{"id":"15ecd40c-935e-4f77-9948-eafcabbfa62f","shortId":"zDGZQy","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 catalog of endpoints across four categories: Data & Analytics (metrics, reports, 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/132` is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme with no API keys or rate limits required. The platform advertises instant access with no minimums or commitments.\n\nDocumentation is minimal — the landing page lists available endpoints and pricing but provides no request/response schemas, parameter descriptions, or usage examples. The `/api`, `/pricing`, and `/README` pages all resolve to a \"Connect wallet\" prompt with no additional content. Because this specific endpoint path (`/inbox/132`) does not match any of the named API categories on the homepage, its exact functionality is unclear; it may be a generic or custom inbox endpoint. Agents should treat the endpoint as live but should be aware that input/output schemas are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["The endpoint path /api/v1/inbox/132 does not match any named endpoint on the provider's homepage; its exact functionality is unknown.","No request or response schema is documented anywhere.","The /pricing, /api, and /README pages contain no useful content (only 'Connect wallet' prompts).","No rate limit, SLA, or uptime guarantees are documented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/132","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/132","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 402 challenge, confirming pricing and network. However, there is no OpenAPI schema, no request/response documentation, no examples, and the specific /inbox/132 path is not explained anywhere on the site. The crawled pages beyond the homepage are empty wallet-connect prompts. This is effectively a stub 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'/api/v1/inbox/132':111 '/inbox/132':211 '/pricing':191 '/readme':193 '/request':19,38 '0.02':18,37,94,133 '000':128 '20':127 '402':122 '6':138 'access':117,162 'across':54 'addit':204 'advertis':160 'agent':238 'ai':12,31,63 'ai-inference' 'analysi':67 'analyt':58 'api':5,24,45,116,152,219 'avail':175 'awar':248 'base':8,27,102,129,141 'base network api' 'broad':50 'call':4,23 'catalog':51 'categori':56,220 'challeng':123 'classif':70 'classification' 'commit':167 'connect':199 'content':205 'convers':87 'custom':235 'data':11,30,57 'data-analytics' 'decim':139 'descript':185 'document':168 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,53,90,110,176,209,237,242 'estim':81 'exact':148,225 'exampl':188 'exchang':76 'export':61 'expos':48 'feed':75 'financ':13,32,72 'finance-data' 'four':55 'function':226 'gas':80 'generat':88 'generic':233 'geocod':85 'geocoding' 'homepag':223 'inbox':236 'infrastructur':83 'input/output':250 'insight':62 'instant':161 'key':153 'land':172 'learn':65 'limit':156 'list':113,174 'live':244 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':64 'made':144 'match':214 'may':230 'metric':59 'micropayment api' 'minim':170 'minimum':165 'name':218 'network':103 'offer':10,29 'page':173,194 'paramet':184 'path':210 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':142 'per':3,22,95 'platform':6,25,46,159 'premium':115 'price':74,92,178 'prompt':201 'protocol':107 'provid':180 'quot':79 'rate':77,155 'report':60 'request':96,124 'request/response':182 'requir':157 'resolv':196 'return':119 'schema':183,251 'scheme':149 'sentiment':66 'sentiment-analysis' 'settl':97 'sinc':135 'specif':109,208 'summar':69 'text':68 'text-summarization' 'token':78 'treat':240 'unclear':228 'undocu':253 'unit':130 'usag':187 'usd':134 'usdc':9,28,99,132,136 'usdc api' 'usdc-base' 'use':137 'util':15,34,84 'utility-apis' 'valid':86,121 'via':104,145 'wallet':200 'web3':73 'x402':43,106,147 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"99e04900-0af2-4ea0-9e50-2f8ae09e4d17","listingId":"15ecd40c-935e-4f77-9948-eafcabbfa62f","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/132","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.537Z"}],"sources":[{"listingId":"15ecd40c-935e-4f77-9948-eafcabbfa62f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/132","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.537Z","lastSeenAt":"2026-04-22T02:31:59.417Z"}],"details":{"listingId":"15ecd40c-935e-4f77-9948-eafcabbfa62f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/132 \\\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 the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/132 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/inbox/132"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates via micropayment","Running geocoding, validation, or data conversion tasks with per-request billing"],"bestFor":["AI agents that need key-free, pay-as-you-go access to diverse utility endpoints","Developers prototyping with low-cost per-call pricing on Base/USDC","Web3-native applications that prefer on-chain settlement over subscription billing"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who need detailed API documentation, SLAs, or guaranteed uptime"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.871Z"},"updatedAt":"2026-04-22T02:31:59.417Z"}}