{"id":"33584a0c-37d5-4357-a7cd-a6b43083c686","shortId":"zE8mkp","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/160` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 protocol's `X-PAYMENT` header.\n\nThe wider platform advertises four endpoint categories: 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 listed endpoints share the same $0.02/request pricing.\n\nImportant caveats: the specific `/api/v1/inbox/160` endpoint's purpose is unclear — it does not match any of the named endpoints on the landing page, and no OpenAPI schema, request/response examples, or detailed documentation were found. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional content. Treat this listing as a stub until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The endpoint path /api/v1/inbox/160 does not correspond to any named endpoint on the landing page; its actual functionality is unknown.","No OpenAPI spec, request schema, or response schema is available.","Docs, pricing, and README pages returned only 'Connect wallet' with no usable content.","No SLA, rate-limit, or uptime guarantees are documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/160","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/inbox/160","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but the specific resource /api/v1/inbox/160 has no documentation, no schema, no examples, and its purpose ('Premium API Access') is generic. The broader site lists many endpoints but provides no request/response specs. Effectively a 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'/request':19,38,160 '0.02':18,37,80,159 '000':84 '20':83 '402 payment api' '6':90 'access':75 'addit':212 'advertis':99,116 'ai':12,31,127 'analysi':131 'analyt':121 'api':5,24,45,74,93 'base':8,27,63,85 'base network api' 'base-network' 'broad':50 'call':4,23,82 'caller':100 'catalog':51 'categori':119 'caveat':163 'classif':134 'connect':207 'content':213 'convers':151 'cost':77 'crawl':197 'data':11,30,120,124 'decim':91 'detail':192 'doc':198 'document':193,222 'embed':135 'enabl':44 'endpoint':16,35,57,67,118,155,167,180 'estim':145 'exampl':190 'exchang':140 'export':125 'feed':139 'financ':13,32,136 'found':195 'four':117 'gas':144 'generat':152 'geocod':149 'header':112 'import':162 'infrastructur':147 'insight':126 'json-response' 'key':94 'land':183 'learn':129 'limit':97 'list':71,154,216 'low payment fee' 'lowpaymentfee.com':39 'machin':128 'match':175 'metric':122 'micropayment api' 'name':179 'network':64 'no-api-key' 'offer':10,29 'openapi':187 'page':184,202 'pay':2,21,54,101 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':111 'per':3,22,55,81,102 'platform':6,25,46,115 'premium':73 'price':138,161,199 'prompt':209 'protocol':107 'provid':48 'purpos':169 'quot':143 'rate':96,141 'readm':201 'report':123 'request':56,103 'request/response':189 'return':204 'schema':188 'sentiment':130 'settl':58 'share':156 'specif':66,165 'stub':219 'summar':133 'surfac':223 'text':132 'token':142 'treat':214 'unclear':171 'unit':86 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,148 'valid':150 'via':104 'wallet':208 'web3':137 'wider':114 'x':110 'x-payment':109 'x402':43,106 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f7e5fe1c-d144-4db7-9957-6ba46a2b681a","listingId":"33584a0c-37d5-4357-a7cd-a6b43083c686","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/inbox/160","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.790Z"}],"sources":[{"listingId":"33584a0c-37d5-4357-a7cd-a6b43083c686","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/160","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.790Z","lastSeenAt":"2026-04-22T04:02:46.219Z"}],"details":{"listingId":"33584a0c-37d5-4357-a7cd-a6b43083c686","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/160 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/v1/inbox/160"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network.","source_url":"https://lowpaymentfee.com/api/v1/inbox/160"}],"useCases":["Programmatic access to data, AI, finance, or utility endpoints without managing API keys","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Prototyping integrations where per-call pricing avoids subscription commitments"],"bestFor":["Developers or agents wanting zero-commitment, pay-as-you-go API access","x402-compatible wallets and agents on the Base network","Low-volume or bursty workloads where flat subscriptions are wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime (none documented)","Users who need detailed API documentation or schema validation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.886Z"},"updatedAt":"2026-04-22T04:02:46.219Z"}}