{"id":"58a472db-2f12-433a-b5ea-ac8c2869f518","shortId":"ERGDxy","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/products/4` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals) — equivalent to $0.02 per request. Payment is settled on-chain with no API keys, no rate limits, and no subscriptions required.\n\nThe broader 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 and use the x402 exact-payment scheme on Base.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The `/api/v1/products/4` endpoint itself is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality this specific product endpoint returns.","tags":[],"capabilities":["x402-payment","pay-per-request","base-network","usdc-settlement","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment api","on-chain api access"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/products/4 ('Premium API Access') is undocumented — unclear what it returns","Cannot verify that the advertised AI, finance, and data endpoints actually function as described"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation, and no examples. The /docs and other pages are empty beyond a wallet-connect prompt. The specific purpose of /api/v1/products/4 is unclear beyond its 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'/api/v1/products/4':63,216 '/call':19,38 '/docs':180 '/pricing':182 '/readme':184 '/request':158 '0.02':18,37,90,157 '000':77 '0x8335':82 '20':76 '2913':83 '402':225 '402 payment api' '6':86 'access':50,68 'advertis':113 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':118 'api':5,24,48,67,101 'avail':211 'base':8,27,58,78,85,170 'base usdc api' 'base-network' 'beyond':172 'broader':111 'categori':116 'chain':98 'challeng':226 'classif':131 'classification' 'collect':42 'confirm':220 'connect':190 'convers':148 'crawl':214 'data':11,30,117,121,234 'data-analytics' 'decim':87 'detail':197 'document':171,206,229 'embed':132 'embeddings' 'endpoint':16,35,49,62,115,151,217,240 'equival':88 'estim':142 'exact':166 'exact-pay':165 'exampl':210 'exchang':137 'export':122 'extrem':177 'feed':136 'financ':13,32,133 'finance-data' 'four':114 'function':236 'gas':141 'generat':149 'geocod':146 'geocoding' 'host':40 'infrastructur':144 'insight':123 'key':102 'label':65 'land':174 'learn':126 'limit':105 'list':153 'live':221 'low payment fee' 'lowpaymentfee.com':39 'machin':125 'metric':119 'micropayment api' 'network':59 'no-api-key' 'on-chain':96 'on-chain api access' 'openapi':201 'page':175,185 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payment':54,72,93,167 'per':3,22,46,91 'platform':112 'point':160 'premium':66 'price':135,159 'product':239 'prompt':192 'proper':224 'protocol':55 'quot':140 'rate':104,138 'render':187 'report':120 'request':4,23,47,92 'request/response':204 'requir':70,109 'return':222,241 'schema':205 'scheme':168 'sentiment':127 'sentiment-analysis' 'settl':95 'spars':178 'spec':202 'specif':61,238 'subscript':108 'suit':6,25 'summar':130 'technic':196 'text':129 'text-summarization' 'token':139 'unclear':232 'unit':79 'usag':209 'usdc':81 'usdc-settlement' 'use':162 'util':15,34,145 'utility-apis' 'valid':147 'via':9,28,51 'wallet':191 'web3':134 'without':228 'x402':10,29,53,164 'x402 api' 'x402-payment'","prices":[{"id":"a3d6c947-036c-4e78-bbcd-8b3c3525c838","listingId":"58a472db-2f12-433a-b5ea-ac8c2869f518","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:37.887Z"}],"sources":[{"listingId":"58a472db-2f12-433a-b5ea-ac8c2869f518","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:37.887Z","lastSeenAt":"2026-04-22T21:30:30.225Z"}],"details":{"listingId":"58a472db-2f12-433a-b5ea-ac8c2869f518","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/4 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/products/4"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request crypto micropayments","Using utility services like geocoding and validation without subscriptions"],"bestFor":["Agents and developers who want zero-signup, pay-as-you-go API access","Use cases requiring low-cost micropayments settled on Base L2","Projects already holding USDC on Base that need quick utility or AI endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads that would benefit from bulk pricing or rate guarantees","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.268Z"},"updatedAt":"2026-04-22T21:30:30.225Z"}}