{"id":"a93dd3fc-08f4-4847-a575-7840cffb5e37","shortId":"VQ7FVv","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 marketplace 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/93` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimal places.\n\nThe broader platform organizes its APIs into four categories: 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 uniformly priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/trades/93` is unclear; the path suggests trade data retrieval but no schema or description beyond the generic title is provided. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-api","json-response","no-api-key","no-rate-limit"],"categories":["data","finance"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-request API","Base USDC API","trades endpoint"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The /docs, /pricing, /api, and /README pages all render only 'Connect wallet' with no technical content","The specific functionality of /api/v1/trades/93 ('Premium API Access') is not described anywhere","Request body format and response structure are completely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/93","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/93","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, confirming it works. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/trades/93 is undocumented. This is effectively a stub 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'/api/v1/trades/93':66,210 '/docs':174 '/pricing':176 '/readme':178 '/request':17,34 '0.02':16,33,97,154 '000':86 '0x8335':91 '20':85 '2913':92 '402':238 '6':103 'Base USDC API' 'accept':74 'access':44,72 'advertis':80 'ai':10,27,122 'amount':83 'analysi':126 'analyt':116 'api':4,21,40,71,111,159 'avail':205 'base':7,24,60,87,94 'behind':50,209 'beyond':224 'broader':107 'categori':114 'challeng':79,239 'classif':129 'commit':167 'confirm':233 'connect':184 'convers':146 'data':9,26,115,119,217 'decim':104 'descript':223 'detail':191 'document':169,200 'embed':130 'endpoint':14,31,49,64,149,231 'equal':96 'estim':140 'exampl':203 'exchang':135 'export':120 'extrem':171 'feed':134 'financ':11,28,131 'four':113 'function':208 'gas':139 'gate':3,20,43 'generat':147 'generic':226 'geocod':144 'given':100 'infrastructur':142 'insight':121 'json-response' 'key':160 'learn':124 'limit':163 'list':68 'live':234 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'marketplac':41 'maximum':82 'metric':117 'micropay':54 'micropayment API' 'minimum':166 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':195 'organ':109 'page':179 'path':214 'pay-per-request API' 'payload':204 'per':52,98,155 'per-request':51 'per-request-micropayment' 'place':105 'platform':5,22,108 'post':75 'post-api' 'premium':70 'price':133,152 'prompt':186 'protocol':39 'provid':229 'quot':138 'rate':136,162 'render':181 'report':118 'request':53,76,99,156 'request/response':198 'requir':168 'respons':240 'retriev':218 'schema':199,221 'sentiment':125 'settl':55 'spars':172 'spec':196 'specif':63,207 'suggest':215 'summar':128 'technic':190 'text':127 'titl':227 'token':137 'trade':216 'trades endpoint' 'unclear':212 'uniform':151 'unit':88 'usdc':57,90,101 'usdc-base' 'util':13,30,143 'valid':145,237 'varieti':47 'via':235 'wallet':185 'web3':132 'x402':2,19,38,78 'x402 trades API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"b0c4d8eb-777c-4b34-af45-0e4c1aeac444","listingId":"a93dd3fc-08f4-4847-a575-7840cffb5e37","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/93","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:21.344Z"}],"sources":[{"listingId":"a93dd3fc-08f4-4847-a575-7840cffb5e37","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/93","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:21.344Z","lastSeenAt":"2026-04-25T22:32:43.244Z"}],"details":{"listingId":"a93dd3fc-08f4-4847-a575-7840cffb5e37","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/93 \\\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 maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/93"},{"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 APIs in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/93"}],"useCases":["Accessing trade data behind a per-call micropayment without needing API keys","Programmatic agents purchasing API access on-the-fly via x402 protocol","Exploring x402 payment-gated API patterns on Base network"],"bestFor":["Developers experimenting with x402 micropayment protocols","AI agents that need keyless, pay-per-call API access","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation or SDKs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.35Z"},"updatedAt":"2026-04-25T22:32:43.244Z"}}