{"id":"416be648-4b2a-4c26-860e-81d0b30a4435","shortId":"bYMvgf","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/carts/82` is listed as \"Premium API Access\" and requires a maximum payment of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) per call via the x402 exact payment scheme.\n\nThe 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\nThe specific endpoint `/api/v1/carts/82` does not have a clear description beyond \"Premium API Access,\" and the crawled documentation pages (docs, api, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available. The endpoint is confirmed live via a valid 402 challenge response, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee"],"warnings":["No OpenAPI schema or detailed documentation available — all doc pages return only 'Connect wallet'","The specific functionality of /api/v1/carts/82 ('Premium API Access') is not described anywhere","No request body schema or response schema is documented","Cannot verify what data or service is actually delivered upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/82","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/82","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 via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and the actual functionality behind '/api/v1/carts/82' is entirely opaque. The listing is effectively a 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'/request':17,34 '0.02':16,33,85,145 '000':80 '20':79 '402':215 '6':90 'Base network API' 'USDC API access' 'access':44,72,173 'actual':221 'advertis':102 'ai':10,27,114 'analysi':118 'analyt':108 'api':4,21,40,71,106,150,172,180 'avail':206 'base':7,24,60,81 'base-network' 'behind':50 'beyond':170 'call':93 'categori':104 'challeng':216 'classif':121 'clear':168 'commit':158 'confirm':210 'connect':187 'content':193 'convers':138 'crawl':176 'data':9,26,107,111 'decim':91 'descript':169 'detail':204 'doc':179 'document':177,205 'embed':122 'endpoint':14,31,49,64,141,162,208 'estim':132 'exact':97 'exampl':201 'exchang':127 'export':112 'feed':126 'financ':11,28,123 'four':103 'gas':131 'gate':3,20,43 'generat':139 'geocod':136 'infrastructur':134 'insight':113 'json-response' 'key':151 'learn':116 'limit':154 'list':68,143 'live':211 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':115 'marketplac':41 'maximum':76 'metric':109 'micropay':54 'micropayment API' 'minimum':157 'network':61 'no-api-key' 'offer':8,25 'openapi':197 'page':178 'pay-per-request API' 'payment':77,98,225 'per':52,92,146 'per-request':51 'per-request-billing' 'platform':5,22,101 'premium':70,171 'price':125,181 'prompt':189 'protocol':39 'quot':130 'rate':128,153 'readm':182 'report':110 'request':53,147 'request/response':200 'requir':74,159 'respons':217 'return':184,222 'schema':198 'scheme':99 'sentiment':117 'settl':55 'sinc':87 'specif':63,161 'substant':192 'success':224 'summar':120 'text':119 'token':129 'unit':82 'unknown':227 'upon':223 'usd':86 'usdc':57,84,88 'usdc-micropayment' 'use':89 'util':13,30,135 'valid':137,214 'varieti':47 'via':94,212 'wallet':188 'web3':124 'x402':2,19,38,96 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"d2fd898c-923f-47f0-822c-27d6e81f680b","listingId":"416be648-4b2a-4c26-860e-81d0b30a4435","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:09.445Z"}],"sources":[{"listingId":"416be648-4b2a-4c26-860e-81d0b30a4435","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:09.445Z","lastSeenAt":"2026-04-23T16:30:38.823Z"}],"details":{"listingId":"416be648-4b2a-4c26-860e-81d0b30a4435","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# 1. POST to the endpoint without payment to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/carts/82\n# 2. Parse the 402 response, construct an X-PAYMENT header with\n#    a signed USDC transfer of 0.02 USD to 0x1A2B...85F3,\n#    then retry with the header attached.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/82"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure 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 zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before purchasing","High-volume consumers who need bulk pricing or rate guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.676Z"},"updatedAt":"2026-04-23T16:30:38.823Z"}}