{"id":"e8a51498-28bd-4aa1-87fd-a5c13fe63ac7","shortId":"Kx8YwU","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 37) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) with a maximum cost of 0.02 USDC per request (20,000 base units at 6 decimals).\n\nThe hosting site lowpaymentfee.com offers a broad catalog of x402-gated APIs spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments. This specific endpoint falls under what appears to be a product/inventory domain, though the exact response schema and field definitions are not documented in the crawled material.\n\nThe endpoint is live and returns a valid x402 version-1 challenge when called without payment. No OpenAPI spec, detailed documentation, or example responses were found during the crawl — the docs, pricing, and README pages all rendered only a wallet-connect prompt with no substantive content. As a result, the actual data returned by this endpoint and its input parameters remain unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","product-inventory","json-response","pay-per-request","no-api-key"],"categories":["commerce","data"],"synonyms":["product inventory API","x402 inventory endpoint","USDC pay-per-call","Base network API","lowpaymentfee inventory","402 payment required API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available — input parameters and response format are unknown","Docs, pricing, and README pages render only a wallet-connect prompt with no substantive content","The purpose and contents of 'product 37 inventory' are not described anywhere in the crawled material","The site appears to host many endpoints but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/37/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/37/inventory","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no OpenAPI spec, no documentation beyond a wallet-connect stub, no example request/response, and no description of what the inventory data actually contains. The listing is essentially a stub with pricing and liveness 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'0.02':72,108 '000':77 '0x8335':65 '20':76 '2913':66 '37':42 '402 payment required API' '6':81 'Base network API' 'USDC pay-per-call' 'accept':49 'access':34 'actual':199 'ai/ml':99 'analyt':98 'api':95,113 'appear':127 'base':8,22,60,78 'base-network' 'broad':89 'call':161 'catalog':90 'challeng':159 'commit':120 'connect':189 'content':194 'contract':64 'cost':70 'crawl':146,176 'crypto-paid API' 'data':97,200 'decim':82 'definit':140 'detail':167 'doc':178 'document':143,168 'domain':132 'endpoint':6,20,30,123,149,204 'exact':135 'exampl':170 'fall':124 'field':139 'finance/web3':101 'found':173 'gate':3,17,94 'host':84 'id':41 'infer':100 'infrastructur':103 'input':207 'inventori':5,19,38 'json':54 'json-response' 'key':114 'limit':117 'live':151 'lowpaymentfee inventory' 'lowpaymentfee.com':32,86 'materi':147 'maximum':69 'network':61 'no-api-key' 'offer':87 'openapi':165 'page':182 'paramet':208 'pay':10,24 'pay-per-request':9,23 'payment':46,55,163 'per':11,25,74,109 'post':50 'price':106,179 'product':4,18,37,40 'product inventory API' 'product-inventory' 'product/inventory':131 'prompt':190 'protocol':47 'provid':33 'rate':116 'readm':181 'remain':209 'render':184 'request':12,26,51,75,110 'resourc':39 'respons':136,171 'result':197 'return':53,153,201 'schema':137 'settl':57 'site':85 'span':96 'spec':166 'specif':122 'substant':193 'though':133 'unclear':210 'unit':79 'usdc':14,28,63,73 'usdc-settlement' 'use':62 'util':104 'valid':155 'version':157 'via':43 'wallet':188 'wallet-connect':187 'without':162 'x402':2,16,45,93,156 'x402 inventory endpoint' 'x402-gated':1,15,92 'x402-payment'","prices":[{"id":"3e0193fc-5b28-4922-b813-179b856fbaa6","listingId":"e8a51498-28bd-4aa1-87fd-a5c13fe63ac7","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/37/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":"2026-04-18T18:36:33.723Z"}],"sources":[{"listingId":"e8a51498-28bd-4aa1-87fd-a5c13fe63ac7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/37/inventory","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:33.723Z","lastSeenAt":"2026-04-22T16:30:40.992Z"}],"details":{"listingId":"e8a51498-28bd-4aa1-87fd-a5c13fe63ac7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/37/inventory \\\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":"Endpoint returns a valid x402 version-1 challenge with status 402","source_url":"https://lowpaymentfee.com/api/v1/products/37/inventory"},{"claim":"Payment is in USDC on Base network with maxAmountRequired of 20000 base units (0.02 USDC)","source_url":"https://lowpaymentfee.com/api/v1/products/37/inventory"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/products/37/inventory"}],"useCases":["Querying product inventory data for product 37 on a per-request payment basis","Integrating pay-per-call inventory lookups into agent workflows without API key management","Demonstrating x402 protocol usage for micropayment-gated data access"],"bestFor":["Agents or services that need on-demand inventory data with no subscription commitment","Developers experimenting with x402 payment protocol integrations","Scenarios requiring keyless, pay-as-you-go API access on Base"],"notFor":["High-volume inventory polling where per-request costs would accumulate quickly","Use cases requiring detailed API documentation or guaranteed SLAs","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.455Z"},"updatedAt":"2026-04-22T16:30:40.992Z"}}