{"id":"98a70882-f23a-4b26-939a-d48dcc7c8804","shortId":"kNHNCq","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 provides a broad catalog of pay-per-request endpoints across four categories: Data & Analytics (metrics, reports, data 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/157` is listed as \"Premium API Access\" with a maximum charge of 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals). It accepts HTTP POST requests and returns application/json. No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request. The platform requires no sign-up, minimums, or commitments.\n\nDocumentation is minimal: the landing page lists available endpoints and pricing, but the /api, /pricing, and /README pages all resolve to a wallet-connect stub with no further detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The purpose of the `/api/v1/messages/157` endpoint specifically is unclear — the generic \"Premium API Access\" label does not describe what data or functionality it provides. Prospective callers should be aware that the actual behavior of this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The specific endpoint /api/v1/messages/157 has no documented purpose — 'Premium API Access' is a generic label with no description of what it returns.","No OpenAPI spec, no request schema, and no response schema are available.","The /api, /pricing, and /README pages all resolve to a wallet-connect stub with no content.","Without example requests or responses, callers cannot know what payload to send or what to expect back."],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/157","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/157","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the purpose of /api/v1/messages/157 is entirely unclear. The landing page lists many endpoints but provides no usage details for any of 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'/api/v1/messages/157':117,225 '/pricing':192 '/readme':194 '/request':19,38 '0.02':18,37,99,136 '000':130 '20':129 '6':140 'Base network API' 'USDC micropayment API' 'accept':143 'access':123,234 'across':58 'actual':252 'advertis':157 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,122,151,233 'application/json':149 'attach':160 'avail':185 'awar':249 'base':8,27,107,131 'behavior':253 'broad':50 'call':4,23 'caller':158,246 'catalog':51 'categori':60 'charg':127 'classif':75 'commit':177 'connect':202 'convers':92 'crypto-paid API' 'data':11,30,61,65,240 'decim':141 'describ':238 'detail':207 'document':178,216 'embed':76 'enabl':44 'endpoint':16,35,57,95,115,186,226,256 'estim':86 'exampl':220 'exchang':81 'export':66 'feed':80 'financ':13,32,77 'four':59 'function':242 'gas':85 'generat':93 'generic':231 'geocod':90 'given':137 'header':164 'http':144 'http-post' 'i.e':135 'infrastructur':88 'insight':67 'json-response' 'key':152 'label':235 'land':182 'learn':70 'limit':155 'list':119,184 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'maximum':126 'metric':63 'minim':180 'minimum':175 'network':108 'no-api-key' 'no-rate-limit' 'offer':10,29 'openapi':211 'page':183,195 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':163 'per':3,22,55,100 'platform':6,25,46,169 'post':145 'premium':121,232 'price':79,97,188 'prospect':245 'protocol':112 'provid':48,244 'purpos':222 'quot':84 'rate':82,154 'report':64 'request':56,101,146,167 'request/response':214 'requir':170 'resolv':197 'return':148 'schema':215 'sentiment':71 'settl':102 'sign':173 'sign-up':172 'simpli':159 'spec':212 'specif':114,227 'stub':203 'summar':74 'text':73 'token':83 'unclear':229 'undocu':258 'unit':132 'usag':219 'usdc':9,28,104,134,138 'usdc-base' 'util':15,34,89 'valid':91 'via':109 'wallet':201 'wallet-connect':200 'web3':78 'x402':43,111,162 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"bc9899a6-5896-4055-abda-ef58718d41e2","listingId":"98a70882-f23a-4b26-939a-d48dcc7c8804","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/157","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.359Z"}],"sources":[{"listingId":"98a70882-f23a-4b26-939a-d48dcc7c8804","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/157","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.359Z","lastSeenAt":"2026-04-22T02:32:06.886Z"}],"details":{"listingId":"98a70882-f23a-4b26-939a-d48dcc7c8804","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/157 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimums","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"},{"claim":"The x402 challenge for /api/v1/messages/157 shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/157"},{"claim":"Payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/messages/157"}],"useCases":["Accessing pay-per-request data, AI, finance, or utility APIs without API key registration","Making micropayment-gated API calls settled on Base L2 in USDC","Integrating x402-compatible agent workflows that need on-demand endpoint access"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-native agent pipelines that settle payments in USDC on Base","Low-volume or experimental use cases where $0.02/call is acceptable"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where per-call crypto settlement adds overhead","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.125Z"},"updatedAt":"2026-04-22T02:32:06.886Z"}}