{"id":"9fced640-faa7-4c41-ac66-f8eb1e4f818e","shortId":"b8jbsG","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.","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/inbox/112` is listed as \"Premium API Access\" and costs $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader platform advertises multiple API categories including 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 the same $0.02 per request price point and settle payments via USDC on the Base L2 network.\n\nHowever, the specific functionality of the `/api/v1/inbox/112` endpoint is unclear. The description is simply \"Premium API Access\" with no further documentation about what data or service it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional technical documentation, schemas, or usage examples. Prospective users should be aware that the actual capabilities of this particular endpoint are undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["The specific functionality of /api/v1/inbox/112 is entirely undocumented — the description 'Premium API Access' provides no information about what data or service is returned.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content.","No OpenAPI spec, request schema, or response schema is available.","No examples of request bodies or response payloads exist in any crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/112","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/inbox/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation about what this specific endpoint does, no request/response schema, no examples, and the site's docs pages are empty. The 'Premium API Access' label is completely 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'/call':13,32 '0.02':12,31,73,153 '000':77 '20':76 '6':83 'Base network API' 'USDC API' 'accept':54 'access':70,184 'actual':228 'addit':214 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,17,24,36,46,69,86,110,183,200 'attach':97 'awar':225 'base':8,27,59,78,165 'broader':106 'caller':95 'capabl':229 'categori':111 'classif':127 'commit':92 'connect':209 'convers':144 'cost':72 'data':113,117,191 'decim':84 'descript':179 'doc':197 'document':188,216 'embed':128 'endpoint':63,147,175,233 'estim':138 'exampl':220 'exchang':133 'export':118 'feed':132 'financ':129 'function':171 'gas':137 'generat':145 'geocod':142 'header':101 'howev':168 'includ':112 'infrastructur':140 'insight':119 'json-response' 'key':18,37,87 'l2':166 'learn':122 'limit':89 'list':66,149 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':121 'metric':115 'micropayment API' 'multipl':109 'network':9,28,60,167 'no-api-key' 'page':201 'particular':232 'pay':2,21,43 'pay-per-call' 'pay-per-request':1,20,42 'payment':56,100,160 'per':3,22,44,74,154 'platform':6,25,47,107 'point':157 'post-endpoint' 'premium':68,182 'price':131,156,198 'prompt':211 'prospect':221 'protocol':52 'quot':136 'rate':88,134 'render':206 'report':116 'request':4,23,45,75,104,155 'requir':19,38,94 'return':195 'schema':217 'sentiment':123 'servic':193 'settl':159 'simpli':96,181 'site':204 'specif':62,170 'summar':126 'technic':215 'text':125 'token':135 'unclear':177 'undocu':235 'unit':79 'upfront':91 'usag':219 'usdc':15,34,55,81,162 'usdc-base-network' 'use':49 'user':222 'util':141 'valid':143 'via':10,29,161 'wallet':210 'web3':130 'x402':11,30,51,99 'x402 API' 'x402-payment'","prices":[{"id":"83863cf4-f9fc-4593-abf4-bd856480f5e2","listingId":"9fced640-faa7-4c41-ac66-f8eb1e4f818e","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/inbox/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:19.859Z"}],"sources":[{"listingId":"9fced640-faa7-4c41-ac66-f8eb1e4f818e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/112","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:19.859Z","lastSeenAt":"2026-04-22T16:32:47.841Z"}],"details":{"listingId":"9fced640-faa7-4c41-ac66-f8eb1e4f818e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/112 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/112"},{"claim":"All 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 platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/112"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless API access with crypto micropayments","Low-volume or sporadic API usage where subscriptions are overkill"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where $0.02/request adds up significantly","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.871Z"},"updatedAt":"2026-04-22T16:32:47.841Z"}}