{"id":"7bb77f62-096d-438f-93e9-5823dabd953b","shortId":"2VEwF2","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general-purpose utilities. All endpoints are pay-per-request with no API keys, no rate limits, and no upfront commitments — payment is handled inline via the x402 protocol on the Base network using USDC.\n\nThe specific endpoint at `/api/v1/carts/28` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (the asset at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform also advertises 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/request price point. Documentation pages exist at /docs, /pricing, and /api but currently render only a \"Connect wallet\" prompt with no substantive technical documentation, making it difficult to determine exact request/response schemas or what data sources back each endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","analytics-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 API","pay-per-call API","micropayment API","USDC API","Base network API","data analytics API","AI inference API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no technical content","No OpenAPI or schema available — request and response formats are unknown","The specific endpoint /api/v1/carts/28 labeled 'Premium API Access' does not appear in the site's listed API catalog, making its purpose unclear","Cannot verify what data sources or models back the advertised AI and finance endpoints"],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/28","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/28","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 it is operational. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example requests or responses, and the purpose of the specific /api/v1/carts/28 path is unclear. The listing is essentially a stub with pricing info 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'/api/v1/carts/28':96 '/docs':185 '/pricing':186 '/request':16,32,178 '0.02':15,31,129,177 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':141 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':124 '20':115 '300':144 '6':134 'AI inference API' 'Base network API' 'USDC API' 'accept':104 'access':102 'address':140 'advertis':110,151 'ai':9,25 'ai-inference' 'ai/ml':51 'also':150 'analysi':155 'analyt':8,24,50 'analytics-api' 'api':4,20,39,69,101 'asset':122 'back':214 'base':7,23,88,117,126 'broad':44 'broader':148 'call':131 'challeng':109 'classif':158 'classification' 'collect':45 'commit':77 'connect':194 'convers':170 'conversion' 'cost':113 'crypto-quotes' 'current':190 'data':49,54,212 'data analytics API' 'decim':135 'determin':206 'difficult':204 'document':181,201 'embed':159 'embeddings' 'enabl':38 'endpoint':13,29,47,61,94,152,216 'equal':128 'estim':167 'exact':207 'exchang':162 'exist':183 'feed':161 'financ':10,26 'finance-data' 'finance/web3':53 'gas':166 'gas-estimates' 'gate':3,19 'general':57 'general-purpos':56 'generat':172 'geocod':168 'geocoding' 'handl':80 'infer':52 'inlin':81 'key':70 'limit':73 'list':98 'low payment fee' 'lowpaymentfee.com':33 'make':202 'maximum':112 'micropayment API' 'network':89 'offer':42 'page':182 'pay':64 'pay-per-call API' 'pay-per-request':63 'payment':78,136 'per':65,130 'platform':40,149 'point':180 'post':105 'premium':100 'price':160,179 'prompt':196 'protocol':85 'purpos':58 'quot':165 'rate':72,163 'render':191 'request':66,106 'request/response':208 'schema':209 'second':145 'sent':138 'sentiment':154 'sentiment-analysis' 'sourc':213 'span':48 'specif':93 'substant':199 'suit':5,21 'summar':157 'technic':200 'text':156 'text-summarization' 'timeout':146 'token':164 'unit':118 'upfront':76 'usdc':91,120,132 'usdc-base' 'use':90,133 'util':12,28,59 'valid':169 'validation' 'via':82 'wallet':195 'x402':2,18,37,84,108 'x402 API' 'x402-enabled':36 'x402-gated':1,17 'x402-payment'","prices":[{"id":"69ddf7cc-1329-4fe9-b73f-7c0b234914f4","listingId":"7bb77f62-096d-438f-93e9-5823dabd953b","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/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:23.761Z"}],"sources":[{"listingId":"7bb77f62-096d-438f-93e9-5823dabd953b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:23.761Z","lastSeenAt":"2026-04-23T10:30:30.101Z"}],"details":{"listingId":"7bb77f62-096d-438f-93e9-5823dabd953b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/28 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 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 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/carts/28"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/28"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time crypto token quotes and gas estimates via micropayment","Running geocoding or data validation calls with no subscription commitment","Exporting analytics data or generating reports on a per-request basis"],"bestFor":["AI agents that prefer keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with multiple API categories without signing up for separate services","Web3-native workflows that already hold USDC on Base"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need well-documented request/response schemas before integrating","Teams without USDC on Base or unfamiliar with x402 payment flows"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.077Z"},"updatedAt":"2026-04-23T10:30:30.101Z"}}