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Tollex x402 Payment Simulation
x402
Tollex x402 Payment Simulation is a paid API for AI agents from api.tollex.org, paid per call via x402, $0.0079/call, status unknown (last checked 2026-10-11).
Simulates an x402 micropayment for a given URL and payer address, validating payment requirements and returning a signed receipt without executing a real transaction
Price / call$0.0079
Success—
StatusUnknown
How this service works
Tollex lets software agents buy APIs and tools under rules you set: it finds a capability that fits, checks your policy before anything is signed, pays with x402 in USDC on Base or USDG on Robinhood Chain, reconciles uncertain payments and returns a signed receipt.
Output
Returns a simulated payment outcome including validated payment requirements, reconciliation status, and a signed receipt — without debiting any real funds. Includes details such as the asset, amount, scheme, network, and whether the payment simulation succeeded or encountered a policy or parameter mismatch.
Example use cases
Preflight check before agent API purchase
“Before spending any real USDC, simulate the x402 payment from my wallet 0x1234567890abcdef1234567890abcdef12345678 to https://api.someservice.io/endpoint and tell me if the amount and network match what I expect.”
Policy compliance dry-run for autonomous agent
“My agent wants to buy a data API. Simulate the x402 payment to https://data.provider.com/v1/query from 0xDeAdBeEf00000000000000000000000000000001 with USDC on Base so I can check the payment requirements against my spending policy before it commits.”
Debugging a failed x402 payment flow
“An x402 payment to https://tools.merchant.xyz/search from wallet 0xFf00Ff00Ff00Ff00Ff00Ff00Ff00Ff00Ff00Ff00 keeps failing — can you simulate it and show me the signed receipt and any reconciliation details so I can figure out what's going wrong?”
Technical details
Endpoint
POSThttps://api.tollex.org/tools/x402_simulate_payment?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to preflight or dry-run an x402 micropayment before committing real funds — ideal for policy checks, debugging failed payment flows, or testing merchant compatibility. Prefer this over direct payment endpoints when you need a signed receipt for audit purposes without financial side effects, or when validating that payment parameters (asset, network, amount) align with a merchant's requirements before an agent autonomously purchases a capability.
Side effects
- Invalid payer address format (must be 0x-prefixed 40-char hex) returns a validation error
- Merchant URL returns no x402 payment requirements or is unreachable
- Payment amount or asset in requirements object does not match merchant expectations
- Network mismatch between specified network and merchant's accepted networks
- Timeout exceeded when fetching payment requirements from merchant URL
- Malformed requirements object causes schema validation failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | |
| payer | string | |
| requirements | object |
Output
Schema · Response
{
"type": "json",
"example": {
"tool": {
"id": "x402_simulate_payment",
"version": "1.0.0",
"provider": "tollex.robinhood-chain"
},
"result": {
"payer": "0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168",
"results": [
{
"amount": "7800",
"scheme": "exact",
"reasons": [],
"wouldSucceed": true
}
],
"gasSponsoredApprovalOffered": false
},
"evidence": [],
"untrustedOutput": false
}
}Tags
x402
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