{"id":"fd2f6b68-5181-4111-8a3b-10402fced59d","shortId":"vazxX8","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 is one of many x402-gated API endpoints offered by the provider. The specific path `/api/v1/payments/38` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. However, this specific listing covers only the `/api/v1/payments/38` path, whose exact functionality beyond \"Premium API Access\" is not documented.\n\nThe endpoint is live and returned a proper 402 challenge when probed. Documentation on the site is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material. The actual data or service returned by this particular endpoint after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI spec or request/response schema available","Actual functionality of /api/v1/payments/38 is undocumented — 'Premium API Access' is the only label","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no technical content","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/38","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/payments/38","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 network. However, there is no documentation, no OpenAPI spec, no request/response examples, and the actual functionality behind 'Premium API Access' at this specific path is undocumented. The site's docs pages are empty beyond a wallet-connect 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'/request':13,28 '0.02':12,27,86,157 '000':77 '20':76 '402':187 '6':82 'Base network API' 'USDC micropayment API' 'accept':58 'access':7,22,56,175 'across':117 'actual':235 'advertis':72 'ai':127 'analysi':131 'analyt':121 'api':6,21,42,55,90,174,200 'attach':99 'avail':229 'base':9,24,67,78 'base-network' 'beyond':172 'broader':112 'call':4,19 'caller':97 'categori':119 'challeng':71,188 'classif':134 'connect':209 'convers':150 'cover':164 'crawl':232 'crypto-paid API' 'data':120,124,236 'decim':83 'detail':216 'doc':199 'document':178,191 'embed':135 'endpoint':32,43,116,153,180,243 'equal':85 'estim':145 'exact':170 'exampl':228 'exchang':140 'export':125 'extrem':196 'feed':139 'financ':136 'four':118 'function':171 'gas':144 'gate':41 'generat':151 'geocod':148 'header':104 'howev':160 'infrastructur':147 'insight':126 'key':91 'label':53 'learn':129 'limit':94 'list':115,163 'live':182 'lowpaymentfee' 'lowpaymentfee.com':34,113 'machin':128 'mani':38 'materi':233 'maxamountrequir':74 'metric':122 'network':68 'no-api-key' 'offer':44 'one':36 'openapi':220 'page':204 'particular':242 'path':50,168 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':62,103,109,245 'per':3,18,87,158 'platform':114 'post':59 'premium':5,20,54,173 'premium API access' 'price':138,155,201 'probe':190 'prompt':211 'proof':110 'proper':186 'provid':47 'quot':143 'rate':93,141 'readm':203 'render':206 'report':123 'request':60,88,159 'request/response':223 'requir':96 'return':184,239 'schema':224 'sentiment':130 'servic':238 'settl':61 'simpli':98 'site':194 'spec':221 'specif':49,162 'summar':133 'technic':215 'text':132 'thin':197 'token':142 'unit':79 'unknown':247 'usag':227 'usdc':15,30,64,81 'usdc-settlement' 'valid':107,149 'via':10,25 'wallet':210 'web3':137 'whose':169 'x':102 'x-payment':101 'x402':11,26,40,70,108 'x402 API' 'x402-gated':39 'x402-payment'","prices":[{"id":"b6ba9c1c-687b-42d1-9302-53c475e2fb3f","listingId":"fd2f6b68-5181-4111-8a3b-10402fced59d","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/payments/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:44.666Z"}],"sources":[{"listingId":"fd2f6b68-5181-4111-8a3b-10402fced59d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:44.666Z","lastSeenAt":"2026-04-23T09:31:17.803Z"}],"details":{"listingId":"fd2f6b68-5181-4111-8a3b-10402fced59d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/38 \\\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 of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/38"},{"claim":"All 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"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/38"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access without subscription commitments or rate limits"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over traditional API key subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring non-crypto (fiat) payment methods","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.175Z"},"updatedAt":"2026-04-23T09:31:17.803Z"}}