{"id":"87d7efd1-835d-4e46-96e4-c2b2e998302b","shortId":"mKDKFd","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 specific resource `/api/v1/charges/213` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform advertises a suite of APIs across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/charges/213`) is labeled only as \"Premium API Access\" without further detail on what data or functionality it returns.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with version 1 of the protocol. The payment timeout is 300 seconds. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the endpoint actually returns beyond its generic title.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/charges/213 is unclear; 'Premium API Access' is a generic label","No OpenAPI schema or request/response examples are provided","No information on what data or service is returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/213","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/213","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 no documentation, no OpenAPI schema, no request/response examples, and the endpoint's actual functionality beyond 'Premium API Access' is unknown. The docs pages are empty stubs. This is effectively a stub 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'/request':13,28 '0.02':12,27,69,144 '000':56 '0x8335':61 '1':186 '20':55 '2913':62 '300':194 '402':183 '6':74 'Base network API' 'USDC micropayment API' 'accept':48 'access':7,22,38,161 'across':103 'actual':236 'advertis':98 'ai':113 'analysi':117 'analyt':107 'api':6,21,37,88,102,160,205 'base':9,24,57,65 'beyond':238 'broader':95 'call':4,19 'categori':105 'challeng':181 'charg':52 'classif':120 'connect':214 'content':220 'convers':137 'crypto-paid API' 'data':106,110,167 'decim':75 'descript':231 'detail':164 'doc':204 'document':196 'embed':121 'endpoint':32,140,150,173,235 'equal':68 'estim':131 'exampl':228 'exchang':126 'export':111 'extrem':201 'feed':125 'financ':122 'four':104 'function':169 'gas':130 'generat':138 'generic':240 'geocod':135 'handl':78 'header':85 'howev':147 'http':182 'infrastructur':133 'inlin':79 'insight':112 'key':89 'label':156 'learn':115 'limit':92 'list':142,152 'live':175 'lowpaymentfee' 'lowpaymentfee.com':34,96 'machin':114 'metric':108 'network':66 'no-api-key' 'openapi':224 'page':209 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,76,84,191 'per':3,18,70,145 'platform':97 'post':49 'post-endpoint' 'premium':5,20,36,159 'price':124,206 'prompt':216 'protocol':43,189 'provid':35 'quot':129 'rate':91,127 'readm':208 'render':211 'report':109 'request':50,71,146 'request/response':227 'requir':93 'resourc':46 'return':171,177,237 'schema':225 'second':195 'sentiment':116 'site':199 'specif':45,149 'substant':219 'suit':100 'summar':119 'text':118 'thin':202 'timeout':192 'titl':241 'token':128 'unit':58 'usdc':15,30,60,72 'usdc-base' 'use':73 'util':134 'valid':136,179 'version':185 'via':10,25,39,80 'wallet':215 'web3':123 'without':162 'x':83 'x-payment':82 'x402':11,26,41,180 'x402 API' 'x402-payment'","prices":[{"id":"b8e57cb6-b2b7-4a22-8014-916c28715573","listingId":"87d7efd1-835d-4e46-96e4-c2b2e998302b","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/213","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:35.716Z"}],"sources":[{"listingId":"87d7efd1-835d-4e46-96e4-c2b2e998302b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/213","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:35.716Z","lastSeenAt":"2026-04-24T04:03:33.583Z"}],"details":{"listingId":"87d7efd1-835d-4e46-96e4-c2b2e998302b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/213 \\\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":"Endpoint returns HTTP 402 with x402 version 1 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/213"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/213"},{"claim":"Platform lists APIs at $0.02/request across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Site advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request API consumption settled on Base"],"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 needing clarity on exactly what data the endpoint returns"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.891Z"},"updatedAt":"2026-04-24T04:03:33.583Z"}}