{"id":"987b75ec-4b2e-49aa-9d09-6a161c984fd4","shortId":"ntuGKA","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides a pay-per-request API service settled via the x402 protocol on the Base network using USDC. The specific endpoint `/api/v1/inbox/170` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 per request, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.\n\nThe broader lowpaymentfee.com platform advertises a suite of endpoints across four 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 endpoints are listed at $0.02 per request. However, the specific `/api/v1/inbox/170` endpoint does not clearly map to any of these named services — its purpose beyond \"Premium API Access\" is not documented.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The maximum timeout is 300 seconds. No OpenAPI schema, detailed documentation, or example responses are available for this specific endpoint.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","post-api","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay per call API","micropayment API","USDC API access","Base network API","lowpaymentfee","premium API"],"warnings":["The specific purpose of /api/v1/inbox/170 ('Premium API Access') is not documented — it does not match any of the named endpoints on the site.","No OpenAPI schema, request/response examples, or detailed documentation available for this endpoint.","The /api, /pricing, and /README pages all returned only a 'Connect wallet' prompt with no useful content.","Cannot verify what data or service this endpoint actually returns without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/170","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/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific functionality of /api/v1/inbox/170 is undocumented. No OpenAPI schema, no example responses, and no detailed docs are available. The broader site lists many endpoints but provides no specifics on request/response formats. This is effectively a stub 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'/call':13,28 '0.02':12,27,74,153 '000':68 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':202 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':206 '20':67 '300':211 '402':191 '6':80 'Base network API' 'USDC API access' 'access':7,22,62,176 'across':112 'address':201 'advertis':107 'ai':122 'analysi':126 'analyt':116 'api':6,21,41,61,83,175 'attach':94 'avail':222 'base':9,24,50,69,197 'base-network' 'beyond':173 'broader':104 'caller':92 'categori':114 'challeng':189 'charg':64 'classif':129 'clear':163 'commit':89 'contract':205 'convers':146 'data':115,119 'decim':81 'detail':216 'document':179,217 'embed':130 'endpoint':32,56,111,149,160,181,226 'estim':140 'exact':194 'exampl':219 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'gas':139 'generat':147 'geocod':144 'header':98 'howev':156 'http':190 'i.e':73 'infrastructur':142 'insight':121 'key':84 'label':59 'learn':124 'limit':86 'list':151 'live':183 'lowpaymentfee' 'lowpaymentfee.com':34,105 'machin':123 'map':164 'maximum':208 'metric':117 'micropayment API' 'name':169 'network':51,198 'no-api-key' 'no-rate-limit' 'openapi':214 'pay':2,17,38,199 'pay per call API' 'pay-per-request':1,16,37 'payment':97 'per':3,18,39,75,154 'platform':106 'post':101 'post-api' 'premium':5,20,60,174 'premium API' 'price':133 'protocol':47 'provid':35 'purpos':172 'quot':138 'rate':85,136 'report':118 'request':4,19,40,76,102,155 'requir':91 'respons':220 'return':185 'schema':215 'scheme':193 'second':212 'sentiment':125 'servic':42,170 'settl':43 'simpli':93 'sinc':77 'specif':55,158,225 'suit':109 'summar':128 'text':127 'timeout':209 'token':137 'unit':70 'upfront':88 'usdc':15,30,53,72,78,204 'usdc-settlement' 'use':52,79,203 'util':143 'valid':145,187 'via':10,25,44 'web3':132 'x402':11,26,46,96,188 'x402 API' 'x402-payment'","prices":[{"id":"b45c6f48-59af-43ac-be02-58e177c01eb8","listingId":"987b75ec-4b2e-49aa-9d09-6a161c984fd4","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/170","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.666Z"}],"sources":[{"listingId":"987b75ec-4b2e-49aa-9d09-6a161c984fd4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/170","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.666Z","lastSeenAt":"2026-04-22T01:02:15.209Z"}],"details":{"listingId":"987b75ec-4b2e-49aa-9d09-6a161c984fd4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/170 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/inbox/170","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/170"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/inbox/170"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Programmatic access to data, AI, finance, or utility endpoints without subscriptions"],"bestFor":["Developers or agents who want zero-commitment, pay-as-you-go API access","x402-compatible clients on the Base network","Use cases requiring low-cost ($0.02) per-request billing without API key management"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Callers not equipped with x402 payment capabilities or USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.619Z"},"updatedAt":"2026-04-22T01:02:15.209Z"}}