{"id":"b7f3bc96-aaa2-4aaf-8027-6928fd880adf","shortId":"75AnAb","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/196` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on-chain to a specified wallet address using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base). The maximum amount required per call is 20,000 base units of USDC, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted purely through the x402 payment header.\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.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The exact functionality of the `/api/v1/stripe/charges/196` endpoint is unclear beyond its title; it may relate to Stripe charge data or payment processing, but this is not confirmed by any documentation.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","on-chain-settlement"],"categories":["payments","api-marketplace"],"synonyms":["x402 API","micropayment API","pay-per-request API","USDC API access","Base network API","lowpaymentfee","stripe charges API","crypto-gated API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The exact functionality of /api/v1/stripe/charges/196 is undocumented and unclear","No request body schema or response format is documented anywhere","The platform lists many endpoint categories but none have visible technical documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/196","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/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /stripe/charges/196 endpoint is unexplained. This is effectively a stub 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'/api/v1/stripe/charges/196':69,229 '/docs':188 '/pricing':190 '/readme':192 '/request':17,36,181 '0.02':16,35,112,180 '000':105 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':94 '20':104 '6':115 'Base network API' 'USDC API access' 'accept':77 'access':49,75,125 'across':139 'address':90 'advertis':124 'ai':10,29,149 'amount':99 'analysi':153 'analyt':143 'api':4,23,45,74,118 'avail':219 'base':7,26,63,96,106 'base-network' 'behind':55 'beyond':233 'broader':135 'call':102 'categori':141 'chain':85 'charg':241 'classif':156 'confirm':250 'connect':198 'content':223 'contract':93 'convers':172 'crawl':222 'crypto-gated API' 'data':9,28,142,146,242 'decim':116 'detail':205 'document':183,214,253 'embed':157 'endpoint':14,33,54,67,138,176,230 'equal':111 'estim':167 'exact':225 'exampl':218 'exchang':162 'export':147 'extrem':185 'feed':161 'financ':11,30,158 'four':140 'function':226 'gas':166 'gate':3,22,48 'generat':173 'geocod':170 'grant':127 'header':133 'infrastructure/utilities':169 'insight':148 'key':119 'learn':151 'limit':122 'list':71,175 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':150 'marketplac':46 'maximum':98 'may':237 'metric':144 'micropay':60 'micropayment API' 'network':64 'no-api-key' 'offer':8,27,137 'on-chain':83 'on-chain-settlement' 'openapi':209 'page':193 'pay-per-request API' 'payment':80,132,244 'per':57,101 'per-request':56 'per-request-billing' 'platform':5,24,136 'post':78 'post-endpoint' 'premium':73 'price':160,182 'process':245 'prompt':200 'protocol':44 'pure':128 'quot':165 'rate':121,163 'relat':238 'render':195 'report':145 'request':58,79 'request/response':212 'requir':100 'schema':213 'sentiment':152 'settl':82 'share':177 'spars':186 'spec':210 'specif':66 'specifi':88 'stripe':240 'stripe charges API' 'summar':155 'technic':204 'text':154 'titl':235 'token':164 'unclear':232 'unit':107 'usag':217 'usdc':19,38,59,92,109,113 'usdc-micropayment' 'use':91,114 'util':13,32 'valid':171 'varieti':52 'via':18,37 'wallet':89,199 'web3':159 'x402':2,21,43,131 'x402 API' 'x402-gated':1,20 'x402-payment' 'x402-protocol':42","prices":[{"id":"0460f9ce-886e-4930-b920-aa2a2daf17b9","listingId":"b7f3bc96-aaa2-4aaf-8027-6928fd880adf","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/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:12.489Z"}],"sources":[{"listingId":"b7f3bc96-aaa2-4aaf-8027-6928fd880adf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/196","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:12.489Z","lastSeenAt":"2026-04-22T18:32:07.566Z"}],"details":{"listingId":"b7f3bc96-aaa2-4aaf-8027-6928fd880adf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/196 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/196"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/196"}],"useCases":["Accessing premium API data with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to Stripe charge data or payment-related information"],"bestFor":["Developers wanting no-signup, pay-per-call API access","AI agents with x402-compatible wallets on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.119Z"},"updatedAt":"2026-04-22T18:32:07.566Z"}}