{"id":"9460ccde-ef60-48d9-bf00-48c384c50724","shortId":"jAyQn8","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/payments/212` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader 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 the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/payments/212`) is confirmed live, returning a proper 402 challenge with x402 version 1. However, the crawled documentation pages (docs, pricing, API, README) all returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas and detailed behavior of this endpoint remain unknown. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["No documentation available — all doc pages (docs, pricing, API, README) returned only a 'Connect wallet' prompt with no substantive content.","No request or response schema is provided; the actual functionality of /api/v1/payments/212 is unknown.","The endpoint path '/api/v1/payments/212' does not match any of the advertised API categories on the homepage, making its purpose ambiguous.","The platform lists many endpoint categories but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/212","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/payments/212","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 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages returned only 'Connect wallet' with no content. The purpose of this specific '/payments/212' endpoint beyond 'Premium API Access' is 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'/request':13,30,152 '0.02':12,29,78,151 '000':72 '1':170 '20':71 '402':165 'Base network API' 'USDC micropayment API' 'accept':50,206 'access':66,92 'across':108 'actual':193 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,15,22,32,42,65,85,178 'application/json':211 'attach':95 'base':8,25,55,73 'behavior':198 'broader':104 'call':4,21,80 'categori':110 'challeng':166 'charg':68 'classif':125 'confirm':160 'connect':184 'content':190 'convers':142 'crawl':173 'crypto-paid API' 'data':111,115 'detail':197 'doc':176 'document':174 'embed':126 'endpoint':59,107,145,157,201,205 'estim':136 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'gas':135 'generat':143 'geocod':140 'header':99 'howev':171 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':16,33,86 'learn':120 'limit':89 'list':62,147 'live':161 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':119 'metric':113 'network':56 'no-api-key' 'offer':106 'page':175 'particular':156 'pay':2,19,39 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':38 'payment':52,98 'per':3,20,40,79 'platform':6,23,43,82,105 'point':154 'post':207 'post-method' 'premium':64 'price':129,153,177 'prompt':186 'proper':164 'protocol':48 'quot':134 'rate':88,132 'readm':179 'remain':202 'report':114 'request':41,102,208 'request/response':194 'requir':17,34 'return':162,181,210 'schema':195 'sentiment':121 'simpli':94 'specif':58 'substant':189 'summar':124 'text':123 'token':133 'unit':74 'unknown':203 'usdc':9,26,51,76 'usdc-base-network' 'use':45 'util':139 'valid':141 'version':169 'via':10,27 'wallet':185 'web3':128 'x402':11,28,47,97,168 'x402 API' 'x402-payment'","prices":[{"id":"e26c9905-34dc-4a90-bafc-0b319cb145cc","listingId":"9460ccde-ef60-48d9-bf00-48c384c50724","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/payments/212","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:58.423Z"}],"sources":[{"listingId":"9460ccde-ef60-48d9-bf00-48c384c50724","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/212","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:58.423Z","lastSeenAt":"2026-04-24T04:03:49.269Z"}],"details":{"listingId":"9460ccde-ef60-48d9-bf00-48c384c50724","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/212 \\\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 challenge with x402 version 1, accepting USDC on Base with maxAmountRequired of 20000 base units ($0.02).","source_url":"https://lowpaymentfee.com/api/v1/payments/212"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/payments/212"},{"claim":"Documentation pages (docs, pricing, API, README) returned 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, AI, finance, or utility endpoints without subscription commitments"],"bestFor":["Developers who want to pay per call without managing API keys or subscriptions","AI agents that can settle x402 payments autonomously on Base","Low-volume or bursty workloads where flat-rate plans are wasteful"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Anyone without a Base-compatible USDC wallet or x402 client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.456Z"},"updatedAt":"2026-04-24T04:03:49.269Z"}}