{"id":"fe8a6cb3-e7e1-445d-9fd4-2ad511af201c","shortId":"6VhxMq","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 marketplace that exposes a variety of endpoints across four categories: Data & Analytics (metrics, reports, 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 pay-per-call at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/carts/55` is listed as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20000 (in USDC atomic units, which equals $0.02 given USDC's 6 decimals). Payment is made via the x402 exact scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The endpoint accepts HTTP POST requests.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/carts/55` endpoint actually returns. The site advertises no API keys, no rate limits, and instant access, but the actual behavior and response format of this specific endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","http-post","json-response"],"categories":["api-marketplace","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC API access","Base network API","pay-per-call API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific endpoint /api/v1/carts/55 purpose is unclear — 'Premium API Access' is a generic label","Cannot verify what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/55","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/55","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 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what /api/v1/carts/55 actually does beyond the generic label 'Premium API Access'. The docs pages are empty wallet-connect 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'/request':17,34 '0.02':16,33,92,130 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':146 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':149 '20000':123 '6':134 'Base network API' 'USDC API access' 'accept':154 'access':112,209 'across':49 'actual':196,212 'addit':178 'address':145 'advertis':200 'ai':10,27,58 'analysi':62 'analyt':53 'api':4,21,41,111,164,202 'atom':126 'base':7,24,100,151 'behavior':213 'call':90 'categori':51 'challeng':118 'classif':65 'connect':173 'content':179 'convers':82 'data':9,26,52 'decim':135 'descript':190 'doc':163 'document':158 'embed':66 'enabl':40 'endpoint':14,31,48,85,104,153,195,220 'equal':129 'estim':76 'exact':142 'exampl':187 'exchang':71 'export':56 'expos':44 'extrem':160 'feed':70 'financ':11,28,67 'format':216 'four':50 'gas':75 'gate':3,20 'generat':83 'geocod':80 'given':131 'http':155 'http-post' 'infrastructur':78 'insight':57 'instant':208 'json-response' 'key':203 'learn':60 'limit':206 'list':108 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':59 'made':138 'marketplac':42 'maxamountrequir':121 'metric':54 'micropayment API' 'network':101 'offer':8,25 'openapi':183 'page':168 'pay':88 'pay-per-cal':87 'pay-per-call API' 'pay-per-request' 'payment':136 'per':89,93 'platform':5,22 'post':156 'premium':110 'price':69,165 'prompt':175 'quot':74 'rate':72,205 'readm':167 'remain':221 'render':170 'report':55 'request':94,157 'request/response':186 'respons':215 'return':114,197 'schema':184 'scheme':143 'sentiment':61 'settl':95 'site':199 'spars':161 'specif':103,219 'summar':64 'text':63 'token':73 'unit':127 'unknown':222 'usdc':97,125,132,148 'usdc-on-base' 'use':147 'util':13,30,79 'valid':81,116 'varieti':46 'via':139 'wallet':174 'web3':68 'x402':2,19,39,117,141 'x402 API' 'x402-enabled':38 'x402-gated':1,18 'x402-payment'","prices":[{"id":"b0cd4b03-0e6c-4036-a0b0-0d4e25355198","listingId":"fe8a6cb3-e7e1-445d-9fd4-2ad511af201c","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:12.342Z"}],"sources":[{"listingId":"fe8a6cb3-e7e1-445d-9fd4-2ad511af201c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:12.342Z","lastSeenAt":"2026-04-23T22:01:42.347Z"}],"details":{"listingId":"fe8a6cb3-e7e1-445d-9fd4-2ad511af201c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/55 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 USDC atomic units, payTo 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3, asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/55"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API endpoints without API keys or subscriptions","Agent-driven pay-per-call workflows using x402 and USDC on Base","Accessing data, AI, finance, or utility services with per-request micropayments"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.319Z"},"updatedAt":"2026-04-23T22:01:42.347Z"}}