ToolVet
75trust / 100

Chat Nano

by OmniProvider in Onchain & crypto

x402 APIPassing, checked 4 h ago

Pay-per-call chat completion on the nano tier. One request returns one assistant message, limited to 1000 input and 256 output tokens, at 0.006 USDC per call on Base. Payment settles after the response is produced. A client nonce header makes a retry free of a second charge.

POST
https://pay.omnidev.tech/x402/chat-nano
Price
$0.006
per call in USDC
Uptime
100%
last 30 days
Response time
484 ms
1.0 s slowest 5%
Last check
Passed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://pay.omnidev.tech/x402/chat-nano

Each call costs $0.006 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://pay.omnidev.tech/x402/chat-nano
content-type: application/json

{
  "max_tokens": 64,
  "messages": [
    {
      "content": "Summarize the x402 payment flow in one sentence.",
      "role": "user"
    }
  ]
}

Parameters

ParameterTypeRequiredDescription
max_tokensintegerNoUpper bound on output tokens.
messagesarray of objectNoConversation, oldest first.
modelstringNoauto selects the tier model. One of: auto, llama-3.1-8b, kimi-k3.
promptstringNoShorthand for one user message; used when messages is absent.

Example response

The provider's example. We can't check it without paying.

{
  "ok": true,
  "result": {
    "choices": [
      {
        "finish_reason": "stop",
        "index": 0,
        "message": {
          "content": "A server answers 402 with payment requirements, the client signs a payment, and the server settles it after serving.",
          "role": "assistant"
        }
      }
    ],
    "id": "chatcmpl-example",
    "model": "auto",
    "object": "chat.completion",
    "usage": {
      "completion_tokens": 24,
      "prompt_tokens": 18,
      "total_tokens": 42
    }
  },
  "settled": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.006.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://pay.omnidev.tech/x402/chat-nano' \
  -H 'content-type: application/json' \
  --data-raw '{"max_tokens":64,"messages":[{"content":"Summarize the x402 payment flow in one sentence.","role":"user"}]}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://pay.omnidev.tech/x402/chat-nano' \
  -H 'content-type: application/json' \
  --data-raw '{"max_tokens":64,"messages":[{"content":"Summarize the x402 payment flow in one sentence.","role":"user"}]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.006 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.006" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.006 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fpay.omnidev.tech%2Fx402%2Fchat-nano&method=POST
const res = await pay("https://pay.omnidev.tech/x402/chat-nano", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "max_tokens": 64,
    "messages": [
      {
        "content": "Summarize the x402 payment flow in one sentence.",
        "role": "user"
      }
    ]
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.006 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.006"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://pay.omnidev.tech/x402/chat-nano",
        json={
            "max_tokens": 64,
            "messages": [
                {
                    "content": "Summarize the x402 payment flow in one sentence.",
                    "role": "user",
                },
            ],
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402460 ms$0.006
9 h agoPassed402465 ms$0.006
14 h agoPassed402480 ms$0.006
19 h agoPassed402500 ms$0.006
24 h agoPassed402484 ms$0.006
Show 2 older checks
29 h agoPassed4021.0 s$0.006
34 h agoPassed402594 ms$0.006