{"id":"2ed584c1-1135-4867-bb20-9cd7c25a14e1","shortId":"NK52wn","kind":"x402","title":"x402-gated token data endpoint for FXS on Base, pay $0.02 per request in USDC.","tagline":"x402-gated token data endpoint for FXS on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides token data for FXS (Frax Share) via the x402 payment protocol. It is part of a broader platform offering data & analytics, AI/ML inference, finance/Web3, and infrastructure APIs — all gated behind x402 micropayments on the Base network.\n\nThe specific endpoint `/api/v1/tokens/FXS` falls under the Finance & Web3 category of the platform. Based on the x402 challenge, each request costs up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). Payment is made via the x402 \"exact\" scheme, meaning the caller includes an X-PAYMENT header with a signed payment for each request. No API keys, rate limits, or subscriptions are required — just a funded wallet on Base.\n\nDocumentation on the site is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but the actual response format for a successful paid request is unknown. The platform lists many other endpoints across analytics, AI, finance, and utility categories, all at the same $0.02 price point.","tags":[],"capabilities":["x402-payment","token-data","usdc-base","per-request-micropayment","no-api-key","crypto-market-data"],"categories":["finance","crypto"],"synonyms":["FXS token data","Frax Share price","crypto token API","x402 token endpoint","Base USDC micropayment API","token quotes","crypto data feed"],"warnings":["No API documentation available — docs, pricing, and README pages only show a 'Connect wallet' prompt","No OpenAPI or schema definition for request or response payloads","Actual response format for a paid request to /api/v1/tokens/FXS is unknown","The platform lists many endpoints across diverse categories (AI, analytics, finance, utils) all at $0.02 — unclear how mature or production-ready each is"],"endpointUrl":"https://lowpaymentfee.com/api/v1/tokens/FXS","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/tokens/FXS","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 challenge and clear pricing ($0.02/request in USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples of what a successful response looks like. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'0.02':12,28,109,236 '000':98 '0x8335':103 '20':97 '2913':104 '402':201 '6':114 'Base USDC micropayment API' 'FXS token data' 'Frax Share price' 'across':225 'actual':209 'addit':178 'ai':227 'ai/ml':59 'analyt':58,226 'api':64,141,164 'avail':194 'base':10,26,72,87,99,106,154 'behind':67 'broader':54 'call':111 'caller':126 'categori':83,231 'challeng':91,206 'confirm':198 'connect':173 'cost':94 'crypto data feed' 'crypto token API' 'crypto-market-data' 'data':5,21,39,57 'decim':115 'detail':180 'doc':163 'document':155,189 'endpoint':6,22,34,76,196,224 'equal':108 'exact':122 'exampl':192 'extrem':160 'fall':78 'financ':81,228 'finance/web3':61 'format':211 'frax':42 'fund':151 'fxs':8,24,41 'gate':3,19,66 'header':132 'includ':127 'infer':60 'infrastructur':63 'key':142 'limit':144 'list':221 'live':199 'lowpaymentfee.com':36 'made':118 'mani':222 'mean':124 'micropay':69 'network':73 'no-api-key' 'offer':56 'openapi':184 'page':168 'paid':215 'part':51 'pay':11,27 'payload':193 'payment':47,116,131,136 'per':13,29,110 'per-request-micropayment' 'platform':55,86,220 'point':238 'price':165,237 'prompt':175 'protocol':48 'provid':37 'rate':143 'readm':167 'render':170 'request':14,30,93,139,216 'request/response':187 'requir':148 'respons':210 'return':200 'schema':188 'scheme':123 'share':43 'sign':135 'site':158 'spars':161 'spec':185 'specif':75 'subscript':146 'success':214 'technic':179 'token':4,20,38 'token quotes' 'token-data' 'unit':100 'unknown':218 'usdc':16,32,102,112 'usdc-base' 'use':113 'util':230 'valid':204 'via':44,119 'wallet':152,174 'web3':82 'x':130 'x-payment':129 'x402':2,18,46,68,90,121,205 'x402 token endpoint' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"77c966cb-1f49-4bcd-baec-244114eb7bb5","listingId":"2ed584c1-1135-4867-bb20-9cd7c25a14e1","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/tokens/FXS","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:25.089Z"}],"sources":[{"listingId":"2ed584c1-1135-4867-bb20-9cd7c25a14e1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/tokens/FXS","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:25.089Z","lastSeenAt":"2026-04-23T20:01:31.592Z"}],"details":{"listingId":"2ed584c1-1135-4867-bb20-9cd7c25a14e1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/tokens/FXS \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/tokens/FXS"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/tokens/FXS"}],"useCases":["Fetching current FXS (Frax Share) token data programmatically with per-call payment","Integrating token information into trading bots or portfolio dashboards without API key management","Agent-driven workflows that need on-demand crypto token lookups settled via x402 micropayments"],"bestFor":["Developers wanting zero-signup, pay-per-call crypto token data","AI agents that can settle x402 payments on Base","Projects needing FXS/Frax Share data without rate limits or subscriptions"],"notFor":["Users who need free or bulk-discounted token data at high volume","Anyone requiring detailed API documentation or guaranteed SLA before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:35:34.917Z"},"updatedAt":"2026-04-23T20:01:31.592Z"}}