{"id":"0003ddcf-eabb-4c4c-a538-2c0d6305e74e","shortId":"54qerv","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated product inventory endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 54) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-call API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/products/54/inventory` is listed as \"Premium API Access\" and accepts HTTP POST requests. Payment is handled inline via the x402 protocol: callers attach an `X-PAYMENT` header containing a signed USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals). The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` on Base mainnet, using the USDC contract at `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. No API keys or accounts are required; access is granted purely through payment.\n\nDocumentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the inventory data actually contains. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 API","USDC pay-per-call","Base network API","lowpaymentfee","inventory lookup","crypto-paid API"],"warnings":["No API documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request body or response format","The endpoint name 'Premium API Access' is generic and does not describe what inventory data is returned","No request or response examples available anywhere in crawled content","Cannot verify what data the endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/54/inventory","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/products/54/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The purpose of this specific endpoint ('Premium API Access' for product 54 inventory) is vague and 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'0.02':10,24,78,132 '000':128 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':153 '20':127 '402':219 '54':42 '6':136 'Base network API' 'USDC pay-per-call' 'accept':100 'access':34,98,161 'account':158 'actual':209 'address':143 'ai/ml':68 'analyt':67 'api':63,97,155,177 'attach':113 'base':8,22,87,129,146 'base-network' 'beyond':168 'broader':53 'call':62 'caller':112 'challeng':220 'confirm':214 'connect':186 'contain':119,210 'content':192 'contract':151 'crypto':71 'crypto-paid API' 'data':66,208 'decim':137 'descript':203 'difficult':228 'doc':176 'document':167,225 'dozen':57 'endpoint':6,20,30,64,91,212 'exampl':200 'expect':239 'extrem':173 'financ':70 'gate':3,17 'grant':163 'handl':106 'header':118 'http':101 'i.e':131 'id':41 'infer':69 'inlin':107 'inventori':5,19,38,207 'inventory lookup' 'key':156 'know':230 'lack':223 'land':170 'list':94 'live':215 'lowpaymentfee' 'lowpaymentfee.com':32 'mainnet':147 'make':226 'network':88 'no-api-key' 'offer':56 'openapi':196 'page':171,181 'part':50 'pay':9,23,60 'pay-per-cal':59 'pay-per-request' 'payload':232 'payment':46,104,117,123,139,166 'per':11,25,61,79 'platform':54 'post':102 'premium':96 'price':76,178 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':188 'proper':218 'protocol':47,111 'provid':33 'pure':164 'readm':180 'render':183 'request':12,26,80,103 'request/response':199 'requir':160 'resourc':39 'respons':237 'return':216 'schema':197 'send':234 'sent':141 'servic':74 'settl':82 'sign':121 'sinc':133 'span':65 'spars':174 'specif':90 'substant':191 'unit':130 'usdc':14,28,84,122,134,150 'usdc-settlement' 'use':135,148 'util':73 'via':43,108 'wallet':187 'x':116 'x-payment':115 'x402':2,16,45,110 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"1dfa39da-6f56-460f-be1e-eaf269fbbe11","listingId":"0003ddcf-eabb-4c4c-a538-2c0d6305e74e","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/products/54/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:26.138Z"}],"sources":[{"listingId":"0003ddcf-eabb-4c4c-a538-2c0d6305e74e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/54/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:26.138Z","lastSeenAt":"2026-04-22T21:30:18.257Z"}],"details":{"listingId":"0003ddcf-eabb-4c4c-a538-2c0d6305e74e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/54/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/54/inventory"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/54/inventory"}],"useCases":["Querying product inventory data for product ID 54 via a single paid API call","Integrating pay-per-request inventory checks into automated agent workflows","Demonstrating x402 protocol payment flows on Base mainnet"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need on-demand inventory data without managing API keys","Use cases requiring micro-payment-gated data access on Base"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume inventory queries where per-request pricing may not be cost-effective","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:22:14.392Z"},"updatedAt":"2026-04-22T21:30:18.257Z"}}