{"id":"e913a3a6-8492-4407-ac86-e45e6ffb3299","shortId":"RRBbVL","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/149` 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 made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\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 per request price point.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The specific purpose of the `/api/v1/stripe/charges/149` endpoint is unclear beyond its generic \"Premium API Access\" label; the path suggests it may relate to Stripe charge data or processing, but this is speculative. The endpoint is live and returns a valid x402 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-marketplace","finance","llm","geo"],"synonyms":["low payment fee","micropayment API","x402 API","pay-per-call API","USDC API","Base network API","stripe charges API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or JSON schema provided for any endpoint","The specific function of /api/v1/stripe/charges/149 is unclear; 'Premium API Access' is a generic label","No request or response examples available anywhere on the site","Cannot verify what data or functionality any endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/149","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation, no OpenAPI schema, no request/response examples, and the specific purpose of this endpoint is unclear. The docs pages are all empty wallet-connect 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'/request':17,34 '0.02':16,33,77,155 '000':81 '20':80 '402':238 '6':87 'Base network API' 'USDC API' 'access':44,72,211 'advertis':110 'ai':10,27,122 'ai-inference' 'analysi':126 'analyt':116 'api':4,21,40,71,98,114,166,210 'base':7,24,60,82 'behind':50 'beyond':206 'broader':108 'call':79 'categori':112 'challeng':239 'charg':221 'classif':129 'classification' 'connect':175 'content':181 'convers':146 'cost':74 'data':9,26,115,119,222 'data-analytics' 'decim':88 'detail':192 'doc':165 'document':160,193 'embed':130 'embeddings' 'endpoint':14,31,49,64,149,196,203,230 'estim':140 'exact':95 'exampl':189 'exchang':135 'export':120 'extrem':162 'feed':134 'financ':11,28,131 'finance-data' 'four':111 'gas':139 'gate':3,20,43 'generat':147 'generic':208 'geocod':144 'geocoding' 'infrastructur':142 'insight':121 'key':99 'label':212 'learn':124 'limit':102 'list':68,151 'live':232 'low payment fee' 'lowpaymentfee.com':35 'machin':123 'made':91 'marketplac':41 'may':217 'metric':117 'micropay':54 'micropayment API' 'network':61 'offer':8,25 'openapi':185 'page':170 'path':214 'pay-per-call API' 'payment':89 'per':52,78,156 'per-request':51 'per-request-micropayment' 'platform':5,22,109 'point':159 'premium':70,209 'price':133,158,167 'process':224 'prompt':177 'protocol':39 'purpos':199 'quot':138 'rate':101,136 'readm':169 'relat':218 'render':172 'report':118 'request':53,157 'request/response':188 'requir':106 'return':234 'schema':186 'scheme':96 'sentiment':125 'sentiment-analysis' 'settl':55 'spars':163 'specif':63,198 'specul':228 'stripe':220 'stripe charges API' 'subscript':105 'suggest':215 'summar':128 'text':127 'text-summarization' 'token':137 'unclear':205 'unit':83 'usdc':57,85 'usdc-base' 'util':13,30,143 'utility-apis' 'valid':145,236 'varieti':47 'via':92 'wallet':176 'web3':132 'x402':2,19,38,94,237 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f58245c2-bbd3-4bdc-93de-293dccf76d4e","listingId":"e913a3a6-8492-4407-ac86-e45e6ffb3299","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/149","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:03.452Z"}],"sources":[{"listingId":"e913a3a6-8492-4407-ac86-e45e6ffb3299","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/149","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:03.452Z","lastSeenAt":"2026-04-22T20:01:24.579Z"}],"details":{"listingId":"e913a3a6-8492-4407-ac86-e45e6ffb3299","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/149 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/149"},{"claim":"All listed APIs 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 in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/149"}],"useCases":["Accessing data analytics and reports without API key management","Running AI inference tasks (sentiment, summarization, classification) on a pay-per-call basis","Fetching real-time financial data like exchange rates, token quotes, and gas estimates","Geocoding and data conversion utilities with no subscription commitment"],"bestFor":["Developers who want zero-commitment, pay-per-request API access","AI agents that can settle x402 micropayments autonomously on Base","Projects needing quick access to diverse utility endpoints without onboarding"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.568Z"},"updatedAt":"2026-04-22T20:01:24.579Z"}}