{"id":"9b0abb62-32cb-4e83-9e90-93cdbaad0e1e","shortId":"eCTkQ4","kind":"x402","title":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","tagline":"Pay-per-call API access on Base via x402 — $0.02/request in USDC, no keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network. The x402 protocol means there are no API keys, no sign-ups, and no rate limits — callers simply attach a payment header to each request.\n\nThe specific endpoint at `/api/v1/keys/59` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is settled on-chain to a specified wallet address using the USDC contract on Base (0x8335…2913). The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 per-request price point. However, the crawled documentation is extremely thin: the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further detail. There is no OpenAPI schema, no request/response examples, and no documentation describing what inputs each endpoint expects or what outputs it returns. The actual functionality behind this specific endpoint (keys/59) is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["No OpenAPI schema or endpoint documentation available","The specific functionality of /api/v1/keys/59 ('Premium API Access') is undocumented and unclear","All documentation pages (/api, /pricing, /README) returned only 'Connect wallet' with no content","No request or response examples could be found or inferred"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/59","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/59","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 it accepts payments. However, there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the /api, /pricing, and /README pages are all blank beyond a wallet-connect prompt. The purpose of the specific '/api/v1/keys/59' endpoint is entirely unclear. This is effectively a stub 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'/api/v1/keys/59':106 '/pricing':204 '/readme':206 '/request':12,29 '0.02':11,28,66,117,131,189 '000':123 '0x8335':149 '20':122 '2913':150 '6':129 'Base network API' 'USDC API access' 'accept':153 'access':6,23,112 'across':49 'actual':242 'address':142 'advertis':162 'ai':52 'analysi':166 'analyt':51 'api':5,22,41,83,111 'application/json':158 'attach':95 'avail':253 'base':8,25,74,124,148 'behind':244 'broader':160 'call':4,21,119 'caller':93 'categori':60 'chain':137 'classif':169 'connect':212 'contract':146 'convers':181 'cost':114 'crawl':197 'data':50,183 'decim':130 'describ':230 'detail':218 'document':198,229 'embed':170 'enabl':40 'endpoint':48,62,104,152,163,234,247 'estim':178 'exampl':226 'exchang':173 'expect':235 'extrem':200 'feed':172 'financ':55 'function':243 'gas':177 'generat':184 'geocod':179 'header':98 'howev':195 'infrastructur':58 'input':232 'json-response' 'key':16,33,84 'keys/59':248 'learn':54 'limit':92 'list':108 'lowpaymentfee' 'lowpaymentfee.com':35 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'x402-payment'","prices":[{"id":"febfe4cf-c387-4b14-8a6c-43262f418b2e","listingId":"9b0abb62-32cb-4e83-9e90-93cdbaad0e1e","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.652Z"}],"sources":[{"listingId":"9b0abb62-32cb-4e83-9e90-93cdbaad0e1e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.652Z","lastSeenAt":"2026-04-22T01:02:19.018Z"}],"details":{"listingId":"9b0abb62-32cb-4e83-9e90-93cdbaad0e1e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/59 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02, paid on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/59"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/keys/59"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without sign-up or API key management","Making micropayment-gated API calls settled in USDC on Base","Agent-driven workflows that need on-demand paid API access without subscriptions"],"bestFor":["Developers wanting zero-friction, keyless API access","AI agents that can attach x402 payment headers automatically","Users who prefer pay-per-use over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume callers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.395Z"},"updatedAt":"2026-04-22T01:02:19.018Z"}}