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Base Onchain Tools – Simulate Token Transfer
x402
Base Onchain Tools – Simulate Token Transfer is a paid API for AI agents from base-onchain-tools.dolerite.workers.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-13).
Simulates an ERC-20 or native token transfer on Base mainnet and returns whether it would succeed or revert, with the exact revert reason and a human-readable list of blockers.
Price / call$0.008
Success—
StatusUnknown
How this service works
Eleven read-only endpoints answering questions about Base mainnet that are tedious to assemble from raw RPC: what an unverified contract is actually able to do, whether a token transfer will revert and for what reason, what an arbitrary token is worth, and whether an address is safe to pay. Priced $0.001-$0.04 per call in USDC over x402. No account, no API key, no signup, no minimum, no rate limit to negotiate — the payTo address in the 402 response is the whole integration. Failed calls are not billed. The payment middleware cancels settlement on any 4xx or 5xx, so a malformed parameter or an upstream outage costs nothing. Answers are read live from Base mainnet at request time, with failover across five independent RPC providers. A batch that comes back incomplete is treated as a failure rather than returned with the missing entries as zeros, because a confident wrong answer costs a caller more than an error does. Scope is deliberately narrow: Base mainnet only, reads only, no keys held, nothing stored between requests.
Output
A JSON object with: `verdict` ('would-succeed' or 'would-fail'), `would_succeed` boolean, `revert` object containing `kind` (e.g. 'Error(string)') and `reason` (the revert message string), and `blockers` — a human-readable array explaining why the transfer would fail (e.g. insufficient balance, missing allowance). On success, `revert` and `blockers` will be absent or empty.
Example use cases
Pre-flight check before paying a vendor
“I'm about to send 250 USDC from my wallet 0xAbC...111 to the vendor at 0xDeF...222 on Base — can you simulate the transfer first and tell me if it'll go through, or what's blocking it?”
Diagnose a stuck delegated withdrawal
“My protocol is trying to pull 1000000 USDC (that's $1) from user address 0x111...aaa using spender 0x222...bbb on Base — simulate that transferFrom and tell me the exact revert reason so I can fix it.”
Validate a payment bot before deploying
“Before I turn on my auto-payment bot, simulate a transfer of 5000000 atomic units of the token at contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 from 0xBot...000 to 0xRecip...999 on Base and confirm it would succeed.”
Technical details
Endpoint
GEThttps://base-onchain-tools.dolerite.workers.dev/v1/base/simulate-transfer?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a cheap, reliable pre-flight check before submitting a token transfer on Base mainnet — especially in payment pipelines, bots, or user-facing UIs where a reverting transaction would waste gas or cause confusion. It is purpose-built for Base mainnet reads with no API key or account required, costs only $0.008 per call (billed only on success), and returns machine-parseable revert reasons plus human-readable blockers. Prefer it over raw eth_call simulation when you want structured, interpreted results rather than raw hex revert data.
Side effects
- Malformed or missing `from`, `to`, or `amount` parameters returns a 4xx error (not billed)
- Invalid ERC-20 contract address causes upstream call failure (not billed)
- Upstream RPC provider outage across all five providers causes a 5xx (not billed)
- Incomplete batch result treated as failure rather than partial data (not billed)
- Amount expressed in decimal instead of atomic units may produce misleading results (user error)
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"revert": {
"kind": "Error(string)",
"reason": "ERC20: transfer amount exceeds balance"
},
"verdict": "would-fail",
"blockers": [
"sender holds 0 USDC but is sending 1"
],
"would_succeed": false
}
}Tags
x402
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