{"id":"2ea10bc1-5962-451e-8004-5fa4b8257c89","shortId":"yBNaH8","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 collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/charges/216` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" 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, and no examples available. The actual functionality behind this particular charge ID (216) is unclear; it may be a generic gateway or a specific premium resource. Without documentation or sample payloads, callers will need to experiment to determine what data or service is returned after payment.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-gateway","pay-per-use"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","lowpaymentfee","Base network API","crypto API payment","402 payment required"],"warnings":["No API 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/216 ('Premium API Access') is not documented — unclear what data or service is returned after payment","No examples or sample payloads available anywhere on the site"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/216","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/216","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 pricing and payment details. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality behind 'Premium API Access' at charges/216 is undefined, making this effectively a stub 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'/request':13,28 '0.02':12,27,69,130 '000':119 '0x8335':124 '20':118 '216':196 '2913':125 '300':143 '402':113 '402 payment required' '6':134 'Base network API' 'USDC pay-per-call' 'accept':148 'access':7,22,38,109 'actual':189 'ai/ml':58 'analyt':57 'api':6,21,37,54,81,108,161 'application/json':153 'attach':92 'avail':187 'base':9,24,78,120,127 'base-network' 'behind':191 'call':4,19 'caller':90,215 'challeng':114 'charg':194 'collect':48 'commit':87 'connect':169 'content':175 'crypto API payment' 'data':56,62,223 'decim':135 'determin':221 'doc':159 'document':154,211 'endpoint':32,102,147 'equal':129 'exact':140 'exampl':186 'experi':219 'extrem':156 'financ':60 'function':190 'gateway':204 'generic':203 'given':131 'header':96 'host':46 'http':149 'http-post' 'id':195 'infer':59 'infrastructur':64 'json-response' 'key':82 'limit':84 'list':105 'lowpaymentfee' 'lowpaymentfee.com':34 'may':200 'micropayment API' 'need':217 'network':79 'no-api-key' 'openapi':179 'page':164 'particular':193 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-request':50 'payload':214 'payment':42,95,137,229 'per':3,18,52,70 'post':150 'premium':5,20,36,107,208 'price':67,160 'prompt':171 'protocol':43 'provid':35 'rate':83 'readm':163 'render':166 'request':53,71,99,115 'request/response':182 'requir':89 'resourc':209 'return':111,152,227 'sampl':213 'schema':183 'scheme':138 'second':144 'servic':225 'settl':73 'simpli':91 'site':45 'span':55 'spars':157 'spec':180 'specif':101,207 'timeout':145 'unclear':198 'unit':121 'upfront':86 'usdc':15,30,75,123,132 'usdc-settlement' 'util':65 'via':10,25,39 'wallet':170 'web3':61 'without':210 'x402':11,26,41,94 'x402 API' 'x402-payment'","prices":[{"id":"a0b883a1-eee3-40fd-af4c-04c17c9163fd","listingId":"2ea10bc1-5962-451e-8004-5fa4b8257c89","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/216","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:30.252Z"}],"sources":[{"listingId":"2ea10bc1-5962-451e-8004-5fa4b8257c89","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/216","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:30.252Z","lastSeenAt":"2026-04-24T04:03:33.330Z"}],"details":{"listingId":"2ea10bc1-5962-451e-8004-5fa4b8257c89","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/216 \\\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":"The endpoint returns a 402 challenge requesting 20,000 base units of USDC on Base (scheme: exact, 300s timeout)","source_url":"https://lowpaymentfee.com/api/v1/charges/216"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/216"},{"claim":"The site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API resources without signup or API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Programmatic access to data, AI, finance, or utility endpoints with per-request billing"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native billing without subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.197Z"},"updatedAt":"2026-04-24T04:03:33.330Z"}}