{"id":"89e22a91-60a5-4ed6-abd9-56c645e75824","shortId":"AWQfCs","kind":"x402","title":"Pay-per-call market quote endpoint for transaction data, settled in USDC on Base via x402.","tagline":"Pay-per-call market quote endpoint for transaction data, settled in USDC on Base via x402.","description":"This endpoint at lowpaymentfee.com provides a market quote for transactions (TXN) via a POST request to `/api/v1/market/quote/TXN`. It is part of a broader suite of pay-per-request APIs offered by the same provider, spanning data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints on the platform use the x402 payment protocol, settling in USDC on the Base network.\n\nThe specific endpoint probed returns a valid x402 challenge (HTTP 402) with a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the provider's advertised flat pricing of $0.02/request across all APIs. The payment scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are required; access is granted purely through the x402 payment header.\n\nDocumentation 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 schema, no request/response examples, and no detailed description of what the `/market/quote/TXN` endpoint actually returns. The endpoint name and path suggest it provides some form of market or price quote related to transactions, but the exact input parameters and response format are unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","market-quote","pay-per-request","no-api-key","post-endpoint"],"categories":["finance","crypto"],"synonyms":["market quote","transaction quote","price quote","TXN quote","crypto market data","x402 API","pay-per-call finance API"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided; input parameters and response format are unknown","The exact data returned by /api/v1/market/quote/TXN is unverified — the name is the only clue","Provider appears to list many endpoints but none have documented behavior"],"endpointUrl":"https://lowpaymentfee.com/api/v1/market/quote/TXN","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/market/quote/TXN","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and no description of what the endpoint actually returns. This is effectively a stub 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'/market/quote/txn':211 '/request':143 '0.02':130,142 '000':113 '0x8335':118 '20':112 '2913':119 '300':154 '402':106 '6':125 'TXN quote' 'access':165 'across':144 'actual':213 'advertis':138 'ai/ml':73 'amount':110 'analyt':72 'api':64,146,158,180 'base':15,32,94,114,121 'base-network' 'broader':57 'call':4,21 'challeng':104 'connect':189 'consist':133 'content':195 'crypto market data' 'data':10,27,71 'decim':126 'descript':207 'detail':206 'doc':179 'document':174 'endpoint':7,24,36,80,98,212,216 'exact':151,235 'exampl':203 'extrem':176 'finance/web3':75 'flat':139 'form':224 'format':240 'grant':167 'header':173 'http':105 'infer':74 'infrastructur':77 'input':236 'key':159 'limit':162 'lowpaymentfee.com':38 'market':5,22,41,226 'market quote' 'market-quote' 'maximum':109 'name':217 'network':95 'no-api-key' 'offer':65 'openapi':199 'page':184 'paramet':237 'part':54 'path':219 'pay':2,19,61 'pay-per-cal':1,18 'pay-per-call finance API' 'pay-per-request':60 'payment':87,148,172 'per':3,20,62,131 'platform':83 'post':48 'post-endpoint' 'price':140,181,228 'price quote' 'probe':99 'prompt':191 'protocol':88 'provid':39,69,136,222 'pure':168 'quot':6,23,42,229 'rate':161 'readm':183 'relat':230 'render':186 'request':49,63,132 'request/response':202 'requir':164 'respons':239 'return':100,214 'schema':200 'scheme':149 'second':155 'settl':11,28,89 'sinc':122 'span':70 'spars':177 'specif':97 'suggest':220 'suit':58 'timeout':156 'transact':9,26,44,232 'transaction quote' 'translat':128 'txn':45 'unit':115 'unknown':242 'usdc':13,30,91,117,123 'usdc-settlement' 'use':84,124 'util':78 'valid':102 'via':16,33,46 'wallet':190 'x402':17,34,86,103,171 'x402 API' 'x402-payment'","prices":[{"id":"601e6d31-97c2-4265-b271-4a242cd9defd","listingId":"89e22a91-60a5-4ed6-abd9-56c645e75824","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/market/quote/TXN","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:49.167Z"}],"sources":[{"listingId":"89e22a91-60a5-4ed6-abd9-56c645e75824","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/market/quote/TXN","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:49.167Z","lastSeenAt":"2026-04-23T20:01:33.288Z"}],"details":{"listingId":"89e22a91-60a5-4ed6-abd9-56c645e75824","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/market/quote/TXN \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402_payment_header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/market/quote/TXN"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/market/quote/TXN"},{"claim":"All APIs 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 provider offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching real-time market quotes for transactions","Integrating pay-per-call market data into trading bots or agents","Querying transaction-level pricing without API key management"],"bestFor":["Agents needing on-demand market quotes with no subscription","Developers who want frictionless crypto-settled API access on Base","Low-volume or sporadic market data consumers who prefer per-call pricing"],"notFor":["High-frequency trading requiring sub-second latency guarantees (no SLA documented)","Users who need detailed API documentation or response schema before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:34:44.748Z"},"updatedAt":"2026-04-23T20:01:33.288Z"}}