Verify the contract at a known block.
Read code, token metadata and EIP-1967 proxy storage directly from Base. Available GoPlus checks add attributed security signals.
Evidence API · Base network
Before your agent
acts, get the facts.
Block-tagged contract evidence and available security and liquidity checks in one structured response. Built for agents that need to check a Base token before their next move.
x402 v2 $0.01 per token · Base USDC · No API key
One request. Verifiable evidence.STRUCTURE PREVIEW
{
"network": "Base",
"onchain": { /* Base block + code + metadata */ },
"liquidity": { /* GeckoTerminal pools */ },
"price_comparison": { /* Available market observations */ },
"sources": [ ... ],
"flags": [ ... ]
}
Public data. Clear provenance.
Base RPCGoPlusGeckoTerminalContract provenance
01 / The evidence
Less guesswork. More context.
Check the signals an agent needs, without stitching together three different data formats.
See the market behind the token.
Inspect pool-level liquidity from GeckoTerminal when covered. Missing or throttled market data remains explicitly unavailable.
Know where the evidence stops.
See available and unknown checks alongside their exact sources and timestamps. A missing flag does not establish that a token is safe.
02 / Pay per request
A small check before a big decision.
No subscription or API key. A buyer-authorized agent pays with USDC on Base through native x402.
One token
Base$0.01USDC / report
GET
/v1/base/token?address=0x…Contract evidence with available security and liquidity signals for one Base token.
A small batch
Up to 3 tokens$0.03USDC / request
GET
/v1/base/batch?addresses=0x…,0x…,0x…Compare up to three token addresses in one paid request. The batch price is fixed.
Payments configured. Inspect the challenge for the exact amount, network, and recipient before authorizing a payment.
03 / Try the protocol
See what your agent will see.
Inspect an unpaid request in your browser. Read the server's payment requirement, or load the free static sample.
- Request the evidence.Send a Base token address to the API.
- Review the payment challenge.A configured service returns HTTP 402 with x402 payment requirements.
- Authorize through your own client.Your buyer-authorized wallet signs the payment and retries the request.
Inspect a token request No payment
No wallet connection. No signing. No funds moved.
RESPONSE
04 / Agent integration
Built to be read by machines.
Start with the schema or sample. Let your agent discover the service and keep payment authorization in your own client.
# Inspect the payment requirement. This request does not pay.
curl -i 'https://agentproof-base.softcreek2.chatgpt.site/v1/base/token?address=0x4200000000000000000000000000000000000006'
# Read a static example for free.
curl 'https://agentproof-base.softcreek2.chatgpt.site/v1/sample'// npm install @x402/fetch@3.0.8
import { wrapFetchWithPayment } from "@x402/fetch";
import { client } from "./authorized-x402-client.js";
// client is your buyer-authorized, budget-limited x402 client.
const paidFetch = wrapFetchWithPayment(fetch, client);
const response = await paidFetch(
"https://agentproof-base.softcreek2.chatgpt.site/v1/base/token?address=0x4200000000000000000000000000000000000006"
);
if (!response.ok) throw new Error("Report request failed");
const evidence = await response.json();# Machine-readable service descriptions
https://agentproof-base.softcreek2.chatgpt.site/llms.txt
https://agentproof-base.softcreek2.chatgpt.site/openapi.json
https://agentproof-base.softcreek2.chatgpt.site/.well-known/x402
# Streamable HTTP MCP endpoint
https://agentproof-base.softcreek2.chatgpt.site/mcp
# Free health and example responses
https://agentproof-base.softcreek2.chatgpt.site/health
https://agentproof-base.softcreek2.chatgpt.site/v1/sampleEndpointPurposePrice
GET /v1/base/tokenOne address via the address query parameter.
GET /v1/base/batchUp to three comma-separated addresses.
GET /v1/sampleA static, labeled example of a report response.
FreeGET /healthService and payment-configuration status.
FreeGET /openapi.jsonRequest parameters and response schemas.
FreePOST /mcpStreamable HTTP MCP discovery and tools.
See toolEvidence, with its limits.
A report helps your agent ask better questions.
Public token data is an input to a decision. It cannot establish that a token is safe, liquid enough for your trade, or likely to appreciate.
Unknown means unknown.
Source gaps, stale data, and upstream failures must be considered alongside the evidence. A missing flag is not a clean bill of health.
Keep authority with the buyer.
Programmatic payments require a buyer-authorized wallet. Set spending limits and inspect the recipient, network, and amount before signing.
Use the schema as the contract.
The terminal above shows structure only. The free sample is static. Use the OpenAPI specification and API responses for integration details.