{"id":"3cafadd6-7e92-46c9-b1e9-734ac988aea3","shortId":"GvTKhF","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/58` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, no subscriptions, no rate limits. Callers attach an `X-PAYMENT` header with a signed payment to access the resource.\n\nThe wider platform advertises four endpoint categories: 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.\n\nHowever, the specific functionality behind `/api/v1/inbox/58` is not documented — the description is simply \"Premium API Access\" with no schema, input/output examples, or further documentation available. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional content. Without knowing what this particular inbox endpoint does, callers should treat it as an opaque paid endpoint until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["The specific functionality of /api/v1/inbox/58 is completely undocumented — 'Premium API Access' is the only description provided.","No input or output schema is available; callers cannot know what request body to send or what response to expect.","The /api, /pricing, and /README pages returned no useful content beyond a wallet-connect prompt.","The platform lists many endpoint categories (AI, finance, data, utils) but none of those paths correspond to this specific inbox endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/58","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what /api/v1/inbox/58 actually does, no input/output schema, no examples, and the site's docs pages are empty. The listing is effectively a 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'/api/v1/inbox/58':68,175 '/pricing':198 '/readme':200 '/request':19,38,168 '0.02':18,37,79,167 '000':83 '20':82 '6':89 'access':74,118,185 'addit':211 'advertis':124 'ai':12,31,135 'analysi':139 'analyt':129 'api':5,24,45,73,99,184 'attach':107 'avail':194 'base':8,27,63,84 'base network api' 'base-network' 'behind':174 'broad':50 'call':4,23,81 'caller':106,221 'catalog':51 'categori':127 'classif':142 'connect':206 'content':212 'convers':159 'cost':76 'cover':10,29 'crawl':196 'data':11,30,128,132 'decim':90 'descript':180 'document':178,193,232 'embed':143 'enabl':44 'endpoint':16,35,57,67,126,163,219,229 'estim':153 'exampl':190 'exchang':148 'export':133 'feed':147 'financ':13,32,144 'four':125 'function':173 'gas':152 'generat':160 'geocod':157 'handl':93 'header':112 'howev':170 'inbox':218 'infrastructur':155 'input/output':189 'insight':134 'json-response' 'key':100 'know':214 'learn':137 'limit':105 'list':70,162 'low payment fee' 'lowpaymentfee.com':39 'machin':136 'metric':130 'micropayment api' 'network':64 'no-api-key' 'offer':48 'opaqu':227 'page':201 'paid':228 'particular':217 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':91,111,116 'per':3,22,55,80 'platform':6,25,46,123 'post-method' 'premium':72,183 'premium api access' 'price':146,169 'prompt':208 'protocol':97 'quot':151 'rate':104,149 'report':131 'request':56 'resourc':120 'return':203 'schema':188 'sentiment':138 'settl':58 'share':164 'sign':115 'simpli':182 'specif':66,172 'subscript':102 'summar':141 'surfac':233 'text':140 'token':150 'treat':223 'unit':85 'usdc':9,28,60,87 'usdc api' 'usdc-settlement' 'util':15,34,156 'valid':158 'via':94 'wallet':207 'web3':145 'wider':122 'without':213 'x':110 'x-payment':109 'x402':43,96 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"723718c8-2d2a-4b06-b386-71a8aad4236e","listingId":"3cafadd6-7e92-46c9-b1e9-734ac988aea3","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.704Z"}],"sources":[{"listingId":"3cafadd6-7e92-46c9-b1e9-734ac988aea3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.704Z","lastSeenAt":"2026-04-22T04:02:46.132Z"}],"details":{"listingId":"3cafadd6-7e92-46c9-b1e9-734ac988aea3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/58 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/58"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without needing API keys or subscriptions","Agent-driven workflows that settle per-call costs in USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402 protocol integrators looking for live endpoints to test against","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling an endpoint","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.997Z"},"updatedAt":"2026-04-22T04:02:46.132Z"}}