{"id":"181dc172-8790-4535-b3e8-6877ded46023","shortId":"LfrLfk","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/payments/225` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe platform organizes its endpoints into 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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The x402 challenge is live and well-formed, confirming the endpoint accepts POST requests and pays to address `0x1A2B...85F3` using USDC on Base. However, without documentation on what this specific endpoint actually returns or what input it expects, its practical utility is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","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","micropayment API","x402 API","pay-per-call","USDC API","Base network API","crypto API payments"],"warnings":["No documentation available — all doc/API/pricing/README pages render only 'Connect wallet' with no content","No OpenAPI or schema describing request/response formats for this endpoint","The specific purpose of /api/v1/payments/225 ('Premium API Access') is undefined — it is unclear what it returns","No examples, error codes, or rate limit information available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/225","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/225","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and pricing is clear ($0.02 USDC on Base). However, there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. Docs pages render only 'Connect wallet' with no content. No OpenAPI spec or examples are available. The listing is effectively a 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'/request':19,38,155 '0.02':18,37,86,154 '000':80 '0x1a2b':216 '20':79 '85f3':217 'Base network API' 'USDC API' 'accept':209 'access':74 'actual':230 'address':215 'advertis':96 'ai':12,31,122 'ai-inference' 'analysi':126 'analyt':116 'api':5,24,45,73,90,163 'attach':99 'avail':192 'base':8,27,63,81,221 'base-network' 'broad':50 'call':4,23,88 'caller':97 'catalog':51 'categori':114 'challeng':199 'charg':76 'classif':129 'classification' 'confirm':206 'connect':172 'content':178 'convers':146 'crawl':195 'crypto API payments' 'data':11,30,115,119 'data-analytics' 'doc':162 'document':157,187,224 'embed':130 'embeddings' 'enabl':44 'endpoint':16,35,57,67,111,150,208,229 'estim':140 'exampl':191 'exchang':135 'expect':236 'export':120 'extrem':159 'feed':134 'financ':13,32,131 'finance-data' 'form':205 'four':113 'gas':139 'generat':147 'geocod':144 'geocoding' 'header':103 'howev':222 'i.e':85 'infrastructur':142 'input':234 'insight':121 'key':91 'label':71 'learn':124 'limit':94 'list':149 'live':201 'low payment fee' 'lowpaymentfee.com':39 'machin':123 'materi':196 'metric':117 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':182 'organ':109 'page':167 'pay':2,21,54,213 'pay-per-cal':1,20 'pay-per-call' 'pay-per-request':53 'payment':102 'per':3,22,55,87 'platform':6,25,46,108 'post':210 'practic':238 'premium':72 'price':133,156,164 'prompt':174 'provid':48 'quot':138 'rate':93,136 'readm':166 'render':169 'report':118 'request':56,106,211 'request/response':185 'return':231 'schema':186 'sentiment':125 'sentiment-analysis' 'settl':58 'share':151 'simpli':98 'spars':160 'spec':183 'specif':66,228 'summar':128 'text':127 'text-summarization' 'token':137 'unclear':241 'unit':82 'usag':190 'usdc':9,28,60,84,219 'usdc-settlement' 'use':218 'util':15,34,143,239 'valid':145 'wallet':173 'web3':132 'well':204 'well-form':203 'without':223 'x402':43,101,198 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f25fcbf3-f790-4f89-b538-ce76f6daf7b6","listingId":"181dc172-8790-4535-b3e8-6877ded46023","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/225","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:50.424Z"}],"sources":[{"listingId":"181dc172-8790-4535-b3e8-6877ded46023","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/225","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:50.424Z","lastSeenAt":"2026-04-23T05:01:22.574Z"}],"details":{"listingId":"181dc172-8790-4535-b3e8-6877ded46023","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/225 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/225"},{"claim":"All listed 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 platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/225"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting data with instant pay-per-request billing","Geocoding and data validation utilities paid via USDC on Base"],"bestFor":["Developers who want instant API access without registration or API keys","Agents and bots that can settle payments in USDC on Base via x402","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.826Z"},"updatedAt":"2026-04-23T05:01:22.574Z"}}