{"id":"83ebd893-ae8a-4214-b473-aa723ae841cd","shortId":"sudffc","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities 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. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/charges/400` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. The platform also advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind each endpoint is unclear beyond the short labels on the landing page, so callers should expect to experiment or contact the provider for details.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","analytics-api","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","data-export","validation","conversion"],"categories":["ai","finance","geo","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","sentiment analysis api","text summarization api","crypto price feed"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content.","No OpenAPI or JSON schema describing request parameters or response format for any endpoint.","The specific purpose of /api/v1/charges/400 ('Premium API Access') is unclear — it may be a generic test/demo endpoint.","Functionality of all advertised endpoints (AI, finance, analytics, utils) is unverifiable from available crawl data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/400","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/charges/400","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The actual functionality behind 'Premium API Access' and other listed endpoints is 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'/api/v1/charges/400':105 '/docs':168 '/pricing':169 '/readme':172 '/request':18,36 '0.02':17,35,69,127,160 '000':121 '20':120 'access':111 'actual':203 'advertis':133 'ai':12,30 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'also':132 'analysi':137 'analyt':11,29,54 'analytics-api' 'api':5,23,43,82,110 'attach':93 'avail':198 'base':8,26,77,122,129 'base network api' 'behind':205 'beyond':210 'broad':48 'call':4,22 'caller':91,219 'challeng':116 'classif':140 'collect':49 'commit':90 'connect':178 'contact':225 'content':184 'convers':152 'conversion' 'cover':10,28 'crawl':201 'crypto price feed' 'crypto-gas' 'data':53,58,154 'data-export' 'detail':229 'document':163,193 'embed':141 'enabl':42 'endpoint':51,65,103,134,207 'estim':149 'everi':64 'exampl':197 'exchang':144 'exchange-rates' 'expect':221 'experi':223 'extrem':165 'feed':143 'financ':13,31 'finance-prices' 'finance/web3':57 'function':204 'gas':148 'general':61 'general-purpos':60 'generat':155 'geocod':150 'geocoding' 'header':97 'i.e':126 'infer':56 'key':83 'label':213 'land':216 'limit':86 'list':107 'low payment fee' 'lowpaymentfee.com':37 'micropayment api' 'minimum':89 'network':78 'offer':46 'openapi':188 'page':173,217 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':96 'per':3,21,70 'platform':44,131 'point':162 'premium':109 'price':67,142,161 'prompt':180 'provid':227 'purpos':62 'quot':147 'rate':85,145 'render':175 'request':71,100,117 'request/response':191 'return':113 'schema':192 'sentiment':136 'sentiment analysis api' 'settl':72 'short':212 'simpli':92 'span':52 'spec':189 'specif':102 'suit':6,24 'summar':139 'text':138 'text summarization api' 'thin':166 'token':146 'unclear':209 'unit':123 'usag':196 'usdc':9,27,74,125 'usdc api' 'usdc-base' 'util':15,33,63 'valid':151 'validation' 'wallet':179 'x402':41,95,115 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"b3b4bc9e-0e9e-4e88-8741-013ee403ce97","listingId":"83ebd893-ae8a-4214-b473-aa723ae841cd","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/charges/400","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:22.934Z"}],"sources":[{"listingId":"83ebd893-ae8a-4214-b473-aa723ae841cd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/400","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:22.934Z","lastSeenAt":"2026-04-22T16:31:17.447Z"}],"details":{"listingId":"83ebd893-ae8a-4214-b473-aa723ae841cd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/400 \\\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":"The endpoint returns an x402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/charges/400"},{"claim":"All 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 offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/charges/400"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding addresses or validating data on a per-request payment basis","Exporting analytics data or generating insights with no rate limits","Embedding text for search or ML pipelines at $0.02 per call"],"bestFor":["Agents or bots that need keyless, pay-as-you-go API access","Developers prototyping with multiple utility endpoints under one provider","Web3-native workflows already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.758Z"},"updatedAt":"2026-04-22T16:31:17.447Z"}}