Route: gas
Say what you need in plain words. You get back the paid API that buyers actually pay for and that answers right now. It comes with the exact request to send and that seller's payment terms, read seconds ago, so you can pay with your first request. Free: no key, no account.
The answer
api.onesource.io
Estimate the gas a transaction will consume via eth_estimateGas before signing it
POST https://api.onesource.io/api/chain/estimate-gas · 0.004 USD · base
144 different buyers paid this exact route 144 times in the last 30 days (Coinbase CDP catalogue), last on 2026-10-25; answered a valid x402 402 to our check 1 s before this answer, in 11 ms
Payment terms (sign and send with the first request)
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "4000",
"maxAmountRequired": "4000",
"payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
"recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
"maxTimeoutSeconds": 3600,
"extra": {
"credentialTypes": [
"authorization"
],
"name": "USD Coin",
"version": "2"
}
},
{
"scheme": "batch-settlement",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "4000",
"maxAmountRequired": "4000",
"payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
"recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
"maxTimeoutSeconds": 3600,
"extra": {
"name": "USD Coin",
"receiverAuthorizer": "0x11dF9F6280632aB8F12926b3f569E493EaEcf81b",
"version": "2",
"withdrawDelay": 86400
}
}
]Alternative 1
base-gas-x402
base-gas-x402: Current gas price on Base and what a transaction costs in USD right now: ba
GET https://base-gas-x402-production.up.railway.app/gas · 0.002 USD · base
13 different buyers paid this exact route 653 times in the last 30 days (Coinbase CDP catalogue), last on 2026-10-25; answered a valid x402 402 to our check 1 s before this answer, in 216 ms
Payment terms (sign and send with the first request)
[
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "2000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x0D083590c048A243e24a75E3a7C968145DE25B44",
"maxTimeoutSeconds": 300,
"extra": {
"name": "USD Coin",
"version": "2"
}
}
]Alternative 2
api.x402node.dev
Live gas price across Base, Ethereum, Arbitrum, Optimism, Polygon and BSC sorted cheapest
GET https://api.x402node.dev/chain/gas-compare · 0.005 USD · base
20 different buyers paid this exact route 105 times in the last 30 days (Coinbase CDP catalogue), last on 2026-10-25; answered a valid x402 402 to our check 1 s before this answer, in 142 ms
Payment terms (sign and send with the first request)
[
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "5000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x4466d4A84b7c49a6A094ec6eef4a0712D6dd125e",
"maxTimeoutSeconds": 300,
"extra": {
"name": "USD Coin",
"version": "2"
}
},
{
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"amount": "5000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"payTo": "9urRvUx69HqAopg1JGV9P9wR7JdKoztzdkuNyJ8Eo1up",
"maxTimeoutSeconds": 300,
"extra": {
"feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww"
}
}
]Alternative 3
api.x402node.dev
Live gas oracle with slow, standard and fast fee tiers computed from recent block fee hist
GET https://api.x402node.dev/chain/gas-oracle · 0.006 USD · base
20 different buyers paid this exact route 101 times in the last 30 days (Coinbase CDP catalogue), last on 2026-10-25; answered a valid 402 at the census probe (2026-09-30)
Payment terms (sign and send with the first request)
[
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "6000",
"payTo": "0x4466d4A84b7c49a6A094ec6eef4a0712D6dd125e",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"maxTimeoutSeconds": 300,
"extra": {
"name": "USD Coin",
"version": "2"
}
}
]Alternative 4
ApiToll Base Gas Oracle
ApiToll Base Gas Oracle: Base gas oracle / gas price API for AI agents and bots — get the
GET https://gas.apitoll.cloud/v1/base/gas · 0.001 USD · base
14 different buyers paid this exact route 16 times in the last 30 days (Coinbase CDP catalogue), last on 2026-10-24; answered a valid 402 at the census probe (2026-09-30)
Payment terms (sign and send with the first request)
[
{
"scheme": "exact",
"network": "eip155:8453",
"amount": "1000",
"payTo": "0xcc69d619E6053F88A4845066518f465bD06Fc96c",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"maxTimeoutSeconds": 300,
"extra": {
"name": "USD Coin",
"version": "2"
}
}
]Only routes that answered a valid x402 402 at our census probe; the top three are checked again at answer time and one that answers goes first. Order: how well the route's own description matches your words, then distinct buyers of that exact route in 30 days and its calls (Coinbase CDP catalogue), paid in the last 7 days, input schema published, then lower price. Paid placement never changes this order; it shows only under sponsored.
Sponsored (paid placement, not ranked): Foundations Elements
For agents
GET https://bazaar.agentexchange.work/route.json?need=bitcoin%20price or POST https://bazaar.agentexchange.work/route {"need":"..."}, or the MCP tool route at https://bazaar.agentexchange.work/mcp. Optional filters: max_price_usd, network.
What buyers pay for most (30 days)
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