{"id":"8683489a-674f-42eb-8e39-94c118873ffa","shortId":"HKRnU6","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint at `/api/v1/products/45` is labeled \"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. Payment is via the x402 exact scheme, with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nDocumentation beyond the landing page is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The actual behavior of the `/api/v1/products/45` endpoint (what data it returns, what input it expects) is not documented anywhere in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","402 payment api"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /pricing, /README, /api) render only 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/products/45 ('Premium API Access') is not documented anywhere","No request or response examples available — actual endpoint behavior is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/45","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/products/45","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 is no OpenAPI spec, no request/response schema, and no examples. The purpose of /api/v1/products/45 specifically is undocumented. This is effectively a stub 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'/api/v1/products/45':120,218 '/call':19,38 '/docs':181 '/pricing':182 '/readme':185 '0.02':18,37,95,146 '000':135 '0x8335':140 '20':134 '2913':141 '300':161 '402':129 '402 payment api' '6':150 'accept':166 'access':125 'across':54 'actual':214 'addit':196 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'anywher':231 'api':5,24,45,107,124 'application/json':171 'avail':212 'base':8,27,103,136,143 'base network api' 'behavior':215 'beyond':173 'broad':50 'catalog':51 'categori':56 'challeng':130 'classif':71 'classification' 'commit':115 'connect':191 'content':198 'convers':88 'crawl':234 'data':11,30,57,61,221 'data-analytics' 'decim':151 'document':172,207,230 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,118,165,219 'equal':145 'estim':82 'exact':157 'exampl':211 'exchang':77 'expect':227 'export':62 'extrem':178 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'gas':81 'generat':89 'geocod':86 'geocoding' 'given':147 'infrastructur':84 'input':225 'insight':63 'key':108 'label':122 'land':175 'learn':66 'limit':111 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'materi':235 'metric':59 'micropayment api' 'minimum':114 'network':104 'offer':48 'openapi':202 'page':176,186 'paid':98 'pay':2,21 'pay per call api' 'pay-per-request':1,20 'payment':152 'per':3,22,96 'platform':46 'post':167 'premium':123 'price':75,93 'prompt':193 'quot':80 'rate':78,110 'render':188 'report':60 'request':4,23,97,131,168 'request/response':205 'return':127,170,223 'schema':206 'scheme':158 'second':162 'sentiment':67 'sentiment-analysis' 'spars':179 'spec':203 'specif':117 'suit':6,25 'summar':70 'technic':197 'text':69 'text-summarization' 'timeout':163 'token':79 'unit':137 'usag':210 'usdc':100,139,148 'usdc api' 'usdc-base' 'util':15,34,85 'utility-apis' 'valid':87 'via':9,28,154 'wallet':192 'web3':74 'x402':10,29,43,156 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"6c110838-8b34-4f1c-9bc4-723970a0c1a4","listingId":"8683489a-674f-42eb-8e39-94c118873ffa","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/products/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:13.682Z"}],"sources":[{"listingId":"8683489a-674f-42eb-8e39-94c118873ffa","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:13.682Z","lastSeenAt":"2026-04-22T23:00:57.470Z"}],"details":{"listingId":"8683489a-674f-42eb-8e39-94c118873ffa","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/45 \\\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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/products/45"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages /docs, /pricing, /api, /README all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant, keyless access","Using utility services like geocoding, validation, and conversion via micropayments"],"bestFor":["Agents or applications that need low-friction, keyless API access paid per request","Developers who want to avoid subscription commitments for occasional API calls","Web3-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.447Z"},"updatedAt":"2026-04-22T23:00:57.470Z"}}