{"id":"48f55eea-5a92-4816-85fb-7132aade1300","shortId":"HsnyKx","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/31` is listed as \"Premium API Access\" and returns JSON via POST. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits 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 the same $0.02/request price point. However, the specific endpoint being listed here (`/api/v1/policies/31`) is labeled only as \"Premium API Access\" and does not appear in the site's public API directory, so its exact functionality is unclear.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/policies/31` endpoint actually returns. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to know what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["The exact functionality of /api/v1/policies/31 is undocumented — it does not appear in the site's public API listing","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","No OpenAPI schema or request/response examples are available","No information on what input the POST body should contain or what the response looks like"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/31","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/31","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, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/policies/31 is unknown. The docs pages are empty beyond a wallet-connect 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'/api/v1/policies/31':56,176 '/call':13,28 '/docs':206 '/policies/31':237 '/pricing':208 '/readme':210 '/request':166 '0.02':12,27,88,165 '000':77 '0x8335':82 '20':76 '2913':83 '402':246 '402 payment API' '6':93 'Base network API' 'USDC API' 'accept':46 'access':62,183 'actual':239 'advertis':120 'ai':132 'analysi':136 'analyt':126 'api':5,20,38,61,96,122,182,193 'appear':187 'attach':105 'base':8,23,51,78,85 'broader':118 'caller':103 'captur':248 'categori':123 'challeng':70,247 'classif':139 'confirm':244 'connect':216 'content':222 'convers':156 'cost':74 'data':125,129,260 'decim':94 'descript':233 'difficult':256 'directori':194 'document':201,253 'embed':140 'endpoint':55,159,172,238,242 'equal':87 'estim':150 'exact':197 'exampl':230 'exchang':145 'export':130 'extrem':203 'feed':144 'financ':141 'function':198 'gas':149 'generat':157 'geocod':154 'header':110 'howev':169 'includ':124 'indic':71 'infrastructur':152 'insight':131 'json':65 'json-api' 'key':97 'know':258 'label':178 'lack':251 'learn':134 'limit':100 'list':58,161,174 'live':245 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':133 'make':254 'maximum':73 'metric':127 'micropayment API' 'multipl':121 'network':9,24,52 'no-api-key' 'openapi':226 'page':211 'pay':2,17,35 'pay per call API' 'pay-per-request':1,16,34 'payment':48,109,115 'per':3,18,36,89 'platform':6,21,39,119 'point':168 'post':67 'post-method' 'premium':60,181 'price':143,167 'prompt':218 'proof':116 'protocol':44 'provid':264 'public':192 'quot':148 'rate':99,146 'render':213 'report':128 'request':4,19,37,90 'request/response':229 'requir':102 'return':64,240 'schema':227 'sentiment':135 'servic':262 'simpli':104 'site':190 'spars':204 'specif':54,171 'substant':221 'summar':138 'text':137 'token':147 'unclear':200 'unit':79 'usdc':15,30,47,81,91 'usdc-base' 'use':41,92 'util':153 'valid':113,155 'via':10,25,66 'wallet':217 'web3':142 'x':108 'x-payment':107 'x402':11,26,43,69,114 'x402 API' 'x402-payment'","prices":[{"id":"e6df4271-d3c4-4d7c-93ad-90928f1d4318","listingId":"48f55eea-5a92-4816-85fb-7132aade1300","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:48.093Z"}],"sources":[{"listingId":"48f55eea-5a92-4816-85fb-7132aade1300","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:48.093Z","lastSeenAt":"2026-04-23T23:02:49.805Z"}],"details":{"listingId":"48f55eea-5a92-4816-85fb-7132aade1300","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/31 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/31"},{"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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without API key management","Pay-as-you-go API access with no subscription commitment"],"bestFor":["Developers wanting zero-commitment pay-per-call API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base network"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Anyone without USDC on the Base network","High-volume consumers who need bulk pricing or rate guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:03.066Z"},"updatedAt":"2026-04-23T23:02:49.805Z"}}