{"id":"eb90da2b-2a4d-495a-98a7-ef9593f0b89e","shortId":"JdZVgR","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. It is one of many endpoints on the platform, which offers a variety of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/stripe/charges/91` accepts POST requests and settles payments on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge confirms a maxAmountRequired of 20000 base units, which at 6 decimals equals $0.02 per call. Payment is made via the X-PAYMENT header using the x402 \"exact\" scheme.\n\nThe platform's landing page lists numerous sibling endpoints but provides minimal documentation on what each endpoint actually returns. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. As a result, the actual response payload and functionality of this specific endpoint (`/api/v1/stripe/charges/91`) remain unclear — the name \"Premium API Access\" and the path segment \"stripe/charges\" suggest it may relate to payment or charge processing, but this cannot be confirmed from available materials.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["payments","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-paid API","402 payment protocol"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The actual functionality and response schema of this specific endpoint are unknown","No OpenAPI spec or output schema beyond basic HTTP method info","The path 'stripe/charges/91' is ambiguous — unclear what resource ID 91 represents"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/91","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no schema for request/response bodies, and no explanation of what the endpoint actually does beyond the generic label \"Premium API Access\". The docs pages are 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'/request':16,34 '0.02':15,33,79,126 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':110 '20000':118 '402 payment protocol' '6':123 'Base network API' 'USDC micropayment endpoint' 'accept':97 'access':7,25,44,200 'actual':160,184 'ai':68 'analyt':67 'api':6,24,43,64,84,164,199 'avail':221 'base':9,27,105,119 'base-network' 'call':4,22,128 'cannot':217 'challeng':113 'charg':213 'commit':91 'confirm':114,219 'connect':173 'content':179 'contract':109 'crypto-paid API' 'data':66 'decim':124 'doc':163 'document':155 'endpoint':38,55,95,151,159,192 'equal':125 'exact':141 'financ':71 'function':188 'header':137 'infrastructur':74 'key':85 'land':146 'learn':70 'limit':88 'list':148 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':69 'made':131 'mani':54 'materi':222 'maxamountrequir':116 'may':208 'minim':154 'name':197 'network':10,28,106 'no-api-key' 'numer':149 'offer':60 'one':52 'page':147,168 'path':203 'pay':2,20 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request' 'payload':186 'payment':48,102,129,136,211 'per':3,21,80,127 'platform':58,144 'post':98 'post-method' 'premium':5,23,42,198 'price':77,165 'process':214 'prompt':175 'protocol':13,31,49 'provid':41,153 'rate':87 'readm':167 'relat':209 'remain':194 'render':170 'request':81,99 'requir':92 'respons':185 'result':182 'return':161 'scheme':142 'segment':204 'settl':101 'sibl':150 'span':65 'specif':94,191 'stripe/charges':205 'suggest':206 'unclear':195 'unit':120 'usdc':18,36,108 'usdc-settlement' 'use':107,138 'util':75 'varieti':62 'via':11,29,45,132 'wallet':174 'web3':72 'x':135 'x-payment':134 'x402':12,30,47,112,140 'x402 API' 'x402-payment'","prices":[{"id":"fe2a3cf8-5760-4de6-af52-6892dd9ebd35","listingId":"eb90da2b-2a4d-495a-98a7-ef9593f0b89e","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:36.109Z"}],"sources":[{"listingId":"eb90da2b-2a4d-495a-98a7-ef9593f0b89e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:36.109Z","lastSeenAt":"2026-04-22T21:31:26.468Z"}],"details":{"listingId":"eb90da2b-2a4d-495a-98a7-ef9593f0b89e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/91 \\\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 maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/91"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/91"}],"useCases":["Programmatic access to premium API functionality without traditional API key registration","Agent-driven workflows that need instant, keyless API access settled in USDC on Base","Demonstrating x402 payment protocol integration for pay-per-call services"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with Base network USDC wallets needing on-demand API calls","Projects exploring x402 protocol micropayments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 becomes expensive","Users without a Base network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:54.988Z"},"updatedAt":"2026-04-22T21:31:26.468Z"}}