{"id":"f4880cd2-3314-4995-806f-7d9bfd52f892","shortId":"R7LSN8","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","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/138` is listed as \"Premium API Access\" and costs $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 endpoints are listed at the same $0.02/request price point and settle in USDC on Base to address 0x1A2B...85F3.\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/138` path is unclear; the name \"Premium API Access\" and the path segment \"stripe/charges\" suggest it may relate to Stripe charge data, but this is speculative. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no usable content.","No OpenAPI or schema documentation available for any endpoint.","The specific purpose of /api/v1/stripe/charges/138 ('Premium API Access') is unclear — the path suggests Stripe charge data but this is unconfirmed.","No request body schema or response schema is documented anywhere."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/138","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the actual functionality of this specific endpoint is 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'/api/v1/stripe/charges/138':62,207 '/docs':168 '/pricing':170 '/readme':172 '/request':17,34,150 '0.02':16,33,71,149 '000':75 '0x1a2b':161 '20':74 '402':241 '6':81 '85f3':162 'Base network API' 'USDC API' 'access':68,215 'address':160 'advertis':104 'ai':10,27,116 'ai-inference' 'analysi':120 'analyt':110 'api':4,21,40,67,92,108,214 'avail':198 'base':7,24,56,76,158 'base-network' 'behind':48,205 'broader':102 'call':73 'categori':106 'challeng':242 'charg':227 'classif':123 'confirm':236 'connect':178 'content':184 'convers':140 'cost':70 'crawl':201 'data':9,26,109,113,228 'data-analytics' 'decim':82 'document':163,193 'embed':124 'endpoint':14,31,47,60,143,234 'estim':134 'exact':89 'exampl':197 'exchang':129 'export':114 'extrem':165 'feed':128 'financ':11,28,125 'finance-data' 'four':105 'function':204 'gas':133 'gate':3,20,43 'generat':141 'geocod':138 'infrastructur':136 'insight':115 'key':93 'learn':118 'limit':96 'list':64,145 'live':237 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':117 'made':85 'marketplac':41 'may':223 'metric':111 'micropay':53 'micropayment API' 'name':212 'network':57 'no-api-key' 'offer':8,25 'openapi':188 'page':173 'path':208,218 'pay-per-request API' 'payment':83 'per':50,72 'per-request':49 'per-request-billing' 'platform':5,22,103 'point':152 'premium':66,213 'price':127,151 'prompt':180 'protocol':39 'quot':132 'rate':95,130 'relat':224 'render':175 'report':112 'request':51 'request/response':191 'requir':100 'schema':192 'scheme':90 'segment':219 'sentiment':119 'settl':154 'spars':166 'spec':189 'specif':59,203 'specul':232 'stripe':226 'stripe/charges':220 'subscript':99 'suggest':221 'summar':122 'text':121 'token':131 'unclear':210 'unit':77 'usag':196 'usdc':52,79,156 'usdc-micropayment' 'util':13,30,137 'utility-services' 'valid':139,240 'varieti':45 'via':86,238 'wallet':179 'web3':126 'x402':2,19,38,88 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"316a581c-6291-4600-8a3b-27412a5d2e2c","listingId":"f4880cd2-3314-4995-806f-7d9bfd52f892","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:51.904Z"}],"sources":[{"listingId":"f4880cd2-3314-4995-806f-7d9bfd52f892","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:51.904Z","lastSeenAt":"2026-04-22T20:01:24.179Z"}],"details":{"listingId":"f4880cd2-3314-4995-806f-7d9bfd52f892","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/138 \\\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 valid x402 challenge with maxAmountRequired of 20000 USDC base units (=$0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/138"},{"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":"Pricing is $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/138"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Micropayment-gated data retrieval for analytics or finance workflows","AI inference tasks (sentiment, summarization, classification) paid per call","Utility operations like geocoding or data conversion with no subscription"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access","Prototyping workflows that need diverse API categories without signup"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or guaranteed SLAs","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.052Z"},"updatedAt":"2026-04-22T20:01:24.179Z"}}