{"id":"7c9b6c4a-3f06-4ef6-9f12-725406b5471c","shortId":"Xctht5","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request API endpoints gated by the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/charges/6` is labeled \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe broader platform lists 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 endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, the `/api/v1/charges/6` endpoint itself has no documentation explaining what it specifically returns or what input it expects beyond a POST request with JSON content type. The docs, pricing, and API pages on the site are effectively empty (showing only a \"Connect wallet\" prompt). Without schemas, example payloads, or response samples, the actual functionality behind this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-api","no-api-key","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["premium API","x402 endpoint","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet' with no content","The specific purpose and expected input/output of /api/v1/charges/6 is unknown","No OpenAPI spec or schema describing request/response formats","The site lists many endpoints but none have detailed documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/6","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example request/response payloads, and the site's docs/pricing/API pages are empty stubs. The specific functionality of /api/v1/charges/6 is completely 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'0.02':12,28,92,141 '000':82 '0x8335':70 '20':81 '2913':71 '6':87 'Base network API' 'USDC API' 'accept':65 'access':7,23,63 'across':100 'actual':208 'advertis':77 'ai':110 'analysi':114 'analyt':104 'api':6,22,42,62,146,186 'base':9,25,52,73,83 'base-network' 'behind':210 'beyond':174 'broader':96 'call':4,20 'categori':102 'challeng':76 'classif':117 'commit':154 'connect':197 'content':180 'contract':69 'convers':134 'data':103,107 'decim':88 'doc':183 'document':163 'effect':192 'embed':118 'empti':193 'endpoint':43,56,99,137,159,213 'equal':91 'estim':128 'exampl':202 'exchang':123 'expect':173 'explain':164 'export':108 'feed':122 'financ':119 'four':101 'function':209 'gas':127 'gate':44 'generat':135 'geocod':132 'howev':156 'infrastructur':130 'input':171 'insight':109 'json':179 'json-api' 'key':147 'label':60 'learn':112 'limit':150 'list':98 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':111 'maxamountrequir':79 'metric':105 'micropayment API' 'minimum':153 'network':53 'no-api-key' 'offer':34 'page':187 'particular':212 'pay':2,18,39 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':38 'payload':203 'payment':48,66 'per':3,13,19,29,40,93,142 'platform':97 'post':176 'post-method' 'premium':5,21,61 'premium API' 'price':121,139,184 'prompt':199 'protocol':49 'quot':126 'rate':124,149 'remain':214 'report':106 'request':14,30,41,94,143,177 'requir':155 'respons':205 'return':168 'sampl':206 'schema':201 'sentiment':113 'show':194 'site':190 'specif':55,167 'suit':36 'summar':116 'text':115 'token':125 'type':181 'unclear':215 'unit':84 'usdc':16,32,68,90 'usdc-settlement' 'util':131 'valid':133 'via':10,26 'wallet':198 'web3':120 'without':200 'x402':11,27,47,75 'x402 endpoint' 'x402-payment'","prices":[{"id":"f136506a-c816-423a-96fe-f764ba5cc157","listingId":"7c9b6c4a-3f06-4ef6-9f12-725406b5471c","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:40.446Z"}],"sources":[{"listingId":"7c9b6c4a-3f06-4ef6-9f12-725406b5471c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:40.446Z","lastSeenAt":"2026-04-23T21:32:04.489Z"}],"details":{"listingId":"7c9b6c4a-3f06-4ef6-9f12-725406b5471c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/charges/6","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/6"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/6"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-call 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","Applications requiring free or subscription-based access models","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.86Z"},"updatedAt":"2026-04-23T21:32:04.489Z"}}