{"id":"333c52fb-de31-42dd-bf51-e3d05fe65970","shortId":"9EbFqy","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 at `/api/v1/carts/60` is labeled \"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. Payment is settled on-chain with no API keys, no rate limits, and no subscriptions required.\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 listed endpoints share the same $0.02/request pricing. The x402 challenge was successfully captured on the `/api/v1/carts/60` endpoint, confirming it is live and accepting POST requests.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality behind the \"Premium API Access\" label at `/api/v1/carts/60` is unclear; it may be a cart or e-commerce related endpoint, but this is not documented.","tags":[],"capabilities":["x402-payment","pay-per-request","base-network","usdc-settlement","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["x402 API","pay per call API","micropayment API","Base USDC API","lowpaymentfee","on-chain API payment","402 payment required API"],"warnings":["No OpenAPI spec or request/response schema available for any endpoint","Documentation pages (/docs, /api, /pricing, /README) are empty beyond a wallet-connect prompt","The specific functionality of /api/v1/carts/60 ('Premium API Access') is not documented — unclear what it returns","The breadth of advertised endpoints (AI, finance, data, utils) could not be independently verified beyond the landing page listing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/60","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is zero documentation for request/response schemas, no OpenAPI spec, and the specific purpose of the /api/v1/carts/60 endpoint is undocumented. All secondary pages return only a wallet-connect prompt. This is effectively a stub 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'/api/v1/carts/60':64,167,228 '/call':19,38 '/docs':186 '/pricing':188 '/readme':190 '/request':157 '0.02':18,37,89,156 '000':78 '0x8335':83 '20':77 '2913':84 '402 payment required API' '6':87 'Base USDC API' 'accept':174 'access':50,69,225 'advertis':112 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':118 'api':5,24,48,68,100,224 'avail':217 'base':8,27,58,79,86 'base-network' 'behind':221 'beyond':178 'broader':110 'call':91 'captur':164 'cart':235 'categori':114 'chain':97 'challeng':161 'classif':131 'collect':42 'commerc':239 'confirm':169 'connect':196 'convers':148 'data':11,30,117,121 'data-analytics' 'decim':88 'detail':203 'document':177,212,246 'e':238 'e-commerc':237 'embed':132 'embeddings' 'endpoint':16,35,49,62,116,152,168,241 'estim':142 'exact':219 'exampl':215 'exchang':137 'export':122 'extrem':183 'feed':136 'financ':13,32,133 'finance-data' 'four':113 'function':220 'gas':141 'generat':149 'geocod':146 'geocoding' 'infrastructur':144 'insight':123 'key':101 'label':66,226 'land':180 'learn':126 'limit':104 'list':151 'live':172 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':125 'may':232 'metric':119 'micropayment API' 'network':59 'no-api-key' 'offer':40 'on-chain':95 'on-chain API payment' 'openapi':207 'page':181,191 'pay':2,21,45 'pay per call API' 'pay-per-request':1,20,44 'payload':216 'payment':54,73,92 'per':3,22,46,90 'platform':111 'post':175 'premium':67,223 'price':135,158 'prompt':198 'protocol':55 'quot':140 'rate':103,138 'relat':240 'render':193 'report':120 'request':4,23,47,176 'request/response':210 'requir':71,108 'schema':211 'sentiment':127 'sentiment-analysis' 'settl':94 'share':153 'spars':184 'spec':208 'specif':61 'subscript':107 'success':163 'suit':6,25 'summar':130 'technic':202 'text':129 'text-summarization' 'token':139 'unclear':230 'unit':80 'usdc':82 'usdc-settlement' 'util':15,34,145 'utility-apis' 'valid':147 'via':9,28,51 'wallet':197 'web3':134 'x402':10,29,53,160 'x402 API' 'x402-payment'","prices":[{"id":"7ae30df6-d8d9-4767-9ece-a8970ac2c9ed","listingId":"333c52fb-de31-42dd-bf51-e3d05fe65970","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/60","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:45.802Z"}],"sources":[{"listingId":"333c52fb-de31-42dd-bf51-e3d05fe65970","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/60","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:45.802Z","lastSeenAt":"2026-04-23T18:03:21.161Z"}],"details":{"listingId":"333c52fb-de31-42dd-bf51-e3d05fe65970","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/60 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/carts/60"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/carts/60"},{"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 advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-request basis","Running utility operations like geocoding or data validation with instant crypto-settled payments","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Crypto-native applications that can settle USDC on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs, rate-limit guarantees, or support contracts","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.788Z"},"updatedAt":"2026-04-23T18:03:21.161Z"}}