{"id":"37bea876-a9b9-4535-970a-96fe6b3f8239","shortId":"yXHn9N","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/transactions/328` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers 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 listed at the same $0.02/request price point and settle in USDC on Base.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The specific functionality behind the `/api/v1/transactions/328` endpoint is unclear beyond its \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","web3-data","geocoding","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no technical content","The specific functionality of /api/v1/transactions/328 ('Premium API Access') is not described anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/328","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/328","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no clarity on what 'Premium API Access' at /api/v1/transactions/328 actually returns. This is effectively a stub 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'/api/v1/transactions/328':57,212 '/docs':171 '/pricing':173 '/readme':175 '/request':13,28,157 '0.02':12,27,79,156 '000':73 '20':72 '402':67 '402 payment api' 'accept':46 'access':63,93,220 'across':113 'advertis':84 'ai':123 'ai-inference' 'analysi':127 'analyt':117 'api':5,20,38,62,86,219 'attach':96 'avail':202 'base':8,23,51,74,165 'base network api' 'behind':210 'beyond':216 'broader':109 'call':4,19,81 'caller':94 'categori':115 'challeng':68 'classif':130 'connect':181 'convers':147 'crawl':205 'data':116,120 'data-analytics' 'detail':188 'document':166,197 'embed':131 'endpoint':55,112,150,213 'estim':141 'exampl':201 'exchang':136 'export':121 'extrem':168 'feed':135 'financ':132 'finance-data' 'four':114 'function':209 'gas':140 'generat':148 'geocod':145 'geocoding' 'header':101 'i.e':78 'infrastructur':143 'insight':122 'instant':92 'key':87 'label':221 'learn':125 'limit':90 'list':59,152 'low payment fee' 'lowpaymentfee.com':31 'machin':124 'materi':206 'metric':118 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':111 'openapi':192 'page':176 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,100,106 'per':3,18,36,80 'platform':6,21,39,83,110 'point':159 'premium':61,218 'price':134,158 'prompt':183 'proof':107 'protocol':44 'quot':139 'rate':89,137 'render':178 'report':119 'request':37,69 'request/response':195 'return':65 'schema':196 'sentiment':126 'settl':161 'simpli':95 'spars':169 'spec':193 'specif':54,208 'summar':129 'technic':187 'text':128 'token':138 'unclear':215 'unit':75 'usag':200 'usdc':15,30,47,77,163 'usdc api' 'usdc-base' 'use':41 'util':144 'utility-services' 'valid':104,146 'via':10,25 'wallet':182 'web3':133 'web3-data' 'x':99 'x-payment':98 'x402':11,26,43,105 'x402 api' 'x402-payment'","prices":[{"id":"f2e95848-4bb9-4793-863c-fc474e4c8c23","listingId":"37bea876-a9b9-4535-970a-96fe6b3f8239","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/328","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:07.700Z"}],"sources":[{"listingId":"37bea876-a9b9-4535-970a-96fe6b3f8239","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/328","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:07.700Z","lastSeenAt":"2026-04-22T18:32:34.298Z"}],"details":{"listingId":"37bea876-a9b9-4535-970a-96fe6b3f8239","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/328 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/328"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/328"}],"useCases":["Accessing data analytics and reports on a per-request basis without subscription","Running AI inference tasks (sentiment, summarization, classification, embeddings) with per-call USDC payments","Fetching financial data like exchange rates, token quotes, and gas estimates","Geocoding and data conversion utilities paid per use"],"bestFor":["Developers who want API access without managing API keys or subscriptions","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who prefer pay-as-you-go pricing"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime","Users who need detailed API documentation or response schema guarantees before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.838Z"},"updatedAt":"2026-04-22T18:32:34.298Z"}}