{"id":"7b978ced-f927-4eea-8f98-c0c4eeadcc9d","shortId":"kPkbGN","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/67` is listed as \"Premium API Access\" and accepts payment via the x402 exact scheme. The 402 challenge indicates a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request. The platform 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint being listed here (`/api/v1/stripe/charges/67`) does not clearly map to any of these documented categories — its path suggests it may relate to Stripe charge operations, but no further documentation was found.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge returned successfully), but what it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","stripe charges API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all return only a 'Connect wallet' prompt","No OpenAPI or schema definition found for any endpoint","The endpoint path /api/v1/stripe/charges/67 does not match any of the documented API categories on the homepage","Request and response formats are completely unknown","The platform's actual functionality behind the paywall is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/67","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/67","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 via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific endpoint path (/api/v1/stripe/charges/67) doesn't match any documented API category, making its purpose unclear. All doc pages returned only 'Connect wallet' with no 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'/api/v1/stripe/charges/67':67,191 '/docs':223 '/pricing':225 '/readme':227 '/request':17,36,182 '0.02':16,35,105,181 '000':91 '0x8335':96 '20':90 '2913':97 '402':83,262 '6':102 'Base network API' 'USDC API access' 'accept':75 'access':73,119 'across':139 'actual':269 'advertis':110 'ai':10,29,149 'amount':88 'analysi':153 'analyt':143 'api':4,23,45,72,112 'attach':122 'avail':253 'base':7,26,61,92,99 'base-network' 'behind':53 'broader':135 'caller':120 'categori':141,201 'challeng':84,263 'charg':210 'classif':156 'clear':194 'confirm':260 'connect':233 'content':239 'convers':173 'crawl':256 'data':9,28,142,146 'decim':103 'document':200,215,218,248 'embed':157 'endpoint':14,33,52,65,138,177,187,258 'equal':104 'estim':167 'exact':80 'exampl':252 'exchang':162 'export':147 'extrem':220 'feed':161 'financ':11,30,158 'found':217 'four':140 'gas':166 'gate':3,22,48 'generat':174 'geocod':171 'header':127 'howev':184 'indic':85 'infrastructur':169 'insight':148 'instant':118 'json-response' 'key':113 'learn':151 'limit':116 'list':69,176,189 'live':261 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':150 'map':195 'marketplac':46 'max':87 'may':206 'metric':144 'micropay':58 'micropayment API' 'network':62 'no-api-key' 'offer':8,27,137 'openapi':243 'oper':211 'page':228 'path':203 'pay-per-call API' 'payment':76,126,132,273 'per':55,106 'per-request':54 'per-request-billing' 'platform':5,24,109,136 'premium':71 'price':160,183 'prompt':235 'proof':133 'protocol':44 'quot':165 'rate':115,163 'relat':207 'report':145 'request':56,107 'request/response':246 'return':230,264,270 'schema':247 'scheme':81 'sentiment':152 'share':178 'simpli':121 'spars':221 'spec':244 'specif':64,186 'stripe':209 'stripe charges API' 'substant':238 'success':265,272 'suggest':204 'summar':155 'text':154 'token':164 'unit':93 'unknown':275 'upon':271 'usag':251 'usdc':19,38,57,95 'usdc-micropayment' 'util':13,32,170 'valid':130,172 'varieti':50 'via':18,37,77 'wallet':234 'web3':159 'x':125 'x-payment':124 'x402':2,21,43,79,131 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"c368f317-6c3c-4366-8c5d-3c67f25ee9eb","listingId":"7b978ced-f927-4eea-8f98-c0c4eeadcc9d","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/67","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:37.927Z"}],"sources":[{"listingId":"7b978ced-f927-4eea-8f98-c0c4eeadcc9d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/67","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:37.927Z","lastSeenAt":"2026-04-22T18:32:10.855Z"}],"details":{"listingId":"7b978ced-f927-4eea-8f98-c0c4eeadcc9d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/67 \\\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 402 challenge specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/67"},{"claim":"All listed endpoints are priced at $0.02 per 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":"Documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-request for API access without managing API keys or subscriptions","Integrating x402-compatible agents with low-cost utility endpoints","Accessing premium API functionality via on-chain USDC micropayments"],"bestFor":["Developers or agents already using x402 payment flows","Use cases requiring keyless, pay-as-you-go API access","Low-volume callers who want no minimum commitments"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume production workloads where $0.02/request adds up without bulk discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.858Z"},"updatedAt":"2026-04-22T18:32:10.855Z"}}