{"id":"4966643f-5a90-478d-bcad-a7a37f559551","shortId":"rFHYE5","kind":"x402","title":"Pay-per-call trade data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call trade data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This x402-enabled endpoint at `/api/v1/trades/81` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. Each call is settled on the Base network using USDC (contract `0x8335…2913`) with no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint `/api/v1/trades/81` is labeled \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a `maxAmountRequired` of 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 exact scheme to the payee address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`, with a timeout of 300 seconds.\n\nDocumentation on the site 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 beyond the x402 challenge's `outputSchema` stub, and no description of what data the `/trades/81` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what trade data or functionality is provided. The broader platform lists many endpoints across categories (analytics, AI, finance, utilities) all at the same $0.02 price point, but none have published schemas or example payloads.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","trade-data"],"categories":["finance","data"],"synonyms":["x402 trade API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto trade endpoint","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or request/response schema published; unclear what data /api/v1/trades/81 returns","The endpoint path '/trades/81' suggests a specific resource ID but no context is given for what trade 81 represents","Cannot verify the actual response payload or data quality without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/81","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI spec, no request/response schema, and no description of what the /trades/81 endpoint actually returns. The docs pages are empty. This is effectively a stub 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'/request':17,34 '/trades/81':190 '0.02':16,33,121,232 '000':112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':136 '0x8335':78 '20':111 '2913':79 '300':141 '402':201 '402 payment API' '6':117 'Base network API' 'USDC micropayment API' 'accept':101 'access':99 'across':222 'actual':192 'address':135 'advertis':107 'ai':225 'ai/ml':61 'analyt':60,224 'api':57,82,98,152 'base':9,26,73,113 'base-network' 'beyond':176 'broader':217 'call':4,21,68 'categori':223 'challeng':106,179,202 'collect':51 'commit':90 'connect':161 'content':167 'contract':77 'crypto trade endpoint' 'data':6,23,59,188,211 'decim':118 'descript':185 'doc':151 'document':143,205 'enabl':38 'endpoint':7,24,39,93,191,195,221 'equal':120 'exact':130 'exampl':241 'extrem':148 'financ':226 'finance/web3':63 'function':213 'infer':62 'infrastructur':65 'key':83 'label':96 'limit':86 'list':219 'live':197 'lowpaymentfee' 'lowpaymentfee.com':46 'made':126 'mani':220 'maxamountrequir':109 'network':74 'no-api-key' 'none':236 'offer':49 'openapi':171 'outputschema':181 'page':156 'part':43 'pay':2,19,54 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':53 'paye':134 'payload':242 'payment':124 'per':3,20,55,122 'platform':47,218 'point':234 'post':102 'premium':97 'price':153,233 'prompt':163 'proper':200 'provid':215 'publish':238 'rate':85 'readm':155 'render':158 'request':56,103,123 'request/response':174 'return':193,198 'schema':175,239 'scheme':131 'second':142 'settl':12,29,70 'site':146 'span':58 'spars':149 'spec':172 'specif':92 'stub':182 'timeout':139 'trade':5,22,210 'trade-data' 'unclear':208 'unit':114 'upfront':89 'usdc':14,31,76,116 'usdc-settlement' 'use':75 'util':66,227 'via':10,27,127 'wallet':162 'without':204 'x402':11,28,37,105,129,178 'x402 trade API' 'x402-enabled':36 'x402-payment'","prices":[{"id":"125ba24a-6fbb-4898-bbf3-35d862e00baf","listingId":"4966643f-5a90-478d-bcad-a7a37f559551","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/81","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:05.197Z"}],"sources":[{"listingId":"4966643f-5a90-478d-bcad-a7a37f559551","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/81","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:05.197Z","lastSeenAt":"2026-04-26T02:33:42.612Z"}],"details":{"listingId":"4966643f-5a90-478d-bcad-a7a37f559551","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/81 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/81"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/81"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data on a per-request payment basis without API key registration","Integrating pay-per-call trade information into autonomous agent workflows","Testing x402 payment flows on the Base network with low-cost endpoints"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents needing keyless, pay-per-use data endpoints on Base","Low-volume or sporadic trade data lookups without subscription commitments"],"notFor":["Production workloads requiring well-documented request/response schemas","High-volume trade data consumers who need bulk pricing or streaming feeds","Users who need fiat-only payment options without crypto wallets"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.072Z"},"updatedAt":"2026-04-26T02:33:42.612Z"}}