{"id":"897723be-5ace-4c72-8862-b2ee3b60e654","shortId":"HZkzXt","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace offering a broad set of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The specific endpoint at `/api/v1/products/77` is labeled \"Premium API Access\" and returns `application/json` via POST.\n\nThe platform advertises four main categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure (geocoding, validation, conversion, generation). All endpoints appear to follow the same x402 payment flow — callers send a POST with an `X-PAYMENT` header containing a signed payment proof, and the server returns the requested data.\n\nThe `/api/v1/products/77` endpoint was probed and returned a valid 402 challenge with `maxAmountRequired` of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02. Payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-marketplace","data","ai"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The docs, pricing, and API pages render only 'Connect wallet' with no usable content","The specific purpose of /api/v1/products/77 ('Premium API Access') is undefined — no description of what data it returns","No example responses available to verify endpoint functionality beyond the 402 challenge"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/77","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/77","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 402 challenge with clear pricing. However, there is no OpenAPI schema, no documentation beyond a landing page listing, no example request/response bodies, and no description of what /api/v1/products/77 actually returns. The docs/pricing/API pages are all blank (\"Connect wallet\" only). This is effectively a stub 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'/call':13,28 '0.02':12,27,57,191 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':197 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':184 '20000':179 '300':200 '402':174 '402 payment api' '6':187 'access':87 'across':45 'address':196 'advertis':95 'ai':108 'ai/ml':48 'analysi':112 'analyt':47,102 'api':5,20,37,69,86,100,217 'appear':135 'application/json':90 'base':8,23,65,180,186 'base network api' 'broad':41 'caller':143 'categori':98 'challeng':175 'classif':115 'commit':77 'connect':223 'contain':153 'content':229 'convers':131 'cost':56 'data':46,101,105,164 'decim':188 'detail':206 'doc':214 'document':207 'embed':116 'enabl':36 'endpoint':44,55,80,134,167 'equal':190 'estim':126 'everi':54 'exampl':209 'exchang':121 'export':106 'feed':120 'financ':117 'finance/web3':50 'flow':142 'follow':137 'found':212 'four':96 'gas':125 'generat':132 'geocod':129 'header':152 'infer':49 'infrastructur':52,128 'insight':107 'json-response' 'key':70 'label':84 'learn':110 'limit':73 'low payment fee' 'lowpaymentfee.com':31 'machin':109 'main':97 'marketplac':38 'maxamountrequir':177 'metric':103 'micropayment api' 'network':9,24,66 'no-api-key' 'offer':39 'openapi':204 'page':218 'paid':60 'pay':2,17 'pay per call api' 'pay-per-request':1,16 'payment':141,151,156,192 'per':3,18,58 'platform':6,21,94 'post':92,146 'post-method' 'premium':85 'price':119,215 'probe':169 'prompt':225 'proof':157 'quot':124 'rate':72,122 'render':220 'report':104 'request':4,19,59,163 'respons':210 'return':89,161,171 'schema':205 'second':201 'send':144 'sent':194 'sentiment':111 'server':160 'set':42 'sign':155 'specif':79 'summar':114 'text':113 'timeout':202 'token':123 'unit':181 'upfront':76 'usdc':15,30,62,183 'usdc api' 'usdc-base' 'util':53 'valid':130,173 'via':10,25,91 'wallet':224 'web3':118 'x':150 'x-payment':149 'x402':11,26,35,140 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"dbcb414a-c1f3-4dc2-9b6e-87d36d380d6e","listingId":"897723be-5ace-4c72-8862-b2ee3b60e654","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/77","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:12.527Z"}],"sources":[{"listingId":"897723be-5ace-4c72-8862-b2ee3b60e654","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/77","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:12.527Z","lastSeenAt":"2026-04-22T21:30:31.739Z"}],"details":{"listingId":"897723be-5ace-4c72-8862-b2ee3b60e654","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/77 \\\n  -H \"X-PAYMENT: <x402-signed-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge for /api/v1/products/77 specifies maxAmountRequired of 20000 base units of USDC on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/products/77"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/77"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without signing up for an account or managing API keys","Making one-off paid API calls from an AI agent using x402 USDC payments on Base","Integrating pay-as-you-go analytics, AI inference, or finance data into automated workflows"],"bestFor":["Developers wanting zero-friction, keyless API access via crypto micropayments","AI agents that can autonomously pay for API calls using x402 protocol","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Teams requiring fiat payment options or invoicing","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.581Z"},"updatedAt":"2026-04-22T21:30:31.739Z"}}