{"id":"b2737e99-0db2-4777-8ac0-04825e3f1b74","shortId":"pgkseh","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an X-PAYMENT header with a valid payment proof to each request.\n\nThe specific endpoint at `/api/v1/payments/231` 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 platform also advertises AI endpoints (sentiment analysis, text summarization, classification, embeddings), finance endpoints (price feeds, exchange rates, token quotes, gas estimates), data endpoints (metrics, reports, export, insights), and utility endpoints (geocoding, validation, conversion, generation). Documentation pages exist but appear to require a wallet connection to view, so detailed request/response schemas are not available from the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","analytics-api","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","gas-estimates","geocoding","data-export","no-api-key"],"categories":["ai","finance","data","utilities"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no visible content — actual API docs may be gated behind wallet authentication.","The specific purpose of /api/v1/payments/231 ('Premium API Access') is unclear; it does not match any of the named endpoints on the homepage.","No request or response schemas are available; input/output formats are unknown.","No OpenAPI spec or ai-plugin manifest was found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/231","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/231","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation pages all require wallet connection and yield no content, so there are no request/response schemas, no examples, and no details about what this specific 'Premium API Access' endpoint actually returns. The broad API catalog is listed on the homepage but individual endpoint behavior is undocumented in the 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'/request':18,36 '0.02':17,35,67,140 '000':129 '0x8335':134 '20':128 '2913':135 '300':153 '402':123 '402 payment api' '6':144 'accept':158 'access':119 'advertis':167 'ai':12,30,168 'ai-inference' 'ai/ml':55 'also':166 'analysi':171 'analyt':11,29,54 'analytics-api' 'api':5,23,43,84,118 'appear':203 'application/json':163 'attach':95 'avail':217 'base':8,26,75,130,137 'base network api' 'broad':48 'call':4,22 'caller':93 'challeng':124 'classif':174 'classification' 'collect':49 'commit':92 'connect':208 'convers':197 'cover':10,28 'crawl':220 'crypto-quotes' 'data':53,58,186 'data-export' 'decim':145 'detail':212 'document':199 'embed':175 'embeddings' 'enabl':42 'endpoint':51,63,111,157,169,177,187,194 'equal':139 'estim':185 'everi':62 'exact':150 'exchang':180 'exist':201 'export':190 'feed':179 'financ':13,31,176 'finance-data' 'finance/web3':57 'gas':184 'gas-estimates' 'general':60 'generat':198 'geocod':195 'geocoding' 'given':141 'header':100 'infer':56 'insight':191 'key':85 'limit':88 'list':115 'low payment fee' 'lowpaymentfee.com':37 'metric':188 'micropayment api' 'network':76 'no-api-key' 'offer':46 'page':200 'paid':70 'pay':2,20 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':99,104,147 'per':3,21,68 'platform':44,165 'post':159 'premium':117 'price':65,178 'proof':105 'protocol':80 'quot':183 'rate':87,181 'report':189 'request':69,108,125,160 'request/response':213 'requir':205 'return':121,162 'schema':214 'scheme':148 'second':154 'sentiment':170 'sentiment-analysis' 'simpli':94 'span':52 'specif':110 'suit':6,24 'summar':173 'text':172 'text-summarization' 'timeout':155 'token':182 'unit':131 'upfront':91 'usdc':9,27,72,133,142 'usdc api' 'usdc-base' 'util':15,33,61,193 'valid':103,196 'via':77 'view':210 'wallet':207 'x':98 'x-payment':97 'x402':41,79 'x402 api' 'x402-enabled':40 'x402-payment'","prices":[{"id":"52f48f09-dcd4-40d4-b1bc-332c1af5faa3","listingId":"b2737e99-0db2-4777-8ac0-04825e3f1b74","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/231","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:05.740Z"}],"sources":[{"listingId":"b2737e99-0db2-4777-8ac0-04825e3f1b74","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/231","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:05.740Z","lastSeenAt":"2026-04-22T15:01:37.047Z"}],"details":{"listingId":"b2737e99-0db2-4777-8ac0-04825e3f1b74","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/231 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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, 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/payments/231"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment scheme is 'exact' with maxTimeoutSeconds of 300","source_url":"https://lowpaymentfee.com/api/v1/payments/231"}],"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","Running analytics queries or exporting data sets with no subscription commitment","Geocoding or data validation as a utility microservice in automated pipelines","Embedding generation for RAG or search workflows paid per request"],"bestFor":["AI agents that need keyless, pay-as-you-go access to diverse API capabilities","Developers prototyping with multiple API categories without subscription overhead","Web3-native applications already holding USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.08Z"},"updatedAt":"2026-04-22T15:01:37.047Z"}}