{"id":"ef125b47-107b-41a4-9abc-5613e2ad92a9","shortId":"Qmn9xQ","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 a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/inbox/114` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment header. The site advertises four broad categories of APIs: 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).\n\nPricing across the platform is uniform at $0.02 per request (20,000 base units of USDC with 6 decimals = $0.02), settled in USDC on the Base L2 network. The platform advertises no API keys, no rate limits, no minimums, and instant access — callers simply attach an x402 payment header to each request. The x402 challenge captured from the probed endpoint confirms the endpoint is live, using the \"exact\" payment scheme with a maxAmountRequired of 20,000 base units (~$0.02) and a 300-second payment timeout.\n\nNote that the specific functionality behind `/api/v1/inbox/114` is not documented on the site's landing page, which lists other named endpoints but not this one. Without further documentation or an OpenAPI spec, the exact input/output schema for this endpoint is unknown. The broader platform pages (pricing, README, API docs) returned only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","post-endpoint","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","crypto"],"synonyms":["lowpaymentfee","low payment fee API","x402 micropayment API","pay-per-request API","USDC API","Base network API","micropayment endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific path /api/v1/inbox/114 is not listed among the site's advertised APIs — its exact functionality is unknown","Site documentation pages (/api, /pricing, /README) returned no useful content beyond a wallet-connect prompt","No example request or response bodies are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/114","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no documentation for this specific endpoint (/api/v1/inbox/114), no input/output schema, and no example responses. The broader site docs pages returned only wallet-connect prompts. The listing is effectively a stub with confirmed 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'/request':17,34 '0.02':16,33,127,139,198 '000':131,195 '20':130,194 '300':201 '6':137 'Base network API' 'USDC API' 'accept':71 'access':69,161 'across':121 'addit':262 'advertis':81,150 'ai':10,27,94 'ai-inference' 'analysi':98 'analyt':88 'api':4,21,41,68,86,152,252 'attach':164 'base':7,24,57,132,145,196 'base-network' 'behind':49,210 'broad':83 'broader':247 'caller':162 'captur':175 'categori':84 'challeng':174 'classif':101 'collect':46 'confirm':180 'connect':257 'content':263 'convers':118 'data':9,26,87,91 'data-analytics' 'decim':138 'doc':253 'document':214,232 'embed':102 'endpoint':14,31,48,61,179,182,225,243 'estim':112 'exact':187,238 'exchang':107 'export':92 'feed':106 'financ':11,28,103 'finance-data' 'four':82 'function':209 'gas':111 'gate':3,20,44 'generat':119 'geocod':116 'header':78,168 'infrastructur':114 'input/output':239 'insight':93 'instant':160 'key':153 'l2':146 'land':219 'learn':96 'limit':156 'list':65,222 'live':184 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':95 'marketplac':42 'maxamountrequir':192 'metric':89 'micropay':54 'micropayment endpoint' 'minimum':158 'name':224 'network':58,147 'no-api-key' 'note':205 'offer':8,25 'one':229 'openapi':235 'page':220,249 'pay-per-request API' 'payment':77,167,188,203 'per':51,128 'per-request':50 'per-request-billing' 'platform':5,22,123,149,248 'post':72 'post-endpoint' 'premium':67 'price':105,120,250 'probe':178 'prompt':259 'protocol':40 'quot':110 'rate':108,155 'readm':251 'report':90 'request':52,73,129,171 'return':254 'schema':240 'scheme':189 'second':202 'sentiment':97 'settl':140 'simpli':163 'site':80,217 'spec':236 'specif':60,208 'summar':100 'text':99 'timeout':204 'token':109 'uniform':125 'unit':133,197 'unknown':245 'usdc':53,135,142 'usdc-micropayment' 'use':185 'util':13,30,115 'utility-services' 'valid':117 'wallet':258 'web3':104 'without':230 'x402':2,19,39,76,166,173 'x402 micropayment API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"2edb7cd3-4ca8-4d98-be88-f547ceb776e7","listingId":"ef125b47-107b-41a4-9abc-5613e2ad92a9","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.428Z"}],"sources":[{"listingId":"ef125b47-107b-41a4-9abc-5613e2ad92a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/114","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.428Z","lastSeenAt":"2026-04-22T01:02:14.920Z"}],"details":{"listingId":"ef125b47-107b-41a4-9abc-5613e2ad92a9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/114 \\\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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, no minimums, on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/114 shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/inbox/114"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic access to data, AI, or finance endpoints with per-call crypto payment","Testing x402 protocol integrations with a low-cost live endpoint","Accessing utility services (geocoding, validation, conversion) via micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402 protocol experimentation at very low cost ($0.02/call)","Crypto-native applications already operating on Base with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume use cases where per-request payment overhead is impractical","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.079Z"},"updatedAt":"2026-04-22T01:02:14.920Z"}}