{"id":"e784320e-4c09-479b-a87e-6906109633ff","shortId":"9Aq8Mk","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/inbox/196` is one of many endpoints offered by the platform, which advertises a broad catalog spanning data & analytics, AI & machine learning (sentiment analysis, 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, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain via the \"exact\" scheme to a specified wallet address, using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base. The maxAmountRequired of 20000 base units equals $0.02 (USDC has 6 decimals). The timeout is 300 seconds.\n\nHowever, the specific functionality behind `/api/v1/inbox/196` is not documented — the description simply says \"Premium API Access\" with no further detail on what input it expects or what output it returns. The platform's landing page lists many other endpoints but does not mention an \"inbox\" route. There is no OpenAPI spec, no request/response examples, and the pricing, README, and API doc pages all resolve to a minimal \"Connect wallet\" prompt with no additional information.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access"],"warnings":["The specific endpoint /api/v1/inbox/196 is not documented anywhere on the site — its purpose, expected input, and output are unknown.","No OpenAPI spec, request/response schema, or usage examples are available.","The /pricing, /README, and /api pages all resolve to a minimal 'Connect wallet' page with no content.","The 'inbox' path does not appear in the site's listed API catalog, raising questions about what this endpoint actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/196","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/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint /api/v1/inbox/196 has no documentation, no schema, no examples, and its purpose is entirely unknown. The broader site lists many endpoints but provides no technical docs beyond a landing page. This is effectively a stub 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'/request':13,28 '0.02':12,27,95,156 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':146 '20000':152 '300':164 '6':159 'Base network API' 'USDC micropayment API' 'accept':125 'access':7,22,38,181 'addit':238 'address':142 'advertis':58 'ai':65 'analysi':69 'analyt':64 'api':6,21,37,107,180,225 'base':9,24,103,148,153 'behind':170 'broad':60 'call':4,19 'catalog':61 'chain':133 'challeng':118 'classif':71 'commit':114 'confirm':119 'connect':233 'contract':145 'convers':88 'data':63 'decim':160 'descript':176 'detail':185 'doc':226 'document':174 'embed':72 'endpoint':32,52,91,121,204 'equal':155 'estim':82 'exact':136 'exampl':219 'exchang':77 'expect':190 'feed':76 'financ':73 'function':169 'gas':81 'generat':89 'geocod':86 'howev':166 'inbox':210 'inform':239 'infrastructur':84 'input':188 'key':108 'land':199 'learn':67 'limit':111 'list':201 'live':123 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'mani':51,202 'maxamountrequir':150 'mention':208 'minim':232 'network':104 'no-api-key' 'offer':53 'on-chain':131 'one':49 'openapi':215 'output':193 'page':200,227 'paid':98 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,128 'per':3,18,96 'platform':56,197 'post':126 'post-endpoint' 'premium':5,20,36,179 'premium API access' 'price':75,93,222 'prompt':235 'protocol':43 'provid':35 'quot':80 'rate':78,110 'readm':223 'request':97,127 'request/response':218 'requir':115 'resolv':229 'return':195 'rout':211 'say':178 'scheme':137 'second':165 'sentiment':68 'settl':130 'simpli':177 'span':62 'spec':216 'specif':45,168 'specifi':140 'summar':70 'timeout':162 'token':79 'unit':154 'usdc':15,30,100,144,157 'usdc-base' 'use':143 'util':85 'valid':87 'via':10,25,39,134 'wallet':141,234 'web3':74 'x402':11,26,41,117 'x402 API' 'x402-payment'","prices":[{"id":"88ed6538-890a-47e2-b4d5-59fa510ef649","listingId":"e784320e-4c09-479b-a87e-6906109633ff","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/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.769Z"}],"sources":[{"listingId":"e784320e-4c09-479b-a87e-6906109633ff","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/196","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.769Z","lastSeenAt":"2026-04-22T04:02:46.194Z"}],"details":{"listingId":"e784320e-4c09-479b-a87e-6906109633ff","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/196 \\\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 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":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/inbox/196"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/196"}],"useCases":["Paying per request for API access without needing API keys or subscriptions","Programmatic agent-driven API consumption settled in USDC on Base","Accessing a broad catalog of data, AI, finance, and utility endpoints via micropayments"],"bestFor":["Agents or developers wanting zero-commitment, pay-as-you-go API access","Crypto-native workflows that can settle USDC payments on Base","Exploring a multi-category API marketplace at very low per-call cost"],"notFor":["Users who need detailed API documentation and guaranteed SLAs before integrating","Use cases requiring non-crypto payment methods","Production workloads that depend on well-documented request/response schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.93Z"},"updatedAt":"2026-04-22T04:02:46.194Z"}}