{"id":"466f6fe0-c19e-4b76-afb0-2c84ee860211","shortId":"UbZHCT","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-call 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/keys/96` is listed as \"Premium API Access\" and returns a 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 POST requests and returns `application/json`.\n\nBecause the endpoint path (`/keys/96`) does not clearly map to any of the named API categories on the landing page (analytics, AI, finance, utilities), its exact functionality is ambiguous. It may serve as a generic access-key provisioning or proxy endpoint. No OpenAPI schema, request/response examples, or detailed documentation were found beyond the landing page listing. Callers should experiment with POST payloads to discover the expected input format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The exact functionality of /api/v1/keys/96 is unclear — it does not map to any named API on the landing page","No example responses or error codes documented","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/96","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/keys/96","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, confirming pricing and payment details. However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page, and the specific purpose of /api/v1/keys/96 is unclear. This is effectively a stub 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'/keys/96':155 '/request':13,28 '0.02':12,27,70,130 '000':119 '0x8335':124 '20':118 '2913':125 '300':140 '402':113 '6':128 'Base network API' 'USDC micropayment API' 'accept':145 'access':7,22,38,109,187 'access-key':186 'ai':172 'ai/ml':59 'ambigu':179 'analyt':58,171 'api':6,21,37,55,81,108,165 'application/json':150 'attach':92 'base':9,24,78,120,127 'beyond':203 'broad':48 'call':4,19,54,132 'caller':90,208 'catalog':49 'categori':166 'challeng':114 'clear':158 'commit':87 'crypto-paid API' 'data':57,63 'decim':129 'detail':199 'discov':215 'document':200 'endpoint':32,102,144,153,192 'exact':137,176 'exampl':197 'expect':217 'experi':210 'financ':61,173 'format':219 'found':202 'function':177 'generic':185 'header':96 'host':46 'infer':60 'infrastructur':65 'input':218 'json-api' 'key':82,188 'land':169,205 'limit':84 'list':105,207 'lowpaymentfee' 'lowpaymentfee.com':34 'map':159 'may':181 'name':164 'network':79 'no-api-key' 'no-rate-limit' 'openapi':194 'page':170,206 'path':154 'pay':2,17,52 'pay-per-cal':1,16,51 'pay-per-call API' 'pay-per-request' 'payload':213 'payment':42,95,134 'per':3,18,53,71,131 'post':146,212 'premium':5,20,36,107 'premium API access' 'price':68 'protocol':43 'provid':35 'provis':189 'proxi':191 'rate':83 'request':72,99,115,147 'request/response':196 'requir':89 'return':111,149 'schema':195 'scheme':135 'second':141 'serv':182 'settl':73 'simpli':91 'site':45 'span':56 'specif':101 'timeout':142 'unit':121 'upfront':86 'usdc':15,30,75,123 'usdc-base' 'util':66,174 'via':10,25,39 'web3':62 'x402':11,26,41,94 'x402 API' 'x402-payment'","prices":[{"id":"6c7034d2-2be5-47c5-9d91-3d31b85a4367","listingId":"466f6fe0-c19e-4b76-afb0-2c84ee860211","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/keys/96","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.928Z"}],"sources":[{"listingId":"466f6fe0-c19e-4b76-afb0-2c84ee860211","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/96","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.928Z","lastSeenAt":"2026-04-22T01:02:19.379Z"}],"details":{"listingId":"466f6fe0-c19e-4b76-afb0-2c84ee860211","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/96 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/keys/96","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 endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base ($0.02) per call","source_url":"https://lowpaymentfee.com/api/v1/keys/96"},{"claim":"The site advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/96"}],"useCases":["Agent-driven API consumption without pre-registration or API keys","Micropayment-gated access to premium data or services","Programmatic pay-as-you-go API calls settled on Base L2"],"bestFor":["AI agents that need instant, keyless API access via x402","Developers exploring x402 payment protocol integrations","Low-volume or bursty workloads where per-call pricing beats subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up quickly","Users who need detailed API documentation or SLAs before integrating","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.985Z"},"updatedAt":"2026-04-22T01:02:19.379Z"}}