{"id":"ee268aae-7762-4d10-9844-57db12a0d79e","shortId":"dwQEVu","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/payments/283` 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 payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.\n\nThe 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. However, documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response schemas of these endpoints are undocumented in the crawled material. The specific functionality behind the `/api/v1/payments/283` path is unclear — it may be a generic or demo endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","no-rate-limit"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt.","No OpenAPI or schema available; request and response formats for this endpoint are unknown.","The specific functionality of /api/v1/payments/283 is not described anywhere in the crawled material.","The platform lists many endpoint categories but none have documented schemas or example responses."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/283","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/payments/283","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and the docs/pricing/README pages are all empty (just 'Connect wallet'). The specific purpose of /api/v1/payments/283 is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,62,121 '000':110 '0x8335':115 '20':109 '2913':116 '300':134 '402':104 '6':125 'Base network API' 'USDC API' 'accept':139 'access':100 'account':74 'across':45 'actual':190 'advertis':148 'ai/ml':48 'analysi':152 'analyt':47 'api':5,20,37,72,99 'application/json':144 'attach':82 'base':8,23,69,111,118 'base-network' 'behavior':191 'behind':207 'broader':146 'call':4,19 'caller':80 'challeng':105 'classif':155 'connect':181 'content':187 'convers':167 'crawl':202 'crypto-paid API' 'data':46,169 'decim':126 'demo':219 'doc':174 'document':172 'embed':156 'enabl':36 'endpoint':44,55,92,138,149,197,220 'equal':120 'estim':164 'exact':131 'exchang':159 'feed':158 'finance/web3':50 'function':206 'gas':163 'generat':170 'generic':217 'geocod':165 'given':122 'header':86 'howev':171 'infer':49 'infrastructur':52 'json-api' 'key':73 'limit':77 'list':96 'lowpaymentfee' 'lowpaymentfee.com':31 'materi':203 'may':214 'micropayment API' 'network':9,24,70 'no-api-key' 'no-rate-limit' 'offer':40 'page':173 'path':210 'pay':2,17,58 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':57 'payment':85,128 'per':3,18,59 'platform':6,21,38,147 'post':140 'premium':98 'price':157,175 'prompt':183 'quot':162 'rate':76,160 'readm':176 'request':60,89,106,141 'requir':79 'respons':193 'return':102,143,178 'schema':194 'scheme':129 'second':135 'sentiment':151 'settl':64 'simpli':81 'specif':91,205 'substant':186 'summar':154 'text':153 'timeout':136 'token':161 'unclear':212 'undocu':199 'unit':112 'usdc':15,30,66,114,123 'usdc-settlement' 'util':53 'valid':166 'varieti':42 'via':10,25 'wallet':182 'x402':11,26,35,84 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"bc952edc-e948-493c-bbdf-8f7bcce98c0f","listingId":"ee268aae-7762-4d10-9844-57db12a0d79e","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/payments/283","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:21.708Z"}],"sources":[{"listingId":"ee268aae-7762-4d10-9844-57db12a0d79e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/283","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:21.708Z","lastSeenAt":"2026-04-24T05:32:18.340Z"}],"details":{"listingId":"ee268aae-7762-4d10-9844-57db12a0d79e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/283 \\\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":"Endpoint returns 402 with x402 challenge requesting 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/283"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/283"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing API services without creating accounts or managing API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless, keyless API access"],"bestFor":["Developers wanting zero-signup API access with crypto payments","AI agents that can attach x402 payment headers autonomously","Users who prefer pay-as-you-go pricing without subscriptions"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.277Z"},"updatedAt":"2026-04-24T05:32:18.340Z"}}