{"id":"a95ac25a-1e98-4385-8800-fac56f73c75f","shortId":"DzD2XH","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe probed endpoint (`/api/v1/transactions/1`) is labeled \"Premium API Access\" and returned a live 402 challenge requesting up to 20,000 base-unit USDC (i.e., $0.02, since USDC uses 6 decimals). The site 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/Utilities (geocoding, validation, conversion, generation). All are listed at the same $0.02 price point.\n\nDocumentation beyond the landing page is extremely thin — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. No OpenAPI spec, request/response schemas, or usage examples are available from the crawl. The actual behavior and response format of each endpoint is therefore unknown and must be discovered by making paid calls.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","analytics-api","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","data-export","validation-utils"],"categories":["ai","finance","data","utilities"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","sentiment analysis api","text summarization api","crypto price api"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior is unverifiable without making paid calls","All non-landing pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/transactions/1 is labeled 'Premium API Access' but its purpose and response format are undocumented","Cannot confirm what data or functionality any of the advertised endpoints actually return"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/1","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/1","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, and the landing page lists many endpoints with pricing. However, there is no OpenAPI spec, no request/response schemas, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality behind each endpoint is unverifiable from available 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'/api/v1/transactions/1':106 '/docs':191 '/pricing':193 '/readme':195 '/request':18,36 '0.02':17,35,67,128,179 '000':122 '20':121 '402':116 '6':132 'access':111 'actual':223 'advertis':136 'ai':12,30,148 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'analysi':152 'analyt':11,29,54,142 'analytics-api' 'api':5,23,43,84,110,140 'attach':95 'avail':218 'base':8,26,75,124 'base network api' 'base-unit':123 'behavior':224 'beyond':183 'broad':48 'call':4,22,241 'caller':93 'categori':138 'challeng':117 'classif':155 'collect':49 'commit':92 'connect':201 'convers':171 'cover':10,28 'crawl':221 'crypto price api' 'crypto-gas-estimates' 'data':53,58,141,145 'data-export' 'decim':133 'detail':208 'discov':237 'document':182 'embed':156 'enabl':42 'endpoint':51,63,105,230 'estim':166 'everi':62 'exampl':216 'exchang':161 'exchange-rates' 'export':146 'extrem':188 'feed':160 'financ':13,31,157 'finance-price-feeds' 'finance/web3':57 'format':227 'four':137 'gas':165 'general':60 'generat':172 'geocod':169 'geocoding' 'header':99 'i.e':127 'infer':56 'infrastructure/utilities':168 'insight':147 'key':85 'label':108 'land':185 'learn':150 'limit':88 'list':175 'live':115 'low payment fee' 'lowpaymentfee.com':37 'machin':149 'make':239 'metric':143 'micropayment api' 'must':235 'network':76 'offer':46 'openapi':210 'page':186,196 'paid':70,240 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':98 'per':3,21,68 'platform':44 'point':181 'premium':109 'price':65,159,180 'probe':104 'prompt':203 'protocol':80 'quot':164 'rate':87,162 'render':198 'report':144 'request':69,102,118 'request/response':212 'respons':226 'return':113 'schema':213 'sentiment':151 'sentiment analysis api' 'simpli':94 'sinc':129 'site':135 'span':52 'spec':211 'suit':6,24 'summar':154 'technic':207 'text':153 'text summarization api' 'therefor':232 'thin':189 'token':163 'unit':125 'unknown':233 'upfront':91 'usag':215 'usdc':9,27,72,126,130 'usdc api' 'usdc-base' 'use':131 'util':15,33,61 'valid':170 'validation-utils' 'via':77 'wallet':202 'web3':158 'x402':41,79,97 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"cd90b945-c6ef-4a04-ba7c-f43194868608","listingId":"a95ac25a-1e98-4385-8800-fac56f73c75f","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:20.143Z"}],"sources":[{"listingId":"a95ac25a-1e98-4385-8800-fac56f73c75f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:20.143Z","lastSeenAt":"2026-04-22T13:31:44.322Z"}],"details":{"listingId":"a95ac25a-1e98-4385-8800-fac56f73c75f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/1 \\\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 challenge requesting up to 20,000 base-unit USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/1"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/1"}],"useCases":["Running sentiment analysis or text summarization without managing API keys or subscriptions","Fetching real-time crypto token quotes and gas estimates via micropayment","Geocoding addresses or validating data on a per-request payment basis","Exporting analytics data or generating reports with no rate limits","Generating text embeddings for search or recommendation systems"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle USDC payments on Base via x402","Projects needing lightweight access to multiple utility endpoints without onboarding"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.386Z"},"updatedAt":"2026-04-22T13:31:44.322Z"}}