{"id":"17476eab-2b62-40df-b865-fd03c1ef741b","shortId":"usUUyG","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of endpoints spanning data analytics, AI/ML inference, finance/crypto data, and utility services. All endpoints are paid per-request at $0.02 each using USDC on the Base network, with no API keys, rate limits, or upfront commitments required. Payment is handled via the x402 protocol: callers attach an X-PAYMENT header to each request to settle in USDC.\n\nThe specific endpoint at `/api/v1/charges/390` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The challenge specifies an exact payment scheme with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises categories including 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). However, documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","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 API","x402 API platform","pay-per-call API","USDC micropayment API","Base network API","402 payment API","no-api-key endpoint"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific functionality of /api/v1/charges/390 ('Premium API Access') is not described anywhere — it may be a generic or placeholder endpoint","No examples of successful responses are available from crawled material","The platform lists many endpoint categories but none could be verified beyond the landing page descriptions"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/390","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/charges/390","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, confirming it accepts USDC payments on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and no examples. The docs/pricing/README pages are all empty (just 'Connect wallet'). The specific purpose of '/api/v1/charges/390' beyond 'Premium API Access' is 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'/request':13,30 '0.02':12,29,68,138 '000':127 '0x8335':132 '20':126 '2913':133 '300':153 '402':121 '402 payment API' '6':142 'Base network API' 'USDC micropayment API' 'accept':158 'access':117 'advertis':167 'ai':177 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':53 'analysi':181 'analyt':52,171 'api':5,15,22,32,41,78,116,214 'application/json':163 'attach':94 'avail':243 'base':8,25,74,128,135 'beyond':205 'broad':46 'broader':165 'call':4,21 'caller':93 'catalog':47 'categori':168 'challeng':122,145 'classif':184 'commit':84 'connect':223 'content':229 'convers':201 'conversion' 'crawl':246 'crypto-gas-estimates' 'data':51,56,170,174 'data-analytics' 'decim':143 'doc':213 'document':204,238 'embed':185 'enabl':40 'endpoint':49,61,109,157 'equal':137 'estim':195 'exact':148 'exampl':242 'exchang':190 'exchange-rates' 'export':175 'extrem':210 'feed':189 'financ':186 'finance-price-feeds' 'finance/crypto':55 'gas':194 'generat':202 'geocod':199 'geocoding' 'given':139 'handl':88 'header':99 'howev':203 'includ':169 'infer':54 'infrastructur':197 'insight':176 'key':16,33,79 'land':207 'learn':179 'limit':81 'list':113 'low payment fee API' 'lowpaymentfee.com':35 'machin':178 'materi':247 'metric':172 'network':9,26,75 'no-api-key endpoint' 'offer':44 'openapi':233 'page':208,218 'paid':63 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':86,98,149 'per':3,20,65 'per-request':64 'per-request-billing' 'platform':6,23,42,166 'post':159 'premium':115 'price':188,215 'prompt':225 'protocol':92 'quot':193 'rate':80,191 'readm':217 'render':220 'report':173 'request':66,102,123,160 'request/response':236 'requir':17,34,85 'return':119,162 'schema':237 'scheme':150 'second':154 'sentiment':180 'servic':59 'settl':104 'span':50 'spars':211 'spec':234 'specif':108 'specifi':146 'substant':228 'summar':183 'text':182 'timeout':155 'token':192 'unit':129 'upfront':83 'usag':241 'usdc':71,106,131,140 'usdc-base-network' 'use':70 'util':58,198 'valid':200 'validation' 'via':10,27,89 'wallet':224 'web3':187 'x':97 'x-payment':96 'x402':11,28,39,91 'x402 API platform' 'x402-enabled':38 'x402-payment'","prices":[{"id":"b2df80a5-2007-4f6f-a8ce-8ae2cdbd378b","listingId":"17476eab-2b62-40df-b865-fd03c1ef741b","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/charges/390","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:19.918Z"}],"sources":[{"listingId":"17476eab-2b62-40df-b865-fd03c1ef741b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/390","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:19.918Z","lastSeenAt":"2026-04-22T16:31:17.297Z"}],"details":{"listingId":"17476eab-2b62-40df-b865-fd03c1ef741b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/390 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/390"},{"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 in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto token quotes and gas estimates via micropayment","Running geocoding or data validation as a utility service with per-call billing","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-setup, keyless API access at low per-call cost","Prototyping workflows that need diverse API capabilities without subscription commitments"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integration","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.907Z"},"updatedAt":"2026-04-22T16:31:17.297Z"}}