{"id":"0ad82df8-29fa-4ca4-9273-52126ff38856","shortId":"JWWMY3","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 access to a variety of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint at `/api/v1/stripe/charges/72` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (i.e., $0.02) per call, settled on-chain to a designated wallet address. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each POST request.\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. However, the specific functionality behind the `/api/v1/stripe/charges/72` endpoint is not documented beyond its \"Premium API Access\" label, and the crawled documentation pages (docs, pricing, README) returned only a wallet-connect prompt with no substantive content.\n\nBecause the endpoint responds with a well-formed x402 challenge (version 1, scheme \"exact\", USDC on Base), it is confirmed live. The asset address `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` matches the canonical USDC contract on Base. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 API","USDC micropayment API","pay-per-request API","Base network API","crypto-gated API","402 payment required"],"warnings":["The specific functionality of /api/v1/stripe/charges/72 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","The endpoint path includes 'stripe/charges' which may imply Stripe integration, but no details are provided — this is speculative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/72","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' is undefined. The docs, pricing, and README pages all returned only a wallet-connect prompt with no 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'/request':17,36,169 '0.02':16,35,88,168 '000':82 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':232 '1':219 '20':81 '402 payment required' 'Base network API' 'USDC micropayment API' 'access':49,75,186 'address':99,231 'advertis':124 'ai':10,29,136 'analysi':140 'analyt':130 'api':4,23,45,74,101,128,185 'asset':230 'attach':112 'base':7,26,63,83,224,239 'base-network' 'behind':55,175 'beyond':182 'broader':122 'call':90 'caller':110 'canon':235 'categori':126 'chain':94 'challeng':217 'classif':143 'commit':107 'confirm':227 'connect':201 'content':206 'contract':237 'convers':160 'crawl':190 'crypto-gated API' 'data':9,28,129,133 'design':97 'detail':246 'doc':193 'document':181,191,247 'embed':144 'endpoint':14,33,54,67,164,178,209,253 'estim':154 'exact':221 'exampl':244 'exchang':149 'export':134 'feed':148 'financ':11,30,145 'form':215 'found':249 'four':125 'function':174 'gas':153 'gate':3,22,48 'generat':161 'geocod':158 'header':116 'howev':171 'i.e':87 'infrastructur':156 'insight':135 'key':102 'label':187 'learn':138 'limit':104 'list':71,163 'live':228 'low payment fee' 'lowpaymentfee.com':39 'machin':137 'marketplac':46 'match':233 'maximum':79 'metric':131 'micropay':60 'network':64 'no-api-key' 'offer':8,27 'on-chain':92 'openapi':241 'page':192 'pay-per-request API' 'payment':115 'per':57,89 'per-request':56 'per-request-billing' 'platform':5,24,123 'post':119 'post-endpoint' 'premium':73,184 'price':147,170,194 'prompt':202 'protocol':44 'quot':152 'rate':103,150 'readm':195 'report':132 'request':58,120 'request/response':243 'requir':77,109 'respond':210 'return':196 'schema':242 'scheme':220 'sentiment':139 'settl':91 'share':165 'simpli':111 'specif':66,173,252 'substant':205 'summar':142 'text':141 'token':151 'unit':84 'upfront':106 'usdc':19,38,59,86,222,236 'usdc-micropayment' 'util':13,32,157 'valid':159 'varieti':52 'version':218 'via':18,37 'wallet':98,200 'wallet-connect':199 'web3':146 'well':214 'well-form':213 'x402':2,21,43,114,216 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"ad34dbc1-d7fb-4005-a4a3-6714c89b9d2f","listingId":"0ad82df8-29fa-4ca4-9273-52126ff38856","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/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:28.231Z"}],"sources":[{"listingId":"0ad82df8-29fa-4ca4-9273-52126ff38856","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:28.231Z","lastSeenAt":"2026-04-22T18:32:10.124Z"}],"details":{"listingId":"0ad82df8-29fa-4ca4-9273-52126ff38856","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/72 \\\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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/72"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/72"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four API categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Paying per-request for premium API access without needing API keys or subscriptions","Integrating x402-compatible agents that settle micropayments on Base in USDC","Accessing data, AI, finance, or utility endpoints with on-chain payment verification"],"bestFor":["Developers or agents that already hold USDC on Base and want frictionless API access","Use cases requiring no-signup, pay-as-you-go API consumption","x402-native agent workflows that attach payment headers automatically"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Applications requiring fiat-only payment rails with no crypto involvement","High-volume batch workloads where per-request micropayments add overhead"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.374Z"},"updatedAt":"2026-04-22T18:32:10.124Z"}}