{"id":"78b0e5fd-b818-4517-afcc-b8192fdd5abc","shortId":"qHa3BQ","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a collection of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/inbox/175` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys or rate limits are advertised; callers pay per request via the x402 payment header.\n\nThe broader platform advertises four categories of endpoints: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint `/api/v1/inbox/175` does not clearly map to any of these named categories — it may be a generic or custom inbox endpoint.\n\nDocumentation is extremely sparse. The crawled pages beyond the landing page (including /api, /pricing, and /README) returned only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available. The endpoint is confirmed live via a valid 402 challenge, but without documentation it is unclear what payload the POST endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","per-request-micropayment","usdc-settlement","base-network","post-endpoint","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-request API","USDC API","Base network API","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The path /api/v1/inbox/175 does not correspond to any of the named endpoints on the landing page — its actual function is unknown","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/175","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/175","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific /api/v1/inbox/175 path has no description of its purpose or expected input. This is effectively a stub 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'/api/v1/inbox/175':67,164 '/pricing':197 '/readme':199 '/request':17,34,158 '0.02':16,33,85,157 '000':79 '20':78 '402':233 '6':91 'Base network API' 'USDC API' 'access':45,73 'addit':208 'advertis':100,113 'ai':10,27,125 'analysi':129 'analyt':119 'api':4,21,41,72,94 'avail':224 'base':7,24,61,80 'base-network' 'behind':51 'beyond':191 'broader':111 'caller':101 'categori':115,174 'challeng':234 'charg':75 'classif':132 'clear':167 'collect':48 'confirm':228 'connect':203 'convers':149 'crawl':189 'custom':181 'data':9,26,118,122 'decim':92 'detail':210 'document':184,219,237 'embed':133 'endpoint':14,31,50,65,117,153,163,183,226,245 'estim':143 'exampl':223 'exchang':138 'expect':246 'export':123 'extrem':186 'feed':137 'financ':11,28,134 'four':114 'gas':142 'gate':3,20,44 'generat':150 'generic':179 'geocod':147 'header':109 'howev':160 'i.e':84 'inbox':182 'includ':195 'infrastructur':145 'insight':124 'json-response' 'key':95 'land':193 'learn':127 'limit':98 'list':69,152 'live':229 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':126 'map':168 'marketplac':42 'may':176 'metric':120 'micropay':55 'micropayment API' 'name':173 'network':62 'offer':8,25 'openapi':214 'page':190,194 'pay':102 'pay-per-request API' 'payload':242 'payment':108 'per':53,86,103 'per-request':52 'per-request-micropayment' 'platform':5,22,112 'post':244 'post-endpoint' 'premium':71 'price':136,159 'prompt':205 'protocol':40 'quot':141 'rate':97,139 'report':121 'request':54,87,104 'request/response':217 'return':200,250 'schema':218 'sentiment':128 'settl':56 'share':154 'sinc':88 'spars':187 'spec':215 'specif':64,162 'summar':131 'technic':209 'text':130 'token':140 'unclear':240 'unit':81 'usag':222 'usdc':58,83,89 'usdc-settlement' 'use':90 'util':13,30,146 'valid':148,232 'via':105,230 'wallet':204 'web3':135 'without':236 'x402':2,19,39,107 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d95e461b-61ad-4c7b-a92e-7d97268ff024","listingId":"78b0e5fd-b818-4517-afcc-b8192fdd5abc","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/175","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.726Z"}],"sources":[{"listingId":"78b0e5fd-b818-4517-afcc-b8192fdd5abc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/175","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.726Z","lastSeenAt":"2026-04-22T04:02:46.162Z"}],"details":{"listingId":"78b0e5fd-b818-4517-afcc-b8192fdd5abc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/175 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/175"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/175"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating micropayment-gated endpoints into agent workflows on Base","Accessing data, AI inference, finance, or utility services via x402 protocol"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments in USDC on Base","Projects needing low-cost per-call API access without rate limits"],"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 models","Users without USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.987Z"},"updatedAt":"2026-04-22T04:02:46.162Z"}}