{"id":"3c4f3f71-7157-4903-bd47-d03dd0251176","shortId":"xHphmw","kind":"x402","title":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/collections/20` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request. Payment is settled on-chain with no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises four categories of endpoints: 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The `/api/v1/collections/20` endpoint itself is live and returns a valid x402 402 challenge, confirming it accepts POST requests and pays out to address 0x1A2B…85F3. Without documentation, the actual request format and response structure for this or any other endpoint remain unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","data","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","Base USDC API","lowpaymentfee","crypto API access","on-chain API payment"],"warnings":["No API documentation available — docs, pricing, API, and README pages all render only 'Connect wallet'","No OpenAPI schema or request/response examples provided for any endpoint","The specific purpose and expected input/output of /api/v1/collections/20 is undocumented","The broad list of advertised endpoints (AI, finance, data, utils) cannot be verified for functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/20","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/20","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, documentation is effectively nonexistent — all doc pages show only 'Connect wallet' with no schema, examples, or endpoint descriptions. The purpose of the specific /collections/20 path is unclear beyond the generic 'Premium API Access' 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'/call':19,38 '/request':155 '0.02':18,37,86,154 '000':75 '0x1a2b':218 '0x8335':80 '20':74 '2913':81 '402':206 '85f3':219 'Base USDC API' 'accept':210 'access':50,69 'actual':223 'address':217 'advertis':109 'ai':12,31,121 'ai-inference' 'analysi':125 'analyt':115 'api':5,24,48,68,97,164 'base':8,27,58,76,83 'broader':107 'categori':111 'chain':94 'challeng':207 'charg':71 'classif':128 'collect':6,25,42 'confirm':208 'connect':173 'content':179 'convers':145 'crypto API access' 'data':11,30,114,118 'data-analytics' 'detail':190 'doc':163 'document':158,191,221 'embed':129 'endpoint':16,35,49,62,113,148,194,197,234 'equal':85 'estim':139 'exampl':187 'exchang':134 'export':119 'extrem':160 'feed':133 'financ':13,32,130 'finance-data' 'format':225 'four':110 'gas':138 'generat':146 'geocod':143 'host':40 'infrastructur':141 'insight':120 'key':98 'label':66 'learn':123 'limit':101 'list':150 'live':200 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':122 'metric':116 'micropayment API' 'network':59 'no-api-key' 'on-chain':92 'on-chain API payment' 'openapi':183 'page':168 'pay':2,21,45,214 'pay-per-call API' 'pay-per-request':1,20,44 'payment':54,89 'per':3,22,46,87 'platform':108 'point':157 'post':211 'post-endpoint' 'premium':67 'price':132,156,165 'prompt':175 'protocol':55 'quot':137 'rate':100,135 'readm':167 'remain':235 'render':170 'report':117 'request':4,23,47,88,212,224 'request/response':186 'requir':105 'respons':227 'return':202 'schema':184 'sentiment':124 'settl':91 'spars':161 'specif':61 'structur':228 'subscript':104 'summar':127 'text':126 'token':136 'unit':77 'unknown':236 'usdc':79 'usdc-base' 'util':15,34,142 'utility-services' 'valid':144,204 'via':9,28,51 'wallet':174 'web3':131 'without':220 'x402':10,29,53,205 'x402 API' 'x402-payment'","prices":[{"id":"e45a44dd-071f-479b-af20-45c0aa132bab","listingId":"3c4f3f71-7157-4903-bd47-d03dd0251176","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/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T00:59:36.448Z"}],"sources":[{"listingId":"3c4f3f71-7157-4903-bd47-d03dd0251176","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:59:36.448Z","lastSeenAt":"2026-04-22T09:01:57.850Z"}],"details":{"listingId":"3c4f3f71-7157-4903-bd47-d03dd0251176","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/20 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 USDC base units on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/20"},{"claim":"All endpoints are 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":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/collections/20"}],"useCases":["Accessing data analytics and reports without subscription commitments","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call basis","Fetching real-time crypto prices, gas estimates, and exchange rates","Performing utility operations like geocoding, validation, and data conversion"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","Agents that can settle x402 payments in USDC on Base","Use cases requiring low-cost, no-commitment API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume workloads where per-request pricing may add up compared to subscription plans","Users without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.823Z"},"updatedAt":"2026-04-22T09:01:57.850Z"}}