{"id":"6f13cde4-6fb5-4269-ad3f-4513b2f28473","shortId":"Td3PgS","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/wire/110` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com 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. However, the specific endpoint being listed here (`/api/v1/wire/110`) is labeled generically as \"Premium API Access\" and does not appear in the site's public API catalog, so its exact functionality is unclear.\n\nPayments settle on Base to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The endpoint accepts POST requests and returns `application/json`. Documentation pages on the site (docs, pricing, README) all resolve but show only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto API access"],"warnings":["The endpoint /api/v1/wire/110 is not listed in the site's public API catalog; its actual functionality is unknown.","All documentation pages (docs, pricing, README) return only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available — callers cannot know what to send or expect back.","The platform lists many endpoint categories (AI, finance, data, infrastructure) but none can be verified as functional from the crawl."],"endpointUrl":"https://lowpaymentfee.com/api/v1/wire/110","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/wire/110 is unknown — it doesn't appear in the site's public catalog. Documentation pages are empty (\"Connect wallet\" only), there is no OpenAPI spec, and no request/response schema is available. This is effectively a stub 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'/request':13,28 '0.02':12,27,78,159 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':201 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':204 '20':71 '402':66 '402 payment API' '6':82 'Base network API' 'USDC micropayment API' 'accept':46,207 'access':62,97,176 'across':118 'address':200 'advertis':88 'ai':128 'analysi':132 'analyt':122 'api':5,20,38,61,90,175,186 'appear':180 'application/json':212 'attach':100 'base':8,23,51,73,197 'broader':113 'call':4,19,85 'caller':98 'catalog':187 'categori':120 'challeng':67 'classif':135 'connect':227 'content':233 'convers':152 'crypto API access' 'data':121,125 'decim':83 'detail':235 'doc':218 'document':213 'embed':136 'endpoint':55,117,155,165,206 'estim':146 'exact':190 'exchang':141 'export':126 'feed':140 'financ':137 'four':119 'function':191 'gas':145 'generat':153 'generic':172 'geocod':150 'given':79 'header':105 'howev':162 'i.e':77 'infrastructur':148 'insight':127 'instant':96 'json-response' 'key':91 'label':171 'learn':130 'limit':94 'list':58,157,167 'lowpaymentfee' 'lowpaymentfee.com':31,114 'machin':129 'metric':123 'network':9,24,52 'no-api-key' 'offer':116 'page':214 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,104,110,194 'per':3,18,36,84,160 'platform':6,21,39,87,115 'post':208 'post-method' 'premium':60,174 'price':139,219 'prompt':229 'proof':111 'protocol':44 'public':185 'quot':144 'rate':93,142 'readm':220 'report':124 'request':37,68,161,209 'request/response':236 'resolv':222 'return':64,211 'schema':237 'sentiment':131 'settl':195 'show':224 'simpli':99 'site':183,217 'specif':54,164 'substant':232 'summar':134 'text':133 'token':143 'unavail':239 'unclear':193 'unit':74 'usdc':15,30,47,76,80,203 'usdc-base-network' 'use':41,202 'util':149 'valid':108,151 'via':10,25 'wallet':228 'web3':138 'x':103 'x-payment':102 'x402':11,26,43,109 'x402 API' 'x402-payment'","prices":[{"id":"bd47649d-0eee-41b8-8710-33b74532cee1","listingId":"6f13cde4-6fb5-4269-ad3f-4513b2f28473","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:33.121Z"}],"sources":[{"listingId":"6f13cde4-6fb5-4269-ad3f-4513b2f28473","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/wire/110","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:33.121Z","lastSeenAt":"2026-04-22T10:02:34.676Z"}],"details":{"listingId":"6f13cde4-6fb5-4269-ad3f-4513b2f28473","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/wire/110 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/110"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/wire/110"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to data or services without subscription commitments"],"bestFor":["Developers who want to pay per request without API key management","AI agents with x402-compatible wallets on Base","Low-volume or bursty usage patterns where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:31.957Z"},"updatedAt":"2026-04-22T10:02:34.676Z"}}