{"id":"42a256c9-288a-44c2-b322-aa76b0a127f7","shortId":"542PuC","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/products/19` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per request. The site advertises no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\n\nThe broader platform organizes its endpoints into four categories: 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.\n\nHowever, the `/api/v1/products/19` path does not clearly map to any of the named endpoints on the landing page, and no documentation, OpenAPI schema, or example request/response payloads are available. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Without schema details or documentation, it is unclear what input this specific endpoint expects or what it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","http-post"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The path /api/v1/products/19 does not correspond to any named endpoint on the landing page","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no useful content","No example request or response payloads are available; input format is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/19","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/19","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 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no documentation beyond a landing page, no example requests or responses, and the specific product path (/api/v1/products/19) is not explained anywhere on the site. This is effectively a stub 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'/request':16,32,154 '0.02':15,31,78,153 '000':73 '20':72 '402':67 'Base network API' 'USDC API' 'access':63,93 'addit':201 'advertis':84 'ai':9,25,120 'analysi':124 'analyt':8,24,114 'api':4,20,45,62,86,190 'attach':96 'avail':185 'base':7,23,52,74 'base-network' 'broader':105 'call':44 'caller':94 'categori':112 'challeng':68 'classif':127 'clear':163 'collect':36 'connect':196 'content':202 'convers':144 'data':113,117 'detail':205 'doc':187 'document':177,207 'embed':128 'endpoint':13,29,46,56,109,147,170,215 'estim':138 'exampl':181 'exchang':133 'expect':216 'export':118 'feed':132 'financ':10,26,129 'four':111 'gas':137 'gate':3,19 'generat':145 'geocod':142 'header':100 'howev':157 'http-post' 'infrastructur':140 'input':212 'insight':119 'instant':92 'key':87 'land':173 'learn':122 'limit':90 'list':59,149 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':121 'map':164 'metric':115 'micropayment API' 'name':169 'network':53 'no-api-key' 'openapi':178 'organ':107 'page':174,191 'path':160 'pay':42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payload':183 'payment':99 'per':43,80 'platform':106 'point':156 'premium':61 'price':131,155,188 'prompt':198 'protocol':40 'quot':136 'rate':89,134 'render':193 'report':116 'request':69,81,103 'request/response':182 'return':65,220 'schema':179,204 'sentiment':123 'settl':47 'simpli':95 'site':83 'specif':55,214 'suit':5,21 'summar':126 'text':125 'token':135 'unclear':210 'unit':75 'usd':79 'usdc':49,77 'usdc-settlement' 'util':12,28,141 'valid':143 'wallet':197 'web3':130 'without':203 'x402':2,18,39,98 'x402 API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"010bd3fa-2c16-49df-880f-60f4425ee510","listingId":"42a256c9-288a-44c2-b322-aa76b0a127f7","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:54.977Z"}],"sources":[{"listingId":"42a256c9-288a-44c2-b322-aa76b0a127f7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:54.977Z","lastSeenAt":"2026-04-22T13:30:28.834Z"}],"details":{"listingId":"42a256c9-288a-44c2-b322-aa76b0a127f7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/19 \\\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 requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/19"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a variety of utility and data endpoints without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled via crypto micropayments","Exploring x402 protocol integration with USDC on Base"],"bestFor":["Developers experimenting with x402 pay-per-call protocols","Agents that need keyless, on-demand API access with crypto settlement","Low-volume or sporadic API consumers who prefer pay-as-you-go pricing"],"notFor":["Production workloads requiring documented schemas and SLAs","Users who need fiat-only payment options","High-throughput use cases where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.343Z"},"updatedAt":"2026-04-22T13:30:28.834Z"}}