{"id":"b226045e-dfc6-4656-aec2-8b14b116b490","shortId":"cCC2pq","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific resource at `/api/v1/charges/358` accepts POST requests and requires a per-call USDC payment of up to $0.02 (20,000 base units of USDC with 6 decimals). Payment is settled on-chain to a Base address using the USDC contract (0x8335…2913).\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-request APIs spanning 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 priced at $0.02 per request. The platform emphasizes no API keys, no rate limits, and instant access.\n\nHowever, the specific endpoint `/api/v1/charges/358` is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. Without an OpenAPI schema, example responses, or detailed documentation, the actual behavior of this endpoint is unclear. It may serve as a generic charge endpoint or a gateway to one of the listed services, but this cannot be confirmed from available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment endpoint"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/charges/358 is unknown; 'Premium API Access' is the only description provided.","No OpenAPI schema or example responses are available to confirm what this endpoint returns.","The broader platform lists many API categories but none map clearly to this specific charge endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/358","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/358","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 402 challenge, confirming it accepts USDC payments on Base. However, there is no OpenAPI schema, no example request/response, and the docs pages are empty beyond a wallet-connect prompt. The specific functionality behind '/api/v1/charges/358' is undocumented, making this effectively a stub 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'0.02':10,24,65,141 '000':67 '0x8335':89 '20':66 '2913':90 '402 payment endpoint' '6':73 'Base network API' 'USDC micropayment API' 'accept':51 'access':6,20,36,155,167 'actual':207 'addit':195 'address':84 'advertis':95 'ai':112 'analysi':116 'analyt':106 'api':5,19,35,103,148,166,182 'avail':237 'base':8,22,44,68,83 'behavior':208 'broader':92 'call':59 'cannot':233 'chain':80 'charg':220 'classif':119 'confirm':235 'connect':190 'content':196 'contract':88 'convers':136 'crypto-paid API' 'data':105,109,174 'decim':74 'detail':204 'doc':180 'document':171,205 'embed':120 'emphas':146 'endpoint':30,159,211,221 'estim':130 'exampl':201 'exchang':125 'export':110 'feed':124 'financ':121 'function':176 'gas':129 'gate':3,17 'gateway':224 'generat':137 'generic':219 'geocod':134 'howev':156 'infrastructur':132 'insight':111 'instant':154 'key':149 'label':162 'learn':114 'limit':152 'list':229 'lowpaymentfee' 'lowpaymentfee.com':32,93 'machin':113 'materi':238 'may':215 'metric':107 'network':45 'no-api-key' 'on-chain':78 'one':226 'openapi':199 'page':185 'pay':9,23,100 'pay-per-call API' 'pay-per-request':99 'payment':40,61,75 'per':11,25,58,101,142 'per-cal':57 'platform':94,145 'post':52 'post-endpoint' 'premium':4,18,34,165 'price':123,139,181 'prompt':192 'protocol':41 'provid':33 'quot':128 'rate':126,151 'readm':184 'render':187 'report':108 'request':12,26,53,102,143 'requir':55 'resourc':48 'respons':202 'return':178 'schema':200 'sentiment':115 'serv':216 'servic':230 'settl':77 'span':104 'specif':47,158 'suit':97 'summar':118 'text':117 'token':127 'unclear':213 'unit':69 'usdc':14,28,60,71,87 'usdc-base' 'use':85 'util':133 'valid':135 'via':37 'wallet':191 'web3':122 'without':197 'x402':2,16,39 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"15f6225e-f4b0-49bf-af4d-1cda670c4a6a","listingId":"b226045e-dfc6-4656-aec2-8b14b116b490","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/358","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:12.098Z"}],"sources":[{"listingId":"b226045e-dfc6-4656-aec2-8b14b116b490","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/358","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:12.098Z","lastSeenAt":"2026-04-24T00:31:57.271Z"}],"details":{"listingId":"b226045e-dfc6-4656-aec2-8b14b116b490","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/358 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge requiring USDC payment of up to 20,000 base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/358"},{"claim":"The platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is used for payment on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/358"},{"claim":"The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API resource without traditional API keys or subscriptions","Agent-driven workflows that need to pay per request using on-chain USDC on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can settle USDC payments on Base for per-call access","Users who want pay-as-you-go API access without signup or rate limits"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Applications requiring free or subscription-based API access","Users without a Base-compatible wallet holding USDC"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.275Z"},"updatedAt":"2026-04-24T00:31:57.271Z"}}