{"id":"20ca041c-8582-4af5-bc8b-0cf277b4ab11","shortId":"x59XTd","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC at $0.02/request.","tagline":"x402-gated premium API access on Base, paid per-call in USDC at $0.02/request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall, settling payments in USDC on the Base network. The specific endpoint path `/api/v1/stripe/charges/126` is not individually documented on the provider's site, but the site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment analysis, 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-per-request pricing model.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests, and requires payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) to wallet 0x1A2B…85F3. The scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are advertised — access is purely payment-gated.\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 examples for any endpoint. The specific purpose of the `/stripe/charges/126` path is unclear — it may relate to Stripe charge data or be an internal route identifier. Without documentation or sample responses, the actual payload returned by this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-method","json-response"],"categories":["api-gateway","payments"],"synonyms":["premium API","x402 API","USDC pay-per-call","Base network API","lowpaymentfee","stripe charges API","micropayment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The specific endpoint /api/v1/stripe/charges/126 is not listed among the provider's advertised APIs, making its purpose unclear","No request or response schema is documented; integration requires trial-and-error","No OpenAPI specification or machine-readable schema provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/126","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/126","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 challenge, but there is zero documentation on what this specific endpoint does, what inputs it expects, or what it returns. The docs pages are empty beyond a wallet-connect prompt. No OpenAPI spec or examples exist. The endpoint path suggests Stripe charge data but this is 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'/request':17,34 '/stripe/charges/126':219 '0.02':16,33,114,149 '000':138 '0x1a2b':152 '0x8335':143 '20':137 '2913':144 '300':160 '6':147 '85f3':153 'Base network API' 'USDC pay-per-call' 'accept':128 'access':6,23,42,171 'actual':242 'advertis':170 'ai/ml':85 'analysi':87 'analyt':84 'api':5,22,41,81,164,183 'base':8,25,53,139,146 'behind':43 'broad':74 'call':12,29,80 'cannot':248 'catalog':75 'challeng':122 'charg':228 'classif':89 'confirm':123,250 'connect':192 'content':198 'convers':106 'data':83,229 'decim':148 'doc':182 'document':63,177,207,237 'embed':90 'endpoint':36,57,110,125,213,247 'estim':100 'exact':157 'exampl':210 'exchang':95 'extrem':179 'feed':94 'financ':91 'gas':99 'gate':3,20,176 'generat':107 'geocod':104 'host':72 'identifi':235 'individu':62 'infrastructur':102 'intern':233 'json-response' 'key':165 'limit':168 'list':109 'live':127 'lowpaymentfee' 'lowpaymentfee.com':38 'may':224 'micropayment API' 'model':119 'network':54 'no-api-key' 'openapi':202 'page':187 'paid':9,26 'path':58,220 'pay':78 'pay-per-cal':77 'pay-per-call' 'payload':243 'payment':48,133,175 'payment-g':174 'paywal':46 'per':11,28,79,116 'per-cal':10,27 'per-request':115 'post':129 'post-method' 'premium':4,21,40 'premium API' 'price':93,118,184 'prompt':194 'provid':39,66 'pure':173 'purpos':216 'quot':98 'rate':96,167 'readm':186 'relat':225 'render':189 'request':117,130 'request/response':205 'requir':132 'respons':240 'return':244 'rout':234 'sampl':239 'schema':206 'scheme':155 'second':161 'sentiment':86 'settl':47 'share':111 'site':68,71 'span':82 'spars':180 'spec':203 'specif':56,215 'stripe':227 'stripe charges API' 'summar':88 'timeout':162 'token':97 'unclear':222 'unit':140 'usdc':14,31,50,142 'usdc-base' 'util':103 'valid':105 'wallet':151,193 'web3':92 'without':236 'x402':2,19,45,121 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"9c5d0948-5431-45fe-aeae-9003399aa9cd","listingId":"20ca041c-8582-4af5-bc8b-0cf277b4ab11","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:53:50.696Z"}],"sources":[{"listingId":"20ca041c-8582-4af5-bc8b-0cf277b4ab11","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/126","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:53:50.696Z","lastSeenAt":"2026-04-23T05:01:31.437Z"}],"details":{"listingId":"20ca041c-8582-4af5-bc8b-0cf277b4ab11","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/126 \\\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 site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requires up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, which equals $0.02","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/126"},{"claim":"The site lists API categories including Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Accessing premium data or services gated behind x402 payment challenges"],"bestFor":["Developers or agents wanting key-free, pay-as-you-go API access","Crypto-native applications that can settle USDC on Base","Low-volume or sporadic usage where $0.02/request is cost-effective"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:57.175Z"},"updatedAt":"2026-04-23T05:01:31.437Z"}}