{"id":"c4559415-927d-4e4c-b4b4-76abea22c1ee","shortId":"hsfpcf","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/133` is listed as \"Premium API Access\" and accepts payment via the x402 exact scheme. The 402 challenge confirms it is live, accepting POST requests, and requires up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\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 example payloads available. The exact functionality behind the `/api/v1/stripe/charges/133` path is unclear; the name suggests it may relate to Stripe charge data, but no details are provided. Users should expect to experiment or contact the provider for specifics.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API","Base network API","lowpaymentfee","stripe charges API","402 payment endpoint"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema for request or response bodies","The endpoint path '/api/v1/stripe/charges/133' suggests Stripe charge data but its actual functionality is undocumented","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/133","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/133","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, no examples, and the purpose of this specific endpoint (/api/v1/stripe/charges/133) is ambiguous. All doc pages return only 'Connect wallet' with no 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'/api/v1/stripe/charges/133':67,227 '/docs':191 '/pricing':193 '/readme':195 '/request':17,36 '0.02':16,35,108,172 '000':97 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':120 '0x8335':102 '20':96 '2913':103 '300':123 '402':83 '402 payment endpoint' '6':113 'Base network API' 'USDC API' 'accept':75,89 'access':73 'across':131 'address':119 'advertis':129 'ai':10,29,141 'analysi':145 'analyt':135 'api':4,23,45,72,177 'avail':221 'base':7,26,61,98,105 'base-network' 'behind':53,225 'broader':127 'call':110 'categori':133 'challeng':84 'charg':239 'classif':148 'commit':185 'confirm':85 'connect':201 'contact':252 'content':207 'convers':165 'data':9,28,134,138,240 'decim':114 'detail':243 'document':186,216 'embed':149 'endpoint':14,33,52,65,130,168 'equal':107 'estim':159 'exact':80,223 'exampl':219 'exchang':154 'expect':248 'experi':250 'export':139 'extrem':188 'feed':153 'financ':11,30,150 'four':132 'function':224 'gas':158 'gate':3,22,48 'generat':166 'geocod':163 'infrastructur':161 'insight':140 'json-response' 'key':178 'learn':143 'limit':181 'list':69,170 'live':88 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':142 'marketplac':46 'may':235 'metric':136 'micropay':58 'micropayment API' 'minimum':184 'name':232 'network':62 'no-api-key' 'offer':8,27 'openapi':211 'page':196 'path':228 'pay-per-call API' 'payload':220 'payment':76,115 'per':55,109,173 'per-request':54 'per-request-billing' 'platform':5,24,128 'post':90 'post-endpoint' 'premium':71 'price':152 'prompt':203 'protocol':44 'provid':245,254 'quot':157 'rate':155,180 'relat':236 'render':198 'report':137 'request':56,91,174 'request/response':214 'requir':93 'schema':215 'scheme':81 'second':124 'sent':117 'sentiment':144 'spars':189 'spec':212 'specif':64,256 'stripe':238 'stripe charges API' 'suggest':233 'summar':147 'text':146 'timeout':125 'token':156 'unclear':230 'unit':99 'usdc':19,38,57,101,111 'usdc-micropayment' 'use':112 'user':246 'util':13,32,162 'valid':164 'varieti':50 'via':18,37,77 'wallet':202 'web3':151 'x402':2,21,43,79 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"73e5740e-3cc3-48ee-9193-ff5ee14fddc4","listingId":"c4559415-927d-4e4c-b4b4-76abea22c1ee","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/133","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:59.801Z"}],"sources":[{"listingId":"c4559415-927d-4e4c-b4b4-76abea22c1ee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/133","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:59.801Z","lastSeenAt":"2026-04-22T20:01:24.454Z"}],"details":{"listingId":"c4559415-927d-4e4c-b4b4-76abea22c1ee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/133 \\\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 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/133"},{"claim":"The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/133"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API data with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC on Base for per-request access","Users who want no-signup, no-API-key access to utility endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.698Z"},"updatedAt":"2026-04-22T20:01:24.454Z"}}