{"id":"25abad2f-7291-4fe6-ad36-460183c8932b","shortId":"9B5BBv","kind":"x402","title":"Pay-per-call premium API access on Base network via x402, $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402, $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/trades/109` suggests a trades-related data endpoint, though the exact response payload is not documented. The provider operates a broader platform offering Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure utility APIs, all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The x402 challenge advertises a maxAmountRequired of 20000 base units, which equals $0.02 (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid payment proof. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse. The crawled docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI schema, no example request/response, and no description of what the `/api/v1/trades/109` endpoint actually returns. The endpoint is confirmed live (402 challenge captured successfully).","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["trades API","premium data endpoint","x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API"],"warnings":["No documentation available — docs/pricing/API pages only show 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/trades/109 is undocumented","Cannot verify what data is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/109","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/109","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 x402 challenge, but there is no documentation, no OpenAPI schema, no example requests or responses, and no description of what the /api/v1/trades/109 endpoint actually returns. Effectively a stub 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'/request':14,30 '0.02':13,29,86,112 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':99 '20000':107 '402':192 '6':115 'Base network API' 'USDC micropayment API' 'accept':140 'access':7,23,40 'actual':185 'addit':166 'advertis':103 'ai':74 'analyt':73 'api':6,22,39,82,118,155 'application/json':145 'attach':127 'base':9,25,94,108 'base-network' 'broader':69 'call':4,20 'caller':125 'captur':194 'challeng':102,193 'confirm':190 'connect':161 'contract':98 'crawl':151 'data':55,72 'decim':116 'descript':179 'detail':168 'doc':152 'document':64,146 'endpoint':34,56,139,184,188 'equal':111 'exact':59 'exampl':175 'extrem':148 'financ':77 'header':132 'infrastructur':80 'json-response' 'key':119 'learn':76 'limit':122 'live':191 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':75 'maxamountrequir':105 'network':10,26,95 'no-api-key' 'offer':71 'openapi':172 'oper':67 'page':156 'path':48 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payload':61 'payment':44,89,131,136 'per':3,19,87 'platform':70 'post':141 'post-method' 'premium':5,21,38 'premium data endpoint' 'price':84,153 'prompt':163 'proof':137 'protocol':45 'provid':37,66 'rate':121 'relat':54 'render':158 'request':88,142 'request/response':176 'requir':124 'respons':60 'return':144,186 'schema':173 'settl':91 'simpli':126 'spars':149 'specif':47 'success':195 'suggest':50 'technic':167 'though':57 'trade':53 'trades API' 'trades-rel':52 'unit':109 'usdc':16,32,97,113 'usdc-settlement' 'use':96,114 'util':81 'valid':135 'via':11,27,41 'wallet':162 'web3':78 'x':130 'x-payment':129 'x402':12,28,43,101 'x402 API' 'x402-payment'","prices":[{"id":"f2490c4e-cebe-43be-8260-701851e10003","listingId":"25abad2f-7291-4fe6-ad36-460183c8932b","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/109","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:25.558Z"}],"sources":[{"listingId":"25abad2f-7291-4fe6-ad36-460183c8932b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/109","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:25.558Z","lastSeenAt":"2026-04-26T11:04:13.812Z"}],"details":{"listingId":"25abad2f-7291-4fe6-ad36-460183c8932b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/109 \\\n  -H \"X-PAYMENT: <valid_x402_payment_proof>\" \\\n  -H \"Content-Type: application/json\"","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 maxAmountRequired of 20000 base units in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/109"},{"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 is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/109"}],"useCases":["Accessing trade data without subscription or API key management","Agent-driven programmatic data retrieval with per-call crypto payment","Integrating low-cost paid endpoints into automated workflows"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing","Users without access to USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.862Z"},"updatedAt":"2026-04-26T11:04:13.812Z"}}