{"id":"c12beb0e-c717-4158-914f-52aa6fa2ba1d","shortId":"zEZHG6","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 broad collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/collections/42` 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 provider's landing page lists 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 are priced at $0.02 per request. The platform advertises no API keys, no rate limits, no minimums, and instant access.\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/42` path does not appear in the listed endpoints on the homepage, so its exact functionality is unclear — it may be a meta-collection endpoint or an unlisted resource. The endpoint is confirmed live (402 challenge returned successfully).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-marketplace","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","The endpoint path /api/v1/collections/42 does not appear in the provider's listed API catalog; its exact functionality is unknown","No OpenAPI schema or request/response examples are provided","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/42","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, no meaningful documentation (all doc pages show only 'Connect wallet'), and the specific /api/v1/collections/42 path is not described anywhere on the site. This is effectively a stub 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'/api/v1/collections/42':63,205 '/call':12,30 '/docs':172 '/pricing':174 '/readme':176 '0.02':11,29,100,150 '000':90 '0x8335':78 '20':89 '2913':79 '402':240 '6':95 'Base network API' 'USDC micropayment API' 'accept':70 'access':49,68,166 'advertis':85,155 'ai':120 'analysi':124 'analyt':114 'api':5,16,23,34,47,67,157 'appear':209 'base':8,26,57,81,91 'base-network' 'broad':40 'categori':110 'challeng':84,241 'classif':127 'collect':6,24,41,229 'confirm':238 'connect':182 'content':188 'contract':77 'convers':144 'crypto-paid API' 'data':113,117 'decim':96 'detail':199 'document':167,200 'embed':128 'endpoint':48,61,112,203,213,230,236 'equal':99 'estim':138 'exact':219 'exampl':196 'exchang':133 'export':118 'extrem':169 'feed':132 'financ':129 'four':109 'function':220 'gas':137 'generat':145 'geocod':142 'homepag':216 'host':38 'infrastructur':140 'insight':119 'instant':165 'json-response' 'key':17,35,158 'label':65 'land':106 'learn':122 'limit':161 'list':108,212 'live':239 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':121 'maxamountrequir':87 'may':224 'meta':228 'meta-collect':227 'metric':115 'minimum':163 'network':58 'no-api-key' 'openapi':192 'page':107,177 'path':206 'pay':2,20,44 'pay-per-call API' 'pay-per-request':1,19,43 'payment':53,74 'per':3,21,45,101,151 'platform':154 'post':71 'post-method' 'premium':66 'premium API access' 'price':131,148 'prompt':184 'protocol':54 'provid':104 'quot':136 'rate':134,160 'render':179 'report':116 'request':4,22,46,72,102,152 'request/response':195 'requir':18,36 'resourc':234 'return':242 'schema':193 'sentiment':123 'settl':73 'spars':170 'specif':60 'success':243 'summar':126 'text':125 'token':135 'unclear':222 'unit':92 'unlist':233 'usdc':14,32,76,98 'usdc-settlement' 'util':141 'valid':143 'via':9,27,50 'wallet':183 'web3':130 'x402':10,28,52,83 'x402 API' 'x402-payment'","prices":[{"id":"88917329-7cec-44c8-8f7c-016417e597fe","listingId":"c12beb0e-c717-4158-914f-52aa6fa2ba1d","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T05:29:55.806Z"}],"sources":[{"listingId":"c12beb0e-c717-4158-914f-52aa6fa2ba1d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T05:29:55.806Z","lastSeenAt":"2026-04-22T07:32:06.726Z"}],"details":{"listingId":"c12beb0e-c717-4158-914f-52aa6fa2ba1d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/42 \\\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 returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/42"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/42"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics or AI inference endpoints without traditional API key registration","Making one-off API calls with per-request USDC micropayments on Base","Integrating crypto-native pay-as-you-go APIs into agent workflows"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription-based pricing over per-call fees","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.304Z"},"updatedAt":"2026-04-22T07:32:06.726Z"}}