{"id":"c9accc5f-e718-421b-a4b1-566f6b02fb2b","shortId":"J3mq7D","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 infrastructure utilities. Every endpoint is priced at $0.02 per request, payable in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/messages/41` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST requests and returns application/json. Beyond this particular path, the platform 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 minimal: the landing page lists available endpoints with brief labels and prices, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The /api, /pricing, and /README pages all resolve to a bare \"Connect wallet\" prompt with no additional content. As a result, the exact request body format and response structure for `/api/v1/messages/41` (and the other endpoints) must be discovered experimentally.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas-estimates","geocoding","data-export","validation","conversion"],"categories":["llm","search","geo","finance"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","cheap api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","The /api, /pricing, and /README pages contain no useful content (just 'Connect wallet')","The specific function of /api/v1/messages/41 is undocumented; 'Premium API Access' is a generic label","Cannot verify that the advertised AI, finance, and utility endpoints actually return meaningful data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/41","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/messages/41","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 accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no usage examples, and the docs pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/messages/41 is unclear beyond the generic label 'Premium API 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'/api/v1/messages/41':96,230 '/pricing':202 '/readme':204 '/request':18,36 '0.02':17,35,68,121,169 '000':111 '0x8335':116 '20':110 '402 payment api' '6':125 'accept':129 'access':102 'addit':216 'advertis':106,142 'ai':12,30 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':146 'analyt':11,29,54 'api':5,23,43,83,101 'application/json':135 'avail':179 'bare':210 'base':8,26,76,112,118 'base network api' 'beyond':136 'bodi':224 'brief':182 'broad':48 'call':4,22 'challeng':105 'cheap api' 'classif':149 'collect':49 'commit':91 'connect':211 'content':217 'convers':161 'conversion' 'cover':10,28 'crypto-gas-estimates' 'data':53,58,163 'data-analytics' 'data-export' 'decim':126 'discov':237 'document':172,195 'embed':150 'enabl':42 'endpoint':51,64,94,128,143,180,234 'equal':120 'estim':158 'everi':63 'exact':222 'exampl':199 'exchang':153 'exchange-rates' 'experiment':238 'feed':152 'financ':13,31 'finance-prices' 'finance/web3':57 'format':225 'gas':157 'general':60 'generat':164 'geocod':159 'geocoding' 'given':122 'http':130 'infer':56 'infrastructur':61 'key':84 'label':183 'land':176 'limit':87 'list':98,178 'low payment fee' 'lowpaymentfee.com':37 'maxamountrequir':108 'micropayment api' 'minim':174 'must':235 'network':77 'offer':46 'openapi':190 'page':177,205 'particular':138 'path':139 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payabl':71 'per':3,21,69 'platform':44,141 'point':171 'post':131 'premium':100 'price':66,151,170,185 'prompt':213 'protocol':81 'quot':156 'rate':86,154 'request':70,132,223 'request/response':193 'resolv':207 'respons':227 'result':220 'return':134 'schema':194 'sentiment':145 'span':52 'spec':191 'specif':93 'structur':228 'suit':6,24 'summar':148 'text':147 'token':155 'unit':113 'upfront':90 'usag':198 'usdc':9,27,73,115,123 'usdc api' 'usdc-base' 'util':15,33,62 'valid':160 'validation' 'via':78 'wallet':212 'x402':41,80,104 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"963eb9fd-6bd0-48f9-8366-4fc624ce4d2d","listingId":"c9accc5f-e718-421b-a4b1-566f6b02fb2b","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/messages/41","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:27.148Z"}],"sources":[{"listingId":"c9accc5f-e718-421b-a4b1-566f6b02fb2b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/41","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:27.148Z","lastSeenAt":"2026-04-22T02:32:08.205Z"}],"details":{"listingId":"c9accc5f-e718-421b-a4b1-566f6b02fb2b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/41 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{\"message\": \"hello\"}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/messages/41 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/41"}],"useCases":["Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis without API key management","Fetching real-time crypto token quotes, gas estimates, and exchange rates","Geocoding addresses or validating/converting data via utility endpoints","Exporting data or generating analytics reports on demand","Integrating pay-per-use endpoints into autonomous agent workflows via x402"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle payments autonomously via x402 on Base","Projects needing a variety of lightweight utility and AI endpoints at uniform low cost"],"notFor":["Production workloads requiring detailed SLAs, rate-limit guarantees, or uptime commitments","Users who need comprehensive API documentation and typed schemas before integration","Applications requiring high-throughput bulk processing at volume-discounted rates"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:59.954Z"},"updatedAt":"2026-04-22T02:32:08.205Z"}}