{"id":"31feafa1-f8e6-43e5-86ef-2696312c6af3","shortId":"DQhuKS","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/45` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme to the specified payTo address, with a 300-second timeout.\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 uniformly priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The actual functionality behind this specific endpoint (stripe/charges/45) is unclear from the available material; the name suggests it may relate to Stripe charge operations, but no schema or description beyond the generic title is provided.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","stripe charges API"],"warnings":["No OpenAPI schema or endpoint documentation available","All doc pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/stripe/charges/45 is unclear — the name suggests Stripe charge functionality but no details are provided","No request or response examples available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/45","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/stripe/charges/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs showing only 'Connect wallet'. The purpose of this specific endpoint (stripe/charges/45) is ambiguous. Effectively a stub 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'/api/v1/stripe/charges/45':69 '/docs':191 '/pricing':193 '/readme':195 '/request':17,36 '0.02':16,35,100,171 '000':89 '0x8335':94 '20':88 '2913':95 '300':121 '6':104 'Base network API' 'USDC API access' 'accept':77 'access':49,75 'actual':224 'address':118 'advertis':127 'ai':10,29,139 'analysi':143 'analyt':133 'api':4,23,45,74,131,176 'avail':235 'base':7,26,63,90,97 'base-network' 'behind':55,226 'beyond':252 'broader':125 'categori':129 'challeng':82 'charg':245 'classif':146 'commit':184 'connect':201 'content':207 'convers':163 'data':9,28,132,136 'decim':105 'descript':251 'detail':218 'document':186,219 'embed':147 'endpoint':14,33,54,67,166,222,229 'equal':99 'estim':157 'exact':112 'exampl':215 'exchang':152 'export':137 'extrem':188 'feed':151 'financ':11,30,148 'four':128 'function':225 'gas':156 'gate':3,22,48 'generat':164 'generic':254 'geocod':161 'given':101 'indic':83 'infrastructur':159 'insight':138 'json-response' 'key':177 'learn':141 'limit':180 'list':71 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'x402':2,21,43,81,111 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"0fc90aa7-a992-44dc-bca9-cb2fcd448544","listingId":"31feafa1-f8e6-43e5-86ef-2696312c6af3","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/stripe/charges/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:13.085Z"}],"sources":[{"listingId":"31feafa1-f8e6-43e5-86ef-2696312c6af3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:13.085Z","lastSeenAt":"2026-04-22T18:32:07.647Z"}],"details":{"listingId":"31feafa1-f8e6-43e5-86ef-2696312c6af3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/45 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/45"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories are listed: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without needing API keys or subscriptions","Integrating x402-compatible agents with low-cost utility endpoints","Accessing premium API functionality via on-chain USDC micropayments on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","x402-compatible AI agents that can settle USDC payments on Base","Prototyping and low-volume usage where $0.02/call is cost-effective"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users who need comprehensive API documentation and request/response schemas before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.104Z"},"updatedAt":"2026-04-22T18:32:07.647Z"}}