{"id":"1f53ad42-d33f-49ae-8026-8fe643da5b84","shortId":"BP3Q3L","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/trades/3` is listed as \"Premium API Access\" and returns a 402 challenge requesting 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/trades/3`) falls under a \"trades\" path that is not explicitly listed on the homepage's catalog, so its exact response payload is unclear. The endpoint accepts POST requests and returns `application/json`. No OpenAPI schema, detailed documentation, or example responses were found in the crawl — the docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["low payment fee API","x402 trades endpoint","USDC micropayment API","Base network API","pay-per-call API","crypto payment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /api/v1/trades/3 path is not listed in the homepage's API catalog — its purpose is unclear","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no usable content","Response payload structure is entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/3","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/trades/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no example request/response payloads, and the /api/v1/trades/3 path is not described on the homepage catalog. The actual functionality of this specific endpoint is 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 'Base network API' 'USDC micropayment API' 'accept':46,184 'access':62,92 'across':112 'addit':218 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,207 'application/json':189 'attach':95 'base':8,23,51,73 'broader':108 'call':4,19,80 'caller':93 'catalog':174 'categori':114 'challeng':67 'classif':129 'connect':213 'content':219 'convers':146 'crawl':202 'crypto payment API' 'data':115,119 'detail':193 'doc':204 'document':194 'embed':130 'endpoint':55,111,149,158,183 'estim':140 'exact':177 'exampl':196 'exchang':135 'explicit':168 'export':120 'fall':160 'feed':134 'financ':131 'found':199 'four':113 'gas':139 'generat':147 'geocod':144 'header':100 'homepag':172 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'learn':124 'limit':89 'list':58,169 'low payment fee API' 'lowpaymentfee.com':31 'machin':123 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'openapi':191 'page':208 'particular':157 'path':164 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':179 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'post':185 'post-method' 'premium':60 'price':133,151,205 'prompt':215 'proof':106 'protocol':44 'quot':138 'rate':88,136 'render':210 'report':118 'request':37,68,155,186 'respons':178,197 'return':64,188 'schema':192 'sentiment':125 'simpli':94 'specif':54 'summar':128 'text':127 'token':137 'trade':163 'unclear':181 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':214 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 trades endpoint' 'x402-payment'","prices":[{"id":"e04b6a40-b4d1-43b8-82a0-32e35bd50089","listingId":"1f53ad42-d33f-49ae-8026-8fe643da5b84","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/trades/3","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:56.276Z"}],"sources":[{"listingId":"1f53ad42-d33f-49ae-8026-8fe643da5b84","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/3","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:56.276Z","lastSeenAt":"2026-04-26T03:03:00.055Z"}],"details":{"listingId":"1f53ad42-d33f-49ae-8026-8fe643da5b84","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/3 \\\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 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/3"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/3"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data or executing trade-related queries with per-call USDC micropayments","Integrating a keyless, pay-as-you-go API into agent workflows on Base network","Programmatic access to premium data without subscription commitments"],"bestFor":["Developers wanting zero-commitment, per-request API billing","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional API key subscriptions"],"notFor":["Users who need free or ad-supported API access","Applications requiring detailed OpenAPI documentation or SDKs before integration","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.443Z"},"updatedAt":"2026-04-26T03:03:00.055Z"}}