{"id":"97ea736e-c1fe-4fd5-b2a6-4852284cb5ee","shortId":"p6eWnS","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request via USDC.","description":"lowpaymentfee.com is a collection of x402-protocol pay-per-call API endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/140` is listed as \"Premium API Access\" and returns a standard x402 challenge requiring payment of up to 20,000 base units of USDC (0.02 USD) per request. The site advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four categories: 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/140` path is unclear; the name suggests it may relate to Stripe charge data, but this is not confirmed by any documentation. The endpoint is live and returns a well-formed x402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","premium API access"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or schema definition found","The specific purpose of /api/v1/stripe/charges/140 is undocumented and unclear","No request body schema or response format documented anywhere","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/140","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/140","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 challenge, but documentation is essentially nonexistent — every doc page shows only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the actual functionality behind this specific endpoint path is unclear. The listing is effectively a 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'/api/v1/stripe/charges/140':62,212 '/docs':173 '/pricing':175 '/readme':177 '/request':16,34,165 '0.02':15,33,86,164 '000':81 '20':80 'Base network API' 'USDC pay-per-call' 'access':68,101 'across':121 'advertis':92 'ai':9,27,131 'analysi':135 'analyt':8,26,125 'api':4,22,49,67,94 'attach':104 'avail':203 'base':7,25,56,82 'base-network' 'behind':210 'broader':117 'call':48 'caller':102 'categori':123 'challeng':74,245 'charg':224 'classif':138 'collect':40 'confirm':230 'connect':183 'content':189 'convers':155 'crawl':206 'data':124,128,225 'document':168,198,233 'embed':139 'endpoint':13,31,50,60,120,158,235 'estim':149 'exampl':202 'exchang':144 'export':129 'extrem':170 'feed':143 'financ':10,28,140 'form':243 'four':122 'function':209 'gas':148 'gate':3,21 'generat':156 'geocod':153 'header':109 'infrastructur':151 'insight':130 'instant':100 'key':95 'learn':133 'limit':98 'list':64,160 'live':237 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':132 'may':220 'metric':126 'micropayment API' 'name':217 'network':57 'no-api-key' 'offer':119 'openapi':193 'page':178 'path':213 'pay':46 'pay-per-cal':45 'pay-per-request' 'payment':76,108,114 'per':47,88 'platform':118 'point':167 'post-method' 'premium':66 'premium API access' 'price':142,166 'prompt':185 'proof':115 'protocol':44 'quot':147 'rate':97,145 'relat':221 'render':180 'report':127 'request':89 'request/response':196 'requir':75 'return':70,239 'schema':197 'sentiment':134 'settl':51 'simpli':103 'site':91 'spars':171 'spec':194 'specif':59,208 'standard':72 'stripe':223 'suggest':218 'suit':5,23 'summar':137 'text':136 'token':146 'unclear':215 'unit':83 'usag':201 'usd':87 'usdc':18,36,53,85 'usdc-settlement' 'util':12,30,152 'valid':112,154 'via':17,35 'wallet':184 'web3':141 'well':242 'well-form':241 'x':107 'x-payment':106 'x402':2,20,43,73,113,244 'x402 API' 'x402-gated':1,19 'x402-payment' 'x402-protocol':42","prices":[{"id":"257a1979-d17d-41a6-8b48-0ea0298efa77","listingId":"97ea736e-c1fe-4fd5-b2a6-4852284cb5ee","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/140","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:09.507Z"}],"sources":[{"listingId":"97ea736e-c1fe-4fd5-b2a6-4852284cb5ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/140","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:09.507Z","lastSeenAt":"2026-04-23T02:01:29.480Z"}],"details":{"listingId":"97ea736e-c1fe-4fd5-b2a6-4852284cb5ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/140 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/140"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/140"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Programmatic agent access to gated endpoints using x402 USDC micropayments","Testing x402 protocol integration with a live endpoint on Base"],"bestFor":["Developers exploring x402 protocol pay-per-call patterns","AI agents that need keyless, on-demand API access settled in USDC","Projects wanting to avoid subscription commitments for low-volume API usage"],"notFor":["Users needing well-documented API contracts with clear request/response schemas","High-volume production workloads where $0.02/request adds up significantly","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.238Z"},"updatedAt":"2026-04-23T02:01:29.480Z"}}