{"id":"39a54292-75f1-46de-bd77-c519a20dc741","shortId":"D3Qvv4","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 set 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/93` is listed as \"Premium API Access\" and returns a valid x402 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). Payment is made via the `exact` scheme with a 300-second timeout. No API keys or rate limits are advertised; access is gated purely by per-request micropayment.\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 of this, the actual behavior and response format of each endpoint (including `/api/v1/inbox/93`) cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["ai","data","finance","infrastructure"],"synonyms":["micropayment API","pay-per-call API","x402 API","USDC API","Base network API","low fee API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific path /api/v1/inbox/93 is not listed among the named endpoints on the landing page — its purpose is unknown","No request body schema or response format documented anywhere","All sub-pages (/api, /pricing, /README) return only a 'Connect wallet' prompt with no content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/93","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/93","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no usage examples, and no documentation beyond a landing page listing endpoints. The purpose of '/api/v1/inbox/93' specifically is unclear — it is not listed among the named endpoints on the homepage. This is effectively a stub 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'/api/v1/inbox/93':112,226 '/pricing':198 '/readme':200 '/request':19,38 '0.02':18,37,95,141 '000':130 '0x8335':135 '20':129 '2913':136 '300':151 '402':124 '6':139 'Base network API' 'USDC API' 'access':118,162 'across':54 'actual':217 'addit':211 'advertis':161 'ai':12,31,64 'ai-inference' 'analysi':68 'analyt':58 'api':5,24,45,117,155 'avail':178,231 'base':8,27,103,131,138 'behavior':218 'broad':50 'call':4,23 'cannot':227 'categori':56 'challeng':125 'classif':71 'classification' 'confirm':229 'connect':206 'content':212 'convers':88 'conversion' 'crypto-paid API' 'data':11,30,57,61 'data-analytics' 'decim':140 'document':171,191 'embed':72 'embeddings' 'enabl':44 'endpoint':16,35,53,91,111,179,224 'estim':82 'exact':147 'exampl':195 'exchang':77 'exchange-rates' 'export':62 'expos':48 'feed':76 'financ':13,32,73 'finance-data' 'format':221 'four':55 'gas':81 'gas-estimates' 'gate':164 'generat':89 'geocod':86 'geocoding' 'includ':225 'infrastructur':84 'insight':63 'key':156 'land':175 'learn':66 'limit':159 'list':114,177 'low fee API' 'lowpaymentfee.com':39 'machin':65 'made':144 'materi':232 'metric':59 'micropay':170 'micropayment API' 'minim':173 'network':104 'offer':10,29 'openapi':186 'page':176,201 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'payment':142 'per':3,22,96,168 'per-request':167 'platform':6,25,46 'premium':116 'price':75,93,181 'prompt':208 'protocol':108 'pure':165 'quot':80 'rate':78,158 'report':60 'request':97,126,169 'request/response':189 'resolv':203 'respons':220 'return':120 'schema':190 'scheme':148 'second':152 'sentiment':67 'sentiment-analysis' 'set':51 'settl':98 'spec':187 'specif':110 'summar':70 'text':69 'text-summarization' 'timeout':153 'token':79 'unit':132 'usag':194 'usdc':9,28,100,134 'usdc-base' 'util':15,34,85 'valid':87,122 'validation' 'via':105,145 'wallet':207 'web3':74 'x402':43,107,123 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"1dd8dff4-3cd5-43e3-bc8b-292b70b3db0f","listingId":"39a54292-75f1-46de-bd77-c519a20dc741","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.252Z"}],"sources":[{"listingId":"39a54292-75f1-46de-bd77-c519a20dc741","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.252Z","lastSeenAt":"2026-04-22T04:02:45.645Z"}],"details":{"listingId":"39a54292-75f1-46de-bd77-c519a20dc741","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/93 \\\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 API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/93 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/93"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven data retrieval without API key management","On-demand AI inference (sentiment, summarization, classification, embeddings) paid per call","Fetching real-time crypto prices, gas estimates, or exchange rates via micropayment","Geocoding or data validation as a utility service with no subscription commitment"],"bestFor":["AI agents needing keyless, pay-per-use API access","Developers who want to avoid subscription overhead for occasional API calls","Web3-native applications that can settle USDC on Base"],"notFor":["High-volume batch processing where per-request costs add up quickly","Users who need detailed API documentation or guaranteed SLAs","Applications requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.644Z"},"updatedAt":"2026-04-22T04:02:45.645Z"}}