{"id":"0f9de46b-f3b3-47c3-8b6e-63f4acfbef4d","shortId":"Bf4BzA","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/142` is listed as \"Premium API Access\" and requires a 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 subscriptions are needed. The platform accepts POST requests and returns JSON responses.\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.\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/142` path is unclear; the name \"Premium API Access\" and the path segment \"stripe/charges\" suggest it may relate to Stripe charge data or payment processing, but this cannot be confirmed from available materials.","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":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/stripe/charges/142 ('Premium API Access') is unclear — the path suggests Stripe charge data but this is unconfirmed","No request body schema or response schema documented anywhere","The broader platform lists many endpoints but none have documented input/output contracts"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/142","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/142","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, documentation is effectively nonexistent — no OpenAPI spec, no request/response schemas, no examples, and no explanation of what the endpoint actually returns. The purpose of the specific '/stripe/charges/142' path is 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'/api/v1/stripe/charges/142':67,215 '/docs':176 '/pricing':178 '/readme':180 '/request':17,36,168 '0.02':16,35,87,167 '000':82 '20':81 'Base network API' 'USDC API' 'accept':112 'access':73,223 'advertis':122 'ai':10,29,134 'analysi':138 'analyt':128 'api':4,23,45,72,100,126,222 'avail':206,246 'base':7,26,61,83 'base-network' 'behind':53,213 'broader':120 'call':90 'cannot':242 'categori':124 'charg':235 'classif':141 'confirm':244 'connect':186 'content':192 'convers':158 'crawl':209 'data':9,28,127,131,236 'document':171,201 'embed':142 'endpoint':14,33,52,65,161 'estim':152 'exact':97 'exampl':205 'exchang':147 'export':132 'extrem':173 'feed':146 'financ':11,30,143 'four':123 'function':212 'gas':151 'gate':3,22,48 'generat':159 'geocod':156 'infrastructur':154 'insight':133 'json':117 'json-response' 'key':101 'learn':136 'limit':104 'list':69,163 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':135 'made':93 'marketplac':46 'materi':247 'may':231 'metric':129 'micropay':58 'micropayment API' 'name':220 'need':109 'network':62 'no-api-key' 'offer':8,27 'openapi':196 'page':181 'path':216,226 'pay-per-request API' 'payment':77,91,238 'per':55,89 'per-request':54 'per-request-billing' 'platform':5,24,111,121 'point':170 'post':113 'post-method' 'premium':71,221 'price':145,169 'process':239 'prompt':188 'protocol':44 'quot':150 'rate':103,148 'relat':232 'render':183 'report':130 'request':56,114 'request/response':199 'requir':75 'respons':118 'return':116 'schema':200 'scheme':98 'segment':227 'sentiment':137 'spars':174 'spec':197 'specif':64,211 'stripe':234 'stripe charges API' 'stripe/charges':228 'subscript':107 'suggest':229 'summar':140 'text':139 'token':149 'unclear':218 'unit':84 'usag':204 'usd':88 'usdc':19,38,57,86 'usdc-micropayment' 'util':13,32,155 'valid':157 'varieti':50 'via':18,37,94 'wallet':187 'web3':144 'x402':2,21,43,96 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"f93f21ea-4e98-4c1f-89cf-18b0f804d7af","listingId":"0f9de46b-f3b3-47c3-8b6e-63f4acfbef4d","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/142","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:00.393Z"}],"sources":[{"listingId":"0f9de46b-f3b3-47c3-8b6e-63f4acfbef4d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/142","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:00.393Z","lastSeenAt":"2026-04-22T20:01:24.492Z"}],"details":{"listingId":"0f9de46b-f3b3-47c3-8b6e-63f4acfbef4d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/142 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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 requiring up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/142"},{"claim":"All listed APIs are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 protocol payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents that need keyless, pay-per-call API access on Base","Projects requiring low-friction API access without subscriptions"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume use cases where per-request payment overhead is impractical","Anyone requiring detailed documentation or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.678Z"},"updatedAt":"2026-04-22T20:01:24.492Z"}}