{"id":"bd1f14d2-278b-4a38-ae05-4e5ca5a981d6","shortId":"ktVyG9","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 an x402-enabled API platform that offers a broad collection 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. There are no API keys, no rate limits, and no signup — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/235` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\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, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto pay api"],"warnings":["All documentation pages (/docs, /api, /pricing, /README) are empty — they only display 'Connect wallet'","No OpenAPI or request/response schema is available for any endpoint","The specific functionality of /api/v1/payments/235 ('Premium API Access') is not documented — it is unclear what it returns","The platform lists many endpoint categories (AI, finance, geo, etc.) but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/235","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/payments/235","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 endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation of request/response formats, and all doc/pricing/README pages are empty stubs showing only 'Connect wallet'. The specific purpose of the /payments/235 endpoint beyond 'Premium API Access' is 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'/request':13,30 '0.02':12,29,63,128,177 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':123 '20':116 '300':141 '6':132 'accept':106 'access':104 'actual':199 'address':146 'advertis':112,151 'ai-inference' 'ai/ml':53 'analysi':155 'analyt':52 'api':5,15,22,32,41,76,103 'asset':122 'attach':86 'base':8,25,71,118,125 'base network api' 'beyond':182 'broad':46 'broader':149 'call':4,21 'caller':84 'challeng':111 'classif':158 'classification' 'collect':47 'connect':195 'convers':170 'cost':62 'crypto pay api' 'crypto-data' 'data':51,56 'data-analytics' 'decim':133 'document':181 'embed':159 'embeddings' 'empti':188 'enabl':40 'endpoint':49,61,96,152,204 'equal':127 'essenti':187 'estim':167 'everi':60 'exact':138 'exchang':162 'feed':161 'finance-data' 'finance/web3':55 'gas':166 'generat':172 'geocod':168 'geocoding' 'given':129 'header':90 'howev':180 'individu':203 'infer':54 'key':16,33,77 'land':184 'limit':80 'list':100 'low payment fee' 'lowpaymentfee.com':35 'maxamountrequir':114 'micropayment api' 'network':72 'no-api-key' 'no-auth api' 'offer':44 'page':185,192 'paid':66 'pay':2,19 'pay per call api' 'pay-per-cal':1,18 'pay-per-request' 'payment':89,135 'per':3,20,64 'platform':6,23,42,150 'point':179 'post':107 'premium':102 'price':160,178 'quot':165 'rate':79,163 'request':65,93,108 'request/response':200 'requir':17,34 'schema':201 'scheme':136 'second':142 'sentiment':154 'sentiment-analysis' 'servic':59 'settl':144 'show':194 'signup':83 'simpli':85 'span':50 'specif':95 'sub':191 'sub-pag':190 'summar':157 'text':156 'text-summarization' 'timeout':143 'token':164 'unit':119 'unknown':206 'usdc':9,26,68,121,130 'usdc api' 'usdc-base' 'util':58 'utility-services' 'valid':169 'via':10,27 'wallet':196 'x402':11,28,39,88,110 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"24a6a717-d572-4426-bcfb-595c28cb057b","listingId":"bd1f14d2-278b-4a38-ae05-4e5ca5a981d6","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/payments/235","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:10.584Z"}],"sources":[{"listingId":"bd1f14d2-278b-4a38-ae05-4e5ca5a981d6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/235","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:10.584Z","lastSeenAt":"2026-04-23T04:01:31.374Z"}],"details":{"listingId":"bd1f14d2-278b-4a38-ae05-4e5ca5a981d6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/235 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with exact scheme","source_url":"https://lowpaymentfee.com/api/v1/payments/235"},{"claim":"Platform offers endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes or gas estimates with per-call micropayments","Geocoding or data validation as a utility service paid per request via x402","Programmatic data export or analytics metrics retrieval settled in USDC on Base"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible agents that can attach payment headers automatically","Use cases requiring low-cost ($0.02) per-call pricing with no rate limits"],"notFor":["Users who need detailed API documentation or well-defined request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.879Z"},"updatedAt":"2026-04-23T04:01:31.374Z"}}