Route: erc20

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

ERC20 token balance for any Ethereum wallet - USDC, USDT, DAI, or any token - via balanceO

GET https://api.onesource.io/api/chain/erc20-balance · 0.003 USD · base

374 different buyers paid this exact route 379 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 16 ms

Payment terms (sign and send with the first request)

[
 {
  "scheme": "exact",
  "network": "eip155:8453",
  "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "amount": "3000",
  "maxAmountRequired": "3000",
  "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": "3000",
  "maxAmountRequired": "3000",
  "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "maxTimeoutSeconds": 3600,
  "extra": {
   "name": "USD Coin",
   "receiverAuthorizer": "0x11dF9F6280632aB8F12926b3f569E493EaEcf81b",
   "version": "2",
   "withdrawDelay": 86400
  }
 }
]

census record · seller

Alternative 1

api.onesource.io

ERC20 Transfer logs via eth_getLogs - raw Transfer events for a token or wallet

GET https://api.onesource.io/api/chain/erc20-transfers · 0.005 USD · base

261 different buyers paid this exact route 264 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 16 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

api.onesource.io

Live wallet balance - native ETH plus up to 20 caller-supplied ERC20 tokens in one bounded

GET https://api.onesource.io/api/chain/live-balance · 0.003 USD · base

300 different buyers paid this exact route 300 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 16 ms

Payment terms (sign and send with the first request)

[
 {
  "scheme": "exact",
  "network": "eip155:8453",
  "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "amount": "3000",
  "maxAmountRequired": "3000",
  "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": "3000",
  "maxAmountRequired": "3000",
  "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "recipient": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "maxTimeoutSeconds": 3600,
  "extra": {
   "name": "USD Coin",
   "receiverAuthorizer": "0x11dF9F6280632aB8F12926b3f569E493EaEcf81b",
   "version": "2",
   "withdrawDelay": 86400
  }
 }
]

census record · seller

Alternative 3

api.onesource.io

Total supply of an ERC20 or ERC721 token contract via totalSupply (eth_call)

GET https://api.onesource.io/api/chain/total-supply · 0.003 USD · base

243 different buyers paid this exact route 243 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": "3000",
  "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "maxTimeoutSeconds": 3600,
  "extra": {
   "name": "USD Coin",
   "version": "2"
  }
 }
]

census record · seller

Alternative 4

api.onesource.io

ERC20 allowance via allowance (eth_call) - how much a spender is approved to move from an

GET https://api.onesource.io/api/chain/allowance · 0.003 USD · base

138 different buyers paid this exact route 141 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": "3000",
  "payTo": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
  "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "maxTimeoutSeconds": 3600,
  "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