{"id":"a686fd53-8592-41eb-b4fe-76216ceeb351","shortId":"5gBZFf","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/policies/1` is described as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) at a maximum cost of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises 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 listed at the same $0.02/request price point.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/policies/1` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","premium API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose and output of /api/v1/policies/1 ('Premium API Access') is completely undocumented","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/policies/1","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/1","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 with clear pricing. However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. It is impossible to determine what the /api/v1/policies/1 endpoint actually returns, making this effectively a stub 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'/api/v1/policies/1':55,208 '/call':13,28 '/docs':176 '/pricing':177 '/readme':180 '/request':168 '0.02':12,27,87,167 '000':82 '0x8335':72 '20':81 '2913':73 '402':219 '6':92 'Base network API' 'USDC API access' 'accept':63 'access':7,22,61,233 'across':124 'actual':210 'advertis':122 'ai':134 'analysi':138 'analyt':128 'api':6,21,40,60,95,232 'attach':106 'base':9,24,49,75,83 'base-network' 'broader':119 'caller':104 'categori':126 'challeng':220 'classif':141 'commit':101 'connect':186 'contract':71 'convers':158 'cost':79 'data':127,131,228 'decim':93 'describ':57 'descript':204 'detail':193 'document':171,223 'embed':142 'endpoint':41,53,123,161,209,213 'equal':86 'estim':152 'exampl':201 'exchang':147 'export':132 'extrem':173 'feed':146 'financ':143 'four':125 'function':230 'gas':151 'gate':42 'generat':159 'geocod':156 'header':111 'infrastructur':154 'insight':133 'json-response' 'key':96 'learn':136 'limit':98 'list':163 'live':215 'lowpaymentfee' 'lowpaymentfee.com':31,120 'machin':135 'maximum':78 'metric':129 'micropayment API' 'network':50 'no-api-key' 'offer':32 'openapi':197 'page':181 'pay':2,17,37 'pay-per-call API' 'pay-per-request':1,16,36 'payment':66,110,116 'per':3,18,38,88 'platform':121 'point':170 'post':64 'post-endpoint' 'premium':5,20,59,231 'premium API' 'price':145,169 'prompt':188 'proof':117 'proper':218 'protocol':46 'provid':234 'quot':150 'rate':97,148 'render':183 'report':130 'request':4,19,39,65,89 'request/response':200 'requir':103 'return':211,216 'schema':198 'sentiment':137 'settl':68 'simpli':105 'spars':174 'specif':52 'suit':34 'summar':140 'technic':192 'text':139 'token':149 'unclear':226 'unit':84 'upfront':100 'usdc':15,30,70,90 'usdc-settlement' 'use':91 'util':155 'valid':114,157 'via':10,25 'wallet':187 'web3':144 'without':222 'x':109 'x-payment':108 'x402':11,26,45,115 'x402 API' 'x402-payment'","prices":[{"id":"189007f5-520c-4afc-9435-2028b9d49b43","listingId":"a686fd53-8592-41eb-b4fe-76216ceeb351","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/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:51:56.535Z"}],"sources":[{"listingId":"a686fd53-8592-41eb-b4fe-76216ceeb351","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/policies/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:51:56.535Z","lastSeenAt":"2026-04-23T08:01:37.480Z"}],"details":{"listingId":"a686fd53-8592-41eb-b4fe-76216ceeb351","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/policies/1 \\\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 a 402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/policies/1"},{"claim":"All endpoints priced at $0.02/request 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/1"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without signing up for an account or obtaining API keys","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integration","AI agents that need keyless, pay-per-request API access","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:02.7Z"},"updatedAt":"2026-04-23T08:01:37.480Z"}}