{"id":"518577ce-053b-4abc-a762-fc7297953908","shortId":"GhMnqH","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/84` is listed as \"Premium API Access\" and accepts payment of up to 20,000 base units of USDC (0.02 USD) per call. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no sign-up required. The platform settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`).\n\nThe broader platform advertises four categories of endpoints: 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\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 spec, no request/response schema documentation, and no usage examples available from the crawl. The specific functionality behind the `/api/v1/stripe/charges/84` path is unclear; the path suggests it may relate to Stripe charge data, but no documentation confirms what this endpoint returns. Agents should treat this as a low-documentation endpoint and test carefully before relying on it in production.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["api-marketplace","finance"],"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 show only 'Connect wallet' with no content.","No OpenAPI spec or request/response schema provided.","The purpose of the specific endpoint '/api/v1/stripe/charges/84' is unclear; the path suggests Stripe charge data but nothing confirms this.","The platform lists many endpoint categories but it is unknown whether they all function or are placeholders."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/84","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually does, no request/response schemas, no examples, and the docs pages are empty. The path '/api/v1/stripe/charges/84' is opaque without further 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'/api/v1/stripe/charges/84':69,221 '/docs':182 '/pricing':184 '/readme':186 '/request':17,36,174 '0.02':16,35,88,173 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':118 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':124 '20':82 'Base network API' 'USDC API' 'accept':77 'access':49,75 'address':117 'advertis':128 'agent':243 'ai':10,29,140 'analysi':144 'analyt':134 'api':4,23,45,74,101 'avail':212 'base':7,26,63,84,122 'base-network' 'behind':55,219 'broader':126 'call':91 'care':255 'categori':130 'charg':233 'classif':147 'confirm':238 'connect':192 'content':198 'contract':123 'convers':164 'crawl':215 'data':9,28,133,137,234 'document':177,207,237,251 'embed':148 'endpoint':14,33,54,67,132,167,241,252 'estim':158 'exact':98 'exampl':211 'exchang':153 'export':138 'extrem':179 'feed':152 'financ':11,30,149 'four':129 'function':218 'gas':157 'gate':3,22,48 'generat':165 'geocod':162 'infrastructur':160 'insight':139 'json-response' 'key':102 'learn':142 'limit':105 'list':71,169 'low':250 'low-document':249 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':141 'made':94 'marketplac':46 'may':229 'metric':135 'micropay':60 'micropayment API' 'network':64 'no-api-key' 'offer':8,27 'openapi':202 'page':187 'path':222,226 'pay-per-request API' 'payment':78,92,115 'per':57,90 'per-request':56 'per-request-billing' 'platform':5,24,113,127 'point':176 'post-method' 'premium':73 'price':151,175 'product':261 'prompt':194 'protocol':44 'quot':156 'rate':104,154 'relat':230 'reli':257 'render':189 'report':136 'request':58 'request/response':205 'requir':111 'return':242 'schema':206 'scheme':99 'sentiment':143 'settl':114 'sign':109 'sign-up':108 'spars':180 'spec':203 'specif':66,217 'stripe':232 'stripe charges API' 'suggest':227 'summar':146 'test':254 'text':145 'token':155 'treat':245 'unclear':224 'unit':85 'usag':210 'usd':89 'usdc':19,38,59,87,120 'usdc-micropayment' 'use':119 'util':13,32,161 'valid':163 'varieti':52 'via':18,37,95 'wallet':193 'web3':150 'x402':2,21,43,97 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"ea8c0437-2f05-46aa-93a5-a829661a0b5c","listingId":"518577ce-053b-4abc-a762-fc7297953908","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/84","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:31.873Z"}],"sources":[{"listingId":"518577ce-053b-4abc-a762-fc7297953908","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/84","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:31.873Z","lastSeenAt":"2026-04-22T18:32:10.361Z"}],"details":{"listingId":"518577ce-053b-4abc-a762-fc7297953908","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/84 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/84"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/84"},{"claim":"The platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-call endpoints into agent workflows without subscription commitments"],"bestFor":["Agents or developers who want keyless, pay-per-request API access","Users already holding USDC on Base who want frictionless micropayments","Prototyping and ad-hoc queries where subscription plans are overkill"],"notFor":["High-volume production workloads where per-request fees add up quickly","Users who need detailed API documentation and guaranteed SLAs","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.208Z"},"updatedAt":"2026-04-22T18:32:10.361Z"}}