{"id":"747152f9-1165-48da-8aef-f08b3d4faf61","shortId":"AAj9Wk","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The provider operates a suite of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific resource at `/api/v1/generate/resource/156` is listed as \"Premium API Access\" with a max amount of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). The endpoint accepts HTTP POST and returns `application/json`. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`), with a maximum timeout of 300 seconds.\n\nNote that the exact functionality behind this particular resource path (`/resource/156`) is not documented. The provider's landing page lists categories like analytics, AI, finance, and utilities, but this specific numbered resource is not described among them. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional documentation. Treat this endpoint with caution: while it is live and responds with a valid x402 challenge, the actual payload it returns after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","http-post"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The exact functionality of /api/v1/generate/resource/156 is undocumented — the provider's site does not list this path among its advertised APIs.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content.","No OpenAPI schema, request/response examples, or error documentation available.","The resource path pattern (/resource/156) suggests a generic or auto-generated endpoint; its purpose is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/156","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/generate/resource/156","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, but the specific resource (/resource/156) has no documentation explaining what it does or what it returns. The docs, pricing, and API pages are empty beyond a wallet-connect prompt. Without an OpenAPI schema, example responses, or any description of the resource's purpose, this is effectively a stub 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'/request':13,28 '/resource/156':167 '0.02':12,27,69,122 '000':117 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':142 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':149 '20':116 '300':155 '6':127 'Base network API' 'USDC micropayment API' 'accept':131 'access':7,22,38,110 'actual':228 'addit':209 'address':141 'ai':180 'ai/ml':58 'among':192 'amount':114 'analyt':57,179 'api':6,21,37,54,81,109,198 'application/json':136 'attach':92 'base':9,24,78,118,148 'behind':162 'call':4,19 'caller':90 'categori':177 'caution':215 'challeng':226 'commit':87 'connect':204 'contract':146 'crypto-paid API' 'data':56,62 'decim':128 'describ':191 'doc':195 'document':170,210 'endpoint':32,130,213 'exact':160 'financ':60,181 'function':161 'header':96 'http':132 'http-post' 'infer':59 'infrastructur':64 'json-response' 'key':82 'land':174 'like':178 'limit':84 'list':106,176 'live':219 'lowpaymentfee' 'lowpaymentfee.com':34 'made':139 'max':113 'maximum':152 'network':79 'no-api-key' 'note':157 'number':187 'oper':46 'page':175,199 'particular':164 'path':166 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'payload':229 'payment':42,95,137,233 'per':3,18,52,70 'post':133 'premium':5,20,36,108 'premium API access' 'price':67,196 'prompt':206 'protocol':43 'provid':35,45,172 'rate':83 'render':201 'request':53,71,99 'requir':89 'resourc':102,165,188 'respond':221 'return':135,231 'second':156 'settl':73 'simpli':91 'sinc':124 'span':55 'specif':101,186 'suit':48 'timeout':153 'treat':211 'unit':119 'unknown':235 'upfront':86 'usd':123 'usdc':15,30,75,121,125,145 'usdc-base' 'use':126,143 'util':65,183 'valid':224 'via':10,25,39 'wallet':205 'web3':61 'x402':11,26,41,94,225 'x402 API' 'x402-payment'","prices":[{"id":"5e766133-5391-47c4-a6a0-e03bb865c47b","listingId":"747152f9-1165-48da-8aef-f08b3d4faf61","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/generate/resource/156","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:55.348Z"}],"sources":[{"listingId":"747152f9-1165-48da-8aef-f08b3d4faf61","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/156","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:55.348Z","lastSeenAt":"2026-04-22T23:00:59.700Z"}],"details":{"listingId":"747152f9-1165-48da-8aef-f08b3d4faf61","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/156 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/156"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/156"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agent-driven API consumption where per-call USDC payment replaces API key management","Programmatic access to premium resources without subscription commitments","Integrating pay-as-you-go endpoints into Web3-native workflows"],"bestFor":["Developers or agents wanting zero-signup, pay-per-request API access","Web3-native applications that can settle USDC on Base","Low-volume or bursty workloads where flat per-call pricing is economical"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","High-volume consumers who would benefit from bulk/subscription pricing","Anyone unable to transact USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.341Z"},"updatedAt":"2026-04-22T23:00:59.700Z"}}