{"id":"40c5b567-fb76-4867-bab0-9626d214e56a","shortId":"wWXVBM","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/82` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. 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 priced at $0.02 per request and settle in USDC on Base.\n\nHowever, the specific functionality behind `/api/v1/policies/82` (\"Premium API Access\") is not documented beyond its title. The crawled docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or example payloads. Without further documentation it is unclear what data or service this particular endpoint returns when a valid payment is provided.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — all doc/pricing/README pages return only 'Connect wallet' with no content","The specific functionality of /api/v1/policies/82 ('Premium API Access') is completely undocumented","No request or response schema is provided; callers cannot know what to send or expect back","outputSchema only specifies HTTP POST method with no body or response details"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/82","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/82","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/call. However, there is no documentation for what /api/v1/policies/82 actually returns, no request/response schemas, and all doc pages render only a wallet-connect prompt. The listing is effectively a 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'/call':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC API' 'accept':46 'access':62,166 'addit':189 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,82,108,165 'attach':91 'base':8,23,51,73,157 'behind':162 'beyond':170 'broader':104 'call':80 'caller':89 'categori':109 'challeng':67 'classif':125 'connect':184 'convers':142 'crawl':174 'data':111,115,203 'doc':175 'document':169,191,198 'embed':126 'endpoint':55,145,208 'estim':136 'exampl':194 'exchang':131 'export':116 'feed':130 'financ':127 'function':161 'gas':135 'generat':143 'geocod':140 'header':96 'howev':158 'i.e':77 'includ':110 'infrastructur':138 'insight':117 'json-response' 'key':83 'learn':120 'limit':86 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'multipl':107 'network':9,24,52 'no-api-key' 'page':179 'particular':207 'pay':2,17,35 'pay per call API' 'pay-per-request':1,16,34 'payload':195 'payment':48,95,101,213 'per':3,18,36,79,150 'platform':6,21,39,105 'post-method' 'premium':60,164 'price':129,147,176 'prompt':186 'proof':102 'protocol':44 'provid':215 'quot':134 'rate':85,132 'readm':178 'report':114 'request':4,19,37,68,151 'requir':88 'return':64,181,209 'schema':192 'sentiment':121 'servic':205 'settl':153 'simpli':90 'specif':54,160 'summar':124 'technic':190 'text':123 'titl':172 'token':133 'unclear':201 'unit':74 'usdc':15,30,47,76,155 'usdc-base' 'use':41 'util':139 'valid':99,141,212 'via':10,25 'wallet':185 'web3':128 'without':196 'x':94 'x-payment':93 'x402':11,26,43,100 'x402 API' 'x402-payment'","prices":[{"id":"26dfa11f-68f0-4d16-9f1b-61c9df0c1a8f","listingId":"40c5b567-fb76-4867-bab0-9626d214e56a","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/82","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":"40c5b567-fb76-4867-bab0-9626d214e56a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/82","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:08.030Z","lastSeenAt":"2026-04-23T06:31:18.774Z"}],"details":{"listingId":"40c5b567-fb76-4867-bab0-9626d214e56a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/82 \\\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":"Endpoint returns 402 with x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/82"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/policies/82"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without needing API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need instant, keyless API access with crypto payment"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users comfortable paying in USDC on the Base L2 network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Developers who require fiat-only payment methods","High-volume consumers who need bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.124Z"},"updatedAt":"2026-04-23T06:31:18.774Z"}}