{"id":"deef8e63-f17d-489a-aade-1109f6bc85c0","shortId":"9ZFR7y","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 collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/184` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain to a designated wallet address using USDC (contract 0x8335…2913 on Base), with a maximum amount of 20,000 base units — equivalent to $0.02 USD (USDC uses 6 decimals).\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. The platform emphasizes no API keys, no rate limits, and instant access — callers simply attach an x402 payment header to each request.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The specific purpose of the `/api/v1/stripe/charges/184` endpoint (labeled \"Premium API Access\") is unclear — it does not appear in the homepage's listed API catalog, and its name suggests it may relate to Stripe charge processing, but this is unconfirmed. Callers should proceed with caution given the lack of documentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","post-endpoint","no-api-key"],"categories":["payments","infrastructure"],"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 request/response schema provided for any endpoint.","The endpoint /api/v1/stripe/charges/184 does not appear in the homepage's listed API catalog; its actual functionality is unknown.","The endpoint name references 'stripe/charges' which may imply financial transaction processing — use with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/184","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/184","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","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, no OpenAPI schema, no request/response examples, and the specific purpose of this endpoint is ambiguous. The docs pages are all empty wallet-connect 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'/api/v1/stripe/charges/184':66,228 '/docs':191 '/pricing':193 '/readme':195 '/request':17,36,161 '0.02':16,35,106,160 '000':101 '0x8335':91 '20':100 '2913':92 '6':110 'Base network API' 'USDC API' 'accept':74 'access':72,175,233 'address':87 'advertis':115 'ai':10,29,127 'amount':98 'analysi':131 'analyt':121 'api':4,23,44,71,119,168,232,245 'appear':239 'attach':178 'base':7,26,60,94,102 'base-network' 'behind':52 'broader':113 'caller':176,262 'catalog':246 'categori':117 'caution':266 'chain':82 'charg':256 'classif':134 'collect':49 'connect':201 'content':207 'contract':90 'convers':151 'data':9,28,120,124 'decim':111 'design':85 'detail':218 'document':186,219,271 'embed':135 'emphas':166 'endpoint':14,33,51,64,154,222,229 'equival':104 'estim':145 'exampl':215 'exchang':140 'export':125 'extrem':188 'feed':139 'financ':11,30,136 'four':116 'gas':144 'gate':3,22,47 'generat':152 'geocod':149 'given':267 'header':182 'homepag':242 'infrastructur':147 'insight':126 'instant':174 'key':169 'label':230 'lack':269 'learn':129 'limit':172 'list':68,156,244 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':128 'marketplac':45 'maximum':97 'may':252 'metric':122 'micropay':57 'micropayment API' 'name':249 'network':61 'no-api-key' 'offer':8,27 'on-chain':80 'openapi':211 'page':196 'pay-per-request API' 'payment':77,181 'per':54 'per-request':53 'per-request-billing' 'platform':5,24,114,165 'point':163 'post':75 'post-endpoint' 'premium':70,231 'price':138,162 'proceed':264 'process':257 'prompt':203 'protocol':43 'purpos':225 'quot':143 'rate':141,171 'relat':253 'render':198 'report':123 'request':55,76,185 'request/response':214 'schema':212 'sentiment':130 'settl':79 'simpli':177 'spars':189 'specif':63,224 'stripe':255 'stripe charges API' 'substant':206 'suggest':250 'summar':133 'text':132 'token':142 'unclear':235 'unconfirm':261 'unit':103 'usd':107 'usdc':19,38,56,89,108 'usdc-micropayment' 'use':88,109 'util':13,32,148 'valid':150 'via':18,37 'wallet':86,202 'web3':137 'x402':2,21,42,180 'x402 API' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"3732c232-2d26-415d-b418-6891251bd02e","listingId":"deef8e63-f17d-489a-aade-1109f6bc85c0","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/184","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:10.730Z"}],"sources":[{"listingId":"deef8e63-f17d-489a-aade-1109f6bc85c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/184","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:10.730Z","lastSeenAt":"2026-04-23T02:01:29.536Z"}],"details":{"listingId":"deef8e63-f17d-489a-aade-1109f6bc85c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/184 \\\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 in USDC (6 decimals) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/184"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need on-chain micropayment settlement for API calls","Exploring x402 protocol integration for per-request billing"],"bestFor":["Developers experimenting with x402 micropayment protocol","Agents that can attach on-chain USDC payments per request on Base","Use cases where $0.02/request pricing with no commitments is attractive"],"notFor":["Production workloads requiring detailed API documentation and SLAs","Users who need clear request/response schemas before integrating","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.22Z"},"updatedAt":"2026-04-23T02:01:29.536Z"}}