{"id":"2b85bd41-7966-4dd6-a989-fa7c4a732e4b","shortId":"S6P5jA","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/357` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 uniformly priced at $0.02 per request.\n\nThe probed endpoint at `/api/v1/payments/357` returned a valid 402 challenge confirming it is live. However, documentation beyond the landing page is essentially empty (all doc/pricing/API pages just show \"Connect wallet\"), so the actual request/response schemas for this specific endpoint are unknown. The endpoint accepts POST requests and returns `application/json`, but what data it provides or what input it expects is not documented in the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation available — all doc/pricing/API pages show only 'Connect wallet'","No input or output schema provided for this endpoint; actual functionality is unknown","The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned","Cannot verify what this endpoint actually does beyond accepting a POST and returning JSON"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/357","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/357","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, documentation is essentially nonexistent — all doc pages render only \"Connect wallet\" with no schema, examples, or explanation of what this specific endpoint actually does. The generic name \"Premium API Access\" and the lack of input/output schema make it a stub-level 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'/request':13,30 '0.02':12,29,69,152 '000':73 '20':72 '402':163 '6':79 'accept':50,198 'access':66 'actual':187 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,15,22,32,42,65,82,110 'application/json':203 'attach':93 'base':8,25,55,74 'base network api' 'beyond':171 'broader':106 'call':4,21,71 'caller':91 'categori':111 'challeng':164 'classif':127 'commit':88 'confirm':165 'connect':183 'convers':144 'cost':68 'crawl':219 'data':113,117,206 'decim':80 'doc/pricing/api':179 'document':170,216 'embed':128 'empti':177 'endpoint':59,147,157,193,197 'essenti':176 'estim':138 'exchang':133 'expect':213 'export':118 'feed':132 'financ':129 'gas':137 'generat':145 'geocod':142 'header':98 'howev':169 'includ':112 'infrastructur':140 'input':211 'insight':119 'json-response' 'key':16,33,83 'land':173 'learn':122 'limit':85 'list':62 'live':168 'low payment fee' 'lowpaymentfee.com':35 'machin':121 'materi':220 'metric':115 'micropayment api' 'multipl':109 'network':56 'no-api-key' 'page':174,180 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,97,103 'per':3,20,40,70,153 'platform':6,23,43,107 'post':199 'post-method' 'premium':64 'premium api access' 'price':131,150 'probe':156 'proof':104 'protocol':48 'provid':208 'quot':136 'rate':84,134 'report':116 'request':41,154,200 'request/response':188 'requir':17,34,90 'return':160,202 'schema':189 'sentiment':123 'show':182 'simpli':92 'specif':58,192 'summar':126 'text':125 'token':135 'uniform':149 'unit':75 'unknown':195 'upfront':87 'usdc':9,26,51,77 'usdc api' 'usdc-base-network' 'use':45 'util':141 'valid':101,143,162 'via':10,27 'wallet':184 'web3':130 'x':96 'x-payment':95 'x402':11,28,47,102 'x402 api' 'x402-payment'","prices":[{"id":"abe72575-54b5-45ea-9779-bc11c7e26d5b","listingId":"2b85bd41-7966-4dd6-a989-fa7c4a732e4b","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/357","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:27.749Z"}],"sources":[{"listingId":"2b85bd41-7966-4dd6-a989-fa7c4a732e4b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/357","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:27.749Z","lastSeenAt":"2026-04-23T11:03:34.955Z"}],"details":{"listingId":"2b85bd41-7966-4dd6-a989-fa7c4a732e4b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/357 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/357"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/357"}],"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 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need frictionless pay-per-call API access without credentials","Users who want to avoid API key management and subscription commitments"],"notFor":["Users who need detailed API documentation or well-defined schemas before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.021Z"},"updatedAt":"2026-04-23T11:03:34.955Z"}}