{"id":"1d35e6d9-b1bd-4032-81b0-cad48c951d86","shortId":"zny7yQ","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource path `/api/v1/trades/190` suggests a trade-data or financial-trades endpoint, though the provider's landing page does not document this particular path explicitly. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI/ML (sentiment, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation).\n\nPayment is settled on the Base network using USDC (contract 0x8335…2913). The x402 challenge advertises a maxAmountRequired of 20000 base units; with USDC's 6 decimals that equals $0.02 per request, consistent with the site's stated flat pricing of $0.02/request across all endpoints. The provider advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nDocumentation beyond the landing page is extremely thin: the /docs, /pricing, /api, 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. The exact behavior and response format of `/api/v1/trades/190` is unknown and must be discovered by making a paid call.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","trade-data","financial-api","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["trade data API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","crypto trade endpoint"],"warnings":["No documentation available — /docs, /pricing, /api, /README all show only 'Connect wallet' with no content","The specific endpoint /api/v1/trades/190 is not listed on the provider's landing page; its purpose is unclear","No OpenAPI spec or response schema available; response format is unknown","No request body schema documented; callers must discover input format by trial"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/190","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific resource /api/v1/trades/190 is not described anywhere on the site. Effectively a stub 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'/api/v1/trades/190':46,225 '/docs':188 '/pricing':189 '/readme':192 '/request':149 '0.02':10,24,136,148 '0x8335':117 '20000':126 '2913':118 '6':132 'Base network API' 'USDC micropayment API' 'access':6,20,36,164 'across':150 'advertis':122,155 'ai/ml':85 'analyt':84 'api':5,19,35,81,157 'attach':167 'avail':217 'base':8,22,112,127 'behavior':220 'beyond':180 'broad':74 'call':80,236 'caller':165 'catalog':75 'challeng':121 'classif':88 'connect':198 'consist':139 'content':204 'contract':116 'convers':105 'crypto trade endpoint' 'data':51,83 'decim':133 'discov':231 'document':65,179 'embed':89 'endpoint':30,56,152 'equal':135 'estim':99 'exact':219 'exampl':216 'exchang':94 'explicit':69 'extrem':185 'feed':93 'financ':90 'financi':54 'financial-api' 'financial-trad':53 'flat':145 'format':223 'gas':98 'gate':3,17 'generat':106 'geocod':103 'header':172 'host':72 'infrastructur':101 'instant':163 'key':158 'land':61,182 'limit':161 'lowpaymentfee' 'lowpaymentfee.com':32 'make':233 'maxamountrequir':124 'must':229 'network':113 'no-api-key' 'no-rate-limit' 'openapi':208 'page':62,183,193 'paid':235 'particular':67 'path':45,68 'pay':9,23,78 'pay-per-cal':77 'pay-per-call API' 'pay-per-request' 'payment':40,107,171,177 'per':11,25,79,137 'premium':4,18,34 'price':92,146 'prompt':200 'proof':178 'protocol':41 'provid':33,59,154 'quot':97 'rate':95,160 'render':195 'request':12,26,138 'request/response':211 'resourc':44 'respons':222 'schema':212 'sentiment':86 'settl':109 'simpli':166 'site':71,142 'span':82 'spec':209 'specif':43 'state':144 'suggest':47 'summar':87 'thin':186 'though':57 'token':96 'trade':50,55 'trade data API' 'trade-data':49 'unit':128 'unknown':227 'usag':215 'usdc':14,28,115,130 'usdc-base' 'use':114 'util':102 'valid':104,175 'via':37 'wallet':199 'web3':91 'x':170 'x-payment':169 'x402':2,16,39,120,176 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"7c0e33f9-b625-48cf-9f3e-5db2fe6ac0b6","listingId":"1d35e6d9-b1bd-4032-81b0-cad48c951d86","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/190","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:54.484Z"}],"sources":[{"listingId":"1d35e6d9-b1bd-4032-81b0-cad48c951d86","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/190","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:54.484Z","lastSeenAt":"2026-04-26T04:32:50.479Z"}],"details":{"listingId":"1d35e6d9-b1bd-4032-81b0-cad48c951d86","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/190 \\\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":"Flat pricing of $0.02 per request, no API keys, no rate limits, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired 20000 in USDC (6 decimals) on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/190"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/190"}],"useCases":["Fetching trade or financial data on a per-request basis without subscription commitments","Agent-driven workflows that need instant, keyless API access paid in USDC on Base","Programmatic access to trade information with micropayment settlement"],"bestFor":["Agents or bots that can settle x402 payments in USDC on Base","Developers who want pay-per-use access without API key management","Low-volume or bursty workloads where flat per-request pricing is cost-effective"],"notFor":["Users who need detailed documentation or guaranteed response schemas before integrating","High-volume consumers who would benefit from bulk/subscription pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.499Z"},"updatedAt":"2026-04-26T04:32:50.479Z"}}