{"id":"c60118b2-5145-4a3d-a2ca-331feaa0c288","shortId":"3YFTUX","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering AI, analytics, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering AI, analytics, 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 utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/messages/105` is listed as \"Premium API Access.\" Its x402 challenge confirms it is live and accepts exact-scheme payments of up to 20,000 base units of USDC (0x8335…) on Base, which equals $0.02 (USDC uses 6 decimals). The endpoint expects HTTP POST and returns `application/json`. Beyond the generic label, no further documentation describes what this particular messages endpoint does — the provider's landing page does not list it among its publicly catalogued APIs.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export, all at the same $0.02 price point. However, crawled documentation pages (/api, /pricing, /README) returned only a \"Connect wallet\" prompt with no additional technical detail, so request/response schemas for any endpoint — including this one — are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No documentation available for this specific endpoint — its purpose and expected input/output are unknown.","The /api/v1/messages/105 path is not listed among the provider's publicly catalogued APIs, raising questions about its intended use.","No OpenAPI spec, request schema, or response schema is available for any endpoint on this platform.","Crawled /api, /pricing, and /README pages contained no meaningful content beyond 'Connect wallet'."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/105","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/105","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/messages/105' is entirely opaque. The crawled docs pages returned only wallet-connect prompts with no useful 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'/api/v1/messages/105':100 '/pricing':211 '/readme':212 '/request':18,36 '0.02':17,35,67,134,203 '000':124 '0x8335':129 '20':123 '6':137 'accept':115 'access':106 'account':80 'addit':221 'advertis':85,178 'ai':11,29 'ai/ml':55 'among':170 'analysi':182 'analyt':12,30,54 'api':5,23,43,78,105,174 'application/json':146 'attach':88 'base':8,26,75,125,131 'base network api' 'beyond':147 'broad':48 'broader':176 'call':4,22 'caller':86 'catalogu':173 'challeng':109 'classif':185 'collect':49 'confirm':110 'connect':216 'convers':195 'cover':10,28 'crawl':207 'data':53,58,197 'decim':138 'describ':154 'detail':223 'document':153,208 'embed':186 'enabl':42 'endpoint':51,63,98,140,159,179,229 'equal':133 'estim':192 'everi':62 'exact':117 'exact-schem':116 'exchang':189 'expect':141 'export':198 'feed':188 'financ':13,31 'finance/web3':57 'gas':191 'general':60 'generic':149 'geocod':193 'header':92 'howev':206 'http':142 'includ':230 'infer':56 'json-api' 'key':79 'label':150 'land':164 'limit':83 'list':102,168 'live':113 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':37 'messag':158 'micropayment api' 'network':76 'no-api-key' 'offer':46 'one':232 'page':165,209 'particular':157 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':91,119 'per':3,21,68 'platform':44,177 'point':205 'post':143 'post-method' 'premium':104 'price':65,187,204 'prompt':218 'provid':162 'public':172 'rate':82,190 'request':69,95 'request/response':225 'return':145,213 'schema':226 'scheme':118 'sentiment':181 'settl':70 'simpli':87 'span':52 'specif':97 'suit':6,24 'summar':184 'technic':222 'text':183 'unit':126 'unknown':234 'usdc':9,27,72,128,135 'usdc api' 'usdc-base' 'use':136 'util':15,33,61 'valid':194 'wallet':217 'x402':41,90,108 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"f75de624-6737-4e1b-81dd-9ab37e070382","listingId":"c60118b2-5145-4a3d-a2ca-331feaa0c288","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/105","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.642Z"}],"sources":[{"listingId":"c60118b2-5145-4a3d-a2ca-331feaa0c288","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/105","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.642Z","lastSeenAt":"2026-04-22T02:32:05.699Z"}],"details":{"listingId":"c60118b2-5145-4a3d-a2ca-331feaa0c288","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/105 \\\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 accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/messages/105"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/messages/105"}],"useCases":["Accessing a premium messages endpoint via a single USDC micropayment on Base","Integrating pay-per-call APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API access settled in crypto"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-request pricing without rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Applications requiring non-crypto payment methods","High-volume batch workloads where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:02.288Z"},"updatedAt":"2026-04-22T02:32:05.699Z"}}