{"id":"06588cc4-fc2d-48d2-962e-4320ac30fbea","shortId":"cBUwXc","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 exposes a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/77` 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 accounts are required — callers authenticate and pay via the x402 protocol's `X-PAYMENT` header.\n\nThe wider platform advertises four endpoint families: Data & Analytics (metrics, reports, 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 with no rate limits or minimum commitments.\n\nNote that the specific functionality behind `/api/v1/inbox/77` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" prompt with no additional detail. Treat this listing as a gateway to the platform's capabilities, but verify the actual behavior of this particular inbox endpoint before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","USDC pay-per-call","Base network API","micropayment API","pay-as-you-go API"],"warnings":["The specific purpose of /api/v1/inbox/77 ('Premium API Access') is not documented — it is unclear what data or service it returns.","No OpenAPI or JSON schema is available for any endpoint on the platform.","Documentation pages (/api, /pricing, /README) all resolve to a minimal 'Connect wallet' page with no useful content.","The broad catalog of endpoints (AI, finance, data, utils) is advertised on the landing page but none have been individually verified beyond this one inbox endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/77","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/77","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/inbox/77 is undocumented. The crawled docs pages are effectively empty. This is a stub-level 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'/request':19,38,157 '0.02':18,37,79,156 '000':83 '20':82 '6':89 'Base network API' 'USDC pay-per-call' 'access':74,181 'account':95 'actual':225 'addit':209 'advertis':114 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':119 'api':5,24,45,73,92,180,198 'authent':99 'base':8,27,63,84 'behavior':226 'behind':171 'beyond':176 'broad':50 'call':4,23,81 'caller':98 'capabl':221 'catalog':51 'classif':131 'classification' 'commit':165 'connect':204 'convers':148 'cost':76 'crawl':193 'data':11,30,118 'data-analytics' 'decim':90 'detail':210 'doc':194 'document':175 'embed':132 'embeddings' 'enabl':44 'endpoint':16,35,57,67,116,152,231 'estim':142 'exampl':190 'exchang':137 'export':122 'expos':48 'famili':117 'feed':136 'financ':13,32,133 'finance-data' 'four':115 'function':170 'gas':141 'gateway':216 'generat':149 'generic':178 'geocod':146 'geocoding' 'header':110 'inbox':230 'infrastructur':144 'insight':123 'key':93 'label':182 'learn':126 'limit':162 'list':70,151,213 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':125 'metric':120 'micropayment API' 'minim':203 'minimum':164 'network':64 'no-api-key' 'note':166 'offer':10,29 'openapi':186 'page':195 'particular':229 'pay':2,21,54,101 'pay-as-you-go API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':109 'per':3,22,55,80 'platform':6,25,46,113,219 'premium':72,179 'price':135,158,196 'product':237 'prompt':206 'protocol':105 'quot':140 'rate':138,161 'readm':197 'reli':233 'report':121 'request':56 'request/response':189 'requir':97 'resolv':200 'schema':187 'sentiment':127 'sentiment-analysis' 'settl':58 'share':153 'specif':66,169 'summar':130 'text':129 'text-summarization' 'token':139 'treat':211 'unit':85 'usdc':9,28,60,87 'usdc-base' 'util':15,34,145 'utility-apis' 'valid':147 'verifi':223 'via':102 'wallet':205 'web3':134 'wider':112 'x':108 'x-payment':107 'x402':43,104 'x402 API marketplace' 'x402-enabled':42 'x402-payment'","prices":[{"id":"89ed77dd-bc21-40db-8f4f-bda74bbeb909","listingId":"06588cc4-fc2d-48d2-962e-4320ac30fbea","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.387Z"}],"sources":[{"listingId":"06588cc4-fc2d-48d2-962e-4320ac30fbea","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.387Z","lastSeenAt":"2026-04-22T04:02:45.785Z"}],"details":{"listingId":"06588cc4-fc2d-48d2-962e-4320ac30fbea","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/77 \\\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 endpoint returns a 402 challenge requesting USDC payment on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/inbox/77"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/77"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Calling AI inference endpoints (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-request basis","Exporting or querying analytics data and insights on demand"],"bestFor":["Agents and bots that need keyless, on-demand API access paid per call","Developers prototyping with low-cost, no-commitment endpoints","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads that need SLAs, rate guarantees, or dedicated support","Users who cannot transact in USDC on the Base network","Applications requiring detailed API documentation or guaranteed response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.442Z"},"updatedAt":"2026-04-22T04:02:45.785Z"}}