{"id":"9334c7e9-7719-4c66-b520-17471658c393","shortId":"eJ5LUT","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nThis specific endpoint (`/api/v1/stripe/charges/26`) is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge indicates payment in USDC (contract 0x8335…2913) on Base with a maxAmountRequired of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\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 description of what this particular endpoint actually returns. The endpoint name suggests it may relate to Stripe charge operations, but this is speculative. The site's landing page confirms the pricing model and general API categories but provides no technical detail about request formats or response payloads.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","x402 API","USDC pay-per-call","Base network API","micropayment API","stripe charges API","premium API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request or response formats","The endpoint path '/api/v1/stripe/charges/26' suggests Stripe charge functionality but this is unconfirmed","No examples of expected input or output are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/26","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/26","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and no explanation of what the endpoint actually does. The 'Premium API Access' label and '/stripe/charges/26' path are uninformative. This is effectively a stub 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'0.02':90,140 '000':135 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':156 '0x8335':126 '20':134 '2913':127 '300':159 '6':143 'Base network API' 'USDC pay-per-call' 'accept':115 'access':6,20,36,113 'actual':200 'address':155 'ai':60 'analysi':64 'analyt':59 'api':5,19,35,56,95,112,168,228 'base':8,22,43,129,136 'base-network' 'behind':37 'broad':49 'call':12,26,55 'catalog':50 'categori':229 'challeng':120 'charg':211 'classif':66 'commit':103 'confirm':222 'connect':177 'content':183 'contract':125 'convers':83 'data':58 'decim':144 'descript':194 'detail':234 'doc':167 'document':162 'embed':67 'endpoint':30,86,107,199,203 'equal':139 'estim':77 'exact':151 'exampl':191 'exchang':72 'extrem':164 'feed':71 'financ':68 'format':237 'gas':76 'gate':3,17 'general':227 'generat':84 'geocod':81 'host':47 'indic':121 'infrastructur':79 'key':96 'label':110 'land':220 'learn':62 'limit':99 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':61 'made':147 'maxamountrequir':132 'may':207 'micropayment API' 'minimum':102 'model':225 'name':204 'network':44 'no-api-key' 'openapi':187 'oper':212 'page':172,221 'paid':9,23 'particular':198 'pay':53 'pay-per-cal':52 'pay-per-call' 'payload':240 'payment':122,145 'paywal':40 'per':11,25,54,91 'per-cal':10,24 'post':116 'post-method' 'premium':4,18,34,111 'premium API' 'price':70,88,169,224 'prompt':179 'provid':33,231 'quot':75 'rate':73,98 'readm':171 'relat':208 'render':174 'request':92,117,236 'request/response':190 'requir':104 'respons':239 'return':201 'schema':188 'scheme':152 'second':160 'sentiment':63 'settl':153 'site':46,218 'span':57 'spars':165 'specif':106 'specul':216 'stripe':210 'stripe charges API' 'suggest':205 'summar':65 'technic':233 'timeout':161 'token':74 'unit':137 'usdc':14,28,124,141 'usdc-settlement' 'use':142 'util':80 'valid':82 'via':148 'wallet':178 'web3':69 'x402':2,16,39,119,150 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7793424b-5055-48b3-9ada-d732a0327220","listingId":"9334c7e9-7719-4c66-b520-17471658c393","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:22.251Z"}],"sources":[{"listingId":"9334c7e9-7719-4c66-b520-17471658c393","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:22.251Z","lastSeenAt":"2026-04-23T00:32:07.597Z"}],"details":{"listingId":"9334c7e9-7719-4c66-b520-17471658c393","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/26 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/26"},{"claim":"All 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 site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Programmatic access to a premium endpoint settled in USDC on Base","Agent-driven API consumption with on-chain micropayments"],"bestFor":["Developers wanting zero-friction, keyless API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-as-you-go pricing with no rate limits"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring guaranteed SLAs or enterprise support","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.617Z"},"updatedAt":"2026-04-23T00:32:07.597Z"}}