{"id":"c98e0e6c-35e4-43a9-99f2-245b9c96289b","shortId":"bwzjuL","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/stripe/charges/137` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address, and the endpoint returns its response as application/json.\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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific functionality behind the `/api/v1/stripe/charges/137` endpoint is unclear — it does not map to any of the documented API categories, and its name suggests it may relate to Stripe charge data or a payment-related resource. Documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","per-request-micropayment","json-response","no-api-key","no-rate-limit"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee"],"warnings":["The specific endpoint /api/v1/stripe/charges/137 does not correspond to any documented API category on the site — its actual functionality is unknown.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No request or response schema is available; callers cannot know what to send or what to expect back.","The endpoint path includes 'stripe/charges' which may indicate interaction with Stripe payment data — potential regulatory or compliance considerations."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/137","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), but there is no documentation, no request/response schema, and the specific purpose of /api/v1/stripe/charges/137 is unclear. All doc pages returned only 'Connect wallet' with no content. The listing is effectively a 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'/request':17,34 '0.02':16,33,78,167 '000':82 '20':81 '6':88 'Base network API' 'USDC API access' 'access':45,73 'actual':236 'address':112 'advertis':124 'ai':10,27,136 'analysi':140 'analyt':130 'api':4,21,41,72,128,172,200 'application/json':120 'attach':99 'base':7,24,61,83 'behind':51,185 'broader':122 'call':80 'caller':98 'categori':126,201 'charg':211 'classif':143 'commit':180 'connect':227 'content':233 'convers':160 'cost':75 'data':9,26,129,133,212 'decim':89 'doc':221 'document':199,219 'embed':144 'endpoint':14,31,50,65,115,163,188,241 'estim':154 'exact':96 'exchang':149 'export':134 'feed':148 'financ':11,28,145 'four':125 'function':184 'gas':153 'gate':3,20,44 'generat':161 'geocod':158 'handl':92 'header':104 'howev':181 'infrastructur':156 'insight':135 'json-response' 'key':173 'learn':138 'limit':176 'list':69,165 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':137 'map':194 'marketplac':42 'may':207 'metric':131 'micropay':55 'micropayment API' 'minimum':179 'name':204 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'page':220 'pay-per-request API' 'payment':90,103,108,216 'payment-rel':215 'payto':111 'per':53,79,168 'per-request':52 'per-request-micropayment' 'platform':5,22,123 'premium':71 'price':147,222 'prompt':229 'protocol':40 'quot':152 'rate':150,175 'readm':223 'relat':208,217 'report':132 'request':54,169 'request/response':237 'resourc':218 'respons':118 'return':116,224 'schema':238 'scheme':97 'sentiment':139 'settl':56 'sign':107 'specif':64,183 'stripe':210 'substant':232 'suggest':205 'summar':142 'text':141 'token':151 'unclear':190 'unit':84 'unknown':243 'usdc':58,86 'usdc-base-network' 'util':13,30,157 'valid':159 'varieti':48 'via':93 'wallet':228 'web3':146 'x':102 'x-payment':101 'x402':2,19,39,95 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"99579efc-93d4-47c8-a01e-183e5519e4a0","listingId":"c98e0e6c-35e4-43a9-99f2-245b9c96289b","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/137","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:51.299Z"}],"sources":[{"listingId":"c98e0e6c-35e4-43a9-99f2-245b9c96289b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/137","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:51.299Z","lastSeenAt":"2026-04-22T20:01:24.159Z"}],"details":{"listingId":"c98e0e6c-35e4-43a9-99f2-245b9c96289b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/137 \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -H \"Content-Type: application/json\"","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 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/137"},{"claim":"All APIs are listed at $0.02/request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Programmatic agent access to gated endpoints via x402 micropayments","Testing x402 payment flows on the Base network"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible wallets and agents on the Base network","Low-volume or sporadic API consumers who prefer no commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.125Z"},"updatedAt":"2026-04-22T20:01:24.159Z"}}