{"id":"21bf4650-f0d9-4c3b-bc61-9c2e2891b7bd","shortId":"DdfUak","kind":"x402","title":"Pay-per-use DeFi gas price data via x402 micropayments on Base, Solana, and SKALE.","tagline":"Pay-per-use DeFi gas price data via x402 micropayments on Base, Solana, and SKALE.","description":"Silverback is a suite of DeFi intelligence endpoints accessible via the x402 micropayment protocol. The `/api/v1/gas-price` endpoint is one of 11 paid endpoints offered by the Silverback x402 API. However, this specific endpoint is not documented in the published OpenAPI specification, which covers swap execution, technical analysis, DeFi yield, arbitrage scanning, token audits, whale tracking, wallet portfolios, pool analysis, swap quotes, Jupiter quotes, and holder analytics — but does not list a `gas-price` route.\n\nThe probe returned 404 on both GET and POST for this endpoint, and the OpenAPI spec hosted at the canonical server (`x402.silverbackdefi.app`) does not include `/api/v1/gas-price`. The endpoint may have been removed, renamed, or is served at a different base URL than the one probed (`silverback-x402.onrender.com` vs `x402.silverbackdefi.app`). The root landing page at the Render origin is live and advertises 11 paid endpoints with USDC payments on Base, Solana, and SKALE chains.\n\nThe broader Silverback API offers DeFi intelligence priced from $0.01 to $0.05 per call, covering swap routing, liquidity analysis, yield optimization, security audits, and on-chain analytics. All endpoints use the x402 protocol: callers receive a 402 challenge, sign a USDC authorization, and resend with payment proof. Without confirmation that the gas-price endpoint is live or documented, agents should treat this specific route as potentially unavailable.","tags":[],"capabilities":["gas-price","x402-micropayments","defi-intelligence","usdc-payments","base-chain","solana-chain","skale-chain"],"categories":["defi","crypto","gas"],"synonyms":["gas price API","gas fee estimator","blockchain gas cost","DeFi gas tracker","x402 gas price","crypto gas oracle"],"warnings":["Endpoint returned 404 on both GET and POST — may be removed, renamed, or hosted at a different base URL (x402.silverbackdefi.app vs silverback-x402.onrender.com).","The /api/v1/gas-price route is not listed in the published OpenAPI specification.","No request/response schema available for this endpoint.","The canonical server in the OpenAPI spec is x402.silverbackdefi.app, not silverback-x402.onrender.com — the endpoint may work at the canonical URL."],"endpointUrl":"https://silverback-x402.onrender.com/api/v1/gas-price","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"5000","scheme":"exact","network":"eip155:1187947933","maxTimeoutSeconds":300},{"asset":"USDC","extra":{"symbol":"USDC","nodeUrl":"https://api.keeta.com","decimals":6,"serverAddress":"keeta_aabwgiqyij4scwktdoczzvhpi33btieeses5sezeqzqmpi5ik76ttyegwuvfsai","permissionSetupUrl":"/api/v1/keeta/setup-permission"},"payTo":"keeta_aabaolle2k3hceayy4vkyw7smgl35o5wbqeebt2fibyx5sxxodneqb2rmwqkjci","amount":"5000","scheme":"keeta-usdc","network":"keeta:main","expiresAt":1771370260743,"paymentId":"f19782ba-8237-4d99-93b4-1d9957a77d28","amountHuman":"0.005000","description":"Current gas prices on Base chain","tokenAddress":"keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna","maxTimeoutSeconds":300,"requiresPermission":true}]},"qualityScore":"0.200","qualityRationale":"The specific /api/v1/gas-price endpoint returned 404 on both GET and POST and is absent from the published OpenAPI spec. There is no schema, no example, and no documentation for this route. The broader Silverback API is documented but this particular endpoint appears unavailable or 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'0.01':189 '0.05':191 '11':53,168 '402':217 '404':111 'DeFi gas tracker' 'access':41 'advertis':167 'agent':240 'analysi':79,91,198 'analyt':98,207 'api':61,183 'arbitrag':82 'audit':85,202 'author':222 'base':13,29,147,175 'base-chain' 'blockchain gas cost' 'broader':181 'call':193 'caller':214 'canon':127 'chain':179,206 'challeng':218 'confirm':229 'cover':75,194 'crypto gas oracle' 'data':8,24 'defi':5,21,38,80,185 'defi-intelligence' 'differ':146 'document':68,239 'endpoint':40,49,55,65,119,135,170,209,235 'execut':77 'gas':6,22,105,233 'gas fee estimator' 'gas price API' 'gas-pric':104,232 'gas-price' 'get':114 'holder':97 'host':124 'howev':62 'includ':132 'intellig':39,186 'jupit':94 'land':158 'liquid':197 'list':102 'live':165,237 'may':136 'micropay':11,27,45 'offer':56,184 'on-chain':204 'one':51,151 'openapi':72,122 'optim':200 'origin':163 'page':159 'paid':54,169 'pay':2,18 'pay-per-us':1,17 'payment':173,226 'per':3,19,192 'pool':90 'portfolio':89 'post':116 'potenti':247 'price':7,23,106,187,234 'probe':109,152 'proof':227 'protocol':46,213 'publish':71 'quot':93,95 'receiv':215 'remov':139 'renam':140 'render':162 'resend':224 'return':110 'root':157 'rout':107,196,245 'scan':83 'secur':201 'serv':143 'server':128 'sign':219 'silverback':33,59,182 'silverback-x402.onrender.com':153 'skale':16,32,178 'skale-chain' 'solana':14,30,176 'solana-chain' 'spec':123 'specif':64,73,244 'suit':36 'swap':76,92,195 'technic':78 'token':84 'track':87 'treat':242 'unavail':248 'url':148 'usdc':172,221 'usdc-payments' 'use':4,20,210 'via':9,25,42 'vs':154 'wallet':88 'whale':86 'without':228 'x402':10,26,44,60,212 'x402 gas price' 'x402-micropayments' 'x402.silverbackdefi.app':129,155 'yield':81,199","prices":[{"id":"5d732342-2898-4045-a096-90b5e822d5bc","listingId":"21bf4650-f0d9-4c3b-bc61-9c2e2891b7bd","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":null,"chain":"base","payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"5000","scheme":"exact","network":"eip155:8453","maxTimeoutSeconds":300},{"asset":"EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v","extra":{"feePayer":"8wLKe8H59eni5DmERU27GiRHGnN9fogRoq9yNqyKKNJA"},"payTo":"4HVvnhyXTkMnPbMBo9r3kfvYhzW4JSbLGdXg9SkUcVSe","amount":"5000","scheme":"exact","network":"solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp","maxTimeoutSeconds":300},{"asset":"0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20","extra":{"name":"USD Coin","version":"1"},"payTo":"0xD34411a70EffbDd000c529bbF572082ffDcF1794","amount":"5000","scheme":"exact","network":"eip155:1187947933","maxTimeoutSeconds":300},{"asset":"USDC","extra":{"symbol":"USDC","nodeUrl":"https://api.keeta.com","decimals":6,"serverAddress":"keeta_aabwgiqyij4scwktdoczzvhpi33btieeses5sezeqzqmpi5ik76ttyegwuvfsai","permissionSetupUrl":"/api/v1/keeta/setup-permission"},"payTo":"keeta_aabaolle2k3hceayy4vkyw7smgl35o5wbqeebt2fibyx5sxxodneqb2rmwqkjci","amount":"5000","scheme":"keeta-usdc","network":"keeta:main","expiresAt":1771370260743,"paymentId":"f19782ba-8237-4d99-93b4-1d9957a77d28","amountHuman":"0.005000","description":"Current gas prices on Base chain","tokenAddress":"keeta_amnkge74xitii5dsobstldatv3irmyimujfjotftx7plaaaseam4bntb7wnna","maxTimeoutSeconds":300,"requiresPermission":true}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:34.273Z"}],"sources":[{"listingId":"21bf4650-f0d9-4c3b-bc61-9c2e2891b7bd","source":"x402_bazaar","sourceId":"https://silverback-x402.onrender.com/api/v1/gas-price","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:34.273Z","lastSeenAt":"2026-04-22T04:02:49.638Z"}],"details":{"listingId":"21bf4650-f0d9-4c3b-bc61-9c2e2891b7bd","quickStartSnippet":"# Attempt to call the gas-price endpoint (may return 404 — see warnings)\ncurl -X GET https://silverback-x402.onrender.com/api/v1/gas-price\n# If live, expect a 402 challenge; pay via x402 and resend with payment proof header.","exampleRequest":null,"exampleResponse":null,"schema":null,"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Silverback provides 11 pay-per-use intelligence and execution endpoints via x402 micropayments with USDC on Base, Solana, and SKALE.","source_url":"https://silverback-x402.onrender.com"},{"claim":"The OpenAPI spec lists 11 endpoints but does not include /api/v1/gas-price.","source_url":"https://silverback-x402.onrender.com"},{"claim":"The canonical server URL in the OpenAPI spec is x402.silverbackdefi.app.","source_url":"https://silverback-x402.onrender.com"},{"claim":"Pricing ranges from $0.01 to $0.05 per call across the documented endpoints.","source_url":"https://silverback-x402.onrender.com"}],"useCases":["Estimating gas costs before submitting on-chain transactions","Comparing gas prices across chains for optimal execution timing","Integrating gas price feeds into autonomous DeFi agent workflows"],"bestFor":["AI agents needing on-chain gas cost data via micropayments","DeFi applications requiring pay-per-use gas price lookups","Autonomous trading bots optimizing transaction timing"],"notFor":["Free gas price data (this is a paid endpoint)","Non-crypto applications with no need for blockchain gas data"],"kindDetails":{},"updatedAt":"2026-04-22T01:07:53.924Z"}}