{"id":"ca3dfb4d-5207-40ce-89b3-9bd5af9d2d88","shortId":"4CH78V","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. The specific resource path `/api/v1/trades/166` suggests a trade-data or financial-trade endpoint, though the exact response payload is not documented. Payment is settled in USDC (contract 0x8335…2913 on Base) at a cost of $0.02 per request (20,000 base units with 6 decimals).\n\nThe broader lowpaymentfee.com platform advertises a suite of x402-gated APIs spanning data & analytics, AI/ML inference (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation) — all at the same $0.02/request price point. The platform emphasizes no API keys, no rate limits, and instant access.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live via a valid 402 challenge, but the actual data returned after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","per-request-billing","no-api-key","trade-data"],"categories":["finance","data"],"synonyms":["trade data API","x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto trade endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or output schema provided; the actual response payload after payment is unknown.","The specific endpoint /api/v1/trades/166 is not listed on the homepage's API catalog, making its purpose unclear.","No request body schema documented — unclear what POST body (if any) is expected."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/166","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific purpose of /api/v1/trades/166 is unclear beyond the generic 'Premium API Access' label. This is effectively a stub 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'/request':144 '0.02':10,28,91,143 '000':95 '0x8335':83 '20':94 '2913':84 '402':205 '6':99 'Base network API' 'USDC micropayment API' 'access':6,24,44,158 'actual':209 'advertis':105 'ai/ml':116 'analyt':115 'api':5,16,23,34,43,112,151,165 'avail':193 'base':8,26,52,86,96 'base-network' 'broader':102 'challeng':206 'classif':120 'confirm':200 'connect':174 'content':180 'contract':82 'convers':137 'cost':89 'crawl':196 'crypto trade endpoint' 'data':63,114,210 'decim':100 'doc':164 'document':76,159 'embed':121 'emphas':149 'endpoint':38,68,198 'estim':131 'exact':71 'exampl':192 'exchang':126 'extrem':161 'feed':125 'financ':122 'financi':66 'financial-trad':65 'gas':130 'gate':3,21,111 'generat':138 'geocod':135 'infer':117 'infrastructur':133 'instant':157 'key':17,35,152 'limit':155 'live':201 'lowpaymentfee' 'lowpaymentfee.com':40,103 'network':53 'no-api-key' 'openapi':184 'page':169 'path':57 'pay':9,27 'pay-per-call API' 'payload':73 'payment':48,77,213 'per':11,29,92 'per-request-billing' 'platform':104,148 'point':146 'premium':4,22,42 'price':124,145,166 'prompt':176 'protocol':49 'provid':41 'quot':129 'rate':127,154 'readm':168 'render':171 'request':12,30,93 'request/response':187 'requir':18,36 'resourc':56 'respons':72 'return':211 'schema':188 'sentiment':118 'settl':79 'span':113 'spars':162 'spec':185 'specif':55 'suggest':59 'suit':107 'summar':119 'though':69 'token':128 'trade':62,67 'trade data API' 'trade-data':61 'unit':97 'unknown':215 'usag':191 'usdc':14,32,81 'usdc-settlement' 'util':134 'valid':136,204 'via':45,202 'wallet':175 'web3':123 'x402':2,20,47,110 'x402 API' 'x402-gated':1,19,109 'x402-payment'","prices":[{"id":"151a1def-5f11-44a2-bcb2-64d4d828ec55","listingId":"ca3dfb4d-5207-40ce-89b3-9bd5af9d2d88","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/166","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:40.179Z"}],"sources":[{"listingId":"ca3dfb4d-5207-40ce-89b3-9bd5af9d2d88","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/166","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:40.179Z","lastSeenAt":"2026-04-26T07:03:05.508Z"}],"details":{"listingId":"ca3dfb4d-5207-40ce-89b3-9bd5af9d2d88","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/166 \\\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 valid x402 402 challenge with USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/166"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/trades/166"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/166"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data or trade details for a specific trade ID via micropayment","Programmatic agent access to paid API endpoints without API key management","Integrating pay-per-request financial data into automated trading workflows"],"bestFor":["Agents or bots that need keyless, pay-per-call API access on Base","Developers experimenting with x402 payment protocol integrations","Low-volume consumers who want no subscription commitment"],"notFor":["Users needing detailed API documentation or response schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.194Z"},"updatedAt":"2026-04-26T07:03:05.508Z"}}