{"id":"290c68f4-8ea7-475d-88d1-13804cc9ca55","shortId":"twgK6c","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 variety of endpoints behind per-request USDC micropayments on the Base network. The platform advertises four 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). All endpoints are listed at $0.02 per request.\n\nThe specific endpoint at `/api/v1/inbox/146` is labeled \"Premium API Access\" and returns a live x402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no subscriptions required — callers simply attach an X-PAYMENT header with a valid payment proof. The endpoint accepts HTTP POST and returns application/json.\n\nNote that the specific functionality behind the `/api/v1/inbox/146` path is not documented on the site's landing page (it does not appear in the listed API catalog). The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional documentation. Without OpenAPI specs, request/response schemas, or usage examples, the actual behavior of this particular endpoint is unknown. Callers should treat this as an exploratory endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","http-post"],"categories":["api-marketplace","payments"],"synonyms":["x402 api","micropayment api","pay-per-request api","base usdc api","lowpaymentfee","low payment fee","402 payment api"],"warnings":["The /api/v1/inbox/146 endpoint is not listed in the site's public API catalog — its purpose is unclear.","No OpenAPI spec, request schema, or response schema is available.","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet').","Without documentation, the actual data or service returned by this endpoint cannot be verified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/146","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/146","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 spec, no request/response schema, no documentation beyond a landing page catalog, and the specific /inbox/146 path is not listed among the advertised APIs. The actual functionality is 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'/api/v1/inbox/146':113,190 '/pricing':213 '/readme':215 '/request':17,34 '0.02':16,33,106,140 '000':129 '0x8335':134 '20':128 '2913':135 '402 payment api' '6':138 'accept':177 'access':45,118 'actual':237 'addit':226 'advertis':63 'ai':10,27,75 'analysi':79 'analyt':69 'api':4,21,41,67,117,153,208 'appear':204 'application/json':182 'attach':164 'base':7,24,59,130,137 'base usdc api' 'base-network' 'behavior':238 'behind':51,188 'call':142 'caller':162,245 'catalog':209 'categori':65 'challeng':124 'classif':82 'connect':221 'convers':99 'crawl':211 'data':9,26,68,72 'decim':139 'document':194,227,255 'embed':83 'endpoint':14,31,50,102,111,176,242,252 'estim':93 'exact':149 'exampl':235 'exchang':88 'exploratori':251 'export':73 'feed':87 'financ':11,28,84 'four':64 'function':187 'gas':92 'gate':3,20,44 'generat':100 'geocod':97 'header':169 'http':178 'http-post' 'infrastructur':95 'insight':74 'json-response' 'key':154 'label':115 'land':199 'learn':77 'limit':157 'list':104,207 'live':122 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':76 'made':145 'marketplac':42 'metric':70 'micropay':56 'micropayment api' 'network':60 'no-api-key' 'note':183 'offer':8,25 'openapi':229 'page':200,216 'particular':241 'path':191 'pay-per-request api' 'payment':143,168,173 'per':53,107,141 'per-request':52 'per-request-billing' 'platform':5,22,62 'post':179 'premium':116 'price':86 'prompt':223 'proof':174 'protocol':40 'quot':91 'rate':89,156 'report':71 'request':54,108,125 'request/response':231 'requir':161 'return':120,181,218 'schema':232 'scheme':150 'sentiment':78 'simpli':163 'site':197 'spec':230 'specif':110,186 'subscript':160 'summar':81 'surfac':256 'text':80 'token':90 'treat':247 'unit':131 'unknown':244 'usag':234 'usdc':55,133 'usdc-micropayment' 'util':13,30,96 'valid':98,172 'varieti':48 'via':146 'wallet':222 'web3':85 'without':228 'x':167 'x-payment':166 'x402':2,19,39,123,148 'x402 api' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"e05cfc05-943f-4d2c-a6a3-da8832084cd0","listingId":"290c68f4-8ea7-475d-88d1-13804cc9ca55","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.538Z"}],"sources":[{"listingId":"290c68f4-8ea7-475d-88d1-13804cc9ca55","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.538Z","lastSeenAt":"2026-04-22T01:02:15.060Z"}],"details":{"listingId":"290c68f4-8ea7-475d-88d1-13804cc9ca55","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/146 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site lists 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, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/inbox/146 requests up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/inbox/146"}],"useCases":["Paying per-request for API access without subscriptions or API keys","Programmatic agent-driven API consumption with on-chain micropayments","Accessing data, AI inference, finance, or utility endpoints via x402 protocol"],"bestFor":["Agents or developers wanting zero-commitment, pay-as-you-go API access","x402-compatible wallets and clients on the Base network","Low-cost micropayment experimentation at $0.02 per call"],"notFor":["Users needing detailed API documentation or OpenAPI schemas before integrating","High-throughput production workloads where per-request crypto payments add latency","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.871Z"},"updatedAt":"2026-04-22T01:02:15.060Z"}}