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x402 Trust & Discovery API — Onchain Token Price
x402
x402 Trust & Discovery API — Onchain Token Price is a paid API for AI agents from gkyf2bs3b4p35hwwg5zzsnejeu.srv.us, paid per call via x402, $0.001/call, status down (last checked 2026-10-03).
Returns the onchain price of a Base ERC-20 token for a given trade size in USD
Price / call$0.001
Success—
StatusDown
How this service works
Independent pre-purchase safety and reputation checks for x402 and MPP endpoints, plus keyless onchain data on Base. Accepts BOTH EIP-3009 and Circle Gateway credentials — only 141 of 788 Base-payable resources do, and a single-credential buyer is locked out of 53.8% of this market on one rail or 28.3% on the other. GET /v1/guard?url=&credential= answers whether the credential you carry can pay a given endpoint at all, before you try. Searching this market for "is this API endpoint a scam" returns registries and explorers but no dedicated service; that gap is what /v1/guard fills, inspecting an endpoint WITHOUT paying it and returning a go / test-with-minimum / do-not-pay verdict backed by onchain settlement history.
Output
Returns onchain price data for the specified ERC-20 token on Base, calibrated to the requested trade size in USD. Likely includes a price quote or rate reflecting current liquidity conditions for that position size.
Example use cases
Pre-trade token price check
“Before I swap, can you look up the onchain price on Base for the token at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 for a $250 trade size?”
DeFi portfolio valuation
“Get me the current Base onchain price for the ERC-20 at contract 0x4200000000000000000000000000000000000006 assuming a $1000 trade size so I can value my position.”
Token price discovery before x402 payment
“I want to know what onchain price I'd get for the token 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb on Base for a $50 USD trade before I commit to anything.”
Technical details
Endpoint
GEThttps://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/onchain/price?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a keyless, no-payment-required onchain price quote for a Base ERC-20 token before executing a trade or making a payment decision. It is particularly useful in x402 agent workflows where you want to understand token value without committing funds. Prefer this over DEX APIs when you want a simple REST-based price lookup with no wallet interaction.
Side effects
- Invalid or non-existent ERC-20 contract address returns an error
- Token with no onchain liquidity on Base cannot be priced
- Trade size of zero or negative value may be rejected
- Endpoint unavailable or server error returns non-200 response
- Stale or low-liquidity token may return inaccurate quote
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| size | number | Trade size in USD to quote at. Defaults to 100. |
| token | string | ERC-20 contract address on Base to price. |
Output
Schema · Response
{
"type": "json",
"example": {}
}Tags
x402
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