{"id":"80c2f9d4-35d6-4f24-abbc-e8138959bc38","shortId":"bj3Nau","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/73` is one of many endpoints offered by the provider, which hosts 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, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract 0x8335…2913 on Base) to address 0x1A2B…85F3. The maxAmountRequired of 20000 base units equals $0.02 (USDC uses 6 decimals). The timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example request/response payloads are available for this specific inbox endpoint, so its exact functionality beyond the generic \"Premium API Access\" label is unclear. The provider's landing page lists the broader API catalog but does not document request or response formats for any endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","premium-api"],"categories":["general","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC micropayment API","Base network API","premium API access"],"warnings":["No OpenAPI or schema documentation available for this endpoint or any endpoint on the provider's site","The exact functionality of /api/v1/inbox/73 ('Premium API Access') is not described anywhere — it could be a generic placeholder","Crawled /api, /pricing, and /README pages all returned only 'Connect wallet' with no useful content","No example requests or responses are available to verify what the endpoint actually does"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/73","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI schema, no documentation of request/response formats, and the specific purpose of /api/v1/inbox/73 is undocumented. The provider's landing page lists many endpoints but provides no technical details for any of them. Effectively a stub 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'/request':13,28 '0.02':12,27,95,146 '0x1a2b':137 '0x8335':131 '20000':142 '2913':132 '300':154 '6':149 '85f3':138 'Base network API' 'USDC micropayment API' 'accept':122 'access':7,22,38,181 'address':136 'ai':65 'analysi':69 'analyt':64 'api':6,21,37,107,180,193 'avail':166 'base':9,24,103,134,143 'beyond':176 'broad':60 'broader':192 'call':4,19 'catalog':61,194 'challeng':116 'classif':71 'commit':112 'confirm':117 'contract':130 'convers':88 'data':63 'decim':150 'detail':159 'document':160,198 'embed':72 'endpoint':32,52,91,119,171,205 'equal':145 'estim':82 'exact':174 'exampl':162 'exchang':77 'feed':76 'financ':73 'format':202 'function':175 'gas':81 'generat':89 'generic':178 'geocod':86 'host':58 'inbox':170 'infrastructur':84 'key':108 'label':182 'land':188 'learn':67 'limit':110 'list':190 'live':121 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'mani':51 'maxamountrequir':140 'network':104 'no-api-key' 'offer':53 'one':49 'openapi':157 'page':189 'path':46 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':98 'payload':164 'payment':42,127 'per':3,18,96 'post':123 'post-endpoint' 'premium':5,20,36,179 'premium API access' 'premium-api' 'price':75,93 'protocol':43 'provid':35,56,186 'quot':80 'rate':78,109 'request':97,124,199 'request/response':163 'requir':113 'respons':201 'schema':158 'second':155 'sentiment':68 'settl':126 'span':62 'specif':45,169 'summar':70 'timeout':152 'token':79 'unclear':184 'unit':144 'usdc':15,30,100,129,147 'usdc-base' 'use':148 'util':85 'valid':87 'via':10,25,39 'web3':74 'x402':11,26,41,115 'x402 API' 'x402-payment'","prices":[{"id":"1f5d0ecc-e679-4535-90a6-a54cb0117719","listingId":"80c2f9d4-35d6-4f24-abbc-e8138959bc38","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/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:22.168Z"}],"sources":[{"listingId":"80c2f9d4-35d6-4f24-abbc-e8138959bc38","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:22.168Z","lastSeenAt":"2026-04-22T04:02:35.003Z"}],"details":{"listingId":"80c2f9d4-35d6-4f24-abbc-e8138959bc38","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/73 \\\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, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 in USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/73"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Micropayment-gated access to premium data or services","Programmatic pay-per-use API consumption settled in USDC on Base"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access","Use cases requiring no rate limits and instant access"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods","High-volume batch workloads where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:07.805Z"},"updatedAt":"2026-04-22T04:02:35.003Z"}}