{"id":"25bf8333-8371-4c33-bdf2-4696c22bc9cf","shortId":"JejPXc","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/products/69` is listed as \"Premium API Access\" and accepts POST requests with payment via the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0x8335…), which equals $0.02 per request given USDC's 6 decimal places.\n\nThe broader platform advertises four 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, no minimums, and instant access — callers simply attach an x402 payment header to each request.\n\nDocumentation 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 detailed documentation for what the `/api/v1/products/69` endpoint actually returns or what input it expects beyond a POST method. The x402 challenge confirms the endpoint is live and correctly returning a 402 payment challenge, but the actual functionality behind this specific product ID is unclear.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-method","json-response"],"categories":["api-marketplace","data"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","402 payment API","crypto-gated API"],"warnings":["No documentation available — all doc/API/pricing/README pages show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/v1/products/69","The purpose and output of this specific endpoint (products/69) is entirely unclear","Cannot verify actual functionality behind the payment wall"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/69","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation for what this endpoint actually does or returns. No OpenAPI schema, no examples, and all doc pages render only 'Connect wallet'. The specific product (ID 69) has no description beyond the generic 'Premium API Access' 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'/request':17,34,156 '0.02':16,33,98,155 '000':90 '0x8335':95 '20':89 '402':245 '402 payment API' '6':104 'Base USDC API' 'accept':74 'access':44,72,172 'actual':222,250 'advertis':110 'ai':10,27,122 'amount':86 'analysi':126 'analyt':116 'api':4,21,40,71,114,163,189 'attach':175 'base':7,24,60,91 'base-network' 'behind':50,252 'beyond':229 'broader':108 'caller':173 'categori':112 'challeng':235,247 'classif':129 'confirm':236 'connect':198 'content':204 'convers':146 'correct':242 'crypto-gated API' 'data':9,26,115,119 'decim':105 'detail':215 'doc':188 'document':183,216 'embed':130 'emphas':161 'endpoint':14,31,49,64,149,221,238 'equal':97 'estim':140 'exact':82 'exampl':212 'exchang':135 'expect':228 'export':120 'extrem':185 'feed':134 'financ':11,28,131 'four':111 'function':251 'gas':139 'gate':3,20,43 'generat':147 'geocod':144 'given':101 'header':179 'id':256 'infrastructur':142 'input':226 'insight':121 'instant':171 'json-response' 'key':164 'learn':124 'limit':167 'list':68,151 'live':240 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'marketplac':41 'maximum':85 'method':232 'metric':117 'micropay':54 'micropayment API' 'minimum':169 'network':61 'no-api-key' 'offer':8,25 'openapi':208 'page':193 'pay-per-request API' 'payment':78,178,246 'per':52,99 'per-request':51 'per-request-billing' 'place':106 'platform':5,22,109,160 'point':158 'post':75,231 'post-method' 'premium':70 'price':133,157,190 'product':255 'prompt':200 'protocol':39 'quot':138 'rate':136,166 'readm':192 'render':195 'report':118 'request':53,76,100,182 'request/response':211 'requir':87 'return':223,243 'schema':209 'scheme':83 'sentiment':125 'settl':55 'simpli':174 'spars':186 'specif':63,254 'substant':203 'summar':128 'text':127 'token':137 'unclear':258 'unit':92 'usdc':57,94,102 'usdc-micropayment' 'util':13,30,143 'valid':145 'varieti':47 'via':79 'wallet':199 'web3':132 'x402':2,19,38,81,177,234 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"8f925d1e-cda5-44b4-b1ed-57b17310d84e","listingId":"25bf8333-8371-4c33-bdf2-4696c22bc9cf","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/69","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:01.799Z"}],"sources":[{"listingId":"25bf8333-8371-4c33-bdf2-4696c22bc9cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/69","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:01.799Z","lastSeenAt":"2026-04-23T19:00:37.082Z"}],"details":{"listingId":"25bf8333-8371-4c33-bdf2-4696c22bc9cf","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/products/69 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/products/69"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/69"}],"useCases":["Accessing premium API data without subscription or API key management","Making one-off paid API calls from autonomous agents via x402 protocol","Integrating pay-per-use endpoints into workflows that settle on Base L2"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can autonomously pay for API calls via x402","Projects already operating on the Base network with USDC"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.919Z"},"updatedAt":"2026-04-23T19:00:37.082Z"}}