{"id":"a7b14ef0-2bc5-477e-95e0-ccdce79e9362","shortId":"ZJCves","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are pay-per-request using the x402 protocol, settling payments 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/12` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The broader platform advertises a uniform $0.02/request price across all its endpoints. Categories of available APIs include: metrics and reports (Data & Analytics), sentiment analysis, text summarization, classification, and embeddings (AI & ML), price feeds, exchange rates, token quotes, and gas estimates (Finance & Web3), and geocoding, validation, conversion, and generation utilities (Infrastructure).\n\nDocumentation is extremely sparse — 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 crawled material. The endpoint is confirmed live (402 challenge captured), but the actual behavior and response format of each API can only be guessed from endpoint names.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment-analysis","text-summarization","text-classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["llm","data","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no api key","serverless api"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All doc pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific endpoint /api/v1/customers/12 has a generic description; its actual function is unclear","No examples or sample responses are available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/12","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/12","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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality of /api/v1/customers/12 is unclear — the name 'Premium API Access' is generic and 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'/api/v1/customers/12':110 '/docs':191 '/pricing':192 '/readme':195 '/request':19,38,142 '0.02':18,37,132,141 '000':126 '20':125 '402':120,231 'access':116 'across':144 'actual':236 'advertis':138 'ai':12,31,165 'ai-sentiment-analysis' 'ai/ml':57 'analysi':159 'analyt':56,157 'api':5,24,45,87,115,151,243 'attach':98 'avail':150,221 'base':8,27,82,127 'base network api' 'behavior':237 'broad':50 'broader':136 'call':4,23,134 'caller':96 'captur':233 'catalog':51 'categori':148 'challeng':121,232 'classif':162 'commit':95 'confirm':229 'connect':201 'content':207 'convers':181 'conversion' 'crawl':224 'data':11,30,55,60,156 'data-analytics' 'document':186,216 'embed':164 'embeddings' 'enabl':44 'endpoint':16,35,53,66,108,147,227,249 'estim':175 'exampl':220 'exchang':169 'exchange-rates' 'extrem':188 'feed':168 'financ':13,32,176 'finance/web3':59 'format':240 'gas':174 'gas-estimates' 'general':62 'generat':183 'geocod':179 'geocoding' 'guess':247 'header':102 'i.e':131 'includ':152 'infer':58 'infrastructur':185 'key':88 'limit':91 'list':112 'live':230 'low payment fee' 'lowpaymentfee.com':39 'materi':225 'metric':153 'micropayment api' 'minimum':94 'ml':166 'name':250 'network':83 'no api key' 'offer':10,29 'openapi':211 'page':196 'pay':2,21,69 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':68 'payment':77,101 'per':3,22,70,133 'platform':6,25,46,137 'premium':114 'price':143,167 'price-feeds' 'prompt':203 'protocol':75 'provid':48 'quot':172 'rate':90,170 'render':198 'report':155 'request':71,105,122 'request/response':214 'respons':239 'return':118 'schema':215 'sentiment':158 'serverless api' 'servic':64 'settl':76 'simpli':97 'span':54 'spars':189 'spec':212 'specif':107 'summar':161 'text':160 'text-classification' 'text-summarization' 'token':171 'uniform':140 'unit':128 'usag':219 'usdc':9,28,79,130 'usdc api' 'usdc-base-network' 'use':72 'util':15,34,63,184 'valid':180 'validation' 'wallet':202 'web3':177 'x402':43,74,100 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0bf0ed4a-2f86-4c93-86f3-16a7cee7dff9","listingId":"a7b14ef0-2bc5-477e-95e0-ccdce79e9362","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:41.713Z"}],"sources":[{"listingId":"a7b14ef0-2bc5-477e-95e0-ccdce79e9362","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:41.713Z","lastSeenAt":"2026-04-23T12:30:48.400Z"}],"details":{"listingId":"a7b14ef0-2bc5-477e-95e0-ccdce79e9362","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/12 \\\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":"Uniform pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/12"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) without managing API keys","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Geocoding or data validation as a lightweight utility service paid in USDC"],"bestFor":["Developers who want instant API access without signup or API key management","Agents and bots that can settle micropayments in USDC on Base","Projects needing low-cost, pay-as-you-go access to diverse API categories"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.079Z"},"updatedAt":"2026-04-23T12:30:48.400Z"}}