{"id":"785607f8-6bfa-44a6-a7f9-f4fca5ad76c7","shortId":"4ugL6Q","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC with no API keys.","description":"lowpaymentfee.com is a platform offering a suite of pay-per-request API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/138` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, with a maximum amount of 20,000 base units — equivalent to $0.02 per call (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises endpoints 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 listed endpoints share the same $0.02/request pricing. However, the `/api/v1/charges/138` endpoint's description is simply \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation 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 spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what the endpoint actually does or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","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-gated API","402 payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /api/v1/charges/138","The endpoint description is generic ('Premium API Access') with no specifics on functionality","Cannot determine what data or service this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/138","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what the endpoint actually returns. The /docs and other pages are empty. This is effectively a stub 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'/api/v1/charges/138':64,177 '/docs':202 '/pricing':204 '/readme':206 '/request':173 '0.02':10,28,94,172 '000':89 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':80 '20':88 '402':243 '402 payment API' '6':99 'Base network API' 'USDC micropayment API' 'accept':71 'access':6,24,69,185 'across':130 'actual':258 'advertis':128 'ai':140 'amount':86 'analysi':144 'analyt':134 'api':5,17,23,35,49,68,102,184 'attach':113 'avail':231 'base':8,26,58,82,90 'base-network' 'broader':126 'call':96 'caller':111 'categori':132 'challeng':244 'classif':147 'commit':108 'confirm':238 'connect':212 'content':218 'contract':79 'convers':164 'crawl':234 'crypto-gated API' 'data':133,137,192 'decim':100 'descript':180 'difficult':252 'document':189,197,249 'embed':148 'endpoint':50,62,129,168,178,236,257 'equival':92 'estim':158 'exampl':230 'exchang':153 'expect':264 'export':138 'extrem':199 'feed':152 'financ':149 'four':131 'function':194 'gas':157 'gate':3,21,51 'generat':165 'geocod':162 'header':118 'howev':175 'infrastructur':160 'insight':139 'key':18,36,103 'know':254 'label':66 'lack':247 'learn':142 'limit':105 'list':167 'live':239 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':141 'make':250 'maximum':85 'metric':135 'network':59 'no-api-key' 'offer':41 'openapi':222 'page':207 'pay':9,27,46 'pay-per-call API' 'pay-per-request':45 'payment':74,117,123 'per':11,29,47,95 'platform':40,127 'post':72 'post-endpoint' 'premium':4,22,67,183 'price':151,174 'prompt':214 'proof':124 'proper':242 'protocol':55 'quot':156 'rate':104,154 'render':209 'report':136 'request':12,30,48,73 'request/response':225 'requir':110 'respons':262 'return':196,240 'schema':226 'sentiment':143 'settl':76 'share':169 'simpli':112,182 'spec':223 'specif':61 'substant':217 'suit':43 'summar':146 'text':145 'thin':200 'token':155 'unit':91 'upfront':107 'usag':229 'usdc':14,32,78,97 'usdc-settlement' 'use':98 'util':161 'valid':121,163 'wallet':213 'web3':150 'x':116 'x-payment':115 'x402':2,20,54,122 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"de2addc5-9e19-4980-b032-9612276a8ddb","listingId":"785607f8-6bfa-44a6-a7f9-f4fca5ad76c7","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/138","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:10.935Z"}],"sources":[{"listingId":"785607f8-6bfa-44a6-a7f9-f4fca5ad76c7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/138","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:10.935Z","lastSeenAt":"2026-04-24T06:32:01.220Z"}],"details":{"listingId":"785607f8-6bfa-44a6-a7f9-f4fca5ad76c7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/138 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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","source_url":"https://lowpaymentfee.com/api/v1/charges/138"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/138"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible wallet or USDC balance","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.154Z"},"updatedAt":"2026-04-24T06:32:01.220Z"}}