{"id":"2ecadd70-55c9-47e7-9f20-238baac1e703","shortId":"wwhJfK","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 provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/18` 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 valid payment proof and receive the response immediately.\n\nThe broader 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\nThe specific functionality behind `/api/v1/inbox/18` is not documented beyond the label \"Premium API Access.\" The endpoint accepts POST requests and returns `application/json`. No request body schema, response schema, or usage examples are provided by the site. The crawled /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No documentation available for /api/v1/inbox/18 — the purpose of 'Premium API Access' is unspecified beyond the label","No request or response schema provided; callers cannot know what to send or what to expect","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","The broader site lists many endpoint categories but it is unclear whether /inbox/18 maps to any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation for the specific /inbox/18 endpoint — no request schema, no response schema, no examples. The /api, /pricing, and /README pages are all gated behind a wallet connection and yield no useful content. The actual functionality of this endpoint is 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'/api/v1/inbox/18':68,176 '/pricing':211 '/readme':213 '/request':19,38,170 '0.02':18,37,79,169 '000':83 '20':82 '6':89 'Base network API' 'USDC API' 'accept':188 'access':74,185 'addit':224 'advertis':126 'ai':12,31,137 'analysi':141 'analyt':131 'api':5,24,45,73,99,184 'application/json':193 'attach':107 'base':8,27,63,84 'base-network' 'behind':175 'beyond':180 'bodi':196 'broad':50 'broader':124 'call':4,23,81 'caller':106 'catalog':51 'categori':129 'classif':144 'connect':219 'convers':161 'cost':76 'crawl':209 'data':11,30,130,134 'decim':90 'document':179,225 'embed':145 'enabl':44 'endpoint':16,35,57,67,128,165,187 'estim':155 'exampl':202 'exchang':150 'export':135 'feed':149 'financ':13,32,146 'four':127 'function':174 'gas':154 'generat':162 'geocod':159 'handl':93 'header':112 'immedi':122 'infrastructur':157 'insight':136 'json-api' 'key':100 'label':182 'learn':139 'limit':105 'list':70,164 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':138 'metric':132 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'page':214 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':91,111,116 'per':3,22,55,80 'platform':6,25,46,125 'post':189 'post-method' 'premium':72,183 'premium API access' 'price':148,171 'prompt':221 'proof':117 'protocol':97 'provid':48,204 'quot':153 'rate':104,151 'receiv':119 'report':133 'request':56,190,195 'respons':121,198 'return':192,216 'schema':197,199 'sentiment':140 'settl':58 'share':166 'site':207 'specif':66,173 'subscript':102 'summar':143 'text':142 'token':152 'unit':85 'usag':201 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,158 'valid':115,160 'via':94 'wallet':220 'web3':147 'x':110 'x-payment':109 'x402':43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"54f7eb82-606d-4ed1-9f6a-e9def6bd8cff","listingId":"2ecadd70-55c9-47e7-9f20-238baac1e703","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.644Z"}],"sources":[{"listingId":"2ecadd70-55c9-47e7-9f20-238baac1e703","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.644Z","lastSeenAt":"2026-04-22T04:02:46.067Z"}],"details":{"listingId":"2ecadd70-55c9-47e7-9f20-238baac1e703","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/18 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/18","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-proof>","Content-Type":"application/json"}},"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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/18"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/18"},{"claim":"The 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":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without subscription or API key management","Agent-driven workflows that need instant, per-call payment settlement","Programmatic access to a variety of data, AI, finance, and utility services via a single payment protocol"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible clients on the Base network","Low-volume or bursty workloads where per-request pricing is preferable to subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.098Z"},"updatedAt":"2026-04-22T04:02:46.067Z"}}