{"id":"14a34942-98b6-48d8-85a4-f03fac9c0778","shortId":"XYRnTH","kind":"x402","title":"Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request API collection on Base via x402 — $0.02/call in USDC, no API keys required.","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/12` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe broader platform offers endpoints across four categories: 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled content. The endpoint at `/api/v1/collections/12` appears to be a collection-level resource, but its exact input parameters and response format are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","data"],"synonyms":["x402 API","micropayment API","USDC API","Base network API","pay-per-call","lowpaymentfee","premium API access"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/collections/12 is undocumented","Cannot verify what data or functionality is actually returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/12","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/12","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 with clear pricing ($0.02 USDC on Base). However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of the /collections/12 endpoint specifically is unclear beyond its generic 'Premium API Access' 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'/api/v1/collections/12':62,206 '/call':12,30 '/docs':167 '/pricing':169 '/readme':171 '0.02':11,29,99,148 '000':89 '0x8335':77 '20':88 '2913':78 '6':94 'Base network API' 'USDC API' 'accept':69 'access':48,67 'across':107 'advertis':84 'ai':117 'analysi':121 'analyt':111 'api':5,16,23,34,46,66,153 'appear':207 'avail':198 'base':8,26,56,80,90 'base-network' 'broader':103 'categori':109 'challeng':83 'classif':124 'collect':6,24,40,212 'collection-level':211 'commit':161 'connect':177 'content':202 'contract':76 'convers':141 'crawl':201 'data':110,114 'decim':95 'detail':184 'document':162,193 'embed':125 'endpoint':47,60,106,144,204 'equal':98 'estim':135 'exact':217 'exampl':197 'exchang':130 'export':115 'extrem':164 'feed':129 'financ':126 'format':222 'four':108 'gas':134 'generat':142 'geocod':139 'host':38 'infrastructur':137 'input':218 'insight':116 'key':17,35,154 'label':64 'learn':119 'level':213 'limit':157 'list':146 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':118 'maxamountrequir':86 'metric':112 'micropayment API' 'minimum':160 'network':57 'no-api-key' 'offer':105 'openapi':188 'page':172 'paramet':219 'pay':2,20,43 'pay-per-call' 'pay-per-request':1,19,42 'payment':52,73 'per':3,21,44,100,149 'platform':104 'post':70 'post-endpoint' 'premium':65 'premium API access' 'price':128 'prompt':179 'protocol':53 'quot':133 'rate':131,156 'render':174 'report':113 'request':4,22,45,71,101,150 'request/response':191 'requir':18,36 'resourc':214 'respons':221 'schema':192 'sentiment':120 'settl':72 'spars':165 'spec':189 'specif':59 'summar':123 'technic':183 'text':122 'token':132 'unit':91 'unknown':224 'usag':196 'usdc':14,32,75,97 'usdc-settlement' 'util':138 'valid':140 'via':9,27,49 'wallet':178 'web3':127 'x402':10,28,51,82 'x402 API' 'x402-payment'","prices":[{"id":"ca9eabfc-29e6-4c69-a42d-3230e7f76687","listingId":"14a34942-98b6-48d8-85a4-f03fac9c0778","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/12","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T22:29:50.726Z"}],"sources":[{"listingId":"14a34942-98b6-48d8-85a4-f03fac9c0778","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/12","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:50.726Z","lastSeenAt":"2026-04-22T09:01:57.533Z"}],"details":{"listingId":"14a34942-98b6-48d8-85a4-f03fac9c0778","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/12 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/12"},{"claim":"All endpoints are listed 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 offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/12"}],"useCases":["Accessing a bundled collection of API services with a single per-request USDC micropayment","Agent-driven API consumption without pre-registration or API key management","Programmatic access to data, AI, finance, or utility endpoints on a pay-as-you-go basis"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments on Base in USDC","Users who need low-cost micropayment API calls without rate limits"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet or x402 client","High-volume production workloads requiring well-documented, stable schemas"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.168Z"},"updatedAt":"2026-04-22T09:01:57.533Z"}}