{"id":"e16041ef-8410-4da6-917f-769375cf4f6a","shortId":"E8UXSr","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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network, with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transactions/374` 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 per call (USDC uses 6 decimals).\n\nThe platform advertises four categories of APIs: 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 are priced uniformly at $0.02 per request. Payment is handled via the x402 protocol's exact scheme, settling on the Base L2 network.\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 endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what request body to send or what response to expect for this particular transaction endpoint.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected request/response format of /api/v1/transactions/374 is undocumented","The broad catalog of advertised endpoints (AI, finance, data, utils) cannot be verified for actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/374","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/374","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of '/api/v1/transactions/374' is unclear beyond the generic 'Premium API Access' 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'/api/v1/transactions/374':84 '/docs':187 '/pricing':189 '/readme':191 '/request':13,28 '0.02':12,27,111,163 '000':100 '0x8335':105 '20':99 '2913':106 '402':94,227 '6':116 'Base network API' 'USDC API' 'access':90 'advertis':120 'ai':132 'ai-inference' 'ai/ml':49 'analysi':136 'analyt':48,126 'api':5,20,37,71,89,124 'avail':217 'base':8,23,67,101,108,179 'bodi':242 'broad':42 'call':4,19,113 'captur':229 'catalog':43 'categori':122 'challeng':95,228 'classif':139 'classification' 'commit':78 'confirm':225 'connect':197 'content':203 'convers':156 'crawl':220 'crypto-paid API' 'crypto-quotes' 'data':47,52,125,129 'data-analytics' 'decim':117 'difficult':237 'document':182,212,234 'embed':140 'embeddings' 'enabl':36 'endpoint':45,57,82,223,254 'equal':110 'estim':150 'exact':174 'exampl':216 'exchang':145 'expect':249 'export':130 'extrem':184 'feed':144 'financ':141 'finance-data' 'finance/web3':51 'four':121 'gas':149 'generat':157 'geocod':154 'geocoding' 'handl':168 'infer':50 'infrastructur':152 'insight':131 'key':72 'know':239 'l2':180 'lack':232 'learn':134 'limit':75 'list':86 'live':226 'low fee API' 'lowpaymentfee.com':31 'machin':133 'make':235 'materi':221 'metric':127 'micropayment API' 'network':9,24,68,181 'no-api-key' 'offer':40 'openapi':207 'page':192 'paid':59 'particular':252 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'payment':166 'per':3,18,61,112,164 'per-request':60 'per-request-billing' 'platform':6,21,38,119 'premium':88 'price':143,160 'prompt':199 'protocol':172 'quot':148 'rate':74,146 'render':194 'report':128 'request':62,96,165,241 'request/response':210 'requir':79 'respons':247 'return':92 'schema':211 'scheme':175 'send':244 'sentiment':135 'sentiment-analysis' 'servic':55 'settl':176 'span':46 'spars':185 'spec':208 'specif':81 'summar':138 'text':137 'text-summarization' 'token':147 'transact':253 'uniform':161 'unit':102 'usag':215 'usdc':15,30,64,104,114 'usdc-base' 'use':63,115 'util':54,153 'valid':155 'via':10,25,169 'wallet':198 'web3':142 'x402':11,26,35,171 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e653bff4-c23b-479f-8c61-d1b4663f270d","listingId":"e16041ef-8410-4da6-917f-769375cf4f6a","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/374","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:27.678Z"}],"sources":[{"listingId":"e16041ef-8410-4da6-917f-769375cf4f6a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/374","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:27.678Z","lastSeenAt":"2026-04-22T10:32:22.654Z"}],"details":{"listingId":"e16041ef-8410-4da6-917f-769375cf4f6a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/374 \\\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":"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":"402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/374"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no further 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 data analytics queries and exporting data with per-request USDC micropayments","Using utility services like geocoding and validation without rate limits or subscriptions"],"bestFor":["Agents and developers who want instant API access without registration or API keys","Crypto-native workflows that can pay per-call in USDC on Base","Low-volume or bursty usage patterns where subscription pricing is wasteful"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.808Z"},"updatedAt":"2026-04-22T10:32:22.654Z"}}