{"id":"882b10da-a97e-474f-99fa-bfcd0064cd69","shortId":"32FF9n","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/policies/73` 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, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 functionality behind the `/api/v1/policies/73` endpoint is not documented beyond its \"Premium API Access\" label, so the exact data or service it returns is unclear.\n\nThe endpoint is live and returns a proper 402 challenge with x402 version 1. It accepts POST requests and returns `application/json`. Payment is settled in USDC (contract `0x8335...2913`) on Base to address `0x1A2B...85F3` with a 300-second timeout. Documentation pages beyond the landing page appear to require wallet connection and provide no additional content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api access","base network api","premium api"],"warnings":["The specific functionality of /api/v1/policies/73 ('Premium API Access') is not documented — it is unclear what data or service it returns.","All documentation pages (/docs, /api, /pricing, /README) appear to require wallet connection and contain no readable content.","No OpenAPI spec or request/response schema is available.","No example responses are available to verify what the endpoint actually returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/73","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/policies/73","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 actual functionality behind /api/v1/policies/73 is undocumented. No OpenAPI spec, no request/response schema, and all docs pages beyond the landing page are empty (wallet-gated). The listing is essentially a stub with pricing info 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'/call':13,28 '0.02':12,27,67,148 '000':71 '0x1a2b':211 '0x8335':205 '1':191 '20':70 '2913':206 '300':215 '402':186 '6':77 '85f3':212 'accept':46,193 'access':62,166 'addit':232 'address':210 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,61,80,107,165 'appear':224 'application/json':198 'attach':90 'base':8,23,51,72,208 'base network api' 'behind':155 'beyond':162,220 'broader':103 'caller':88 'categori':108 'challeng':187 'classif':124 'connect':228 'content':233 'contract':204 'convers':141 'cost':64 'data':110,114,171 'decim':78 'document':161,218 'embed':125 'endpoint':55,144,158,179 'estim':135 'exact':170 'exchang':130 'export':115 'feed':129 'financ':126 'function':154 'gas':134 'generat':142 'geocod':139 'header':95 'howev':151 'includ':109 'infrastructur':137 'insight':116 'json-api' 'key':81 'label':167 'land':222 'learn':119 'limit':83 'list':58,146 'live':181 'low payment fee' 'lowpaymentfee.com':31 'machin':118 'metric':112 'micropayment api' 'multipl':106 'network':9,24,52 'no-api-key' 'page':219,223 'pay':2,17,35 'pay per call api' 'pay-per-request':1,16,34 'payment':48,94,100,199 'per':3,18,36,68,149 'platform':6,21,39,104 'post':194 'post-method' 'premium':60,164 'premium api' 'price':128 'proof':101 'proper':185 'protocol':44 'provid':230 'quot':133 'rate':82,131 'report':113 'request':4,19,37,69,150,195 'requir':87,226 'return':175,183,197 'second':216 'sentiment':120 'servic':173 'settl':201 'simpli':89 'specif':54,153 'subscript':85 'summar':123 'text':122 'timeout':217 'token':132 'unclear':177 'unit':73 'usdc':15,30,47,75,203 'usdc api access' 'usdc-base-network' 'use':41 'util':138 'valid':98,140 'version':190 'via':10,25 'wallet':227 'web3':127 'x':93 'x-payment':92 'x402':11,26,43,99,189 'x402 api' 'x402-payment'","prices":[{"id":"e276c0aa-8bda-4cd3-bccb-980605a6d9df","listingId":"882b10da-a97e-474f-99fa-bfcd0064cd69","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/policies/73","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:08.030Z"}],"sources":[{"listingId":"882b10da-a97e-474f-99fa-bfcd0064cd69","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/73","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:08.030Z","lastSeenAt":"2026-04-23T06:31:18.753Z"}],"details":{"listingId":"882b10da-a97e-474f-99fa-bfcd0064cd69","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/73 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/73"},{"claim":"All 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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/73"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various data and utility endpoints"],"bestFor":["Developers wanting zero-commitment, per-call API pricing","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users needing detailed documentation or OpenAPI specs before integrating","Anyone without USDC on Base or an x402-compatible payment client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.124Z"},"updatedAt":"2026-04-23T06:31:18.753Z"}}