{"id":"e15bf2e5-9d70-4a02-adb4-7fd8ca3068bb","shortId":"Vm9Uhb","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering data, 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 market data, and general-purpose 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/104` is listed as \"Premium API Access\" and accepts HTTP POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled on-chain to the provider's wallet. The broader platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse: the /api, /pricing, and /README routes all resolve to a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but without schema details or sample payloads, integrators will need to experiment to discover the expected request body and response format for this particular messages endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-marketplace","llm","finance","geo","utility"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee","crypto API payments"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content","The specific purpose and expected payload of /api/v1/messages/104 is undocumented","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/104","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The specific purpose of /api/v1/messages/104 is unclear beyond the generic label 'Premium API 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'/api/v1/messages/104':100 '/pricing':190 '/readme':192 '/request':19,38 '0.02':18,37,72,131,178 '000':121 '0x8335':126 '20':120 '402':231 '6':135 'Base network API' 'USDC API' 'accept':108 'access':106 'addit':203 'advertis':115 'ai':12,31 'ai-inference' 'ai/ml':57 'also':152 'analysi':157 'analyt':56 'api':5,24,45,87,105 'avail':219 'base':8,27,80,122,128 'beyond':182 'bodi':250 'broad':50 'broader':150 'call':4,23 'chain':143 'challeng':114,232 'classif':160 'collect':51 'commit':95 'confirm':226 'connect':198 'convers':170 'cost':118 'cover':10,29 'crawl':222 'crypto API payments' 'data':11,30,55,61,172 'data-analytics' 'decim':136 'detail':205,236 'discov':246 'document':181,214 'embed':161 'enabl':44 'endpoint':16,35,53,68,98,154,224,258 'equal':130 'estim':167 'everi':67 'exampl':218 'exchang':164 'expect':248 'experi':244 'expos':153 'feed':163 'financ':13,32 'finance-data' 'finance/web3':59 'format':253 'gas':166 'general':64 'general-purpos':63 'generat':173 'geocod':168 'given':132 'http':109 'http-post' 'infer':58 'integr':240 'key':88 'land':184 'limit':91 'list':102 'live':227 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'market':60 'maximum':117 'messag':257 'micropayment API' 'need':242 'network':81 'no-api-key' 'no-rate-limit' 'offer':48 'on-chain':141 'openapi':209 'page':185 'particular':256 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payabl':75 'payload':239 'payment':138 'per':3,22,73 'platform':46,151 'point':180 'post':110 'premium':104 'price':70,162,179 'prompt':200 'proper':230 'protocol':85 'provid':146 'purpos':65 'rate':90,165 'request':74,111,249 'request/response':212 'resolv':195 'respons':252 'return':228 'rout':193 'sampl':238 'schema':213,235 'sentiment':156 'settl':140 'span':54 'spars':187 'spec':210 'specif':97 'suit':6,25 'summar':159 'technic':204 'text':158 'unit':123 'upfront':94 'usag':217 'usdc':9,28,77,125,133 'usdc-base' 'util':15,34,66 'utility-services' 'valid':169 'via':82 'wallet':148,199 'web3-data' 'without':234 'x402':43,84,113 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e9f74d9c-d3a9-49bf-9823-3556b6e3e0f0","listingId":"e15bf2e5-9d70-4a02-adb4-7fd8ca3068bb","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/104","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.749Z"}],"sources":[{"listingId":"e15bf2e5-9d70-4a02-adb4-7fd8ca3068bb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/104","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.749Z","lastSeenAt":"2026-04-22T02:32:05.825Z"}],"details":{"listingId":"e15bf2e5-9d70-4a02-adb4-7fd8ca3068bb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/104 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/104"},{"claim":"All endpoints are priced at $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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/104"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call payment basis without API keys","Fetching real-time crypto token quotes, gas estimates, and exchange rates via micropayments","Running geocoding, validation, or data conversion tasks with no subscription commitment","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["AI agents that need on-demand API access without pre-registration","Developers prototyping with low-cost, no-commitment API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request crypto settlement adds latency overhead","Users who need detailed API documentation and guaranteed SLAs before integration","Applications that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.07Z"},"updatedAt":"2026-04-22T02:32:05.825Z"}}