{"id":"3b64e409-8ed7-4146-bf70-42d874df5dd1","shortId":"M2Xc8p","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/68` is listed as \"Premium API Access\" and returns a 402 challenge requiring up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform offers 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 priced at $0.02 per request and settle in USDC on Base.\n\nThe `/api/v1/policies/68` endpoint specifically is labeled \"Premium API Access\" but no further documentation describes what data or functionality it returns. The docs, pricing, and API pages on the site are gated behind a wallet-connect flow and yielded no additional content during crawl. Without schema details or example responses, the exact payload structure is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","finance"],"synonyms":["low payment fee","x402 api","micropayment api","usdc api","base network api","pay per call api","policies endpoint"],"warnings":["No documentation available — docs, pricing, and API pages all resolve to a wallet-connect prompt with no content","The exact functionality of /api/v1/policies/68 is undocumented; 'Premium API Access' is the only description","No OpenAPI spec or output schema provided beyond the basic x402 challenge metadata","No example request or response bodies are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/68","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/68","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 example request/response, and the docs pages are empty behind a wallet-connect gate. The purpose of the specific /policies/68 endpoint is entirely unclear beyond the generic label 'Premium API 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'/call':13,28 '0.02':12,27,78,154 '000':72 '20':71 '402':66 'accept':46 'access':62,92,171 'across':113 'addit':203 'advertis':83 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,61,85,170,187 'attach':95 'base':8,23,51,73,162 'base network api' 'behind':194 'broader':108 'call':80 'caller':93 'categori':115 'challeng':67 'classif':130 'connect':198 'content':204 'convers':147 'crawl':206 'data':116,120,178 'describ':176 'detail':209 'doc':184 'document':175 'embed':131 'endpoint':55,112,150,165 'estim':141 'exact':214 'exampl':211 'exchang':136 'export':121 'feed':135 'financ':132 'flow':199 'four':114 'function':180 'gas':140 'gate':193 'generat':148 'geocod':145 'header':100 'i.e':77 'infrastructur':143 'insight':122 'instant':91 'json-response' 'key':86 'label':168 'learn':125 'limit':89 'list':58 'low payment fee' 'lowpaymentfee.com':31,109 'machin':124 'metric':118 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':111 'page':188 'pay':2,17,35 'pay per call api' 'pay-per-request':1,16,34 'payload':215 'payment':48,99,105 'per':3,18,36,79,155 'platform':6,21,39,82,110 'policies endpoint' 'post-method' 'premium':60,169 'price':134,152,185 'proof':106 'protocol':44 'quot':139 'rate':88,137 'report':119 'request':4,19,37,156 'requir':68 'respons':212 'return':64,182 'schema':208 'sentiment':126 'settl':158 'simpli':94 'site':191 'specif':54,166 'structur':216 'summar':129 'text':128 'token':138 'unit':74 'unknown':218 'usdc':15,30,47,76,160 'usdc api' 'usdc-base' 'use':41 'util':144 'valid':103,146 'via':10,25 'wallet':197 'wallet-connect':196 'web3':133 'without':207 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment' 'yield':201","prices":[{"id":"ae3a8803-fb7f-45f8-b885-353dac1e1473","listingId":"3b64e409-8ed7-4146-bf70-42d874df5dd1","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/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:12.252Z"}],"sources":[{"listingId":"3b64e409-8ed7-4146-bf70-42d874df5dd1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:12.252Z","lastSeenAt":"2026-04-23T23:02:51.910Z"}],"details":{"listingId":"3b64e409-8ed7-4146-bf70-42d874df5dd1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/68 \\\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 requiring up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/68"},{"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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/68"},{"claim":"The site offers endpoints 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","Integrating pay-as-you-go API calls into autonomous agents without API key management","Programmatic access to policy data or premium content behind x402 paywall"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who want bulk pricing or subscription discounts","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:01.896Z"},"updatedAt":"2026-04-23T23:02:51.910Z"}}