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by ARBITER in Other

x402 APIPassing, checked 2 h ago

ARBITER deterministic semantic control-flow and arbitration: measure and rank a fixed candidate field against current state, intent, or perspective.

POST
https://api.grip.fyi/v1/compare
Price
$0.001
per call in USDC
Uptime
97.4%
last 30 days
Response time
917 ms
2.4 s slowest 5%
Last check
Passed
2 h ago, next any minute now

Run a free test callHow to call it

Reliability

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

How to call it

POST https://api.grip.fyi/v1/compare

Each call costs $0.001 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://api.grip.fyi/v1/compare
content-type: application/json

{
  "candidates": [
    "inspect failure and repair deployment",
    "deploy anyway",
    "delete test suite"
  ],
  "query": "choose the coherent action",
  "top_k": 3
}

Parameters

ParameterTypeRequiredDescription
candidatesarray of stringYesFixed candidate field to measure and rank.
querystringYesCurrent state, intent, question, or perspective.
top_kintegerNo Default: 3.

Example response

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

Example response, 31 lines
{
  "all": [
    {
      "score": 0.7804905176,
      "text": "inspect failure and repair deployment"
    },
    {
      "score": 0.5035988092,
      "text": "deploy anyway"
    },
    {
      "score": 0.4872784615,
      "text": "delete test suite"
    }
  ],
  "query": "choose the coherent action",
  "top": [
    {
      "score": 0.7804905176,
      "text": "inspect failure and repair deployment"
    },
    {
      "score": 0.5035988092,
      "text": "deploy anyway"
    },
    {
      "score": 0.4872784615,
      "text": "delete test suite"
    }
  ]
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.001.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.grip.fyi/v1/compare' \
  -H 'content-type: application/json' \
  --data-raw '{"candidates":["inspect failure and repair deployment","deploy anyway","delete test suite"],"query":"choose the coherent action","top_k":3}'

# 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://api.grip.fyi/v1/compare' \
  -H 'content-type: application/json' \
  --data-raw '{"candidates":["inspect failure and repair deployment","deploy anyway","delete test suite"],"query":"choose the coherent action","top_k":3}' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.grip.fyi%2Fv1%2Fcompare&method=POST
const res = await pay("https://api.grip.fyi/v1/compare", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "candidates": [
      "inspect failure and repair deployment",
      "deploy anyway",
      "delete test suite"
    ],
    "query": "choose the coherent action",
    "top_k": 3
  }),
});
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.grip.fyi/v1/compare",
        json={
            "candidates": [
                "inspect failure and repair deployment",
                "deploy anyway",
                "delete test suite",
            ],
            "query": "choose the coherent action",
            "top_k": 3,
        },
    )
    print(res.status_code, res.text)

Security scan

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2 h agoPassed402784 ms$0.001
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29 h agoPassed402917 ms$0.001
34 h agoPassed402675 ms$0.001
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44 h agoPassed4021.0 s$0.001
2 days agoPassed4022.6 s$0.001
2 days agoPassed402752 ms$0.001
2 days agoPassed402681 ms$0.001
3 days agoPassed402707 ms$0.001
3 days agoPassed402792 ms$0.001
3 days agoPassed402974 ms$0.001

History

11 Oct 2026Price changed from $0.01 to $0.001