{"id":"d57d783e-8b1a-4683-b854-c53ff7d49365","shortId":"s75BEb","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, finance & Web3 data, and infrastructure utilities — all priced at $0.02 per request, 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/payments/336` is listed as \"Premium API Access\" and returns a valid 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals → $0.02) per call. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts HTTP POST and returns `application/json`.\n\nDocumentation on the site is extremely thin — 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 site's landing page groups its APIs into categories (analytics, AI, finance, utilities) but this endpoint's path (`/payments/336`) does not clearly map to any of those categories, making its actual functionality unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","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 documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet' with no content","No OpenAPI or schema definition found for this endpoint","The endpoint path /api/v1/payments/336 does not match any of the documented API categories on the landing page — actual functionality is unknown","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/336","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/336","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 with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind '/api/v1/payments/336' is entirely opaque — the name 'Premium API Access' is generic and the path doesn't correspond to any documented category. This is effectively a stub 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'/api/v1/payments/336':103 '/docs':160 '/payments/336':215 '/pricing':161 '/readme':164 '/request':13,28 '0.02':12,27,70,131 '000':120 '0x8335':125 '20':119 '2913':126 '300':141 '402':114 '6':129 'Base network API' 'USDC micropayment API' 'accept':146 'access':7,22,38,109 'actual':194,227 'ai':207 'ai/ml':59 'analyt':58,206 'api':6,21,37,55,81,108,203 'application/json':151 'attach':92 'base':9,24,78,121,128 'base-network' 'broad':48 'call':4,19,133 'caller':90 'catalog':49 'categori':205,224 'challeng':115 'clear':218 'commit':87 'connect':170 'content':176 'crypto-paid API' 'data':57,63 'decim':130 'document':152,185 'endpoint':32,102,145,193,212 'exact':138 'exampl':188 'extrem':157 'financ':61,208 'function':228 'group':201 'header':96 'host':46 'http':147 'infer':60 'infrastructur':65 'json-response' 'key':82 'land':199 'limit':84 'list':105 'lowpaymentfee' 'lowpaymentfee.com':34 'make':225 'map':219 'network':79 'no-api-key' 'openapi':180 'page':165,200 'particular':192 'path':214 'pay':2,17,52 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':51 'payment':42,95,135 'per':3,18,53,71,132 'post':148 'premium':5,20,36,107 'premium API access' 'price':68 'prompt':172 'protocol':43 'provid':35 'rate':83 'render':167 'request':54,72,99,116 'request/response':183 'requir':89 'return':111,150,195 'schema':184 'scheme':136 'second':142 'settl':73 'simpli':91 'site':45,155,197 'span':56 'spec':181 'specif':101 'thin':158 'timeout':143 'unclear':229 'unit':122 'upfront':86 'usdc':15,30,75,124 'usdc-settlement' 'util':66,209 'valid':113 'via':10,25,39 'wallet':171 'web3':62 'x402':11,26,41,94 'x402 API' 'x402-payment'","prices":[{"id":"f84b5300-3c38-456c-a48b-d22e771ec46d","listingId":"d57d783e-8b1a-4683-b854-c53ff7d49365","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/336","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:34.989Z"}],"sources":[{"listingId":"d57d783e-8b1a-4683-b854-c53ff7d49365","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/336","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:34.989Z","lastSeenAt":"2026-04-23T11:03:35.256Z"}],"details":{"listingId":"d57d783e-8b1a-4683-b854-c53ff7d49365","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/336 \\\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 up to 20,000 base units of USDC on Base ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/336"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/336"},{"claim":"All APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists APIs in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services without API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need keyless, per-request billing"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.697Z"},"updatedAt":"2026-04-23T11:03:35.256Z"}}