{"id":"cc008836-f8f7-4518-8f2b-0fa8290d7a6f","shortId":"Rgzqng","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/charges/195` 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 payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\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. Without OpenAPI specs or usage examples, callers will need to experiment to discover input parameters and output formats.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","no-auth API"],"warnings":["No API documentation available — all doc/pricing/README pages return only 'Connect wallet'","No OpenAPI or schema definitions for any endpoint","The specific functionality of /api/v1/charges/195 ('Premium API Access') is not described anywhere","Request and response formats are completely unknown — callers must guess or experiment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/195","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/195","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 challenge, and the landing page describes the platform's offerings and pricing. However, there is no OpenAPI spec, no documentation, no request/response schemas, and no usage examples — all doc pages are empty. The specific purpose of '/api/v1/charges/195' beyond 'Premium API Access' is 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'/request':13,28 '0.02':12,27,59,130,183 '000':119 '0x8335':124 '20':118 '2913':125 '300':143 '402':113 '6':134 'Base network API' 'USDC API' 'accept':148 'access':109 'across':45 'actual':205 'advertis':157 'ai-inference' 'ai/ml':48 'analysi':161 'analyt':47 'api':5,20,37,71,108 'application/json':153 'attach':87 'base':8,23,67,120,127 'beyond':188 'broader':155 'call':4,19 'caller':86,219 'challeng':114 'classif':164 'classification' 'commit':78 'connect':201 'convers':176 'crypto-quotes' 'data':46 'data-analytics' 'decim':135 'discov':225 'document':187 'embed':165 'embeddings' 'empti':194 'enabl':36 'endpoint':44,55,101,147,158,210 'equal':129 'essenti':193 'estim':173 'exact':140 'exampl':218 'exchang':168 'experi':223 'feed':167 'finance-data' 'finance/web3':50 'format':230 'gas':172 'generat':178 'geocod':174 'geocoding' 'given':131 'handl':83 'header':90 'howev':186 'immedi':98 'individu':209 'infer':49 'infrastructur':52 'inlin':85 'input':226 'key':72 'land':190 'limit':75 'list':105 'low fee API' 'lowpaymentfee.com':31 'micropayment API' 'need':221 'network':9,24,68 'no-auth API' 'offer':40 'openapi':214 'output':229 'page':191,198 'paramet':227 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payabl':62 'payment':84,89,137 'per':3,18,60 'per-request-billing' 'platform':6,21,38,156 'point':185 'post':149 'premium':107 'price':57,166,184 'protocol':82 'quot':171 'rate':74,169 'receiv':95 'request':61,93,115,150 'request/response':206 'requir':79 'respons':97 'return':111,152 'schema':207 'scheme':138 'second':144 'sentiment':160 'sentiment-analysis' 'show':200 'spec':215 'specif':100 'sub':197 'sub-pag':196 'summar':163 'text':162 'text-summarization' 'timeout':145 'token':170 'unit':121 'unknown':212 'usag':217 'usdc':15,30,64,123,132 'usdc-base-network' 'util':53 'utility-services' 'valid':175 'varieti':42 'via':10,25 'wallet':202 'without':213 'x402':11,26,35,81 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"06bd2b6e-fa4f-4340-94d0-2e051d1f2342","listingId":"cc008836-f8f7-4518-8f2b-0fa8290d7a6f","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/195","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:30.882Z"}],"sources":[{"listingId":"cc008836-f8f7-4518-8f2b-0fa8290d7a6f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/195","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:30.882Z","lastSeenAt":"2026-04-23T10:00:47.856Z"}],"details":{"listingId":"cc008836-f8f7-4518-8f2b-0fa8290d7a6f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/195 \\\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 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":"x402 challenge requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/195"},{"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 payment","Geocoding or data validation as a utility service in automated pipelines","Exporting analytics data or generating insights reports on demand"],"bestFor":["AI agents needing keyless, pay-as-you-go API access","Developers who want to avoid subscription commitments for low-volume usage","x402-compatible wallets and agent frameworks on Base network"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation and guaranteed SLAs before integrating","Callers not set up for x402 / USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.179Z"},"updatedAt":"2026-04-23T10:00:47.856Z"}}