{"id":"d31df5e2-a55f-484b-aa8a-3bc94670f153","shortId":"yqvEAH","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 & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/transactions/173` is labeled \"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 given USDC's 6 decimals. Payment is made via the x402 exact scheme with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises 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. However, documentation pages (/docs, /pricing, /api, /README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior, input schemas, and response formats for these endpoints remain undocumented and unverifiable.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["infrastructure","api-platform"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["All documentation pages (/docs, /pricing, /api, /README) returned no useful content — only a 'Connect wallet' prompt.","No OpenAPI or schema documentation is available for any endpoint.","The specific purpose and expected input/output of /api/v1/transactions/173 is unknown — 'Premium API Access' is not descriptive.","The actual functionality behind the advertised AI, finance, and utility endpoints cannot be verified from available materials."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/173","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/173","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, but documentation pages are empty (only 'Connect wallet' stubs). There is no OpenAPI spec, no input/output schema, no examples, and the purpose of this specific '/transactions/173' endpoint is unclear beyond the generic 'Premium API Access' label. The platform lists many endpoints but provides no verifiable documentation for any of 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'/api/v1/transactions/173':87 '/docs':175 '/pricing':176 '/readme':178 '/request':13,28 '0.02':12,27,62,113,169 '000':102 '0x8335':107 '20':101 '2913':108 '300':129 '402':96 '6':117 'accept':134 'access':92 'across':45 'actual':192 'advertis':143 'ai':48 'analysi':147 'analyt':47 'api':5,20,37,74,91 'application/json':139 'base':8,23,70,103,110 'base network api' 'behavior':193 'broader':141 'call':4,19 'categori':56 'challeng':97 'classif':150 'commit':81 'connect':183 'content':189 'convers':162 'data':46 'decim':118 'document':173 'embed':151 'enabl':36 'endpoint':44,58,85,133,144,201 'equal':112 'estim':159 'exact':125 'exchang':154 'feed':153 'financ':51 'format':198 'gas':158 'generat':164 'geocod':160 'given':114 'howev':172 'infrastructur':54 'input':194 'json-response' 'key':75 'label':89 'learn':50 'limit':78 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':49 'made':121 'micropayment api' 'network':9,24,71 'no-api-key' 'offer':40 'page':174 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payabl':65 'payment':119 'per':3,18,63 'platform':6,21,38,142 'point':171 'post':135 'post-method' 'premium':90 'price':60,152,170 'prompt':185 'quot':157 'rate':77,155 'remain':202 'request':64,98,136 'requir':82 'respons':197 'return':94,138,180 'schema':195 'scheme':126 'second':130 'sentiment':146 'specif':84 'substant':188 'summar':149 'text':148 'timeout':131 'token':156 'undocu':203 'unit':104 'unverifi':205 'usdc':15,30,67,106,115 'usdc api' 'usdc-base-network' 'util':55 'valid':161 'varieti':42 'via':10,25,122 'wallet':184 'web3':52 'x402':11,26,35,124 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"cabee5a2-5032-4e0a-91f9-56e72b139447","listingId":"d31df5e2-a55f-484b-aa8a-3bc94670f153","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/173","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:53.403Z"}],"sources":[{"listingId":"d31df5e2-a55f-484b-aa8a-3bc94670f153","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/173","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:53.403Z","lastSeenAt":"2026-04-23T20:33:06.823Z"}],"details":{"listingId":"d31df5e2-a55f-484b-aa8a-3bc94670f153","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/173 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"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 x402 challenge for /api/v1/transactions/173 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/transactions/173"},{"claim":"The platform advertises endpoints for analytics, AI/ML, finance, and infrastructure utilities.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) returned only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Projects already operating on the Base L2 network"],"notFor":["Users who need detailed API documentation and guaranteed SLAs","Applications requiring free or fiat-only payment methods","Production workloads needing well-documented input/output schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.758Z"},"updatedAt":"2026-04-23T20:33:06.823Z"}}