{"id":"8ebc0d17-d057-4eb9-894d-abea459f5a45","shortId":"KQvNN8","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API marketplace that gates a collection of endpoints behind per-request USDC micropayments on the Base network. The specific endpoint `/api/v1/wire/199` is listed as \"Premium API Access\" and accepts payment via the x402 exact scheme. The maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request. No API keys or rate limits are advertised; 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 are listed at the same $0.02/request price point. However, the crawled documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, example payloads, or detailed descriptions of what each endpoint actually returns.\n\nBecause the endpoint is live (returns a well-formed 402 challenge) and the pricing is clear, it is functional for x402-capable agents. However, the complete lack of input/output schemas, example requests, or documentation beyond the landing page significantly limits usability. Agents would need to discover request formats through experimentation or out-of-band information.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","premium-api-access","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-request API","Base USDC API","wire 199"],"warnings":["No API documentation available — all doc/pricing/README pages return only 'Connect wallet'","No input or output schema provided for this endpoint","The specific purpose of /api/v1/wire/199 ('Premium API Access') is not explained anywhere","Cannot verify what data or functionality this endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/199","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/wire/199","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, there is zero documentation beyond the landing page listing—no input/output schemas, no example requests or responses, and all doc pages just show 'Connect wallet'. This is effectively a stub 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'/request':17,34,170 '0.02':16,33,97,169 '000':83 '0x8335':88 '20':82 '2913':89 '402':218 '6':94 'Base USDC API' 'accept':70 'access':68 'actual':206 'advertis':107,125 'agent':232,251 'ai':10,27,137 'amount':79 'analysi':141 'analyt':131 'api':4,21,41,67,101 'attach':110 'band':264 'base':7,24,57,84,91 'base-network' 'behind':49 'beyond':244 'broader':123 'caller':108 'capabl':231 'categori':127 'challeng':219 'classif':144 'clear':224 'collect':46 'complet':235 'connect':184 'content':190 'convers':161 'crawl':175 'data':9,26,130,134 'decim':95 'descript':201 'detail':200 'discov':255 'doc':178 'document':176,196,243 'embed':145 'endpoint':14,31,48,61,129,205,210 'equal':96 'estim':155 'exact':75 'exampl':197,240 'exchang':150 'experiment':259 'export':135 'feed':149 'financ':11,28,146 'form':217 'format':257 'four':126 'function':227 'gas':154 'gate':3,20,44 'generat':162 'geocod':159 'header':115 'howev':173,233 'inform':265 'infrastructur':157 'input/output':238 'insight':136 'json-response' 'key':102 'lack':236 'land':246 'learn':139 'limit':105,249 'list':64,165 'live':212 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':138 'marketplac':42 'maximum':78 'metric':132 'micropay':54 'micropayment API' 'need':253 'network':58 'no-api-key' 'offer':8,25 'out-of-band':261 'page':177,247 'pay-per-request API' 'payload':198 'payment':71,114,120 'per':51,98 'per-request':50 'per-request-billing' 'platform':5,22,124 'point':172 'premium':66 'premium-api-access' 'price':148,171,179,222 'prompt':186 'proof':121 'protocol':40 'quot':153 'rate':104,151 'readm':180 'report':133 'request':52,99,241,256 'requir':80 'return':181,207,213 'schema':195,239 'scheme':76 'sentiment':140 'signific':248 'simpli':109 'specif':60 'substant':189 'summar':143 'text':142 'token':152 'unit':85 'usabl':250 'usdc':53,87 'usdc-micropayment' 'util':13,30,158 'valid':118,160 'via':72 'wallet':185 'web3':147 'well':216 'well-form':215 'wire 199' 'would':252 'x':113 'x-payment':112 'x402':2,19,39,74,119,230 'x402 API' 'x402-capable':229 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"8375e666-0cbe-4921-97ba-f69d664bd854","listingId":"8ebc0d17-d057-4eb9-894d-abea459f5a45","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/wire/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:01.641Z"}],"sources":[{"listingId":"8ebc0d17-d057-4eb9-894d-abea459f5a45","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:01.641Z","lastSeenAt":"2026-04-22T13:32:00.264Z"}],"details":{"listingId":"8ebc0d17-d057-4eb9-894d-abea459f5a45","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/199 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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/wire/199"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/wire/199"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Micropayment-gated premium data or utility access for autonomous workflows","Testing x402 payment protocol integrations on Base network"],"bestFor":["x402-compatible agents that can sign USDC payments on Base","Developers exploring pay-per-call API models without subscriptions","Autonomous agents needing keyless, instant API access"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Agents that cannot settle payments on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:30.472Z"},"updatedAt":"2026-04-22T13:32:00.264Z"}}