{"id":"5522450d-eb88-4088-9715-7da7ce5657a9","shortId":"PBBPz6","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/charges/237` is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live, accepting POST requests and settling payments in USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base). The max amount required is 20,000 base units, which at 6 decimals for USDC equals $0.02 per call. The payment timeout is 300 seconds. The response MIME type is `application/json`.\n\nHowever, the specific functionality behind `/api/v1/charges/237` is not documented — the title \"Premium API Access\" is generic and does not clarify what data or service this particular endpoint returns. The provider's docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical documentation, OpenAPI schema, or example requests/responses. The broader site lists many other endpoints (analytics, AI, finance, utilities) but this specific charge ID is not among them, making it unclear what it does beyond accepting payment and returning JSON.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api","payment"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/charges/237 is unknown — 'Premium API Access' is a generic label with no further documentation.","All documentation pages (docs, api, pricing, README) render only 'Connect wallet' with no technical content.","This charge ID does not appear in the provider's listed API catalog, so it may be a test or unlisted endpoint.","No OpenAPI spec, no example request/response, and no input schema are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/237","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/charges/237","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but the specific endpoint's functionality is undocumented. No OpenAPI schema, no example requests or responses, and the docs/pricing/API pages are empty beyond a wallet connect prompt. The charge ID 237 does not map to any listed endpoint on the 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'/call':13,28 '0.02':12,27,76,131 '000':121 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':112 '20':120 '300':138 '6':126 'Base network API' 'USDC micropayment endpoint' 'accept':103,226 'access':7,22,38,159 'ai':63,207 'among':217 'amount':117 'analyt':62,206 'api':6,21,37,88,158,180 'application/json':145 'base':9,24,84,114,122 'base-network' 'behind':150 'beyond':225 'broader':200 'call':133 'categori':59 'challeng':97 'charg':213 'clarifi':165 'commit':93 'confirm':98 'connect':186 'contract':111 'crypto-paid API' 'data':61,167 'decim':127 'doc':177 'document':154,193 'endpoint':32,52,72,100,172,205 'equal':130 'exampl':197 'financ':66,208 'function':149 'generic':161 'howev':146 'id':214 'includ':60 'infrastructur':69 'json':230 'json-response' 'key':89 'learn':65 'limit':91 'list':202 'live':102 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':64 'make':219 'mani':51,203 'max':116 'mime':142 'network':85 'no-api-key' 'offer':53 'one':49 'openapi':194 'page':181 'particular':171 'pay':2,17 'pay-per-call API' 'pay-per-request':1,16 'payabl':79 'payment':42,108,135,227 'per':3,18,77,132 'post':104 'premium':5,20,36,157 'premium API' 'price':74,178 'prompt':188 'protocol':43 'provid':35,56,175 'rate':90 'render':183 'request':4,19,78,105 'requests/responses':198 'requir':94,118 'resourc':46 'respons':141 'return':173,229 'schema':195 'second':139 'servic':169 'settl':107 'site':201 'span':58 'specif':45,148,212 'technic':192 'timeout':136 'titl':156 'type':143 'unclear':221 'unit':123 'usdc':15,30,81,110,129 'usdc-settlement' 'util':70,209 'via':10,25,39 'wallet':187 'web3':67 'x402':11,26,41,96 'x402 API' 'x402-payment'","prices":[{"id":"8677f42d-09b9-4a56-9a98-cc4796bae25f","listingId":"5522450d-eb88-4088-9715-7da7ce5657a9","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/charges/237","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:46.665Z"}],"sources":[{"listingId":"5522450d-eb88-4088-9715-7da7ce5657a9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/237","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:46.665Z","lastSeenAt":"2026-04-22T13:30:58.780Z"}],"details":{"listingId":"5522450d-eb88-4088-9715-7da7ce5657a9","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl (you need an x402-compatible client to generate the header):\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/237 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/237"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/237"},{"claim":"Provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without needing API keys or subscriptions","Agent-driven workflows that settle per-call payments in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integration","AI agents that need keyless, pay-per-use API access","Low-cost per-request API consumption on Base L2"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","High-volume use cases where $0.02/request adds up without bulk discounts","Anyone who needs to understand the exact response payload before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.428Z"},"updatedAt":"2026-04-22T13:30:58.780Z"}}