{"id":"2734873e-91ea-469b-8e99-7127d9679d20","shortId":"DUugGG","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 at `/api/v1/payments/363` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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/request price point. However, the specific functionality behind the `/api/v1/payments/363` endpoint is not documented beyond its \"Premium API Access\" label, so its exact behavior is unclear.\n\nPayments settle on the Base L2 network to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge uses the \"exact\" payment scheme with a 300-second timeout. The endpoint accepts POST requests and returns `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay per call API","USDC API access","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["The exact functionality of /api/v1/payments/363 is undocumented — 'Premium API Access' is the only description available.","All documentation, pricing, and API pages beyond the landing page render only a 'Connect wallet' prompt with no useful content.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","The platform lists many API categories (AI, finance, data, etc.) but it is unclear which, if any, are fully functional."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/363","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/363","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation on what the endpoint actually does or returns. No OpenAPI schema, no example requests/responses, and the crawled docs/pricing/API pages are all blank beyond a wallet-connect prompt. The \"Premium API Access\" label is generic and 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'/request':13,28,151 '0.02':12,27,67,150 '000':71 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':186 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':190 '20':70 '300':201 '402 payment API' '6':77 'Base network API' 'USDC API access' 'accept':46,206 'access':62,169 'account':82 'address':185 'advertis':105 'ai':117 'analysi':121 'analyt':111 'api':5,20,38,61,80,107,168 'application/json':211 'attach':90 'base':8,23,51,72,181 'behavior':174 'behind':158 'beyond':165 'broader':103 'call':4,19,69 'caller':88 'categori':108 'challeng':193 'charg':64 'classif':124 'contract':189 'convers':141 'data':110,114 'decim':78 'document':164 'embed':125 'endpoint':55,144,161,205 'estim':135 'exact':173,196 'exchang':130 'export':115 'feed':129 'financ':126 'function':157 'gas':134 'generat':142 'geocod':139 'header':95 'howev':154 'includ':109 'infrastructur':137 'insight':116 'json-response' 'key':81 'l2':182 'label':59,170 'learn':119 'limit':85 'list':146 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':118 'metric':112 'micropayment API' 'multipl':106 'network':9,24,52,183 'no-api-key' 'pay':2,17,35 'pay per call API' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,94,100,177,197 'per':3,18,36,68 'platform':6,21,39,104 'point':153 'post':207 'post-method' 'premium':60,167 'price':128,152 'proof':101 'protocol':44 'quot':133 'rate':84,131 'report':113 'request':37,208 'requir':87 'return':210 'scheme':198 'second':202 'sentiment':120 'settl':178 'simpli':89 'specif':54,156 'summar':123 'text':122 'timeout':203 'token':132 'unclear':176 'unit':73 'usdc':15,30,47,75,188 'usdc-base' 'use':41,187,194 'util':138 'valid':98,140 'via':10,25 'web3':127 'x':93 'x-payment':92 'x402':11,26,43,99,192 'x402 API' 'x402-payment'","prices":[{"id":"ee88b351-07d1-431e-9771-8023bc483a70","listingId":"2734873e-91ea-469b-8e99-7127d9679d20","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/363","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:31.352Z"}],"sources":[{"listingId":"2734873e-91ea-469b-8e99-7127d9679d20","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/363","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:31.352Z","lastSeenAt":"2026-04-22T21:31:09.688Z"}],"details":{"listingId":"2734873e-91ea-469b-8e99-7127d9679d20","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/363 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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","source_url":"https://lowpaymentfee.com/api/v1/payments/363"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/363"},{"claim":"Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without account registration","Agent-driven API consumption with per-call USDC micropayments on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers wanting zero-signup API access via crypto micropayments","AI agents that need to autonomously purchase API calls","Users already holding USDC on the Base network"],"notFor":["Users who need detailed documentation on what the endpoint actually returns","Anyone requiring fiat payment rails or non-crypto billing","High-volume consumers who prefer subscription-based pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.841Z"},"updatedAt":"2026-04-22T21:31:09.688Z"}}