{"id":"bda41597-abb7-4131-aabc-35d1940101b0","shortId":"Kt7hX7","kind":"x402","title":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated premium API endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com is one of many x402-protocol-gated API endpoints offered by the provider. The specific resource `/api/v1/policies/84` is labeled \"Premium API Access\" and accepts POST requests, returning JSON responses. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 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 lowpaymentfee.com platform hosts a catalog of pay-per-call endpoints spanning 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 uniformly priced at $0.02 per request.\n\nHowever, the specific functionality behind `/api/v1/policies/84` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs, pricing, and API pages all returned only a \"Connect wallet\" prompt with no additional content. The endpoint is confirmed live (returns a proper 402 challenge), but what data or service it actually provides remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The specific functionality of /api/v1/policies/84 is completely undocumented — 'Premium API Access' is the only description available.","No OpenAPI schema, request format, or response examples are provided.","All documentation pages (docs, api, pricing, README) returned only a 'Connect wallet' prompt with no useful content.","The provider's broader catalog lists many endpoints but none match this specific /policies/84 path, making its purpose unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation of what the endpoint actually does, no request/response schema, no examples, and all doc pages returned only 'Connect wallet' with no content. The listing is effectively a 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'0.02':79,164 '000':83 '0x8335':73 '20':82 '2913':74 '402':218 '6':87 'Base network API' 'USDC micropayment API' 'accept':57 'access':55,181 'actual':226 'addit':208 'ai':132 'analysi':136 'analyt':126 'api':5,19,41,54,90,180,197 'attach':99 'base':8,22,68,84 'base-network' 'behind':171 'beyond':176 'broader':112 'call':12,26,122 'caller':97 'catalog':117 'challeng':219 'classif':139 'confirm':213 'connect':203 'content':209 'contract':72 'convers':156 'cost':77 'crawl':193 'crypto-paid endpoint' 'data':125,129,222 'decim':88 'doc':194 'document':175 'embed':140 'endpoint':6,20,30,42,123,159,211 'estim':150 'exampl':190 'exchang':145 'export':130 'feed':144 'financ':141 'function':170 'gas':149 'gate':3,17,40 'generat':157 'generic':178 'geocod':154 'header':104 'host':115 'howev':167 'infrastructur':152 'insight':131 'json':61 'json-response' 'key':91 'label':52,182 'learn':134 'limit':94 'live':214 'lowpaymentfee' 'lowpaymentfee.com':32,113 'machin':133 'mani':36 'metric':127 'network':69 'no-api-key' 'offer':43 'one':34 'openapi':186 'page':198 'pay':10,24,120 'pay-per-cal':9,23,119 'pay-per-call' 'pay-per-request API' 'payment':63,103,109 'per':11,25,80,121,165 'platform':114 'post':58 'post-method' 'premium':4,18,53,179 'premium API access' 'price':143,162,195 'prompt':205 'proof':110 'proper':217 'protocol':39 'provid':46,227 'quot':148 'rate':93,146 'remain':228 'report':128 'request':59,81,166 'request/response':189 'requir':96 'resourc':49 'respons':62 'return':60,200,215 'schema':187 'sentiment':135 'servic':224 'settl':65 'simpli':98 'span':124 'specif':48,169 'summar':138 'text':137 'token':147 'unclear':229 'uniform':161 'unit':85 'usdc':14,28,71 'usdc-settlement' 'use':70 'util':153 'valid':107,155 'wallet':204 'web3':142 'x':102 'x-payment':101 'x402':2,16,38,108 'x402 API' 'x402-gated':1,15 'x402-payment' 'x402-protocol-gated':37","prices":[{"id":"2a7188cc-e77a-46af-bd45-f7523d2a3675","listingId":"bda41597-abb7-4131-aabc-35d1940101b0","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:52:03.896Z"}],"sources":[{"listingId":"bda41597-abb7-4131-aabc-35d1940101b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:52:03.896Z","lastSeenAt":"2026-04-23T05:01:27.862Z"}],"details":{"listingId":"bda41597-abb7-4131-aabc-35d1940101b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/84 \\\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 requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/policies/84"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/policies/84"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/84"}],"useCases":["Programmatic access to a premium API resource with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Integrating x402-compatible payment flows into automated pipelines"],"bestFor":["Developers already using x402 payment protocol","Agents with Base-network USDC wallets seeking low-friction API access","Use cases requiring no-signup, no-rate-limit API consumption"],"notFor":["Users who need detailed documentation or known response schemas before integrating","Applications requiring free or fiat-settled API access","Production systems that need SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.32Z"},"updatedAt":"2026-04-23T05:01:27.862Z"}}