{"id":"9b617f7f-8106-40b3-ab7a-de779cbd8fe5","shortId":"pWt5Hc","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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/transactions/326` is labeled \"Premium API Access\" and follows the same x402 payment pattern.\n\nThe platform advertises four main 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 utilities (geocoding, validation, conversion, generation). All endpoints use the x402 protocol's exact payment scheme, settling in USDC (contract 0x8335…2913) on Base.\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 spec, no request/response schema documentation, and no usage examples available from the crawled content. The x402 challenge on the probed endpoint is live and well-formed, confirming the payment flow works, but the actual functionality behind each endpoint cannot be verified from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema definitions found for any endpoint","The specific endpoint /api/v1/transactions/326 is not listed on the homepage catalog; its purpose is unclear","Cannot verify what data or functionality any endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/326","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/326","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 well-formed, confirming the payment mechanism works. However, documentation is essentially absent — every doc/pricing/README page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schemas, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/transactions/326 is unclear. The listing is largely a 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'/api/v1/transactions/326':84 '/docs':161 '/pricing':163 '/readme':165 '/request':13,28 '0.02':12,27,59 '0x8335':152 '2913':153 'access':89 'actual':217 'advertis':99 'ai':112 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':116 'analyt':48,106 'api':5,20,37,71,88,104 'avail':192,226 'base':8,23,67,155 'base network api' 'behind':219 'broad':42 'call':4,19 'cannot':222 'catalog':43 'categori':102 'challeng':199 'classif':119 'commit':79 'confirm':210 'connect':171 'content':196 'contract':151 'convers':136 'conversion' 'cost':58 'crawl':195 'crypto-gas-estimates' 'data':47,52,105,109 'data-analytics' 'detail':178 'document':156,187 'embed':120 'enabl':36 'endpoint':45,57,82,139,203,221 'estim':130 'everi':56 'exact':145 'exampl':191 'exchang':125 'exchange-rates' 'export':110 'extrem':158 'feed':124 'financ':121 'finance-price-feeds' 'finance/web3':51 'flow':213 'follow':91 'form':209 'four':100 'function':218 'gas':129 'generat':137 'geocod':134 'geocoding' 'infer':50 'infrastructur':132 'insight':111 'key':72 'label':86 'learn':114 'limit':75 'live':205 'low payment fee' 'lowpaymentfee.com':31 'machin':113 'main':101 'materi':227 'metric':107 'micropayment api' 'network':9,24,68 'no-api-key endpoint' 'offer':40 'openapi':182 'page':166 'paid':62 'pattern':96 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':95,146,212 'per':3,18,60 'platform':6,21,38,98 'premium':87 'price':123 'probe':202 'prompt':173 'protocol':143 'quot':128 'rate':74,126 'render':168 'report':108 'request':61 'request/response':185 'schema':186 'scheme':147 'sentiment':115 'servic':55 'settl':148 'span':46 'spars':159 'spec':183 'specif':81 'summar':118 'technic':177 'text':117 'token':127 'upfront':78 'usag':190 'usdc':15,30,64,150 'usdc api' 'usdc-base-network' 'use':140 'util':54,133 'valid':135 'validation' 'verifi':224 'via':10,25 'wallet':172 'web3':122 'well':208 'well-form':207 'work':214 'x402':11,26,35,94,142,198 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6e19c42f-db20-4e6e-9d8b-2711e1f09e8a","listingId":"9b617f7f-8106-40b3-ab7a-de779cbd8fe5","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/326","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:10.734Z"}],"sources":[{"listingId":"9b617f7f-8106-40b3-ab7a-de779cbd8fe5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/326","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:10.734Z","lastSeenAt":"2026-04-22T10:32:21.791Z"}],"details":{"listingId":"9b617f7f-8106-40b3-ab7a-de779cbd8fe5","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to pay and access:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/326 \\\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 cost $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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns 402 with USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), maxAmountRequired 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/transactions/326"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) on a per-call payment basis without API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion with instant crypto-settled payments"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle x402 payments in USDC on Base","Low-volume or exploratory use cases where $0.02/request flat pricing is attractive"],"notFor":["High-volume production workloads that need SLAs, rate-limit guarantees, or detailed documentation","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.64Z"},"updatedAt":"2026-04-22T10:32:21.791Z"}}