{"id":"11c99855-2458-4a7d-9cc3-919cb3dea883","shortId":"wmygwy","kind":"x402","title":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","tagline":"x402-gated API collection on Base — pay $0.02 per request in USDC, no keys required.","description":"lowpaymentfee.com hosts a suite of x402-protocol pay-per-call APIs spanning data analytics, AI/ML inference, finance/crypto market data, and general utilities. Every endpoint costs $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/collections/28` 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). It accepts POST requests and responds with `application/json`. The payment is sent to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the x402 \"exact\" scheme.\n\nDocumentation is extremely thin — the docs, pricing, API, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The site's landing page lists sibling endpoints across four categories (Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure) but provides no detail on what `/api/v1/collections/28` specifically returns or what input it expects. Without further documentation it is unclear whether this is a bundle/collection endpoint or a standalone resource.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-gateway","misc"],"synonyms":["lowpaymentfee","low payment fee API","x402 USDC API","Base network API","pay-per-call API","micropayment API","collections endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","All doc/pricing/README pages render only 'Connect wallet' with no content","The specific function of /api/v1/collections/28 is unclear — it may be a meta-collection or a standalone resource","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/28","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/collections/28","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 spec, no request/response schema, no examples, and all documentation pages are empty beyond a wallet-connect prompt. The purpose of '/collections/28' specifically is 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'0.02':9,25,60,123 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':138 '0x8335':117 '20':111 '2913':118 '402':106 '6':121 'Base network API' 'accept':125 'access':102 'across':188 'addit':164 'address':137 'ai':193 'ai/ml':49 'analyt':48,192 'api':4,20,45,73,101,151 'application/json':131 'attach':84 'avail':179 'base':7,23,68,113,120 'bundle/collection':223 'call':44 'caller':82 'categori':190 'challeng':107 'collect':5,21 'collections endpoint' 'commit':81 'connect':159 'content':165 'cost':59 'data':47,53,191 'decim':122 'detail':202 'doc':149 'document':144,174,215 'endpoint':58,94,187,224 'everi':57 'exact':142 'exampl':177 'expect':212 'extrem':146 'financ':196 'finance/crypto':51 'four':189 'gate':3,19 'general':55 'header':88 'host':34 'infer':50 'infrastructur':198 'input':210 'json-api' 'key':15,31,74 'land':183 'learn':195 'limit':77 'list':98,185 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':194 'market':52 'micropayment API' 'network':69 'no-api-key' 'openapi':169 'page':154,184 'pay':8,24,42 'pay-per-cal':41 'pay-per-call API' 'pay-per-request' 'payload':178 'payment':87,133 'per':10,26,43,61 'post':126 'post-method' 'premium':100 'price':150 'prompt':161 'protocol':40 'provid':200 'rate':76 'readm':153 'render':156 'request':11,27,62,91,108,127 'request/response':172 'requir':16,32 'resourc':228 'respond':129 'return':104,207 'schema':173 'scheme':143 'sent':135 'settl':63 'sibl':186 'simpli':83 'site':181 'span':46 'spec':170 'specif':93,206 'standalon':227 'subscript':80 'suit':36 'thin':147 'unclear':218 'unit':114 'usdc':13,29,65,116 'usdc-base' 'use':139 'util':56 'wallet':160 'web3':197 'whether':219 'without':213 'x402':2,18,39,86,141 'x402 USDC API' 'x402-gated':1,17 'x402-payment' 'x402-protocol':38","prices":[{"id":"1fdaf9b8-e406-4d9e-81ad-033fc0e66d03","listingId":"11c99855-2458-4a7d-9cc3-919cb3dea883","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/collections/28","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T22:29:46.480Z"}],"sources":[{"listingId":"11c99855-2458-4a7d-9cc3-919cb3dea883","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/28","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:46.480Z","lastSeenAt":"2026-04-22T04:02:20.366Z"}],"details":{"listingId":"11c99855-2458-4a7d-9cc3-919cb3dea883","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/28 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/collections/28"},{"claim":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, pricing, API, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a bundled API collection via a single x402 payment","Agent-driven workflows that need keyless, per-call billing on Base","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 protocol integrations","AI agents that need frictionless pay-per-use API access without credentials","Low-volume consumers who want no subscription overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-throughput production workloads requiring predictable latency and uptime guarantees","Anyone who cannot settle payments in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.399Z"},"updatedAt":"2026-04-22T04:02:20.366Z"}}