{"id":"70c01011-8858-4853-8c5d-8ed51b07f8e4","shortId":"4ZqhVz","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 at `/api/v1/inbox/133` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate and pay via the x402 protocol's X-PAYMENT header.\n\nThe 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 the same $0.02 per request price point with no rate limits or minimum commitments.\n\nThe specific `/api/v1/inbox/133` endpoint does not clearly map to any of the named API categories on the landing page, and no documentation, request/response schemas, or usage examples are available beyond the x402 challenge. The endpoint accepts POST requests and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` in USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.","tags":[],"capabilities":["x402-payment","usdc-base","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":["The endpoint path /api/v1/inbox/133 does not correspond to any documented API on the landing page — its actual functionality is unknown.","No request body schema or response schema is documented; callers must guess what to send.","Documentation pages (/api, /pricing, /README) returned no useful content beyond 'Connect wallet'.","The platform lists many endpoint categories but provides no detailed docs for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/133","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/133","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the specific endpoint '/api/v1/inbox/133' has no documentation, no request/response schema, and its purpose ('Premium API Access') is vague and doesn't match any named API on the landing page. No OpenAPI spec, no examples, and crawled docs pages returned only 'Connect wallet' with no 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'/request':19,38 '0.02':18,37,80,159 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':216 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':219 '20':83 '6':90 'Base network API' 'USDC API' 'accept':206 'access':75 'account':96 'advertis':114 'ai':12,31,126 'analysi':130 'analyt':120 'api':5,24,45,74,93,118,184 'application/json':211 'authent':100 'avail':199 'base':8,27,63,85,221 'beyond':200 'broad':50 'call':4,23 'caller':99 'catalog':51 'categori':116,185 'challeng':203 'classif':133 'clear':177 'commit':170 'convers':150 'cost':77 'data':11,30,119,123 'decim':91 'document':192 'embed':134 'enabl':44 'endpoint':16,35,57,67,153,174,205 'estim':144 'exampl':197 'exchang':139 'export':124 'feed':138 'financ':13,32,135 'four':115 'gas':143 'generat':151 'geocod':148 'header':111 'infrastructur':146 'insight':125 'json-api' 'key':94 'land':188 'learn':128 'limit':167 'list':71,155 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':127 'map':178 'metric':121 'micropayment API' 'minimum':169 'name':183 'network':64 'no-api-key' 'offer':10,29 'page':189 'pay':2,21,54,102 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':110,212 'per':3,22,55,81,160 'platform':6,25,46,113 'point':163 'post':207 'post-method' 'premium':73 'premium API access' 'price':137,162 'protocol':106 'provid':48 'quot':142 'rate':140,166 'report':122 'request':56,82,161,208 'request/response':193 'requir':98 'return':210 'schema':194 'sent':214 'sentiment':129 'settl':58 'specif':66,172 'summar':132 'text':131 'token':141 'unit':86 'usag':196 'usdc':9,28,60,88,218 'usdc-base' 'util':15,34,147 'valid':149 'via':103 'web3':136 'x':109 'x-payment':108 'x402':43,105,202 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2fc386f4-f583-4939-b161-7243f29f6951","listingId":"70c01011-8858-4853-8c5d-8ed51b07f8e4","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/133","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.456Z"}],"sources":[{"listingId":"70c01011-8858-4853-8c5d-8ed51b07f8e4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/133","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.456Z","lastSeenAt":"2026-04-22T15:02:58.183Z"}],"details":{"listingId":"70c01011-8858-4853-8c5d-8ed51b07f8e4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/133 \\\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 endpoint returns a 402 x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/133"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals, making 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/inbox/133"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to utility or data endpoints without needing API keys or subscriptions","Agent-driven workflows that need to pay per call with USDC on Base","Exploring x402 protocol integration for pay-as-you-go API consumption"],"bestFor":["Developers or agents wanting zero-signup, pay-per-request API access","x402-compatible clients on the Base network","Low-cost, low-friction API calls settled in USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.997Z"},"updatedAt":"2026-04-22T15:02:58.183Z"}}