{"id":"2a3a8384-2f79-454d-9dcf-e6debaebd998","shortId":"3PfgBF","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-enabled API platform that exposes a variety of endpoints across four categories: 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 priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint being listed here — `/api/v1/carts/78` — is described as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 `exact` scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nNote that the `/api/v1/carts/78` path does not clearly map to any of the documented API categories on the landing page (data, AI, finance, infrastructure). It may be a cart or bundle endpoint, or a generic access token. Documentation beyond the landing page is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","json-api"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","micropayment API","USDC API","Base network API","402 payment required"],"warnings":["The /api/v1/carts/78 endpoint is not documented on the landing page and its purpose is unclear — it may be a generic access or bundle endpoint rather than a specific API function.","No OpenAPI spec, request schema, or response schema is available.","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no usable content.","No examples of request bodies or response payloads are available from any source."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/78","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /api/v1/carts/78 path is not explained anywhere. The docs, pricing, and README pages are all blank (wallet-connect only). This is effectively a stub 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'/request':17,34 '0.02':16,33,90,137 '000':126 '0x8335':131 '20':125 '2913':132 '300':153 '402':120 '402 payment required' '6':141 'Base network API' 'USDC API' 'accept':158 'access':116,199 'across':49 'addit':225 'ai':10,27,59,185 'ai-inference' 'analysi':63 'analyt':53 'api':4,21,41,115,178,211 'application/json':163 'avail':240 'base':7,24,98,127,134 'beyond':202 'bundl':194 'cart':192 'categori':51,179 'challeng':121 'classif':66 'classification' 'clear':171 'connect':220 'content':226 'convers':83 'crawl':243 'data':9,26,52,56,184 'data-analytics' 'decim':142 'describ':112 'doc':210 'document':177,201,235 'embed':67 'embeddings' 'enabl':40 'endpoint':14,31,48,86,106,157,195 'equal':136 'estim':77 'exact':149 'exampl':239 'exchang':72 'export':57 'expos':44 'extrem':207 'feed':71 'financ':11,28,68,186 'finance-data' 'four':50 'gas':76 'gate':3,20 'generat':84 'generic':198 'geocod':81 'geocoding' 'given':138 'infrastructur':79,187 'insight':58 'json-api' 'land':182,204 'learn':61 'list':108 'low payment fee' 'lowpaymentfee.com':35 'machin':60 'made':145 'map':172 'materi':244 'may':189 'metric':54 'micropayment API' 'network':99 'note':164 'offer':8,25 'openapi':230 'page':183,205,215 'path':168 'pay-per-call API' 'pay-per-request' 'payabl':93 'payment':143 'per':91 'platform':5,22,42 'post':159 'premium':114 'price':70,88,212 'prompt':222 'protocol':103 'quot':75 'rate':73 'readm':214 'render':217 'report':55 'request':92,122,160 'request/response':233 'return':118,162 'schema':234 'scheme':150 'second':154 'sentiment':62 'sentiment-analysis' 'spec':231 'specif':105 'summar':65 'text':64 'text-summarization' 'thin':208 'timeout':155 'token':74,200 'unit':128 'usag':238 'usdc':95,130,139 'usdc-base' 'util':13,30,80 'valid':82 'varieti':46 'via':100,146 'wallet':221 'web3':69 'x402':2,19,39,102,148 'x402 API' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"56181deb-6b95-48d2-aac7-82afafcc0444","listingId":"2a3a8384-2f79-454d-9dcf-e6debaebd998","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/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:59.651Z"}],"sources":[{"listingId":"2a3a8384-2f79-454d-9dcf-e6debaebd998","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:59.651Z","lastSeenAt":"2026-04-23T14:00:42.691Z"}],"details":{"listingId":"2a3a8384-2f79-454d-9dcf-e6debaebd998","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/78 \\\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":"All endpoints are priced at $0.02 per request, payable on the Base network with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/carts/78 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/carts/78"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-request basis","Running data analytics queries and exporting data with per-call micropayments","Using utility services like geocoding, validation, and conversion without subscription commitments"],"bestFor":["Agents or developers who want keyless, pay-per-use API access","Low-volume or bursty workloads where subscription pricing is wasteful","x402-compatible agents that can settle USDC payments on Base automatically"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.257Z"},"updatedAt":"2026-04-23T14:00:42.691Z"}}