{"id":"92664eb2-88c7-4115-8e95-a12576c86079","shortId":"NQqxr3","kind":"x402","title":"x402-payable API endpoint on Base network — pay per request with USDC, no API keys required.","tagline":"x402-payable API endpoint on Base network — pay per request with USDC, no API keys required.","description":"This endpoint at `/api/v1/item/37` is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests, returning JSON responses. Payment is handled via the x402 protocol using USDC on the Base network.\n\nThe platform advertises a flat $0.02 per request pricing model across its endpoints, though the x402 challenge for this particular endpoint specifies a `maxAmountRequired` of 20000 (in USDC's 6-decimal representation, equaling $0.02). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof. The payment address is `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` and the timeout window is 300 seconds.\n\nDocumentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no description of what `/api/v1/item/37` actually returns or what input it expects. The endpoint is confirmed live (402 challenge captured), but its actual functionality cannot be determined from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","post-endpoint","json-response","no-api-key"],"categories":["api","x402"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC pay-per-call","Base network API","micropayment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages are all empty beyond a wallet connect prompt","The specific functionality of /api/v1/item/37 is entirely unknown; 'Premium API Access' is not descriptive","No request or response schema is documented or inferrable","No OpenAPI or ai-plugin manifest found","This endpoint's purpose cannot be verified — it may be a placeholder or test endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/37","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/item/37","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, but there is zero documentation on what the endpoint does, what inputs it accepts, or what it returns. The title 'Premium API Access' is completely generic. No OpenAPI spec, no examples, and all doc pages are empty wallet-connect 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'/api/v1/item/37':38,199 '/docs':168 '/pricing':170 '/readme':172 '0.02':100,128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':155 '20000':120 '300':161 '402':212 '6':124 'Base network API' 'USDC pay-per-call' 'accept':76 'access':74 'across':105 'actual':200,217 'address':153 'advertis':97 'ai/ml':61 'analyt':60 'api':4,15,21,32,57,73,130 'attach':139 'avail':223 'base':7,24,93 'caller':137 'cannot':219 'captur':214 'challeng':111,213 'collect':48 'confirm':210 'connect':178 'content':184 'data':59 'decim':125 'descript':196 'determin':221 'document':163,193 'endpoint':5,22,36,69,107,115,208 'equal':127 'expect':206 'extrem':165 'finance/web3':63 'flat':99 'function':218 'handl':84 'header':144 'infer':62 'infrastructur':65 'input':204 'json':80 'json-response' 'key':16,33,131 'label':71 'limit':134 'live':211 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':43 'materi':224 'maxamountrequir':118 'micropayment API' 'model':104 'network':8,25,94 'no-api-key' 'offer':46 'openapi':188 'page':173 'part':40 'particular':114 'pay':9,26,54 'pay-per-request':53 'payabl':3,20 'payment':82,143,149,152 'per':10,27,55,101 'platform':44,96 'post':77 'post-endpoint' 'premium':72 'price':103 'prompt':180 'proof':150 'protocol':52,88 'rate':133 'render':175 'represent':126 'request':11,28,56,78,102 'request/response':191 'requir':17,34,136 'respons':81 'return':79,201 'schema':192 'second':162 'simpli':138 'span':58 'spars':166 'spec':189 'specif':68 'specifi':116 'though':108 'timeout':158 'usdc':13,30,90,122 'usdc-base-network' 'use':89 'util':66 'valid':147 'via':85 'wallet':179 'window':159 'x':142 'x-payment':141 'x402':2,19,51,87,110,148 'x402 premium API' 'x402-payable':1,18 'x402-payment' 'x402-protocol':50","prices":[{"id":"cac38290-3c0f-48a3-bc80-6b76a8535ffd","listingId":"92664eb2-88c7-4115-8e95-a12576c86079","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/item/37","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:31:54.823Z"}],"sources":[{"listingId":"92664eb2-88c7-4115-8e95-a12576c86079","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/37","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:31:54.823Z","lastSeenAt":"2026-04-23T05:00:37.136Z"}],"details":{"listingId":"92664eb2-88c7-4115-8e95-a12576c86079","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/37 \\\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 with maxAmountRequired of 20000 USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/37"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a premium API resource via x402 micropayments","Agent-driven API consumption without pre-registration or API keys","Demonstrating x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 protocol integrations","Agents that need keyless, pay-per-call API access on Base","Testing USDC micropayment workflows"],"notFor":["Users who need documented request/response schemas before integrating","Production workloads requiring SLA guarantees or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T08:45:42.11Z"},"updatedAt":"2026-04-23T05:00:37.136Z"}}