{"id":"3a188ce9-49b2-4336-bdb4-dcde3a9121af","shortId":"THv9Uf","kind":"x402","title":"x402-gated product inventory endpoint on Base, pay-per-request with USDC.","tagline":"x402-gated product inventory endpoint on Base, pay-per-request with USDC.","description":"This endpoint at lowpaymentfee.com provides access to a product inventory resource (product ID 88) via the x402 payment protocol. It is part of a broader platform offering dozens of pay-per-call APIs 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/88/inventory` is labeled \"Premium API Access\" by the provider. The x402 challenge confirms it is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0.02 USD) per call. Payment is settled on-chain on Base to the specified wallet address. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned 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's purpose (product inventory lookup) is inferred solely from the URL path and the generic \"Premium API Access\" label. Prospective callers should be aware that without documentation, the request body format and response schema are unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","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 return only a wallet-connect prompt with no content.","No OpenAPI or output schema provided; request body format and response structure are completely unknown.","The endpoint's purpose ('Premium API Access' for product 88 inventory) is inferred only from the URL path; actual functionality is unverified.","The broader platform lists many endpoints but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/88/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/88/inventory","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 via a valid 402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the endpoint actually returns. The listing is effectively a 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'0.02':118 '000':113 '20':112 '402 payment API' '88':42 'Base network API' 'USDC pay-per-call' 'accept':103 'access':34,92,146,221 'actual':200 'address':134 'advertis':137 'ai/ml':66 'analyt':65 'api':62,91,139,168,220 'attach':149 'awar':227 'base':8,22,80,114,129 'base-network' 'behind':75 'bodi':233 'broader':53 'call':61,121 'caller':147,224 'chain':127 'challeng':98 'confirm':99 'connect':177 'content':183 'crawl':166 'crypto':69 'data':64 'descript':194 'doc':167 'document':161,230 'dozen':56 'endpoint':6,20,30,86,199,203 'exampl':191 'extrem':163 'financ':68 'format':234 'gate':3,17,74 'generic':218 'header':154 'id':41 'infer':67,210 'instant':145 'inventori':5,19,38,198,207 'key':140 'label':89,222 'limit':143 'live':102 'lookup':208 'lowpaymentfee' 'lowpaymentfee.com':32 'maximum':109 'micropay':77 'micropayment API' 'network':81 'no-api-key' 'offer':55 'on-chain':125 'openapi':187 'page':172 'part':50 'path':215 'pay':10,24,59 'pay-per-cal':58 'pay-per-request':9,23 'payment':46,110,122,153,159 'per':11,25,60,120 'platform':54,136 'post':104 'premium':90,219 'price':169 'product':4,18,37,40,206 'product inventory API' 'product-inventory' 'prompt':179 'proof':160 'prospect':223 'protocol':47 'provid':33,95 'purpos':205 'rate':142 'readm':171 'request':12,26,105,232 'request/response':190 'requir':107 'resourc':39 'respons':236 'return':174,201 'schema':188,237 'servic':72 'settl':124 'simpli':148 'sole':211 'span':63 'spars':164 'specif':85 'specifi':132 'substant':182 'unit':115 'unknown':239 'url':214 'usd':119 'usdc':14,28,83,117 'usdc-micropayment' 'use':82 'util':71 'valid':157 'via':43 'wallet':133,178 'without':229 'x':152 'x-payment':151 'x402':2,16,45,76,97,158 'x402 inventory endpoint' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"ef08d3e7-bea3-4dff-a227-778ba749c113","listingId":"3a188ce9-49b2-4336-bdb4-dcde3a9121af","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/88/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":"2026-04-18T18:32:29.143Z"}],"sources":[{"listingId":"3a188ce9-49b2-4336-bdb4-dcde3a9121af","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/88/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:29.143Z","lastSeenAt":"2026-04-22T21:30:18.408Z"}],"details":{"listingId":"3a188ce9-49b2-4336-bdb4-dcde3a9121af","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/88/inventory \\\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 x402Version 1, requiring USDC payment on Base network with maxAmountRequired of 20000 base units (0.02 USD).","source_url":"https://lowpaymentfee.com/api/v1/products/88/inventory"},{"claim":"The platform 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/products/88/inventory"}],"useCases":["Querying product inventory data for product ID 88 via a single paid API call","Integrating pay-per-request inventory checks into an agent workflow without API key management","Demonstrating x402 micropayment protocol usage on Base"],"bestFor":["Agents or developers experimenting with x402 payment-gated APIs","Use cases requiring keyless, pay-as-you-go API access on Base","Low-volume inventory lookups where $0.02/call is acceptable"],"notFor":["Production inventory management requiring documented schemas and SLAs","High-volume inventory queries where per-call costs would accumulate significantly","Users who need detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:23:08.051Z"},"updatedAt":"2026-04-22T21:30:18.408Z"}}