{"id":"a0f0676c-d546-4d03-9d7f-bc5dcdf3b5f8","shortId":"zL2KGz","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-call with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 91) via the x402 payment protocol. It is part of a broader platform that offers dozens of pay-per-request API endpoints spanning data analytics, AI/ML inference, finance, crypto, and utility services — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific endpoint `/api/v1/products/91/inventory` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain on Base using USDC (contract 0x8335…2913) with a maximum amount of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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 endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what input the POST body should contain or what shape the response takes.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","402 payment API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request body or response format","The specific purpose and data returned by /api/v1/products/91/inventory is unknown","Cannot verify what 'Premium API Access' actually provides beyond the endpoint being live"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/91/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/91/inventory","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 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' for product 91 inventory actually returns. The listing is effectively a 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'0.02':124 '000':119 '0x8335':111 '20':118 '2913':112 '402':201 '402 payment API' '6':129 '91':42 'Base network API' 'USDC pay-per-call' 'accept':97 'access':34,95,142 'actual':191 'advertis':133 'ai/ml':68 'amount':116 'analyt':67 'api':63,94,135,160 'attach':145 'base':8,22,82,107,120 'base-network' 'behind':77 'bodi':213 'broader':53 'call':12,26 'chain':105 'challeng':202 'confirm':196 'connect':168 'contain':215 'content':174 'contract':110 'crypto':71 'data':66 'decim':130 'descript':185 'doc':158 'document':153,205 'dozen':57 'endpoint':6,20,30,64,88,190,194 'equal':123 'exampl':182 'extrem':155 'financ':70 'gate':3,17,76 'header':149 'id':41 'infer':69 'input':210 'instant':141 'inventori':5,19,38,189 'key':136 'limit':139 'list':91 'live':197 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':115 'micropay':79 'micropayment API' 'network':83 'no-api-key' 'offer':56 'on-chain':103 'openapi':178 'page':163 'part':50 'pay':10,24,60 'pay-per-cal':9,23 'pay-per-request':59 'payment':46,100,148 'per':11,25,61,125 'platform':54,132 'post':98,212 'premium':93 'price':159 'product':4,18,37,40 'product inventory API' 'product-inventory' 'prompt':170 'proper':200 'protocol':47 'provid':33 'rate':138 'readm':162 'render':165 'request':62,99,126,152 'request/response':181 'resourc':39 'respons':220 'return':192,198 'schema':179 'servic':74 'settl':102 'shape':218 'simpli':144 'span':65 'spars':156 'specif':87 'substant':173 'take':221 'unclear':208 'unit':121 'usdc':14,28,85,109,127 'usdc-settlement' 'use':84,108,128 'util':73 'via':43 'wallet':169 'without':204 'x402':2,16,45,78,147 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"3c32c92b-d4b8-455e-beb7-324e4d66d70b","listingId":"a0f0676c-d546-4d03-9d7f-bc5dcdf3b5f8","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/91/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":"2026-04-18T18:35:06.058Z"}],"sources":[{"listingId":"a0f0676c-d546-4d03-9d7f-bc5dcdf3b5f8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/91/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:06.058Z","lastSeenAt":"2026-04-22T20:00:29.640Z"}],"details":{"listingId":"a0f0676c-d546-4d03-9d7f-bc5dcdf3b5f8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/91/inventory \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <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 valid x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/91/inventory"},{"claim":"The platform advertises $0.02 per request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/91/inventory"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Querying product inventory data with per-request USDC micropayments","Integrating inventory checks into agent workflows without API key management","Programmatic inventory lookups settled on Base L2"],"bestFor":["Developers or agents wanting keyless, pay-per-call inventory data","x402-compatible agent wallets on Base network","Low-friction API access without subscriptions or rate limits"],"notFor":["Users needing detailed API documentation or schema before integrating","High-volume use cases where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.702Z"},"updatedAt":"2026-04-22T20:00:29.640Z"}}