{"id":"b7168d4c-c3b4-4382-adcd-1f53685e3bcf","shortId":"MZgvpY","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 broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/charges/126` is labeled \"Premium API Access\" and returns a standard x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made via the x402 exact scheme, settling to a specified wallet address with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint actually returns. The landing page lists many API paths but provides no detail on request parameters or response formats. As a result, while the endpoint is confirmed live and the pricing is clear, the actual functionality behind `/api/v1/charges/126` is unknown beyond its label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api-gateway","misc"],"synonyms":["low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","premium API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/charges/126 ('Premium API Access') is undefined — it is unclear what data or service it provides","No examples of successful responses available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/126","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/126","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 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the actual functionality of /api/v1/charges/126 is entirely opaque. The docs pages are empty beyond a wallet connect 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'/api/v1/charges/126':112,244 '/docs':173 '/pricing':174 '/readme':177 '/request':13,28 '0.02':12,27,88,140 '000':129 '0x8335':134 '20':128 '2913':135 '300':157 'Base network API' 'USDC pay-per-call' 'accept':162 'access':7,22,38,117 'actual':207,241 'address':154 'ai/ml':59 'analysi':62 'analyt':58 'api':6,21,37,55,100,116,214 'application/json':167 'base':9,24,96,130,137 'behind':243 'beyond':247 'broad':48 'call':4,19 'catalog':49 'challeng':123 'classif':64 'clear':239 'commit':107 'confirm':233 'connect':183 'content':189 'convers':81 'data':57 'detail':219 'document':168,198 'embed':65 'endpoint':32,84,111,161,206,231 'equal':139 'estim':75 'exact':147 'exampl':201 'exchang':70 'extrem':170 'feed':69 'financ':66 'format':225 'function':242 'gas':74 'generat':82 'geocod':79 'host':46 'http':163 'http-post' 'infer':60 'infrastructur':77 'json-response' 'key':101 'label':114,249 'land':210 'limit':104 'list':212 'live':234 'low payment fee API' 'lowpaymentfee.com':34 'made':143 'mani':213 'maxamountrequir':126 'micropayment API' 'network':97 'openapi':193 'page':178,211 'paramet':222 'particular':205 'path':215 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-request':51 'payabl':91 'payment':42,141 'per':3,18,53,89 'post':164 'premium':5,20,36,115 'premium API access' 'price':68,86,237 'prompt':185 'protocol':43 'provid':35,217 'quot':73 'rate':71,103 'render':180 'request':54,90,221 'request/response':196 'requir':108 'respons':224 'result':228 'return':119,166,208 'schema':197 'scheme':148 'second':158 'sentiment':61 'settl':149 'site':45 'span':56 'spars':171 'spec':194 'specif':110 'specifi':152 'standard':121 'summar':63 'timeout':159 'token':72 'unit':131 'unknown':246 'usdc':15,30,93,133 'usdc-base' 'util':78 'valid':80 'via':10,25,39,144 'wallet':153,184 'web3':67 'x402':11,26,41,122,146 'x402 API' 'x402-payment'","prices":[{"id":"4fc64cc9-ff74-4a4c-8a49-e9629ba6d47a","listingId":"b7168d4c-c3b4-4382-adcd-1f53685e3bcf","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/126","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:11.553Z"}],"sources":[{"listingId":"b7168d4c-c3b4-4382-adcd-1f53685e3bcf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/126","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:11.553Z","lastSeenAt":"2026-04-22T09:00:59.257Z"}],"details":{"listingId":"b7168d4c-c3b4-4382-adcd-1f53685e3bcf","quickStartSnippet":"# 1. Send a POST to get the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/126\n# 2. Parse the 402 JSON for payment details\n# 3. Construct an X-PAYMENT header with a signed USDC payment on Base\n# 4. Resend the POST with the header to receive the JSON response","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, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/126"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/126"},{"claim":"Site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API services without API key management","Agent-driven pay-per-call workflows using x402 on Base","Accessing data, AI, finance, or utility endpoints with USDC micropayments"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing may add up","Anyone requiring fiat-only payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.073Z"},"updatedAt":"2026-04-22T09:00:59.257Z"}}