{"id":"b7c041f7-a26a-42d5-ab39-72109318fe6c","shortId":"PjKWtP","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/227` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what input the `/api/v1/transactions/227` endpoint expects or what it returns beyond JSON.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The purpose and expected input/output of /api/v1/transactions/227 is undocumented","The broader platform lists many endpoints but none have documented schemas or examples"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/227","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/transactions/227","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and settlement details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/transactions/227 ('Premium API Access') is completely 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'/api/v1/transactions/227':94,217 '/docs':166 '/pricing':167 '/readme':170 '/request':13,28 '0.02':12,27,62,121 '000':110 '0x8335':115 '20':109 '2913':116 '402':104,205 '6':125 'Base network API' 'USDC API' 'accept':129 'access':100 'account':74 'across':45 'advertis':138 'ai/ml':48 'analysi':142 'analyt':47 'api':5,20,37,72,99 'application/json':134 'attach':82 'avail':196 'base':8,23,69,111,118 'base-network' 'beyond':224 'broader':136 'call':4,19 'caller':80 'challeng':105,206 'classif':145 'confirm':207 'connect':176 'content':182 'convers':157 'crawl':199 'crypto-paid API' 'data':46,159 'decim':126 'document':161,191,210 'embed':146 'enabl':36 'endpoint':44,55,92,128,139,202,218 'equal':120 'estim':154 'exampl':195 'exchang':149 'expect':219 'extrem':163 'feed':148 'finance/web3':50 'gas':153 'generat':160 'geocod':155 'given':122 'header':86 'infer':49 'infrastructur':52 'input':215 'json':225 'json-response' 'key':73 'limit':77 'list':96 'live':204 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':200 'micropayment API' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':186 'page':171 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85 'per':3,18,59 'platform':6,21,38,137 'post':130 'post-method' 'premium':98 'price':147 'prompt':178 'quot':152 'rate':76,150 'render':173 'request':60,89,106,131 'request/response':189 'requir':79 'return':102,133,223 'schema':190 'sentiment':141 'settl':64 'simpli':81 'spars':164 'spec':187 'specif':91 'summar':144 'text':143 'token':151 'unclear':213 'unit':112 'usag':194 'usdc':15,30,66,114,123 'usdc-settlement' 'util':53 'valid':156 'varieti':42 'via':10,25 'wallet':177 'without':209 'x402':11,26,35,84 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e16d890c-ac52-4862-b5b3-1fe30dd6bd59","listingId":"b7c041f7-a26a-42d5-ab39-72109318fe6c","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/transactions/227","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:14.457Z"}],"sources":[{"listingId":"b7c041f7-a26a-42d5-ab39-72109318fe6c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/227","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:14.457Z","lastSeenAt":"2026-04-23T19:01:46.128Z"}],"details":{"listingId":"b7c041f7-a26a-42d5-ab39-72109318fe6c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/227 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/227"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need frictionless pay-per-request access"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation and request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.734Z"},"updatedAt":"2026-04-23T19:01:46.128Z"}}