{"id":"3e6b4a15-e052-43b5-9d3e-9c04f38a3c1b","shortId":"VVNPyH","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 variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers attach a payment header to each request and receive the response immediately.\n\nThe specific endpoint at `/api/v1/transactions/336` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call, consistent with the site's advertised pricing. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform advertises additional endpoints including 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. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual behavior, input schemas, and response formats for these endpoints are unknown. The specific purpose of the `/api/v1/transactions/336` endpoint is not documented beyond its generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","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":["Documentation pages (/docs, /api, /pricing, /README) are all empty — only showing 'Connect wallet'","The specific purpose and expected input/output of /api/v1/transactions/336 ('Premium API Access') is not documented anywhere","No OpenAPI spec, no request/response examples, and no detailed endpoint descriptions available","The platform advertises many endpoints but none have documented schemas or behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/336","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/336","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 challenge with clear pricing. However, documentation is essentially nonexistent — all doc/pricing/API pages render only \"Connect wallet\" with no content. The specific purpose of /api/v1/transactions/336 is undocumented, there is no input/output schema, and no example responses are available. The listing is effectively a 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'/request':13,28 '0.02':12,27,59,135,185 '000':119 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':150 '0x8335':124 '20':118 '2913':125 '300':153 '402 payment api' '6':131 'access':109,234 'across':45 'actual':207 'addit':159 'address':149 'advertis':143,158 'ai-inference' 'ai/ml':48 'analysi':163 'analyt':47 'api':5,20,37,71,108,233 'attach':87 'base':8,23,67,120,127 'base network api' 'behavior':208 'beyond':190,229 'call':4,19,137 'caller':86 'challeng':114 'classif':166 'commit':78 'connect':203 'consist':138 'convers':178 'data':46 'data-analytics' 'decim':132 'document':189,228 'embed':167 'empti':196 'enabl':36 'endpoint':44,55,101,160,216,225 'equal':134 'essenti':195 'estim':175 'exchang':170 'feed':169 'finance-data' 'finance/web3':50 'format':213 'gas':174 'generat':180 'generic':231 'geocod':176 'handl':83 'header':90 'howev':188 'immedi':98 'includ':161 'infer':49 'infrastructur':52 'inlin':85 'input':209 'key':72 'label':235 'land':192 'limit':75 'list':105 'low payment fee' 'lowpaymentfee.com':31 'micropayment api' 'network':9,24,68 'no-api-key' 'offer':40 'page':193,200 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':84,89,145 'per':3,18,60,136 'platform':6,21,38,157 'point':187 'premium':107,232 'price':57,144,168,186 'protocol':82 'purpos':221 'quot':173 'rate':74,171 'receiv':95 'request':61,93,115 'requir':79 'respons':97,212 'return':111 'schema':210 'second':154 'sent':147 'sentiment':162 'show':202 'sinc':128 'site':141 'specif':100,220 'sub':199 'sub-pag':198 'summar':165 'text':164 'timeout':155 'token':172 'unit':121 'unknown':218 'usdc':15,30,64,123,129 'usdc api' 'usdc-base-network' 'use':130 'util':53 'utility-services' 'valid':177 'varieti':42 'via':10,25 'wallet':204 'x402':11,26,35,81,113 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"50516395-538a-4271-a2cf-cb35fe1e5651","listingId":"3e6b4a15-e052-43b5-9d3e-9c04f38a3c1b","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/336","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:14.988Z"}],"sources":[{"listingId":"3e6b4a15-e052-43b5-9d3e-9c04f38a3c1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/336","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:14.988Z","lastSeenAt":"2026-04-22T18:04:31.933Z"}],"details":{"listingId":"3e6b4a15-e052-43b5-9d3e-9c04f38a3c1b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/336 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/336"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use APIs into autonomous agent workflows via x402"],"bestFor":["Developers wanting zero-setup, pay-as-you-go API access","AI agents that can settle payments via x402 on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.5Z"},"updatedAt":"2026-04-22T18:04:31.933Z"}}