{"id":"aefe7247-6860-48ca-b17a-af65f5652349","shortId":"hLJcH2","kind":"x402","title":"Pay-per-call Solana token quote via x402 on Base, $0.02 per request in USDC.","tagline":"Pay-per-call Solana token quote via x402 on Base, $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides Solana (SOL) token quotes through the x402 payment protocol. Each request costs $0.02 in USDC on the Base network — no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns JSON.\n\nThe provider operates a broader suite of pay-per-call APIs spanning crypto/finance data (token quotes, gas estimates, exchange rates, price feeds), AI/ML inference (sentiment analysis, text summarization, classification, embeddings), data analytics (metrics, reports, insights, data export), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request and settle via USDC on the Base L2 network using the x402 exact-payment scheme.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 endpoint is confirmed live (returns a valid 402 x402 challenge), but the actual response format for a paid request is unknown.","tags":[],"capabilities":["crypto-quotes","solana-price","x402-payment","usdc-settlement","base-network","pay-per-call","no-api-key"],"categories":["crypto","finance"],"synonyms":["SOL price","Solana quote","token price API","crypto price feed","SOL market data","Solana token quote"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no technical content.","No request or response schema is published; the output format of a successful paid call is unknown.","No OpenAPI specification or example payloads are available.","The breadth of advertised APIs (AI, analytics, finance, utilities all at $0.02) with zero documentation raises questions about data quality and provenance."],"endpointUrl":"https://lowpaymentfee.com/api/v1/crypto/quotes/sol","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/crypto/quotes/sol","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages are empty stubs showing only 'Connect wallet'. The actual data returned upon successful payment is completely 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'/docs':150 '/pricing':151 '/readme':154 '0.02':12,28,50,126 '402':190 'SOL market data' 'SOL price' 'Solana quote' 'Solana token quote' 'accept':69 'actual':195 'ai/ml':98 'analysi':101 'analyt':107 'api':58,86 'avail':181 'base':11,27,55,135 'base-network' 'broader':79 'call':4,20,85 'challeng':192 'classif':104 'confirm':185 'connect':160 'convers':118 'cost':49 'crypto price feed' 'crypto-quotes' 'crypto/finance':88 'data':89,106,111 'detail':167 'document':145,176 'embed':105 'endpoint':34,68,121,183 'estim':93 'exact':142 'exact-pay':141 'exampl':179 'exchang':94 'export':112 'extrem':147 'feed':97 'format':197 'gas':92 'generat':119 'geocod':116 'infer':99 'infrastructur':114 'insight':110 'json':74 'key':59 'l2':136 'limit':62 'live':186 'lowpaymentfee.com':36 'metric':108 'network':56,137 'no-api-key' 'openapi':171 'oper':77 'page':155 'paid':200 'pay':2,18,83 'pay-per-cal':1,17,82 'pay-per-call' 'payload':180 'payment':45,143 'per':3,13,19,29,84,127 'post':70 'price':96,123 'prompt':162 'protocol':46 'provid':37,76 'quot':7,23,41,91 'rate':61,95 'render':157 'report':109 'request':14,30,48,71,128,201 'request/response':174 'requir':66 'respons':196 'return':73,187 'schema':175 'scheme':144 'sentiment':100 'settl':130 'sol':39 'solana':5,21,38 'solana-price' 'span':87 'spars':148 'spec':172 'subscript':65 'suit':80 'summar':103 'technic':166 'text':102 'token':6,22,40,90 'token price API' 'uniform':124 'unknown':203 'usdc':16,32,52,132 'usdc-settlement' 'use':138 'util':115 'valid':117,189 'via':8,24,131 'wallet':161 'x402':9,25,44,140,191 'x402-payment'","prices":[{"id":"d60c7156-a9ca-42ea-aeab-69dd021322b1","listingId":"aefe7247-6860-48ca-b17a-af65f5652349","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/crypto/quotes/sol","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:54.122Z"}],"sources":[{"listingId":"aefe7247-6860-48ca-b17a-af65f5652349","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/crypto/quotes/sol","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:54.122Z","lastSeenAt":"2026-04-24T09:03:05.214Z"}],"details":{"listingId":"aefe7247-6860-48ca-b17a-af65f5652349","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/crypto/quotes/sol \\\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":"Endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/crypto/quotes/sol"},{"claim":"All APIs 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":"Token Quotes endpoint listed under Finance & Web3 category at /api/v1/crypto/quotes","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/crypto/quotes/sol"}],"useCases":["Fetching real-time Solana token price quotes for trading bots or dashboards","Integrating SOL price data into DeFi applications without managing API keys","Agent-driven portfolio tracking that pays per query with USDC on Base"],"bestFor":["Developers wanting zero-signup crypto price data","AI agents that can settle micropayments via x402","Applications needing on-demand SOL quotes without rate limits"],"notFor":["Users needing detailed historical OHLCV candle data (no evidence this is supported)","Applications requiring documented, stable response schemas with SLA guarantees","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:46.418Z"},"updatedAt":"2026-04-24T09:03:05.214Z"}}