{"id":"b5382c4e-ef79-4228-8624-909b3429bdc8","shortId":"Ub5LXb","kind":"x402","title":"x402-gated API marketplace on Base with $0.02/request USDC pricing and no API keys required.","tagline":"x402-gated API marketplace on Base with $0.02/request USDC pricing and no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Each call costs $0.02 in USDC on the Base network, settled on-chain to the provider's wallet. No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/carts/59` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum amount of 20,000 units of USDC (0x8335… on Base), which at 6 decimals equals $0.02. The response MIME type is application/json. However, the exact functionality of this particular cart endpoint is not documented in the crawled material — the site lists categories like analytics, AI, finance, and utilities, but `/api/v1/carts/59` does not appear among them.\n\nThe broader platform offers endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method"],"categories":["api-marketplace","x402"],"synonyms":["pay per call API","x402 API","USDC API access","Base network API","micropayment API","lowpaymentfee","crypto API gateway"],"warnings":["The /api/v1/carts/59 endpoint is not listed among the site's advertised APIs — its specific function is unclear.","All documentation pages (/docs, /pricing, /README, /api) returned no substantive content, only 'Connect wallet'.","No input or output schema is available; callers cannot know what to send or what to expect back.","The platform's actual service delivery behind these endpoints is unverifiable from the crawl data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/59","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/59","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 captured) and pricing is clear ($0.02 USDC on Base), but the specific /api/v1/carts/59 endpoint has no documentation, no input/output schema, and no examples. All doc pages returned only 'Connect wallet' with no content. The purpose of this particular cart endpoint is 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'/request':10,27 '0.02':9,26,70,145,214 '000':133 '0x8335':137 '20':132 '6':142 'Base network API' 'USDC API access' 'accept':121 'access':51,119 'account':89 'advertis':94,127 'ai':174 'ai/ml':60 'among':183 'amount':130 'analysi':192 'analyt':59,173 'api':4,15,21,32,42,87,118 'appear':182 'application/json':151 'attach':97 'base':7,24,75,139 'broader':186 'call':68 'caller':95 'cart':159 'categori':171 'chain':80 'challeng':126 'classif':195 'connect':225 'content':231 'convers':207 'cost':69 'crawl':166 'crypto API gateway' 'data':58,63 'decim':143 'detail':233 'doc':219 'document':163,217 'embed':196 'endpoint':56,111,160,189 'equal':144 'estim':204 'exact':154 'exchang':199 'feed':198 'financ':175 'finance/web3':62 'function':155 'gas':203 'gate':3,20,50 'generat':209 'geocod':205 'header':102 'howev':152 'infer':61 'json-response' 'key':16,33,88 'like':172 'limit':92 'list':115,170 'lowpaymentfee' 'lowpaymentfee.com':35 'marketplac':5,22 'materi':167 'maximum':129 'micropayment API' 'mime':148 'network':76 'no-api-key' 'offer':188 'on-chain':78 'page':218 'particular':158 'pay':39 'pay per call API' 'pay-per-request':38 'payment':101,107 'per':40 'platform':43,187 'point':216 'post':122 'post-method' 'premium':117 'price':12,29,197,215,220 'prompt':227 'proof':108 'protocol':48 'provid':83 'quot':202 'rate':91,200 'readm':221 'request':41,123 'request/response':234 'requir':17,34 'respons':147 'return':222 'schema':235 'sentiment':191 'servic':66 'settl':77 'simpli':96 'site':169 'span':57 'specif':110 'substant':230 'summar':194 'text':193 'token':201 'type':149 'unavail':237 'unit':134 'usdc':11,28,72,136 'usdc-base' 'use':45 'util':65,177 'valid':105,206 'varieti':54 'wallet':85,226 'x':100 'x-payment':99 'x402':2,19,47,106,125 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"c5e43bb9-4911-48dc-ae64-c2189b1c8e1a","listingId":"b5382c4e-ef79-4228-8624-909b3429bdc8","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:12.895Z"}],"sources":[{"listingId":"b5382c4e-ef79-4228-8624-909b3429bdc8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:12.895Z","lastSeenAt":"2026-04-23T22:01:42.366Z"}],"details":{"listingId":"b5382c4e-ef79-4228-8624-909b3429bdc8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/59 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/carts/59 specifies maxAmountRequired of 20000 units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/carts/59"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages returned only 'Connect wallet' with no substantive 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, per-call billing via x402","Accessing a bundled set of analytics, AI, finance, and utility services through a single payment protocol"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access on Base","x402-compatible clients that can attach USDC payment proofs automatically","Low-volume or exploratory usage where $0.02/call with no commitment is attractive"],"notFor":["High-volume production workloads where per-call crypto payments add latency and cost overhead","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.29Z"},"updatedAt":"2026-04-23T22:01:42.366Z"}}