Route: transaction

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 27 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
  }
 }
]

census record · seller

Alternative 1

api.onesource.io

Simulate a read-only Ethereum contract call via eth_call - no transaction sent

POST https://api.onesource.io/api/chain/call · 0.005 USD · base

137 different buyers paid this exact route 137 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 27 ms

Payment terms (sign and send with the first request)

[
 {
  "scheme": "exact",
  "network": "eip155:8453",
  "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "amount": "5000",
  "maxAmountRequired": "5000",
  "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": "5000",
  "maxAmountRequired": "5000",
  "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "maxTimeoutSeconds": 3600,
  "extra": {
   "name": "USD Coin",
   "receiverAuthorizer": "0x11dF9F6280632aB8F12926b3f569E493EaEcf81b",
   "version": "2",
   "withdrawDelay": 86400
  }
 }
]

census record · seller

Alternative 2

Nansen

Nansen: Get Address Transactions Data

POST https://api.nansen.ai/api/v1/profiler/address/transactions · 0.01 USD · base

32 different buyers paid this exact route 35 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 89 ms

Payment terms (sign and send with the first request)

[
 {
  "scheme": "exact",
  "network": "eip155:8453",
  "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "amount": "10000",
  "payTo": "0x93053f1e7A5eFEDa532Fe69CbbE43cBEc3A0F13f",
  "maxTimeoutSeconds": 300,
  "extra": {
   "name": "USD Coin",
   "version": "2"
  }
 },
 {
  "scheme": "exact",
  "network": "eip155:196",
  "asset": "0x779Ded0c9e1022225f8E0630b35a9b54bE713736",
  "amount": "10000",
  "payTo": "0x93053f1e7A5eFEDa532Fe69CbbE43cBEc3A0F13f",
  "maxTimeoutSeconds": 300,
  "extra": {
   "name": "USD₮0",
   "version": "1"
  }
 },
 {
  "scheme": "exact",
  "network": "eip155:56",
  "asset": "0xcE24439F2D9C6a2289F741120FE202248B666666",
  "amount": "10000000000000000",
  "payTo": "0x93053f1e7A5eFEDa532Fe69CbbE43cBEc3A0F13f",
  "maxTimeoutSeconds": 300,
  "extra": {
   "name": "United Stables",
   "version": "1",
   "assetTransferMethod": "eip3009",
   "signerAddress": "0x34F7a661160780Ce1346e6D7B96D2bE244590899"
  }
 }
]

census record · seller

Alternative 3

api.onesource.io

Pending block - transactions not yet mined, via eth_getBlockByNumber("pending")

GET https://api.onesource.io/api/chain/pending · 0.01 USD · base

52 different buyers paid this exact route 54 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": "10000",
  "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "maxTimeoutSeconds": 3600,
  "extra": {
   "name": "USD Coin",
   "version": "2"
  }
 }
]

census record · seller

Alternative 4

Pocket Network

Pocket Network: SEC Form 3, 4, and 5 insider transactions: filer, issuer, transaction date

POST https://agent.pocket.network/v1/insider-transactions · 0.005 USD · base

3 different buyers paid this exact route 76 times in the last 30 days (Coinbase CDP catalogue), last on 2026-10-24; answered a valid 402 at the census probe (2026-10-22)

Payment terms (sign and send with the first request)

[
 {
  "scheme": "exact",
  "network": "eip155:8453",
  "amount": "5000",
  "payTo": "0xF732ea490c5766071785a2310523f7fA2CEbB829",
  "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "maxTimeoutSeconds": 60,
  "extra": {
   "name": "USD Coin",
   "version": "2"
  }
 }
]

census record · seller

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)

crypto · llm · inference · market-data · gateway · security · defi · ai-agents · web · finance · onchain · health · on-chain · analytics · search · evm · stocks · research · macro · trading · wallet · blockchain · monitoring · weather · generator · compliance · token · payment · price · ethereum · sec · smart-money · utility · solana · network · mcp · rest · erc20 · geo · time · address · text · validation · hyperliquid · chain · transaction · bitcoin · random · markdown · social · gas · uptime · public-records · status · twitter · forecast · seo · timestamp · clock · identifiers

All needs