'decim':110 'detail':205,230 'determin':235 'difficult':233 'doc':177 'document':172,206,227 'embed':134 'endpoint':14,31,50,63,153,209,216,239 'equal':102 'estim':144 'exact':81 'exampl':202 'exchang':139 'expect':245 'export':124 'extrem':174 'feed':138 'financ':11,28,135 'four':115 'function':212 'gas':143 'gate':3,20,44 'generat':151 'generic':221 'geocod':148 'given':106 'indic':86 'infrastructur':146 'input':243 'insight':125 'json-response' 'key':163 'label':225 'learn':128 'limit':166 'list':67,155 'low payment fee' 'lowpaymentfee.com':35 'machin':127 'max':88 'metric':121 'micropay':56 'micropayment API' 'minimum':169 'network':60 'no-api-key' 'offer':8,25 'openapi':198 'page':182 'pay-per-request API' 'payment':77 'per':53,104,158 'per-request':52 'per-request-billing' 'platform':5,22,42,113 'post':74 'post-endpoint' 'premium':69,222 'price':137,179 'prompt':189 'protocol':40 'quot':142 'rate':140,165 'readm':181 'render':184 'report':122 'request':54,75,105,159 'request/response':201 'requir':171 'return':240 'schema':199,229 'scheme':82 'sentiment':129 'spars':175 'specif':62,211 'summar':132 'technic':193 'text':131 'token':141 'unclear':218 'unit':94 'usdc':55,96,107 'usdc-micropayment' 'util':13,30,147 'valid':149 'varieti':48 'via':78 'wallet':188 'web3':136 'without':226 'x402':2,19,39,80 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"3ecd3812-b8df-406d-996d-71bd95f5a378","listingId":"5034f5ca-9304-4abe-b7df-e2379f8ca976","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/accounts/86","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:40:14.006Z"}],"sources":[{"listingId":"5034f5ca-9304-4abe-b7df-e2379f8ca976","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/accounts/86","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:40:14.006Z","lastSeenAt":"2026-04-24T19:03:43.048Z"}],"details":{"listingId":"5034f5ca-9304-4abe-b7df-e2379f8ca976","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with USDC on Base.\n# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/accounts/86\n# 2. Parse the 402 JSON, construct payment proof, then resend with:\n# X-PAYMENT: <signed-payment-header>","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","source_url":"https://lowpaymentfee.com/api/v1/accounts/86"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/accounts/86"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"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 endpoints"],"bestFor":["Developers wanting keyless, pay-per-request 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 integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:36.707Z"},"updatedAt":"2026-04-24T19:03:43.048Z"}}