{"id":"f0bed5d1-57dc-43ff-8dec-47fe0275651d","shortId":"9kDGEr","kind":"x402","title":"x402-gated API inbox endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated API inbox endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at `/api/v1/inbox/166` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, settled in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific `/api/v1/inbox/166` path is labeled \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. The response MIME type is `application/json`. No request body schema or response schema is provided, so the precise input/output contract is unknown.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, this specific inbox endpoint does not map to any of those documented categories, and no further documentation was found for it.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","json-response","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["pay-per-request API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API","402 payment required","premium API access"],"warnings":["No documentation exists for the /api/v1/inbox/166 endpoint — its purpose and expected request/response format are unknown.","The endpoint path does not appear in the platform's own listed API catalog, raising questions about its intended use.","No OpenAPI spec, no request body schema, and no response examples are available.","The /pricing and /README pages returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/166","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/166","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 documentation for what /api/v1/inbox/166 actually does — no request schema, no response schema, no examples. The 'Premium API Access' label is generic and uninformative. The broader site lists many endpoints but none matching this 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'0.02':10,24,71,136,187 '000':125 '0x8335':130 '20':124 '2913':131 '402 payment required' '6':134 'Base network API' 'USDC micropayment API' 'accept':116 'access':98 'advertis':164 'ai':55 'analysi':168 'analyt':54 'api':4,18,51,83,97 'application/json':144 'base':8,22,79,126,133 'base-network' 'beyond':106 'bodi':147 'broader':162 'call':138 'categori':203 'challeng':111 'classif':171 'collect':42 'commit':88 'confirm':112 'contract':158 'convers':179 'data':53,181 'decim':135 'document':105,202,207 'embed':172 'endpoint':6,20,30,64,165,194 'exact':101 'exchang':175 'export':182 'feed':174 'financ':58 'found':209 'function':102 'gate':3,17 'geocod':177 'howev':190 'inbox':5,19,193 'infrastructur':61 'input/output':157 'json-response' 'key':84 'label':95,108 'learn':57 'limit':86 'live':115 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':56 'map':197 'mime':141 'network':80 'offer':40 'part':34 'path':93 'pay':9,23,48 'pay-per-request':47 'pay-per-request API' 'payment':122 'per':11,25,49,72,137 'per-request-billing' 'platform':38,67,163 'point':189 'post':117 'post-method' 'precis':156 'premium':96 'premium API access' 'price':69,173,188 'protocol':46 'provid':153 'rate':85,176 'request':12,26,50,73,118,146 'requir':89,120 'respons':140,150 'schema':148,151 'sentiment':167 'settl':74 'span':52 'specif':91,192 'summar':170 'text':169 'type':142 'unit':127 'unknown':160 'usdc':14,28,76,129 'usdc-settlement' 'util':62 'valid':178 'web3':59 'x402':2,16,45,110 'x402 endpoint' 'x402-gated':1,15 'x402-payment' 'x402-protocol':44","prices":[{"id":"3edcefa5-7724-4d4f-9462-dc3ed47ec159","listingId":"f0bed5d1-57dc-43ff-8dec-47fe0275651d","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.719Z"}],"sources":[{"listingId":"f0bed5d1-57dc-43ff-8dec-47fe0275651d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.719Z","lastSeenAt":"2026-04-22T01:02:15.257Z"}],"details":{"listingId":"f0bed5d1-57dc-43ff-8dec-47fe0275651d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/166 \\\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 platform advertises $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/inbox/166"},{"claim":"The platform lists endpoints for analytics, AI/ML, finance/Web3, and infrastructure utilities.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a gated API resource with per-call USDC micropayments on Base","Integrating pay-as-you-go API calls into an agent workflow without API keys","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 pay-per-request protocols","Agents that need keyless, on-demand API access settled in USDC","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate agreements","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.611Z"},"updatedAt":"2026-04-22T01:02:15.257Z"}}