{"id":"4ff361e8-e066-4df3-ae93-e5efe2eb7d53","shortId":"VS2qXd","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 settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/collections/16` is labeled \"Premium API Access\" and accepts POST requests with payment of up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 listed endpoints are priced at $0.02 per request. The `/api/v1/collections/16` endpoint likely serves as a bundled or curated access point, though the exact response payload is undocumented.\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 material. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is difficult to know what data or functionality the response actually provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-marketplace","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No API documentation available — docs, pricing, API, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific functionality of /api/v1/collections/16 ('Premium API Access') is undocumented and unclear","No usage examples or sample responses available from crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/16","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/16","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 with a valid x402 402 challenge, and pricing is clear ($0.02 USDC per call). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The actual functionality behind 'Premium API Access' at /collections/16 is 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'/call':12,30 '0.02':11,29,85,164 '000':79 '20':78 '402':235 '6':91 'Base network API' 'USDC micropayment API' 'accept':70 'access':68,177 'actual':251 'advertis':120 'ai':132 'analysi':136 'analyt':126 'api':5,16,23,34,46,67,94,192 'attach':105 'avail':222 'base':8,26,55,80 'base-network' 'broader':118 'bundl':174 'call':87 'caller':103 'categori':122 'challeng':236 'classif':139 'collect':6,24,40 'commit':100 'confirm':230 'connect':201 'convers':156 'crawl':225 'crypto-paid API' 'curat':176 'data':125,129,246 'decim':92 'detail':208 'difficult':242 'doc':191 'document':186,217,239 'embed':140 'endpoint':47,61,124,160,169,228 'estim':150 'exact':181 'exampl':221 'exchang':145 'export':130 'extrem':188 'feed':144 'financ':141 'four':121 'function':248 'gas':149 'generat':157 'geocod':154 'header':110 'host':38 'i.e':84 'infrastructur':152 'insight':131 'key':17,35,95 'know':244 'label':65 'learn':134 'like':170 'limit':97 'list':159 'live':231 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':133 'materi':226 'metric':127 'network':56 'no-api-key' 'openapi':212 'page':196 'pay':2,20,43 'pay-per-call API' 'pay-per-request':1,19,42 'payload':183 'payment':74,109,115 'per':3,21,44,86,165 'platform':119 'point':178 'post':71 'post-endpoint' 'premium':66 'price':143,162,193 'prompt':203 'proof':116 'protocol':52 'provid':252 'quot':148 'rate':96,146 'readm':195 'render':198 'report':128 'request':4,22,45,72,166 'request/response':215 'requir':18,36,102 'respons':182,250 'return':232 'schema':216 'sentiment':135 'serv':171 'settl':48 'simpli':104 'sinc':88 'spars':189 'spec':213 'specif':60 'summar':138 'technic':207 'text':137 'though':179 'token':147 'undocu':185 'unit':81 'upfront':99 'usag':220 'usdc':14,32,58,83,89 'usdc-settlement' 'use':57,90 'util':153 'valid':113,155,234 'via':9,27,49 'wallet':202 'web3':142 'without':238 'x':108 'x-payment':107 'x402':10,28,51,114 'x402 API' 'x402-payment'","prices":[{"id":"98f786c6-9239-4272-9c11-39c115136464","listingId":"4ff361e8-e066-4df3-ae93-e5efe2eb7d53","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/16","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T22:29:49.511Z"}],"sources":[{"listingId":"4ff361e8-e066-4df3-ae93-e5efe2eb7d53","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/16","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T22:29:49.511Z","lastSeenAt":"2026-04-22T09:01:57.505Z"}],"details":{"listingId":"4ff361e8-e066-4df3-ae93-e5efe2eb7d53","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/16 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/16"},{"claim":"All listed 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":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/collections/16"}],"useCases":["Accessing bundled API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers who want zero-signup, pay-per-use API access","AI agents with x402-compatible wallets on Base","Projects needing low-cost micropayment-settled API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who prefer subscription or bulk pricing","Developers not set up for USDC payments on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:25.163Z"},"updatedAt":"2026-04-22T09:01:57.505Z"}}