{"id":"6ea24c5c-e26c-43ef-a8e9-9de29678b229","shortId":"bv4c8L","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is a multi-category API platform that gates access via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/trades/88` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…) on Base. The x402 challenge advertises a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request. No API keys or rate limits are required — 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 listed endpoints share the same $0.02/request pricing.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/trades/88` is unclear — the path suggests a trade-related resource (possibly retrieving or executing trade #88), but no documentation describes the expected input or output format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["finance","llm","geo","data"],"synonyms":["low payment fee API","x402 API","pay-per-call API","Base network API","USDC micropayment API","trades API","crypto API gateway"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for any endpoint","The specific function of /api/v1/trades/88 is undocumented and unclear","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/88","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is zero documentation for the /api/v1/trades/88 endpoint — no request schema, no response schema, no examples, and no OpenAPI spec. The docs pages all render only 'Connect wallet' with no content. The purpose of this specific endpoint is 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'/request':16,32,163 '0.02':15,31,90,162 '000':80 '0x8335':69 '20':79 '6':85 '88':222 'Base network API' 'USDC micropayment API' 'accept':64 'access':43,62 'across':120 'advertis':75 'ai':9,25,130 'ai-inference' 'analysi':134 'analyt':8,24,124 'api':4,20,39,61,94,171 'attach':103 'avail':201 'base':7,23,51,71,81 'behind':205 'broader':116 'caller':101 'categori':38,122 'challeng':74 'classif':137 'connect':180 'contract':68 'convers':154 'crypto API gateway' 'crypto-data' 'data':123,127 'data-analytics' 'decim':86 'describ':226 'detail':187 'doc':170 'document':165,196,225 'embed':138 'endpoint':13,29,55,119,158 'equal':89 'estim':148 'exampl':199 'exchang':143 'execut':220 'expect':228 'export':128 'extrem':167 'feed':142 'financ':10,26,139 'finance-data' 'format':232 'four':121 'function':204 'gas':147 'gate':3,19,42 'generat':155 'geocod':152 'header':108 'infrastructur':150 'input':229 'insight':129 'key':95 'learn':132 'limit':98 'list':58,157 'low payment fee API' 'lowpaymentfee.com':33 'machin':131 'maxamountrequir':77 'metric':125 'multi':37 'multi-categori':36 'network':52 'no-api-key' 'no-rate-limit' 'offer':118 'openapi':191 'output':231 'page':175 'path':210 'pay-per-call API' 'pay-per-request' 'payload':200 'payment':47,65,107,113 'per':91 'platform':40,117 'possibl':217 'premium':60 'price':141,164,172 'prompt':182 'proof':114 'protocol':48 'quot':146 'rate':97,144 'readm':174 'relat':215 'render':177 'report':126 'request':92 'request/response':194 'requir':100 'resourc':216 'retriev':218 'schema':195 'sentiment':133 'share':159 'simpli':102 'spars':168 'spec':192 'specif':54,203 'suggest':211 'suit':5,21 'summar':136 'technic':186 'text':135 'token':145 'trade':214,221 'trade-rel':213 'trades API' 'unclear':208 'unit':82 'usdc':67,88 'usdc-base' 'util':12,28,151 'utility-services' 'valid':111,153 'via':44 'wallet':181 'web3':140 'x':106 'x-payment':105 'x402':2,18,46,73,112 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"c9dcbefd-60e0-4bb2-8019-1996182f28d6","listingId":"6ea24c5c-e26c-43ef-a8e9-9de29678b229","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/88","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:00.402Z"}],"sources":[{"listingId":"6ea24c5c-e26c-43ef-a8e9-9de29678b229","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/88","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:00.402Z","lastSeenAt":"2026-04-22T23:02:06.255Z"}],"details":{"listingId":"6ea24c5c-e26c-43ef-a8e9-9de29678b229","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/88 \\\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":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/88"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/88"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data or executing trades via a single pay-per-call endpoint","Querying analytics metrics and reports without subscription commitments","Running AI inference (sentiment, summarization, classification, embeddings) on demand","Fetching real-time crypto prices, gas estimates, and exchange rates"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Micropayment-based workflows where per-request billing is preferred","x402-compatible clients on the Base network paying in USDC"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Developers who cannot send x402 payment headers or hold USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.23Z"},"updatedAt":"2026-04-22T23:02:06.255Z"}}