{"id":"ba5b1469-3cce-4a9b-9924-90b63512185b","shortId":"sUqu8L","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 set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network through the x402 payment protocol, meaning no API keys, accounts, or subscriptions are needed — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/payments/150` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing. Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises additional endpoints across four categories: 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 (geocoding, validation, conversion, generation). All are listed at the same $0.02/request price point. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail, schemas, or usage examples.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","no-auth api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty beyond a 'Connect wallet' prompt — no technical docs available","No OpenAPI schema, request/response examples, or error documentation found","The specific purpose of /api/v1/payments/150 ('Premium API Access') is unclear — it does not map to any of the named endpoints on the landing page","No information on rate limits, uptime guarantees, or data sources"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/150","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/150","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 with clear pricing. However, documentation is essentially nonexistent — all doc/pricing/README pages show only 'Connect wallet'. There are no request/response schemas, no usage examples, and no description of what the 'Premium API Access' endpoint actually returns. The platform's purpose and individual endpoint behaviors must be inferred entirely from the landing page 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'/request':13,30,205 '0.02':12,29,133,204 '000':116 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':152 '0x8335':121 '20':115 '2913':122 '300':155 '402':110 '402 payment api' '6':128 'access':106 'account':82 'across':163 'addit':161 'address':151 'advertis':141,160 'ai':173 'ai-inference' 'ai/ml':53 'analysi':177 'analyt':52,167 'api':5,15,22,32,41,80,105,215 'attach':89 'base':8,25,71,117,124 'base network api' 'broad':46 'call':4,21 'caller':87 'categori':165 'chain':149 'challeng':111 'classif':180 'classification' 'connect':224 'consist':136 'convers':196 'crypto-quotes' 'data':51,56,166,170 'data-analytics' 'decim':129 'detail':231 'doc':214 'document':209 'embed':181 'embeddings' 'enabl':40 'endpoint':49,61,98,162 'estim':191 'exampl':235 'exchang':186 'export':171 'extrem':211 'feed':185 'financ':182 'finance-data' 'finance/web3':55 'flat':142 'four':164 'gas':190 'generat':197 'geocod':194 'geocoding' 'header':92 'howev':208 'infer':54 'infrastructur':193 'insight':172 'key':16,33,81 'learn':175 'list':102,200 'low payment fee' 'lowpaymentfee.com':35 'machin':174 'mean':78 'metric':168 'micropayment api' 'need':86 'network':9,26,72 'no-api-key' 'no-auth api' 'offer':44 'on-chain':147 'page':219 'paid':63 'pay':2,19 'pay per call api' 'pay-per-cal':1,18 'payment':76,91,144 'per':3,20,65,134 'per-request':64 'per-request-billing' 'platform':6,23,42,159 'point':207 'premium':104 'price':143,184,206,216 'prompt':226 'protocol':77 'quot':189 'rate':187 'readm':218 'render':221 'report':169 'request':66,95,112,135 'requir':17,34 'return':108 'schema':232 'second':156 'sentiment':176 'sentiment-analysis' 'servic':59 'set':47 'settl':146 'simpli':88 'sinc':125 'site':139 'span':50 'spars':212 'specif':97 'subscript':84 'summar':179 'technic':230 'text':178 'text-summarization' 'timeout':157 'token':188 'translat':131 'unit':118 'usag':234 'usdc':68,120,126 'usdc api access' 'usdc-base' 'use':67,127 'util':58 'utility-services' 'valid':195 'via':10,27 'wallet':225 'web3':183 'x402':11,28,39,75 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"469d1f5e-a559-46be-b45f-eb8eeb189f62","listingId":"ba5b1469-3cce-4a9b-9924-90b63512185b","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/150","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:35.955Z"}],"sources":[{"listingId":"ba5b1469-3cce-4a9b-9924-90b63512185b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/150","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:35.955Z","lastSeenAt":"2026-04-22T15:01:34.627Z"}],"details":{"listingId":"ba5b1469-3cce-4a9b-9924-90b63512185b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/150 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/payments/150 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/150"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API consumption without pre-registration or API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) with per-call payment","Fetching real-time financial data (prices, exchange rates, gas estimates) via micropayments","Geocoding and data validation utilities paid per request"],"bestFor":["AI agents that need frictionless, keyless API access via crypto micropayments","Developers prototyping with pay-as-you-go endpoints on Base","Applications requiring low-cost per-call billing without subscriptions"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without USDC on Base network or unfamiliar with x402 payment protocol","Use cases requiring detailed API schemas, error handling docs, or response format guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.4Z"},"updatedAt":"2026-04-22T15:01:34.627Z"}}