{"id":"0c813092-fbc0-484e-8441-ff18d05cc8ed","shortId":"Rnkqd3","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-protocol API platform that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/80` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). 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 advertises four categories of endpoints: 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 endpoints are listed at the same $0.02/request price point.\n\nDocumentation is extremely sparse — 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 documentation, and no example payloads available. The specific functionality of the `/api/v1/trades/80` endpoint (what \"trades\" data it returns, what input it expects) is not documented anywhere in the crawled material. The endpoint is live and returning a valid 402 challenge, but without documentation it is difficult to know what to send or what to expect back.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-request API","x402 endpoint","USDC API","Base network API","trades API","low fee API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only 'Connect wallet'","No OpenAPI or schema specification found","The specific functionality of /api/v1/trades/80 is undocumented; 'Premium API Access' is the only description","No example request or response payloads available","Cannot verify what data the endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/80","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the specific purpose of /api/v1/trades/80 is undocumented. Pricing is clear ($0.02/request in USDC on Base), but the lack of any functional documentation makes this a stub-level 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'/api/v1/trades/80':67,217 '/docs':181 '/pricing':182 '/readme':185 '/request':17,34,173 '0.02':16,33,95,172 '000':87 '0x8335':92 '20':86 '402':244 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73 'advertis':81,127 'ai':10,27,139 'analysi':143 'analyt':133 'anywher':231 'api':4,21,41,72,103 'attach':112 'avail':211 'back':261 'base':7,24,61,88 'base-network' 'behind':51 'broader':125 'caller':110 'categori':129 'challeng':80,245 'classif':146 'connect':191 'content':197 'convers':163 'cost':84 'crawl':234 'data':9,26,132,136,221 'decim':101 'difficult':251 'document':176,206,230,248 'embed':147 'endpoint':14,31,50,65,131,166,218,237 'equal':94 'estim':157 'exampl':209 'exchang':152 'expect':227,260 'export':137 'extrem':178 'feed':151 'financ':11,28,148 'four':128 'function':214 'gas':156 'gate':3,20,44 'generat':164 'geocod':161 'header':117 'infrastructur':159 'input':225 'insight':138 'key':104 'know':253 'learn':141 'limit':107 'list':69,168 'live':239 'low fee API' 'lowpaymentfee.com':35 'machin':140 'materi':235 'maximum':83 'metric':134 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':201 'page':186 'pay-per-request API' 'payload':210 'payment':116,122 'per':53,96 'per-request':52 'per-request-billing' 'platform':5,22,42,126 'point':175 'post':76 'post-endpoint' 'premium':71 'price':150,174 'prompt':193 'proof':123 'protocol':40 'quot':155 'rate':106,153 'render':188 'report':135 'request':54,77,97 'request/response':204 'requir':109 'return':223,241 'schema':205 'send':256 'sentiment':142 'settl':56 'simpli':111 'spars':179 'spec':202 'specif':64,213 'summar':145 'text':144 'token':154 'trade':220 'trades API' 'unit':89 'usdc':58,91,98 'usdc-micropayment' 'use':99 'util':13,30,160 'valid':120,162,243 'varieti':48 'wallet':192 'web3':149 'without':247 'x':115 'x-payment':114 'x402':2,19,39,79,121 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"a2069cab-f217-488b-883a-33740d693e05","listingId":"0c813092-fbc0-484e-8441-ff18d05cc8ed","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/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:07.634Z"}],"sources":[{"listingId":"0c813092-fbc0-484e-8441-ff18d05cc8ed","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:07.634Z","lastSeenAt":"2026-04-26T01:02:58.425Z"}],"details":{"listingId":"0c813092-fbc0-484e-8441-ff18d05cc8ed","quickStartSnippet":"# The endpoint returns 402 with an x402 challenge.\n# Use an x402-compatible client to attach payment.\ncurl -X POST https://lowpaymentfee.com/api/v1/trades/80 \\\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":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/80"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data via a single micropayment without needing an API key or subscription","Programmatic agents purchasing API responses on-demand using x402 protocol","Integrating pay-per-call data endpoints into automated workflows on Base"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-per-request API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring well-documented request/response schemas","Users who need detailed API documentation or SDKs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.887Z"},"updatedAt":"2026-04-26T01:02:58.425Z"}}