{"id":"b08e2975-2abe-40c1-b3b0-a529be0d76d3","shortId":"bNbsXv","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that exposes a broad catalog of endpoints across four categories: Data & Analytics (metrics, reports, export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/messages/128` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made per-call via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The endpoint accepts HTTP POST requests and returns application/json.\n\nNote that while the landing page catalogs many endpoints, the `/api/v1/messages/128` path does not appear in the public listing, and no documentation, request schema, or response schema is available for it. The broader platform pages (pricing, README, API docs) all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail. Without request/response examples or OpenAPI specs, the actual functionality behind this specific endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","general"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation, OpenAPI spec, or request/response schema available for /api/v1/messages/128","The /api/v1/messages/128 path does not appear in the site's public endpoint catalog","Pricing, README, and API doc pages all resolve to a minimal 'Connect wallet' page with no content","Actual functionality of this endpoint is unclear — 'Premium API Access' is the only descriptor"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/128","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/128","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, no documentation for this specific path, and the broader docs pages are empty. The actual functionality of /api/v1/messages/128 is 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'/request':19,38 '0.02':18,37,94,138 '000':127 '0x8335':132 '20':126 '2913':133 '402 payment api' '6':142 'accept':169 'access':118 'across':54 'actual':235 'addit':225 'advertis':122 'ai':12,31,63 'analysi':67 'analyt':58 'api':5,24,45,117,157,213 'appear':190 'application/json':175 'avail':204 'base':8,27,102,128,135 'base network api' 'behind':237 'broad':50 'broader':208 'call':4,23,149 'catalog':51,182 'categori':56 'challeng':121 'classif':70 'commit':165 'connect':220 'convers':87 'data':11,30,57 'decim':143 'detail':227 'doc':214 'document':197 'embed':71 'enabl':44 'endpoint':16,35,53,90,110,168,184,240 'equal':137 'estim':81 'exact':153 'exampl':230 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'four':55 'function':236 'gas':80 'generat':88 'geocod':85 'given':139 'http':170 'http-post' 'infrastructur':83 'insight':62 'json-response' 'key':158 'land':180 'learn':65 'limit':161 'list':114,194 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'made':146 'mani':183 'maxamountrequir':124 'metric':59 'micropayment api' 'minim':219 'network':103 'no-api-key' 'no-rate-limit' 'note':176 'offer':10,29 'openapi':232 'page':181,210 'path':187 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':144 'per':3,22,95,148 'per-cal':147 'platform':6,25,46,209 'post':171 'premium':116 'price':74,92,211 'prompt':222 'protocol':107 'public':193 'quot':79 'rate':77,160 'readm':212 'remain':241 'report':60 'request':96,172,198 'request/response':229 'requir':166 'resolv':216 'respons':201 'return':174 'schema':199,202 'scheme':154 'sentiment':66 'settl':97 'spec':233 'specif':109,239 'summar':69 'technic':226 'text':68 'token':78 'unclear':242 'unit':129 'upfront':164 'usdc':9,28,99,131,140 'usdc api' 'usdc-base' 'util':15,34,84 'valid':86 'via':104,150 'wallet':221 'web3':73 'without':228 'x402':43,106,120,152 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"e2b4a577-525a-44dc-a895-40828618074b","listingId":"b08e2975-2abe-40c1-b3b0-a529be0d76d3","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/128","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:25.884Z"}],"sources":[{"listingId":"b08e2975-2abe-40c1-b3b0-a529be0d76d3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/128","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:25.884Z","lastSeenAt":"2026-04-22T04:02:39.537Z"}],"details":{"listingId":"b08e2975-2abe-40c1-b3b0-a529be0d76d3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/128 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/128"},{"claim":"All listed 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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand, per-call payment for various utility endpoints","Integrating low-cost data, AI inference, or finance endpoints into applications via crypto micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Projects needing cheap 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 not be optimal"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.924Z"},"updatedAt":"2026-04-22T04:02:39.537Z"}}