{"id":"7be1a56a-44b3-4f3d-b7ba-a9a105838bfb","shortId":"2NFzSR","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, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/transactions/43` is labeled \"Premium API Access\" and returns an x402 challenge requesting payment of 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, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual functionality behind each endpoint is unverified. The specific behavior of the `/api/v1/transactions/43` endpoint is not documented beyond its title.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["infrastructure","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no substantive content — only 'Connect wallet' prompts.","The specific functionality of /api/v1/transactions/43 ('Premium API Access') is completely undocumented.","No OpenAPI spec, request schema, or response schema is available for any endpoint.","The broad range of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified from available material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/43","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/43","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, but documentation pages are empty (only 'Connect wallet'). There is no OpenAPI schema, no request/response examples, and no description of what '/api/v1/transactions/43' actually returns. The platform lists many endpoints but provides no verifiable detail about any of 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'/request':13,28 '0.02':12,27,62,111,163 '000':100 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':128 '0x8335':105 '20':99 '2913':106 '300':131 '402 payment api' '6':115 'access':90 'across':45 'actual':184 'address':127 'advertis':137 'ai':48 'analysi':141 'analyt':47 'api':5,20,37,74,89 'base':8,23,70,101,108 'base network api' 'behavior':193 'behind':186 'beyond':201 'broader':135 'call':4,19 'categori':56 'challeng':95 'classif':144 'commit':79 'connect':175 'content':181 'convers':156 'data':46 'decim':116 'doc':169 'document':167,200 'embed':145 'enabl':36 'endpoint':44,58,83,138,188,197 'equal':110 'estim':153 'exact':123 'exchang':148 'feed':147 'financ':51 'function':185 'gas':152 'generat':158 'geocod':154 'given':112 'howev':166 'infrastructur':54 'json-response' 'key':75 'label':87 'learn':50 'limit':77 'low payment fee' 'lowpaymentfee.com':31 'machin':49 'made':119 'micropayment api' 'network':9,24,71 'no-api-key' 'offer':40 'page':168 'paid':65 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':97,117 'per':3,18,63 'platform':6,21,38,136 'point':165 'post-method' 'premium':88 'price':60,146,164,170 'prompt':177 'quot':151 'rate':76,149 'readm':171 'request':64,96 'requir':80 'return':92,172 'scheme':124 'second':132 'sentiment':140 'settl':125 'specif':82,192 'substant':180 'summar':143 'text':142 'timeout':133 'titl':203 'token':150 'unit':102 'unverifi':190 'usdc':15,30,67,104,113 'usdc api' 'usdc-base' 'util':55 'valid':155 'varieti':42 'via':10,25,120 'wallet':176 'web3':52 'x402':11,26,35,94,122 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"b350c4d8-2096-4e25-b299-9f090f742368","listingId":"7be1a56a-44b3-4f3d-b7ba-a9a105838bfb","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:45.415Z"}],"sources":[{"listingId":"7be1a56a-44b3-4f3d-b7ba-a9a105838bfb","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:45.415Z","lastSeenAt":"2026-04-22T17:02:18.183Z"}],"details":{"listingId":"7be1a56a-44b3-4f3d-b7ba-a9a105838bfb","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/43 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/43"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/43"},{"claim":"Platform advertises endpoints for analytics, AI, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to utility APIs without needing API key registration","Agent-driven workflows that pay per call using USDC on Base","Exploring x402 payment protocol integration patterns"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","AI agents that need keyless, on-demand API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring documented SLAs and detailed API schemas","Users without a Base-network USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:37.01Z"},"updatedAt":"2026-04-22T17:02:18.183Z"}}