{"id":"6293aa70-694e-4041-a719-1dc300f182ca","shortId":"YMShuJ","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced at $0.02 per request settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/stripe/charges/147` is listed under the x402 challenge with a maxAmountRequired of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. It accepts POST requests and returns application/json. No API keys or rate limits are advertised — access is gated purely by the x402 payment header.\n\nDocumentation is extremely sparse. The site's /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no additional technical content. There is no OpenAPI spec, no request/response schema documentation, and no description of what this particular endpoint actually returns beyond the generic label \"Premium API Access.\" The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key"],"categories":["payments","api-gateway"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","crypto-gated API"],"warnings":["No documentation available — /docs, /pricing, /api, /README all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/stripe/charges/147 is completely undocumented","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/147","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/147","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 it actually does or returns. No OpenAPI spec, no request/response examples, and the docs pages are empty. The listing label 'Premium API Access' is generic and 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'/api/v1/stripe/charges/147':81 '/docs':136 '/pricing':137 '/readme':140 '/request':13,28 '0.02':12,27,68,104 '0x8335':97 '20000':92 '402':187 '6':100 'Base network API' 'USDC micropayment endpoint' 'accept':106 'access':7,22,38,120,179 'actual':171 'addit':151 'advertis':119 'ai/ml':58 'analyt':57 'api':6,21,37,54,113,178 'application/json':111 'base':9,24,76,93,99 'beyond':173 'call':4,19 'challeng':87,188 'collect':48 'connect':146 'content':153 'crypto-gated API' 'data':56,61,196 'decim':101 'descript':165 'document':129,162,191 'endpoint':32,80,170,181 'equal':103 'extrem':131 'finance/web3':60 'function':198 'gate':122 'generic':175 'header':128 'host':46 'infer':59 'infrastructur':63 'json-response' 'key':114 'label':176 'limit':117 'list':83 'live':183 'lowpaymentfee' 'lowpaymentfee.com':34 'maxamountrequir':90 'network':77 'no-api-key' 'openapi':157 'page':141 'particular':169 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'payment':42,127 'per':3,18,52,69 'post':107 'premium':5,20,36,177 'price':66 'prompt':148 'protocol':43 'provid':35,200 'pure':123 'rate':116 'render':143 'request':53,70,108 'request/response':160 'return':110,172,184 'schema':161 'settl':71 'site':45,134 'span':55 'spars':132 'spec':158 'specif':79 'technic':152 'unclear':194 'unit':94 'usdc':15,30,73,96 'usdc-base' 'util':64 'valid':186 'via':10,25,39 'wallet':147 'without':190 'x402':11,26,41,86,126 'x402 API' 'x402-payment'","prices":[{"id":"75e7bea4-c546-46a4-a1b6-24bbb95f9c90","listingId":"6293aa70-694e-4041-a719-1dc300f182ca","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/147","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:06.471Z"}],"sources":[{"listingId":"6293aa70-694e-4041-a719-1dc300f182ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/147","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:06.471Z","lastSeenAt":"2026-04-23T02:01:29.348Z"}],"details":{"listingId":"6293aa70-694e-4041-a719-1dc300f182ca","quickStartSnippet":"# Send a POST with x402 payment header to access the endpoint\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/147 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <your-x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge advertising USDC on Base, maxAmountRequired 20000 (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/147"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/147"}],"useCases":["Accessing premium API functionality without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to paid endpoints via x402 protocol"],"bestFor":["Developers who want keyless, pay-per-use API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Anyone without a Base-compatible USDC wallet","High-volume use cases where subscription pricing would be cheaper"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.353Z"},"updatedAt":"2026-04-23T02:01:29.348Z"}}