{"id":"77f664c9-f289-4cc4-8b8a-91526386ac2d","shortId":"7GMm9j","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 a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/146` is listed as \"Premium API Access\" and accepts x402 payments of up to 20,000 base units of USDC (i.e., $0.02) per call. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. The specific endpoint being listed here (`/api/v1/stripe/charges/146`) does not clearly map to any of these documented categories — its path suggests it may relate to Stripe charge operations, but no further documentation is available.\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 spec, no request/response schema documentation, and no usage examples. The endpoint is confirmed live (returns a proper 402 challenge), but without knowing what request body to send or what response to expect, practical integration requires experimentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","stripe charges API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a 'Connect wallet' prompt with no content.","No OpenAPI or schema definition found; request body format and response structure are unknown.","The endpoint path '/api/v1/stripe/charges/146' does not correspond to any of the documented API categories on the landing page; its actual functionality is unclear.","The numeric ID '146' in the path is unexplained and may indicate a specific resource rather than a general-purpose endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/146","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the endpoint path ('stripe/charges/146') doesn't match any of the documented API categories. The docs pages are all empty wallet-connect prompts. This is effectively a stub 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'/api/v1/stripe/charges/146':67,176 '/docs':208 '/pricing':210 '/readme':212 '/request':17,36,168 '0.02':16,35,88,167 '000':82 '20':81 '402':246 'Base network API' 'USDC API' 'accept':75 'access':73 'advertis':124 'ai':10,29,135 'analysi':139 'analyt':129 'api':4,23,45,72,100 'attach':110 'avail':202 'base':7,26,61,83 'base-network' 'behind':53 'bodi':253 'broader':122 'call':90 'caller':108 'categori':127,186 'challeng':247 'charg':195 'classif':142 'clear':179 'confirm':241 'connect':218 'content':224 'convers':159 'data':9,28,128,132 'document':185,200,203,233 'embed':143 'endpoint':14,33,52,65,126,163,172,239 'estim':153 'exact':97 'exampl':237 'exchang':148 'expect':260 'experiment':264 'export':133 'extrem':205 'feed':147 'financ':11,30,144 'four':125 'gas':152 'gate':3,22,48 'generat':160 'geocod':157 'header':115 'i.e':87 'infrastructur':155 'insight':134 'integr':262 'json-response' 'key':101 'know':250 'learn':137 'limit':105 'list':69,162,174 'live':242 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':136 'made':93 'map':180 'marketplac':46 'may':191 'metric':130 'micropay':58 'micropayment API' 'network':62 'no-api-key' 'offer':8,27 'openapi':228 'oper':196 'page':213 'path':188 'pay-per-request API' 'payment':77,91,114,119 'per':55,89 'per-request':54 'per-request-billing' 'platform':5,24,123 'post-method' 'practic':261 'premium':71 'price':146,169 'prompt':220 'proof':120 'proper':245 'protocol':44 'quot':151 'rate':104,149 'relat':192 'render':215 'report':131 'request':56,252 'request/response':231 'requir':107,263 'respons':258 'return':243 'schema':232 'scheme':98 'send':255 'sentiment':138 'share':164 'simpli':109 'spars':206 'spec':229 'specif':64,171 'stripe':194 'stripe charges API' 'subscript':102 'substant':223 'suggest':189 'summar':141 'text':140 'token':150 'unit':84 'usag':236 'usdc':19,38,57,86 'usdc-micropayment' 'util':13,32,156 'valid':118,158 'varieti':50 'via':18,37,94 'wallet':219 'web3':145 'without':249 'x':113 'x-payment':112 'x402':2,21,43,76,96 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"e0134057-7c42-4125-b1aa-630c7b66b956","listingId":"77f664c9-f289-4cc4-8b8a-91526386ac2d","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/146","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:05.252Z"}],"sources":[{"listingId":"77f664c9-f289-4cc4-8b8a-91526386ac2d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/146","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:05.252Z","lastSeenAt":"2026-04-22T20:01:24.648Z"}],"details":{"listingId":"77f664c9-f289-4cc4-8b8a-91526386ac2d","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a valid USDC payment proof on Base.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/146\n# Returns 402 with x402 challenge. Use an x402-compatible client to attach payment.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/146"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/146"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that need to pay for API calls on-chain via USDC on Base","Exploring x402-protocol integration patterns with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integration","AI agents that can autonomously pay for API calls via on-chain USDC","Users who want zero-commitment, pay-as-you-go API access"],"notFor":["Production workloads requiring well-documented request/response schemas","Users who need traditional API key authentication or OAuth flows","Anyone needing free or high-volume bulk-priced API access"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.474Z"},"updatedAt":"2026-04-22T20:01:24.648Z"}}