{"id":"1550f1ee-dc9f-4fed-88e7-685df90ba95a","shortId":"7EZLrb","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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 `/api/v1/payments/179` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, rate limits, or upfront commitments are required — each request is individually settled on-chain.\n\nThe broader platform advertises multiple API categories including 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.\n\nHowever, the specific endpoint probed here (`/api/v1/payments/179`) does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access,\" and no further documentation, request/response schemas, or examples are available. The docs, pricing, and other pages on the site returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what this endpoint actually returns, agents should treat it as an opaque paid endpoint with uncertain functionality.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — docs, pricing, and README pages all return only a 'Connect wallet' prompt with no content.","The endpoint path '/api/v1/payments/179' does not match any of the documented API categories on the homepage; its actual functionality is unknown.","No request or response schema is provided; callers cannot know what to send or what to expect back.","No OpenAPI spec, ai-plugin manifest, or agents.txt discovered."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/179","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/payments/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, and no explanation of what 'Premium API Access' actually returns. The docs pages are empty. This is effectively a stub 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'/request':13,30,148 '0.02':12,29,78,147 '000':72 '20':71 '402 payment api' 'accept':50 'access':66,175 'actual':210 'advertis':102 'agent':212 'ai':114 'analysi':118 'analyt':108 'api':5,15,22,32,42,65,82,104,167,174 'avail':185 'base':8,25,55,73 'base network api' 'broader':100 'call':4,21,80 'categori':105,168 'chain':98 'charg':68 'classif':121 'clear':160 'commit':88 'connect':198 'content':204 'convers':138 'data':107,111 'descript':170 'doc':187 'document':166,179 'embed':122 'endpoint':59,141,154,209,220 'estim':132 'exampl':183 'exchang':127 'export':112 'feed':126 'financ':123 'function':223 'gas':131 'generat':139 'geocod':136 'howev':151 'i.e':77 'includ':106 'individu':94 'infrastructur':134 'insight':113 'json-response' 'key':16,33,83 'know':206 'learn':116 'limit':85 'list':62,143 'low payment fee' 'lowpaymentfee.com':35 'machin':115 'map':161 'metric':109 'micropayment api' 'multipl':103 'network':56 'no-api-key' 'on-chain':96 'opaqu':218 'page':191 'paid':219 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52 'per':3,20,40,79 'platform':6,23,43,101 'point':150 'premium':64,173 'price':125,149,188 'probe':155 'prompt':200 'protocol':48 'quot':130 'rate':84,128 'report':110 'request':41,92 'request/response':180 'requir':17,34,90 'return':195,211 'schema':181 'sentiment':117 'settl':95 'simpli':172 'site':194 'specif':58,153 'substant':203 'summar':120 'text':119 'token':129 'treat':214 'uncertain':222 'unit':74 'upfront':87 'usdc':9,26,51,76 'usdc api access' 'usdc-base' 'use':45 'util':135 'valid':137 'via':10,27 'wallet':199 'web3':124 'without':205 'x402':11,28,47 'x402 api' 'x402-payment'","prices":[{"id":"08c130e0-ced8-47ad-9954-bca0376d44c0","listingId":"1550f1ee-dc9f-4fed-88e7-685df90ba95a","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/payments/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:40.911Z"}],"sources":[{"listingId":"1550f1ee-dc9f-4fed-88e7-685df90ba95a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:40.911Z","lastSeenAt":"2026-04-22T23:01:41.832Z"}],"details":{"listingId":"1550f1ee-dc9f-4fed-88e7-685df90ba95a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/179 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/179"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/179"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages return only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a paid API endpoint without needing API key registration","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, on-chain-settled API access","Low-cost per-request API consumption without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Anyone without a Base-network USDC wallet","High-throughput use cases where per-call on-chain settlement adds latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.17Z"},"updatedAt":"2026-04-22T23:01:41.832Z"}}