{"id":"c34ab527-60bf-4029-b894-5ef8f2b57bc4","shortId":"T4VEGy","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. Every endpoint costs $0.02 per request, paid in USDC on the Base network via the x402 payment protocol. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof to each request.\n\nThe specific endpoint at `/api/v1/wire/15` is listed as \"Premium API Access.\" Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. However, the exact functionality behind this particular path (`/wire/15`) is not documented on the site — the landing page catalogs other endpoints (analytics, AI, finance, utils) but does not mention the `/wire/` namespace. It may be a generic or internal route.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages (docs, pricing, README) appear to require a wallet connection and returned no substantive content during crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","no-rate-limit","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","402 payment API"],"warnings":["The /api/v1/wire/15 path is not listed among the site's documented endpoints — its purpose is unclear","All documentation pages (docs, pricing, README) returned only 'Connect wallet' with no substantive content","No request or response schema is available for this endpoint","The broader platform lists many endpoint categories but none match the /wire/ namespace"],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/15","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific /wire/15 path has no documentation, no request/response schema, and no examples. The broader site's docs pages are wallet-gated and returned no content. The actual functionality behind this endpoint is 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'/request':13,30 '/wire':181 '/wire/15':159 '0.02':12,29,63,137,220 '000':126 '0x8335':131 '20':125 '2913':132 '402 payment API' '6':141 'Base network API' 'USDC micropayment API' 'accept':145 'access':117 'advertis':121,194 'ai':173 'ai/ml':53 'analysi':198 'analyt':52,172 'api':5,15,22,32,41,81,116 'appear':228 'application/json':150 'attach':92 'base':8,25,71,127,134 'behind':155 'broad':46 'broader':192 'call':4,21 'caller':90 'catalog':169 'challeng':120 'classif':201 'commit':89 'connect':233 'content':238 'convers':213 'cost':62 'crawl':240 'crypto-paid API' 'data':51,56 'decim':142 'doc':225 'document':162,223 'embed':202 'enabl':40 'endpoint':49,61,109,144,171,195 'equal':136 'estim':210 'everi':60 'exact':153 'exchang':205 'feed':204 'financ':174 'finance/web3':55 'function':154 'gas':209 'generat':215 'generic':187 'geocod':211 'given':138 'header':97 'howev':151 'infer':54 'infrastructur':58 'intern':189 'json-api' 'key':16,33,82 'land':167 'limit':85 'list':113 'lowpaymentfee' 'lowpaymentfee.com':35 'maxamountrequir':123 'may':184 'mention':179 'minimum':88 'namespac':182 'network':72 'no-api-key' 'no-rate-limit' 'offer':44 'page':168,224 'paid':66 'particular':157 'path':158 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payment':76,96,102 'per':3,20,64 'platform':6,23,42,193 'point':222 'post':146 'post-method' 'premium':115 'price':203,221,226 'proof':103 'protocol':77 'quot':208 'rate':84,206 'readm':227 'request':65,106,147 'requir':17,34,230 'return':149,235 'rout':190 'sentiment':197 'set':47 'simpli':91 'site':165 'span':50 'specif':108 'substant':237 'summar':200 'text':199 'token':207 'unit':128 'usdc':9,26,68,130,139 'usdc-base' 'util':59,175 'valid':100,212 'via':10,27,73 'wallet':232 'x':95 'x-payment':94 'x402':11,28,39,75,101,119 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"b1e8907f-785d-4e38-8819-5636883be07a","listingId":"c34ab527-60bf-4029-b894-5ef8f2b57bc4","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:44.142Z"}],"sources":[{"listingId":"c34ab527-60bf-4029-b894-5ef8f2b57bc4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:44.142Z","lastSeenAt":"2026-04-22T19:32:28.733Z"}],"details":{"listingId":"c34ab527-60bf-4029-b894-5ef8f2b57bc4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/15 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_proof>\" \\\n  -d '{}'","exampleRequest":{},"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 of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/15"},{"claim":"The site lists endpoints at $0.02/request across data analytics, AI/ML, finance, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand API access without managing API keys or subscriptions","Programmatic access to utility endpoints (geocoding, validation, conversion) with per-call crypto payment","AI agents consuming inference endpoints (sentiment, summarization, embeddings) via x402"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with USDC on Base that need frictionless endpoint consumption","Prototyping and low-volume use cases where $0.02/call is cost-effective"],"notFor":["High-volume production workloads where per-call pricing adds up quickly","Users without USDC on Base or unfamiliar with x402 payment protocol","Anyone needing detailed documentation — docs pages are currently empty or wallet-gated"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.348Z"},"updatedAt":"2026-04-22T19:32:28.733Z"}}