{"id":"b3752b42-5e02-4578-b2bf-806214a732d1","shortId":"EYkm3x","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API platform 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 catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no upfront commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint listed here (`/api/v1/transactions/40/receipt`) is labeled \"Premium API Access\" and returns `application/json`. Its x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and is discoverable. The broader platform lists endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point.\n\nDocumentation beyond the landing page is essentially empty (all sub-pages only show a \"Connect wallet\" prompt), so the exact request/response schemas for individual endpoints are unknown. There is no OpenAPI spec, no example payloads, and no detailed parameter documentation available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-prices","exchange-rates","crypto-gas","geocoding","validation","conversion"],"categories":["ai","finance","data","infrastructure"],"synonyms":["low payment fee","x402 API","pay-per-call API","USDC micropayment API","Base network API","402 payment API","micro-transaction API"],"warnings":["No OpenAPI specification or detailed documentation available — all doc/pricing/API sub-pages return only 'Connect wallet'","The exact purpose and expected request body for /api/v1/transactions/40/receipt is undocumented","No example request or response payloads could be found","The breadth of advertised endpoints (AI, finance, analytics, utilities) could not be independently verified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/40/receipt","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/40/receipt","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no example payloads. The specific purpose of the /transactions/40/receipt path is unclear. Effectively a stub 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'/request':18,36 '0.02':17,35,67,138,181 '000':127 '0x8335':132 '20':126 '2913':133 '402 payment API' '6':142 'Base network API' 'USDC micropayment API' 'accept':146 'access':114 'advertis':121 'ai':12,30 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':55 'amount':124 'analysi':159 'analyt':11,29,54 'api':5,23,43,85,113 'application/json':117 'attach':96 'avail':225 'base':8,26,75,128,135 'beyond':185 'broad':48 'broader':153 'call':4,22 'caller':94 'catalog':49 'challeng':120 'classif':162 'commit':93 'connect':199 'convers':174 'conversion' 'cover':10,28 'crawl':228 'crypto-gas' 'data':53,58 'data-analytics' 'decim':143 'detail':222 'discover':151 'document':184,224 'embed':163 'empti':191 'enabl':42 'endpoint':51,63,106,145,156,209 'equal':137 'essenti':190 'estim':171 'everi':62 'exact':204 'exampl':218 'exchang':166 'exchange-rates' 'feed':165 'financ':13,31 'finance-prices' 'finance/web3':57 'gas':170 'general':60 'generat':176 'geocod':172 'geocoding' 'given':139 'header':100 'individu':208 'infer':56 'key':86 'label':111 'land':187 'limit':89 'list':107,155 'low payment fee' 'lowpaymentfee.com':37 'maximum':123 'micro-transaction API' 'network':76 'offer':46 'openapi':215 'page':188,195 'paramet':223 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':219 'payment':80,99 'per':3,21,68 'platform':6,24,44,154 'point':183 'post':147 'premium':112 'price':65,164,182 'prompt':201 'protocol':81 'quot':169 'rate':88,167 'request':69,103,148 'request/response':205 'return':116 'schema':206 'sentiment':158 'settl':70 'show':197 'simpli':95 'span':52 'spec':216 'specif':105 'sub':194 'sub-pag':193 'summar':161 'text':160 'token':168 'unit':129 'unknown':211 'upfront':92 'usdc':9,27,72,131,140 'usdc-base' 'util':15,33,61 'valid':173 'validation' 'via':77 'wallet':200 'x402':41,79,98,119 'x402 API' 'x402-enabled':40 'x402-payment'","prices":[{"id":"52754ed4-dc3a-4a17-9ba1-394eb2be0b3b","listingId":"b3752b42-5e02-4578-b2bf-806214a732d1","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/40/receipt","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:41.739Z"}],"sources":[{"listingId":"b3752b42-5e02-4578-b2bf-806214a732d1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/40/receipt","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:41.739Z","lastSeenAt":"2026-04-22T10:02:28.535Z"}],"details":{"listingId":"b3752b42-5e02-4578-b2bf-806214a732d1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/40/receipt \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/40/receipt"},{"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 platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/40/receipt"}],"useCases":["Querying real-time financial data (prices, exchange rates, gas estimates) with per-call USDC payments","Running AI inference tasks (sentiment analysis, summarization, classification, embeddings) without API key management","Accessing utility services (geocoding, validation, conversion) on a pay-as-you-go basis","Building agent workflows that autonomously purchase API calls via x402 on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle payments autonomously via x402/USDC on Base","Prototyping and low-volume use cases where $0.02/request is cost-effective"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.223Z"},"updatedAt":"2026-04-22T10:02:28.535Z"}}