{"id":"62bd65ff-9f6f-4806-85e1-db2e1c033de1","shortId":"S2vhdx","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 on the Base network. The specific endpoint `/api/v1/stripe/charges/21` is one of many offered by the provider, which 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).\n\nPayment is settled in USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) using the x402 \"exact\" scheme. The maximum amount required is 20,000 base units, which at 6 decimals equals $0.02 per request. The provider advertises no API keys, no rate limits, and instant access. The endpoint accepts HTTP POST and returns application/json.\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, and no examples available. The exact functionality behind the `/api/v1/stripe/charges/21` path is unclear; the name \"Premium API Access\" and the URL path suggest it may relate to Stripe charge creation or retrieval, but this cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","http-post","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","lowpaymentfee","Base network API","stripe charges API","crypto-paid API"],"warnings":["No OpenAPI spec or request/response schema available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","The specific functionality of /api/v1/stripe/charges/21 is unclear — the path suggests Stripe charge operations but this is unconfirmed","No examples of expected request body or response format"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/21","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/21","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 captured) and pricing is clear ($0.02/request in USDC on Base), but there is no documentation, no request/response schema, no examples, and the specific purpose of this endpoint path is ambiguous. Docs pages return only wallet-connect 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'/request':17,34 '0.02':16,33,130 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20':121 '6':127 'Base network API' 'USDC micropayment API' 'accept':147 'access':6,23,42,144,200 'advertis':135 'ai':77 'amount':118 'analysi':81 'analyt':76 'api':5,22,41,73,137,159,199 'application/json':152 'asset':109 'avail':186,221 'base':8,25,49,108,123 'base-network' 'behind':43,190 'broad':66 'call':12,29,72 'cannot':217 'catalog':67 'charg':211 'classif':83 'confirm':219 'connect':168 'content':174 'convers':100 'creation':212 'crypto-paid API' 'data':75 'decim':128 'doc':158 'document':153 'embed':84 'endpoint':36,53,146 'equal':129 'estim':94 'exact':114,188 'exampl':185 'exchang':89 'extrem':155 'feed':88 'financ':85 'function':189 'gas':93 'gate':3,20 'generat':101 'geocod':98 'host':64 'http':148 'http-post' 'infrastructur':96 'instant':143 'json-response' 'key':138 'learn':79 'limit':141 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':78 'mani':58 'materi':222 'maximum':117 'may':207 'name':197 'network':50 'offer':59 'one':56 'openapi':178 'page':163 'paid':9,26 'path':193,204 'pay':70 'pay-per-cal':69 'pay-per-call' 'pay-per-request API' 'payment':102 'paywal':46 'per':11,28,71,131 'per-cal':10,27 'post':149 'premium':4,21,40,198 'price':87,160 'prompt':170 'provid':39,62,134 'quot':92 'rate':90,140 'readm':162 'relat':208 'render':165 'request':132 'request/response':181 'requir':119 'retriev':214 'return':151 'schema':182 'scheme':115 'sentiment':80 'settl':104 'span':74 'spars':156 'spec':179 'specif':52 'stripe':210 'stripe charges API' 'suggest':205 'summar':82 'token':91 'unclear':195 'unit':124 'url':203 'usdc':14,31,106 'usdc-settlement' 'use':111 'util':97 'valid':99 'wallet':169 'web3':86 'x402':2,19,45,113 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"aaa6b522-cece-4650-b027-a5128ed1191a","listingId":"62bd65ff-9f6f-4806-85e1-db2e1c033de1","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/21","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:21.637Z"}],"sources":[{"listingId":"62bd65ff-9f6f-4806-85e1-db2e1c033de1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/21","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:21.637Z","lastSeenAt":"2026-04-23T00:32:07.546Z"}],"details":{"listingId":"62bd65ff-9f6f-4806-85e1-db2e1c033de1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/21 \\\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 challenge with x402Version 1, exact scheme, on Base network, with maxAmountRequired of 20000 base units in USDC","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/21"},{"claim":"The provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers APIs across data & analytics, AI & ML, 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/21"}],"useCases":["Making paid API calls without API key registration","Programmatic access to premium endpoints settled in USDC on Base","Agent-driven workflows that need instant, keyless API access"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents with Base USDC wallets needing on-demand endpoints","Prototyping integrations without committing to subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-call pricing may not be cost-effective","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:55.762Z"},"updatedAt":"2026-04-23T00:32:07.546Z"}}