{"id":"e938b5ae-ea2d-4788-b695-e6d4f63d9ee2","shortId":"KbNtSt","kind":"x402","title":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/generate/resource/64` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call given USDC's 6 decimals.\n\nThe provider's landing page advertises four categories of APIs: 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/Utility (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation 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 schema, no request/response examples, and no description of what the `/api/v1/generate/resource/64` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key","no-rate-limit"],"categories":["api","infrastructure"],"synonyms":["x402 api","pay per call api","micropayment api","base network api","usdc api","lowpaymentfee","premium api access","crypto pay api"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages are all empty (wallet-connect only)","No OpenAPI or schema describing request body or response format for /api/v1/generate/resource/64","The purpose of 'Premium API Access' at this specific resource path is entirely unclear","Cannot verify what data or functionality is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/64","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/generate/resource/64","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 network. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. It is impossible to determine what this specific endpoint does or what inputs it expects without further 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'/api/v1/generate/resource/64':65,203 '/docs':171 '/pricing':173 '/readme':175 '/request':19,38 '0.02':18,37,96,151 '000':85 '0x8335':90 '20':84 '2913':91 '402':214 '6':102 'accept':73 'access':71 'actual':205 'advertis':79,109 'ai':12,31,121 'amount':82 'analysi':125 'analyt':115 'api':5,24,48,70,113,156 'base':8,27,57,86,93 'base network api' 'call':4,23,98 'categori':111 'challeng':78,215 'classif':128 'collect':42 'commit':164 'connect':181 'convers':144 'crypto pay api' 'data':11,30,114,118 'decim':103 'descript':199 'detail':188 'document':166,218 'embed':129 'endpoint':16,35,49,63,147,204,208 'equal':95 'estim':139 'exampl':196 'exchang':134 'expect':230 'export':119 'extrem':168 'feed':133 'financ':13,32,130 'four':110 'gas':138 'generat':145 'geocod':142 'given':99 'infrastructure/utility':141 'insight':120 'key':157 'land':107 'learn':123 'limit':160 'list':67,149 'live':210 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':122 'max':81 'metric':116 'micropayment api' 'minimum':163 'network':58 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':192 'page':108,176 'pay':2,21,45 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':44 'payload':223 'per':3,22,46,97,152 'post':74 'post-endpoint' 'premium':69 'premium api access' 'price':132 'prompt':183 'protocol':54 'provid':105 'quot':137 'rate':135,159 'render':178 'report':117 'request':47,75,153 'request/response':195 'requir':165 'respons':228 'return':206,211 'schema':193 'send':225 'sentiment':124 'settl':50 'spars':169 'specif':62 'suit':6,25 'summar':127 'technic':187 'text':126 'token':136 'unclear':221 'unit':87 'usdc':60,89,100 'usdc api' 'usdc-base' 'use':59 'util':15,34 'valid':143,213 'via':9,28,51 'wallet':182 'web3':131 'without':217 'x402':10,29,53,77 'x402 api' 'x402-payment'","prices":[{"id":"e82cdb26-b37f-4f75-bc5a-47690e197d15","listingId":"e938b5ae-ea2d-4788-b695-e6d4f63d9ee2","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/generate/resource/64","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:34.285Z"}],"sources":[{"listingId":"e938b5ae-ea2d-4788-b695-e6d4f63d9ee2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/64","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:34.285Z","lastSeenAt":"2026-04-22T23:01:02.018Z"}],"details":{"listingId":"e938b5ae-ea2d-4788-b695-e6d4f63d9ee2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/64 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/64"},{"claim":"All endpoints are listed 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 provider advertises four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to utility/generation endpoints without API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Low-friction API consumption where traditional billing is undesirable"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible agent wallets on the Base network","Low-volume or sporadic API consumers who prefer per-call billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who need 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":"2026-02-17T23:14:44.595Z"},"updatedAt":"2026-04-22T23:01:02.018Z"}}