{"id":"48e92453-bfa4-4af4-8b83-7f974d66668e","shortId":"MBQRrj","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/181` is listed as \"Premium API Access\" and requires a maximum of 20,000 base units of USDC (0.02 USD) per call. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions are needed. The caller simply includes an X-PAYMENT header with a valid payment proof.\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 the same $0.02/request price point and settle to the same payTo address on Base.\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/181` path is unclear; the name \"Premium API Access\" and the path segment \"stripe/charges\" suggest it may relate to Stripe charge data, but this is speculative given the lack of documentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["api-marketplace","finance","ai"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-request API","USDC API access","Base network API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown.","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no usable content.","The endpoint path '/api/v1/stripe/charges/181' suggests Stripe charge data but the actual functionality is unverified.","The platform lists many endpoint categories (AI, finance, data, infrastructure) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/181","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/181","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) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the actual functionality of this specific endpoint is ambiguous. The listing is essentially a 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'/api/v1/stripe/charges/181':67,227 '/docs':188 '/pricing':190 '/readme':192 '/request':17,36,171 '0.02':16,35,85,170 '000':80 '20':79 'Base network API' 'USDC API access' 'access':73,235 'address':180 'advertis':125 'ai':10,29,137 'analysi':141 'analyt':131 'api':4,23,45,72,98,129,234 'avail':218 'base':7,26,61,81,182 'base-network' 'behind':53,225 'broader':123 'call':88 'caller':109 'categori':127 'charg':247 'classif':144 'connect':198 'content':204 'convers':161 'crawl':221 'data':9,28,130,134,248 'document':183,213,257 'embed':145 'endpoint':14,33,52,65,164 'estim':155 'exact':95 'exampl':217 'exchang':150 'export':135 'extrem':185 'feed':149 'financ':11,30,146 'four':126 'function':224 'gas':154 'gate':3,22,48 'generat':162 'geocod':159 'given':253 'header':116 'includ':111 'infrastructur':157 'insight':136 'key':99 'lack':255 'learn':139 'limit':102 'list':69,166 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':138 'made':91 'marketplac':46 'maximum':77 'may':243 'metric':132 'micropay':58 'micropayment API' 'name':232 'need':107 'network':62 'no-api-key' 'offer':8,27 'openapi':208 'page':193 'path':228,238 'pay-per-request API' 'payment':89,115,120 'payto':179 'per':55,87 'per-request':54 'per-request-billing' 'platform':5,24,124 'point':173 'post-endpoint' 'premium':71,233 'price':148,172 'prompt':200 'proof':121 'protocol':44 'quot':153 'rate':101,151 'relat':244 'render':195 'report':133 'request':56 'request/response':211 'requir':75 'schema':212 'scheme':96 'segment':239 'sentiment':140 'settl':175 'simpli':110 'spars':186 'spec':209 'specif':64,223 'specul':252 'stripe':246 'stripe/charges':240 'subscript':105 'suggest':241 'summar':143 'text':142 'token':152 'unclear':230 'unit':82 'usag':216 'usd':86 'usdc':19,38,57,84 'usdc-micropayment' 'util':13,32,158 'valid':119,160 'varieti':50 'via':18,37,92 'wallet':199 'web3':147 'x':114 'x-payment':113 'x402':2,21,43,94 'x402 API marketplace' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"0e31706d-9220-4f40-a672-d1e86081b1a4","listingId":"48e92453-bfa4-4af4-8b83-7f974d66668e","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/181","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:10.116Z"}],"sources":[{"listingId":"48e92453-bfa4-4af4-8b83-7f974d66668e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/181","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:10.116Z","lastSeenAt":"2026-04-22T15:01:53.136Z"}],"details":{"listingId":"48e92453-bfa4-4af4-8b83-7f974d66668e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/181 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/181"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/181"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls from autonomous agents using x402 protocol","Integrating pay-per-use endpoints into workflows that settle on Base via USDC"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 micropayments autonomously","Prototyping integrations without signing up for API key management"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-request crypto settlement adds latency","Anyone who needs to understand the exact request/response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.237Z"},"updatedAt":"2026-04-22T15:01:53.136Z"}}