{"id":"dc4147a8-f4cd-403f-9cb1-578da9159eaf","shortId":"cXm3uZ","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 endpoints across four 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint `/api/v1/inbox/69` is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys or rate limits required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing, but there is no OpenAPI spec, no request/response schema documentation, and no usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because the specific purpose of the `/api/v1/inbox/69` endpoint is not described beyond \"Premium API Access,\" its exact functionality is unclear and must be discovered by making a paid request.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/inbox/69 ('Premium API Access') is not explained — its functionality is unknown","All sub-pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no useful content","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/69","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/69","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 it accepts USDC payments on Base at $0.02. However, there is no OpenAPI spec, no request/response schema, no usage examples, and the specific function of /api/v1/inbox/69 is undocumented beyond the generic label 'Premium API Access'. Most detail is inferred from the landing page 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'/api/v1/inbox/69':112,217 '/pricing':196 '/readme':198 '/request':19,38 '0.02':18,37,95,134 '000':129 '20':128 '402':123 '402 payment api' '6':139 'access':118,163,225 'across':54 'addit':209 'advertis':161 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,153,224 'avail':176 'base':8,27,103,130,142 'base network api' 'beyond':222 'broad':50 'call':4,23 'catalog':51 'categori':56 'challeng':124 'classif':71 'classification' 'commit':168 'connect':204 'content':210 'convers':88 'data':11,30,57,61 'data-analytics' 'decim':140 'describ':221 'discov':234 'document':169,189 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,177,218 'estim':82 'exact':149,227 'exampl':193 'exchang':77 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'four':55 'function':228 'gas':81 'generat':89 'geocod':86 'geocoding' 'infrastructur':84 'insight':63 'instant':162 'key':154 'land':173 'learn':66 'limit':157 'list':114,175 'low payment fee' 'lowpaymentfee.com':39 'machin':65 'made':145 'make':236 'metric':59 'micropayment api' 'minim':171 'minimum':166 'must':232 'network':104 'offer':10,29 'openapi':184 'page':174,199 'paid':238 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':143 'per':3,22,96 'platform':6,25,46,160 'premium':116,223 'price':75,93,179 'prompt':206 'protocol':108 'purpos':214 'quot':80 'rate':78,156 'report':60 'request':97,125,239 'request/response':187 'requir':158 'resolv':201 'return':120 'schema':188 'scheme':150 'sentiment':67 'sentiment-analysis' 'settl':98 'sinc':136 'spec':185 'specif':110,213 'summar':70 'text':69 'text-summarization' 'token':79 'unclear':230 'unit':131 'usag':192 'usd':135 'usdc':9,28,100,133,137 'usdc api' 'usdc-base' 'use':138 'util':15,34,85 'utility-apis' 'valid':87,122 'via':105,146 'wallet':205 'web3':74 'x402':43,107,148 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"3df48f54-5314-4200-a7c2-b83dccb3028c","listingId":"dc4147a8-f4cd-403f-9cb1-578da9159eaf","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.085Z"}],"sources":[{"listingId":"dc4147a8-f4cd-403f-9cb1-578da9159eaf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.085Z","lastSeenAt":"2026-04-22T10:32:51.985Z"}],"details":{"listingId":"dc4147a8-f4cd-403f-9cb1-578da9159eaf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/69 \\\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":"All endpoints are priced at $0.02 per request with no minimums or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is settled in USDC on the Base network via x402","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/69 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/69"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["AI agents that need on-demand access to diverse API services without subscriptions","Developers wanting zero-commitment, pay-as-you-go API access settled in crypto","Workflows requiring low-cost micropayments ($0.02/call) for mixed utility and AI endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up compared to subscription plans","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.886Z"},"updatedAt":"2026-04-22T10:32:51.985Z"}}