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Onchain Evidence
x402
Onchain Evidence is a paid API for AI agents from phion.systems, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).
Captures public blockchain explorer or RPC data as immutable evidence with cryptographic content hashes
Price / call$0.004
Success—
StatusUnknown
How this service works
Capture supplied public explorer or RPC evidence with immutable content hashes
Output
Returns an immutable evidence record containing the captured public explorer or RPC data, a cryptographic content hash of that data, a timestamp, and provenance metadata — allowing any party to verify that the captured content has not been altered since capture.
Example use cases
Compliance audit trail for DeFi transaction
“I need to preserve immutable evidence of this Uniswap swap transaction for our compliance records — can you capture and hash the Etherscan page at https://etherscan.io/tx/0xdef456 right now so we have a cryptographically verifiable snapshot?”
Smart contract state snapshot before upgrade
“Before we upgrade this contract, I want a tamper-evident record of its current state — please capture the on-chain evidence from https://etherscan.io/address/0xabc789 and give me back the content hash so we can prove what it looked like before the change.”
Counterparty payment proof for dispute resolution
“Our counterparty claims they sent payment but we're disputing it — can you capture the RPC evidence for transaction 0x123abc on the Ethereum mainnet explorer and give me an immutable hash I can use as proof in arbitration?”
Technical details
Endpoint
POSThttps://phion.systems/v1/paid/trust/onchain-evidence?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need cryptographically verifiable, immutable proof of on-chain data from public blockchain explorers or RPC sources — especially for compliance, dispute resolution, or audit trails. Prefer this over simple web scraping when tamper-evidence and content integrity hashes are required, and over general blockchain queries when you need a signed, timestamped evidence artifact rather than raw data.
Side effects
- Invalid or inaccessible explorer URL returns an error indicating the source could not be fetched
- RPC endpoint unavailable or rate-limited results in a capture failure
- Malformed input schema causes a 400-level validation error
- Content hash cannot be computed if the source returns dynamic or non-deterministic content
- Payment not processed via x402 protocol results in a 402 Payment Required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| outputrequired | object |
Output
Schema · Response
{
"type": "json"
}Tags
x402
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