{"id":"f0189c08-dbbb-4e72-8ff3-ae66933e16d0","shortId":"fCBbhs","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/2` is labeled \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\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 listed endpoints share the same $0.02/request pricing. The x402 challenge confirms the endpoint is live, accepts POST requests, pays to address `0x1A2B...85F3`, and settles in USD Coin on Base.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The exact functionality behind the \"Premium API Access\" label at this specific path (`/stripe/charges/2`) is unclear and may relate to Stripe charge creation or lookup, but this is speculative given the lack of documentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["micropayment API","pay-per-call API","x402 endpoint","USDC API","Base network API","lowpaymentfee","stripe charges API","premium API access"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no usable content.","No OpenAPI or schema documentation is available for any endpoint.","The exact functionality of /api/v1/stripe/charges/2 ('Premium API Access') is undocumented and unclear — the path suggests Stripe charge operations but this is unconfirmed.","No example request or response payloads are available anywhere in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/2","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but documentation is effectively nonexistent — every doc page returns only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, and no examples. The specific purpose of the /stripe/charges/2 endpoint is 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'/api/v1/stripe/charges/2':67 '/docs':185 '/pricing':187 '/readme':189 '/request':17,36,155 '/stripe/charges/2':230 '0.02':16,35,77,154 '000':81 '0x1a2b':171 '20':80 '6':87 '85f3':172 'Base network API' 'USDC API' 'accept':165 'access':72,224 'address':170 'advertis':110 'ai':10,29,122 'ai-inference' 'analysi':126 'analyt':116 'api':4,23,45,71,98,114,223 'avail':216 'base':7,26,61,82,179 'base-network' 'behind':53,220 'broader':108 'call':79 'categori':112 'challeng':159 'charg':238 'classif':129 'coin':177 'confirm':160 'connect':195 'convers':146 'cost':74 'creation':239 'data':9,28,115,119 'data-analytics' 'decim':88 'detail':202 'document':180,211,250 'embed':130 'endpoint':14,33,52,65,150,162 'estim':140 'exact':95,218 'exampl':214 'exchang':135 'export':120 'extrem':182 'feed':134 'financ':11,30,131 'finance-data' 'four':111 'function':219 'gas':139 'gate':3,22,48 'generat':147 'geocod':144 'given':246 'infrastructur':142 'insight':121 'key':99 'label':69,225 'lack':248 'learn':124 'limit':102 'list':149 'live':164 'lookup':241 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':123 'made':91 'marketplac':46 'may':234 'metric':117 'micropay':58 'micropayment API' 'network':62 'no-api-key' 'offer':8,27 'openapi':206 'page':190 'path':229 'pay':168 'pay-per-call API' 'payload':215 'payment':89 'per':55,78 'per-request':54 'per-request-billing' 'platform':5,24,109 'post':166 'post-endpoint' 'premium':70,222 'premium API access' 'price':133,156 'prompt':197 'protocol':44 'quot':138 'rate':101,136 'relat':235 'render':192 'report':118 'request':56,167 'request/response':209 'requir':106 'schema':210 'scheme':96 'sentiment':125 'settl':174 'share':151 'spars':183 'spec':207 'specif':64,228 'specul':245 'stripe':237 'stripe charges API' 'subscript':105 'summar':128 'technic':201 'text':127 'token':137 'unclear':232 'unit':83 'usd':176 'usdc':19,38,57,85 'usdc-micropayment' 'util':13,32,143 'utility-services' 'valid':145 'varieti':50 'via':18,37,92 'wallet':196 'web3':132 'x402':2,21,43,94,158 'x402 endpoint' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"bd6c7650-3816-4225-bdfa-343ae735fb61","listingId":"f0189c08-dbbb-4e72-8ff3-ae66933e16d0","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/2","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:13.671Z"}],"sources":[{"listingId":"f0189c08-dbbb-4e72-8ff3-ae66933e16d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/2","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:13.671Z","lastSeenAt":"2026-04-22T18:04:14.310Z"}],"details":{"listingId":"f0189c08-dbbb-4e72-8ff3-ae66933e16d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/2 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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/2"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for data analytics or AI inference without managing API keys or subscriptions","Accessing financial price feeds and exchange rates via crypto micropayments","Using utility endpoints like geocoding or validation with instant USDC settlement on Base"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","Agents and bots that can settle x402 payments autonomously on Base","Projects needing low-friction access to multiple API categories without signup"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.025Z"},"updatedAt":"2026-04-22T18:04:14.310Z"}}