{"id":"08f2e082-4e71-4393-8ca7-b74de78d4246","shortId":"MmH4EL","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/174` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request given USDC's 6 decimals.\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 listed endpoints share the same $0.02/request pricing 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 schema, no request/response examples, and no description of what the `/api/v1/trades/174` endpoint specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what input parameters are expected or what the response payload looks like.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-request API","Base USDC API","trades endpoint"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for /api/v1/trades/174","The specific purpose and data returned by the /api/v1/trades/174 endpoint is unknown","No request or response examples available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/174","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/174","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 is operational. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/trades/174 is undocumented. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34,154 '0.02':16,33,97,153 '000':86 '0x8335':91 '20':85 '2913':92 '402':216 '6':103 'Base USDC API' 'accept':74 'access':44,72 'advertis':80 'ai':10,27,121 'amount':83 'analysi':125 'analyt':115 'api':4,21,40,71,110,158,174 'base':7,24,60,87,94 'behind':50 'broader':106 'categori':113 'challeng':79,217 'classif':128 'commit':166 'connect':183 'convers':145 'data':9,26,114,118 'decim':104 'descript':201 'detail':190 'doc':173 'document':168,220 'embed':129 'endpoint':14,31,49,64,149,206,210 'equal':96 'estim':139 'exampl':198 'exchang':134 'expect':228 'export':119 'extrem':170 'feed':133 'financ':11,28,130 'four':112 'gas':138 'gate':3,20,43 'generat':146 'geocod':143 'given':100 'infrastructur':141 'input':225 'insight':120 'json-response' 'key':159 'learn':123 'like':235 'limit':162 'list':68,148 'live':212 'look':234 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'marketplac':41 'max':82 'metric':116 'micropay':54 'micropayment API' 'minimum':165 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':194 'organ':108 'page':178 'paramet':226 'pay-per-request API' 'payload':233 'per':52,98 'per-request':51 'per-request-micropayment' 'platform':5,22,107 'post':75 'post-endpoint' 'premium':70 'price':132,155,175 'prompt':185 'protocol':39 'quot':137 'rate':135,161 'readm':177 'render':180 'report':117 'request':53,76,99 'request/response':197 'requir':167 'respons':232 'return':208,213 'schema':195 'sentiment':124 'settl':55 'share':150 'spars':171 'specif':63,207 'summar':127 'technic':189 'text':126 'token':136 'trades endpoint' 'unclear':223 'unit':88 'usdc':57,90,101 'usdc-base' 'util':13,30,142 'valid':144,215 'varieti':47 'wallet':184 'web3':131 'without':219 'x402':2,19,38,78 'x402 trades API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"1189a61a-75e9-4023-89c5-3cd35d897153","listingId":"08f2e082-4e71-4393-8ca7-b74de78d4246","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:39.580Z"}],"sources":[{"listingId":"08f2e082-4e71-4393-8ca7-b74de78d4246","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/174","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:39.580Z","lastSeenAt":"2026-04-26T07:03:05.507Z"}],"details":{"listingId":"08f2e082-4e71-4393-8ca7-b74de78d4246","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl as a conceptual example (actual payment header must be constructed per x402 spec):\ncurl -X POST https://lowpaymentfee.com/api/v1/trades/174 \\\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/174"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/174"}],"useCases":["Accessing trade data or premium content behind a per-call micropayment wall","Programmatic agents purchasing API responses without pre-registration or API keys","Exploring x402 protocol integration for pay-per-use API consumption"],"bestFor":["Developers experimenting with x402 micropayment-gated APIs","AI agents that need keyless, pay-per-call API access on Base","Users who want to avoid subscriptions and pay only per request"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.248Z"},"updatedAt":"2026-04-26T07:03:05.507Z"}}