{"id":"487d2683-8323-4ef7-b0b4-2b9ac635f72a","shortId":"pTdfp2","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Each call costs $0.02 in USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled inline via the x402 payment header.\n\nThe specific endpoint at `/api/v1/products/72` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it accepts POST requests and charges a maximum of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 generation — all at the same $0.02 price point. However, no OpenAPI schema, detailed documentation, or example request/response payloads are available from the crawled pages. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. The exact functionality behind the `/api/v1/products/72` path is unclear beyond its title.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","json-api","no-api-key","premium-api-access"],"categories":["api-marketplace","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality of /api/v1/products/72 ('Premium API Access') is not described anywhere in the crawled content","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no useful content","No example request or response payloads are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/72","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/products/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the specific functionality of /api/v1/products/72 is undocumented. The docs/pricing/README pages are all empty (wallet-connect 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'/request':13,30 '0.02':12,29,70,135,182 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x8335':129 '20':123 '2913':130 '300':150 '402 payment api' '6':139 'accept':115 'access':51,106 'address':146 'advertis':156 'ai/ml':60 'analysi':160 'analyt':59 'api':5,15,22,32,42,79,105,203 'application/json':109 'avail':196 'base':8,25,75,125,132 'base network api' 'behind':222 'beyond':228 'broader':154 'call':4,21,68 'challeng':112 'charg':119 'classif':163 'commit':85 'confirm':113 'connect':212 'content':218 'convers':175 'cost':69 'crawl':199 'data':58,63 'decim':140 'detail':189 'doc':202 'document':190 'embed':164 'endpoint':56,98,157 'equal':134 'estim':172 'exact':220 'exampl':192 'exchang':167 'feed':166 'finance/web3':62 'function':221 'gas':171 'gate':50 'generat':177 'geocod':173 'given':136 'handl':89 'header':95 'howev':185 'infer':61 'inlin':90 'json-api' 'key':16,33,80 'limit':82 'list':102 'low payment fee' 'lowpaymentfee.com':35 'maximum':121 'micropayment api' 'network':76 'no-api-key' 'openapi':187 'page':200,207 'path':225 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payload':194 'payment':87,94,142 'per':3,20,40 'platform':6,23,43,155 'point':184 'post':116 'premium':104 'premium-api-access' 'price':165,183,204 'prompt':214 'protocol':48 'quot':170 'rate':81,168 'readm':206 'request':41,117 'request/response':193 'requir':17,34,86 'return':108,209 'schema':188 'second':151 'sentiment':159 'servic':66 'settl':144 'span':57 'specif':97 'substant':217 'summar':162 'text':161 'timeout':152 'titl':230 'token':169 'unclear':227 'unit':126 'upfront':84 'usdc':9,26,72,128,137 'usdc api' 'usdc-base' 'use':45 'util':65 'valid':174 'varieti':54 'via':10,27,91 'wallet':213 'x402':11,28,47,93,111 'x402 api' 'x402-payment'","prices":[{"id":"2092b59f-a94b-4556-84df-5bc49741207c","listingId":"487d2683-8323-4ef7-b0b4-2b9ac635f72a","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/products/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:30.967Z"}],"sources":[{"listingId":"487d2683-8323-4ef7-b0b4-2b9ac635f72a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:30.967Z","lastSeenAt":"2026-04-23T09:00:46.570Z"}],"details":{"listingId":"487d2683-8323-4ef7-b0b4-2b9ac635f72a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/72 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/72"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/72"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.722Z"},"updatedAt":"2026-04-23T09:00:46.570Z"}}