{"id":"6d91f34b-a6df-41dd-bc35-e457731eee7a","shortId":"dhtky2","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/customers/55` is listed as \"Premium API Access\" and returns `application/json` via POST. Its x402 challenge advertises a max amount of 20,000 base units of USDC (asset 0x8335…2913 on Base, 6 decimals), which equals $0.02. The broader platform also exposes 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.\n\nDocumentation is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge captured), but the actual behavior and response format of `/api/v1/customers/55` is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint","crypto-paid api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/customers/55 is labeled 'Premium API Access' but its actual function is unclear — it does not appear in the landing page catalog","Cannot verify what data or service this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/55","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/customers/55","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 x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the purpose of '/api/v1/customers/55' specifically is opaque. The docs pages are empty 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'/api/v1/customers/55':106,230 '/docs':180 '/pricing':181 '/readme':184 '/request':19,38 '0.02':18,37,70,141,172 '000':127 '0x8335':133 '20':126 '2913':134 '402':219 '6':137 'access':112 'actual':224 'advertis':121 'ai':12,31,57 'ai-inference' 'also':145 'amount':124 'analysi':150 'analyt':56 'api':5,24,45,83,111 'application/json':115 'asset':132 'attach':94 'avail':210,234 'base':8,27,78,128,136 'base network api' 'behavior':225 'broad':50 'broader':143 'call':4,23 'caller':92 'captur':221 'catalog':51 'challeng':120,220 'classif':153 'classification' 'commit':91 'confirm':217 'connect':190 'content':196 'convers':165 'conversion' 'cover':10,29 'crawl':213 'crypto-paid api' 'crypto-quotes' 'data':11,30,55 'data-analytics' 'decim':138 'document':175,205 'embed':154 'embeddings' 'enabl':44 'endpoint':16,35,53,66,104,147,215 'equal':140 'estim':162 'everi':65 'exampl':209 'exchang':157 'expos':146 'extrem':177 'feed':156 'financ':13,32,60 'finance-data' 'format':228 'gas':161 'gas-estimates' 'generat':167 'geocod':163 'geocoding' 'header':98 'infrastructur':63 'key':84 'learn':59 'limit':87 'list':108 'live':218 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'materi':235 'max':123 'micropayment api' 'minimum':90 'network':79 'no-api-key endpoint' 'offer':48 'openapi':200 'page':185 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':97 'per':3,22,71 'platform':6,25,46,144 'point':174 'post':117 'premium':110 'price':68,155,173 'prompt':192 'quot':160 'rate':86,158 'render':187 'request':72,101 'request/response':203 'respons':227 'return':114 'schema':204 'sentiment':149 'sentiment-analysis' 'settl':73 'simpli':93 'span':54 'spec':201 'specif':103 'summar':152 'text':151 'text-summarization' 'thin':178 'token':159 'unclear':232 'unit':129 'usag':208 'usdc':9,28,75,131 'usdc api' 'usdc-base' 'util':15,34,64 'valid':164 'validation' 'via':116 'wallet':191 'web3':61 'x402':43,96,119 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f5ded9f6-266e-4498-8047-1a0007f2b3a3","listingId":"6d91f34b-a6df-41dd-bc35-e457731eee7a","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/customers/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:28.865Z"}],"sources":[{"listingId":"6d91f34b-a6df-41dd-bc35-e457731eee7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:28.865Z","lastSeenAt":"2026-04-22T23:00:58.245Z"}],"details":{"listingId":"6d91f34b-a6df-41dd-bc35-e457731eee7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/55 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform offers endpoints at $0.02/request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/55"},{"claim":"Platform lists endpoints for analytics, AI, finance, and utility categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payment","Running AI inference tasks (sentiment, summarization, classification, embeddings) without subscription commitments","Accessing utility services (geocoding, validation, conversion) on a pay-as-you-go basis","Integrating agent-driven workflows that settle API costs in USDC on Base"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access settled on-chain","AI agents that need to autonomously purchase API calls via x402","Projects already operating on Base network with USDC liquidity"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible wallet or USDC holdings","Applications requiring well-documented request/response schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.687Z"},"updatedAt":"2026-04-22T23:00:58.245Z"}}