{"id":"eba34b9b-9599-4352-9360-189f19e51544","shortId":"XT9LpY","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/transactions/169` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys or rate limits required — callers simply attach an X-PAYMENT header to each POST request.\n\nDocumentation is extremely sparse. The landing page lists available endpoints and pricing, but the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples. The actual functionality behind the `/api/v1/transactions/169` path is unclear — the generic \"Premium API Access\" label does not describe what data or service it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","402 payment required","crypto api gateway"],"warnings":["No OpenAPI spec or schema documentation available","The /docs, /pricing, /api, and /README pages contain no useful content — only a 'Connect wallet' prompt","The specific functionality of /api/v1/transactions/169 ('Premium API Access') is not described anywhere","No request body schema or response schema is documented, making integration speculative","The broad catalog of endpoints listed on the homepage cannot be individually verified from the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/169","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/transactions/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schemas, and the specific purpose of /api/v1/transactions/169 is undefined beyond the generic label 'Premium API Access'. All doc pages return only 'Connect wallet' with no 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'/api/v1/transactions/169':112,218 '/call':12,31 '/docs':182 '/pricing':183 '/readme':186 '0.02':11,30,98,139 '000':128 '0x8335':133 '20':127 '2913':134 '402 payment required' 'access':118,226 'across':58 'actual':214 'addit':197 'advertis':123 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,117,150,225 'attach':158 'avail':176 'base':8,27,106,129,136 'base usdc api' 'base-network' 'behind':216 'broad':50 'caller':156 'catalog':51 'categori':60 'challeng':122 'classif':75 'classification' 'connect':192 'convers':91 'crypto api gateway' 'data':14,33,61,65,232 'data-analytics' 'describ':230 'detail':199 'document':168,208 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,94,110,177 'equal':138 'estim':86 'exact':146 'exampl':212 'exchang':81 'export':66 'extrem':170 'feed':80 'financ':16,35,77 'finance-data' 'four':59 'function':215 'gas':85 'generat':92 'generic':223 'geocod':89 'geocoding' 'header':163 'infrastructure/utilities':88 'insight':67 'key':151 'label':227 'land':173 'learn':70 'limit':154 'list':114,175 'low payment fee' 'lowpaymentfee.com':39 'machin':69 'made':142 'maxamountrequir':125 'metric':63 'micropayment api' 'network':107 'no-api-key' 'offer':48 'openapi':203 'page':174,187 'path':219 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':140,162 'per':3,22,55,99 'platform':6,25,46 'post':166 'premium':116,224 'price':79,96,179 'prompt':194 'quot':84 'rate':82,153 'render':189 'report':64 'request':4,23,56,100,167 'request/response':206 'requir':155 'return':236 'schema':207 'scheme':147 'sentiment':71 'sentiment-analysis' 'servic':234 'settl':101 'simpli':157 'spars':171 'spec':204 'specif':109 'summar':74 'technic':198 'text':73 'text-summarization' 'token':83 'unclear':221 'unit':130 'usag':211 'usdc':103,132 'usdc-settlement' 'util':18,37 'valid':90 'via':9,28,143 'wallet':193 'web3':78 'x':161 'x-payment':160 'x402':10,29,43,121,145 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"5a50b604-f0b7-48c4-a211-f92b2d523be7","listingId":"eba34b9b-9599-4352-9360-189f19e51544","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/transactions/169","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:52.770Z"}],"sources":[{"listingId":"eba34b9b-9599-4352-9360-189f19e51544","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/169","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:52.770Z","lastSeenAt":"2026-04-22T21:31:36.927Z"}],"details":{"listingId":"eba34b9b-9599-4352-9360-189f19e51544","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/169 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transactions/169 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/169"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations such as geocoding, validation, and data conversion with micropayments","Integrating pay-as-you-go analytics and data export into agent workflows"],"bestFor":["Developers wanting instant API access without registration or API keys","AI agents that can settle x402 micropayments in USDC on Base","Projects needing low-cost, no-commitment access to diverse utility endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.874Z"},"updatedAt":"2026-04-22T21:31:36.927Z"}}