{"id":"0d73e46d-12c9-491b-9fb6-5e5f1606bfd9","shortId":"w8ZBHN","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 settled in USDC on the Base network. The specific endpoint `/api/v1/keys/26` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 listed at the same $0.02/request price point. The platform claims no rate limits and instant access.\n\nHowever, the specific functionality behind `/api/v1/keys/26` (\"Premium API Access\") is not documented beyond its name. There is no OpenAPI schema, no request/response examples, and the crawled documentation pages (pricing, README, API) all returned only a \"Connect wallet\" prompt with no further content. The endpoint is confirmed live via a valid 402 challenge, but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API gateway"],"warnings":["No documentation available — /api, /pricing, and /README pages all returned only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for this endpoint","The purpose of '/api/v1/keys/26' ('Premium API Access') is completely undocumented — unclear what it returns","The broader platform lists many endpoint categories but none could be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/26","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/keys/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation explaining what '/api/v1/keys/26' actually does or accepts. The crawled docs pages were empty beyond wallet-connect prompts. This is effectively a stub 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'/request':19,38,167 '0.02':18,37,79,166 '000':83 '20':82 '402':229 '6':89 'Base network API' 'USDC API' 'access':74,178,187 'account':101 'actual':234 'advertis':122 'ai':12,31,133 'ai-inference' 'analysi':137 'analyt':127 'api':5,24,45,73,99,186,209 'attach':108 'base':8,27,63,84 'base-network' 'behind':183 'beyond':191 'broad':50 'call':4,23,81 'caller':106 'catalog':51 'categori':125 'challeng':230 'claim':172 'classif':140 'confirm':224 'connect':214 'content':220 'convers':157 'cost':76 'crawl':204 'crypto API gateway' 'data':11,30,126,130 'data-analytics' 'decim':90 'document':190,205 'embed':141 'enabl':44 'endpoint':16,35,57,67,124,160,222 'estim':151 'exampl':201 'exchang':146 'export':131 'feed':145 'financ':13,32,142 'finance-data' 'four':123 'function':182 'gas':150 'generat':158 'geocod':155 'handl':93 'header':113 'howev':179 'infrastructur':153 'insight':132 'instant':177 'key':100 'learn':135 'limit':175 'list':70,162 'live':225 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':134 'metric':128 'micropayment API' 'name':193 'network':64 'no-api-key' 'offer':10,29 'openapi':197 'page':206 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':91,112,117,238 'per':3,22,55,80 'platform':6,25,46,121,171 'point':169 'premium':72,185 'price':144,168,207 'prompt':216 'proof':118 'protocol':97 'provid':48 'quot':149 'rate':147,174 'readm':208 'report':129 'request':56 'request/response':200 'requir':105 'return':211,235 'schema':198 'sentiment':136 'settl':58 'simpli':107 'specif':66,181 'subscript':103 'success':237 'summar':139 'text':138 'token':148 'unit':85 'unknown':240 'upon':236 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,154 'utility-services' 'valid':116,156,228 'via':94,226 'wallet':215 'web3':143 'wider':120 'x':111 'x-payment':110 'x402':43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"014dc937-8075-445e-b46c-3236a7ebdb3b","listingId":"0d73e46d-12c9-491b-9fb6-5e5f1606bfd9","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/keys/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.483Z"}],"sources":[{"listingId":"0d73e46d-12c9-491b-9fb6-5e5f1606bfd9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.483Z","lastSeenAt":"2026-04-22T04:02:36.881Z"}],"details":{"listingId":"0d73e46d-12c9-491b-9fb6-5e5f1606bfd9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/26 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/26"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/26"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Pay-per-use data analytics and reporting","Lightweight AI inference (sentiment, summarization, classification, embeddings) billed per call","Fetching real-time crypto gas estimates or token quotes with micropayments","Geocoding or data conversion without upfront commitments"],"bestFor":["AI agents needing frictionless, key-free API access via x402","Developers who want pay-as-you-go pricing with no minimums","Projects already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume workloads where $0.02/request adds up significantly compared to subscription-based alternatives","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.767Z"},"updatedAt":"2026-04-22T04:02:36.881Z"}}