{"id":"aab549fe-04c4-4235-937b-1512aa3ac511","shortId":"VsnCtx","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/carts/36` is listed as \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. No API keys or rate limits are advertised; callers pay per request using USDC on Base.\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 are listed at the same $0.02/request price point.\n\nThe `/api/v1/carts/36` endpoint specifically accepts HTTP POST requests and returns `application/json`. Beyond the x402 challenge metadata, no OpenAPI schema, request body documentation, or response examples are available. The docs, pricing, and API pages behind the site all appear to require a wallet connection and provide no additional textual documentation. The exact functionality behind \"Premium API Access\" on the carts/36 path is unclear — it does not map obviously to any of the named API categories on the landing page.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post","no-api-key"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","base usdc api","pay per call api","lowpaymentfee"],"warnings":["No OpenAPI or request/response schema available — the exact functionality of /api/v1/carts/36 is unknown","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content","The endpoint path '/api/v1/carts/36' does not correspond to any of the named API categories on the landing page; its purpose is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/36","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/carts/36","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 schema, no request/response documentation, and the purpose of the specific /api/v1/carts/36 path is undefined beyond the generic label 'Premium API Access'. Docs pages all resolve to a wallet-connect prompt with no 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'/call':19,38 '/request':156 '0.02':18,37,89,155 '000':78 '0x8335':83 '20':77 '2913':84 '6':87 'accept':163 'access':50,69,214 'addit':205 'advertis':99,111 'ai':12,31,123 'analysi':127 'analyt':117 'api':5,24,48,68,93,190,213,231 'appear':196 'application/json':169 'avail':185 'base':8,27,58,79,86,107 'base usdc api' 'behind':192,211 'beyond':170 'bodi':179 'broader':109 'call':91 'caller':100 'carts/36':217 'categori':113,232 'challeng':173 'classif':130 'collect':42 'connect':201 'convers':147 'data':11,30,116,120 'decim':88 'doc':187 'document':180,207 'embed':131 'endpoint':16,35,49,62,115,161 'estim':141 'exact':209 'exampl':183 'exchang':136 'export':121 'feed':135 'financ':13,32,132 'four':112 'function':210 'gas':140 'generat':148 'geocod':145 'http':164 'http-post' 'infrastructur':143 'insight':122 'json-response' 'key':94 'land':235 'learn':125 'limit':97 'list':65,151 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':124 'map':224 'metadata':174 'metric':118 'micropayment api' 'name':230 'network':59 'no-api-key' 'obvious':225 'offer':40 'openapi':176 'page':191,236 'path':218 'pay':2,21,45,101 'pay per call api' 'pay-per-request':1,20,44 'payment':54,73 'per':3,22,46,90,102 'platform':110 'point':158 'post':165 'premium':67,212 'price':134,157,188 'protocol':55 'provid':203 'quot':139 'rate':96,137 'report':119 'request':4,23,47,103,166,178 'requir':71,198 'respons':182 'return':168 'schema':177 'sentiment':126 'site':194 'specif':61,162 'suit':6,25 'summar':129 'text':128 'textual':206 'token':138 'unclear':220 'unit':80 'usdc':82,105 'usdc-base' 'use':104 'util':15,34,144 'valid':146 'via':9,28,51 'wallet':200 'web3':133 'x402':10,29,53,172 'x402 api' 'x402-payment'","prices":[{"id":"4c081e57-603e-4756-bb3b-420b31a5fca3","listingId":"aab549fe-04c4-4235-937b-1512aa3ac511","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/carts/36","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:00.228Z"}],"sources":[{"listingId":"aab549fe-04c4-4235-937b-1512aa3ac511","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/36","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:00.228Z","lastSeenAt":"2026-04-23T12:05:09.107Z"}],"details":{"listingId":"aab549fe-04c4-4235-937b-1512aa3ac511","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/36 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-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 x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/36"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/36"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.245Z"},"updatedAt":"2026-04-23T12:05:09.107Z"}}