78trust / 100

Context State Ping

by nova-retail-controlled-proof.onrender.com in Other

x402 APIPassing, checked 12 min ago

Nova retail state_ping context resource

POST

https://nova-retail-controlled-proof.onrender.com/retail/v1/context/state-ping

Price: $0.002; per call in USDC
Uptime: 100%; last 30 days
Response time: 316 ms; 851 ms slowest 5%
Last check: Passed; 12 min ago, next in 17 min

Run a free test call How 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://nova-retail-controlled-proof.onrender.com/retail/v1/context/state-ping

Each call costs $0.002 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://nova-retail-controlled-proof.onrender.com/retail/v1/context/state-ping
content-type: application/json

{
  "generated_at": "2026-09-09T20:00:00Z",
  "observations": [
    {
      "authority_effect": "none",
      "claims": [
        {
          "claim_id": "market_pair_last_price",
          "claim_or_observation": "last_price=100000 BTC-USD",
          "claim_status": "observed"
        }
      ],
      "freshness_input": {
        "derivation_status": "derived_from_timestamps",
        "source_age_seconds": 0
      },
      "integrity": {
        "algorithm": "sha256",
        "digest": "c5df653ec6f407c32fdca147310a463c471999aee6839ee35e6d418eb7c2669b",
        "scope": "normalized_claims",
        "trust_semantics": "content_identity_only"
      },
      "limitations": [
        {
          "description": "Example source observation; authority remains source-scoped.",
          "impact": "limited_scope",
          "limitation_id": "example-source-scope"
        }
      ],
      "observation_id": "external-example-observation",
      "observed_at": "2026-09-09T20:00:00Z",
      "provenance": {
        "normalization_version": "0.1.0",
        "provider_observation_reference": "provider-reference-example",
        "retrieval_mode": "provider_adapter",
        "verification_basis": "not_verified"
      },
      "received_at": "2026-09-09T20:00:00Z",
      "schema_version": "0.1.0",
      "source_id": "coinbase_exchange_ticker",
      "source_status": "observed",
      "subject": {
        "label": "BTC/USD",
        "subject_id": "BTC-USD",
        "subject_type": "market_pair"
      },
      "verification_status": "unverified"
    }
  ],
  "subject": {
    "label": "BTC/USD",
    "subject_id": "BTC-USD",
    "subject_type": "market_pair"
  }
}

Parameters

Parameter	Type	Required
`generated_at`	string (date-time)	Yes
`observations`	array of publicSourceObservation	Yes
`subject`	subject	Yes

Example response

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

{
  "authority_effect": "none",
  "context_status": "partially_resolved",
  "contradictions": [],
  "evidence": [],
  "limitations": [],
  "provenance": [],
  "resource_type": "state_ping",
  "unresolved_evidence": []
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://nova-retail-controlled-proof.onrender.com/retail/v1/context/state-ping' \
  -H 'content-type: application/json' \
  --data-raw '{"generated_at":"2026-09-09T20:00:00Z","observations":[{"authority_effect":"none","claims":[{"claim_id":"market_pair_last_price","claim_or_observation":"last_price=100000 BTC-USD","claim_status":"observed"}],"freshness_input":{"derivation_status":"derived_from_timestamps","source_age_seconds":0},"integrity":{"algorithm":"sha256","digest":"c5df653ec6f407c32fdca147310a463c471999aee6839ee35e6d418eb7c2669b","scope":"normalized_claims","trust_semantics":"content_identity_only"},"limitations":[{"description":"Example source observation; authority remains source-scoped.","impact":"limited_scope","limitation_id":"example-source-scope"}],"observation_id":"external-example-observation","observed_at":"2026-09-09T20:00:00Z","provenance":{"normalization_version":"0.1.0","provider_observation_reference":"provider-reference-example","retrieval_mode":"provider_adapter","verification_basis":"not_verified"},"received_at":"2026-09-09T20:00:00Z","schema_version":"0.1.0","source_id":"coinbase_exchange_ticker","source_status":"observed","subject":{"label":"BTC/USD","subject_id":"BTC-USD","subject_type":"market_pair"},"verification_status":"unverified"}],"subject":{"label":"BTC/USD","subject_id":"BTC-USD","subject_type":"market_pair"}}'

# 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://nova-retail-controlled-proof.onrender.com/retail/v1/context/state-ping' \
  -H 'content-type: application/json' \
  --data-raw '{"generated_at":"2026-09-09T20:00:00Z","observations":[{"authority_effect":"none","claims":[{"claim_id":"market_pair_last_price","claim_or_observation":"last_price=100000 BTC-USD","claim_status":"observed"}],"freshness_input":{"derivation_status":"derived_from_timestamps","source_age_seconds":0},"integrity":{"algorithm":"sha256","digest":"c5df653ec6f407c32fdca147310a463c471999aee6839ee35e6d418eb7c2669b","scope":"normalized_claims","trust_semantics":"content_identity_only"},"limitations":[{"description":"Example source observation; authority remains source-scoped.","impact":"limited_scope","limitation_id":"example-source-scope"}],"observation_id":"external-example-observation","observed_at":"2026-09-09T20:00:00Z","provenance":{"normalization_version":"0.1.0","provider_observation_reference":"provider-reference-example","retrieval_mode":"provider_adapter","verification_basis":"not_verified"},"received_at":"2026-09-09T20:00:00Z","schema_version":"0.1.0","source_id":"coinbase_exchange_ticker","source_status":"observed","subject":{"label":"BTC/USD","subject_id":"BTC-USD","subject_type":"market_pair"},"verification_status":"unverified"}],"subject":{"label":"BTC/USD","subject_id":"BTC-USD","subject_type":"market_pair"}}' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fnova-retail-controlled-proof.onrender.com%2Fretail%2Fv1%2Fcontext%2Fstate-ping&method=POST
const res = await pay("https://nova-retail-controlled-proof.onrender.com/retail/v1/context/state-ping", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "generated_at": "2026-09-09T20:00:00Z",
    "observations": [
      {
        "authority_effect": "none",
        "claims": [
          {
            "claim_id": "market_pair_last_price",
            "claim_or_observation": "last_price=100000 BTC-USD",
            "claim_status": "observed"
          }
        ],
        "freshness_input": {
          "derivation_status": "derived_from_timestamps",
          "source_age_seconds": 0
        },
        "integrity": {
          "algorithm": "sha256",
          "digest": "c5df653ec6f407c32fdca147310a463c471999aee6839ee35e6d418eb7c2669b",
          "scope": "normalized_claims",
          "trust_semantics": "content_identity_only"
        },
        "limitations": [
          {
            "description": "Example source observation; authority remains source-scoped.",
            "impact": "limited_scope",
            "limitation_id": "example-source-scope"
          }
        ],
        "observation_id": "external-example-observation",
        "observed_at": "2026-09-09T20:00:00Z",
        "provenance": {
          "normalization_version": "0.1.0",
          "provider_observation_reference": "provider-reference-example",
          "retrieval_mode": "provider_adapter",
          "verification_basis": "not_verified"
        },
        "received_at": "2026-09-09T20:00:00Z",
        "schema_version": "0.1.0",
        "source_id": "coinbase_exchange_ticker",
        "source_status": "observed",
        "subject": {
          "label": "BTC/USD",
          "subject_id": "BTC-USD",
          "subject_type": "market_pair"
        },
        "verification_status": "unverified"
      }
    ],
    "subject": {
      "label": "BTC/USD",
      "subject_id": "BTC-USD",
      "subject_type": "market_pair"
    }
  }),
});
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://nova-retail-controlled-proof.onrender.com/retail/v1/context/state-ping",
        json={
            "generated_at": "2026-09-09T20:00:00Z",
            "observations": [
                {
                    "authority_effect": "none",
                    "claims": [
                        {
                            "claim_id": "market_pair_last_price",
                            "claim_or_observation": "last_price=100000 BTC-USD",
                            "claim_status": "observed",
                        },
                    ],
                    "freshness_input": {
                        "derivation_status": "derived_from_timestamps",
                        "source_age_seconds": 0,
                    },
                    "integrity": {
                        "algorithm": "sha256",
                        "digest": "c5df653ec6f407c32fdca147310a463c471999aee6839ee35e6d418eb7c2669b",
                        "scope": "normalized_claims",
                        "trust_semantics": "content_identity_only",
                    },
                    "limitations": [
                        {
                            "description": "Example source observation; authority remains source-scoped.",
                            "impact": "limited_scope",
                            "limitation_id": "example-source-scope",
                        },
                    ],
                    "observation_id": "external-example-observation",
                    "observed_at": "2026-09-09T20:00:00Z",
                    "provenance": {
                        "normalization_version": "0.1.0",
                        "provider_observation_reference": "provider-reference-example",
                        "retrieval_mode": "provider_adapter",
                        "verification_basis": "not_verified",
                    },
                    "received_at": "2026-09-09T20:00:00Z",
                    "schema_version": "0.1.0",
                    "source_id": "coinbase_exchange_ticker",
                    "source_status": "observed",
                    "subject": {
                        "label": "BTC/USD",
                        "subject_id": "BTC-USD",
                        "subject_type": "market_pair",
                    },
                    "verification_status": "unverified",
                },
            ],
            "subject": {
                "label": "BTC/USD",
                "subject_id": "BTC-USD",
                "subject_type": "market_pair",
            },
        },
    )
    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

When	Result	HTTP	Time	Price
12 min ago	Passed	402	358 ms	$0.002
4 h ago	Passed	402	287 ms	$0.002
8 h ago	Passed	402	288 ms	$0.002
12 h ago	Passed	402	365 ms	$0.002
16 h ago	Passed	402	348 ms	$0.002

Show 10 older checks

20 h ago	Passed	402	338 ms	$0.002
23 h ago	Passed	402	310 ms	$0.002
26 h ago	Passed	402	287 ms	$0.002
29 h ago	Passed	402	839 ms	$0.002
32 h ago	Passed	402	473 ms	$0.002
36 h ago	Passed	402	300 ms	$0.002
39 h ago	Passed	402	286 ms	$0.002
42 h ago	Passed	402	285 ms	$0.002
46 h ago	Passed	402	757 ms	$0.002
2 days ago	Passed	402	335 ms	$0.002

Trust score 78/ 100

Availability (30-day uptime)		30 / 30
Valid x402 challenge		15 / 15
Response time		7 / 10
Real paying agents (30 days)		6 / 15
Charges what it lists		10 / 10
Security scan		10 / 10
Verified owner		0 / 10

How the score works

Payment terms

Price: $0.002 per call
Listed at: $0.002
Token: USDC
Networks: Base
Pays to: 0xd764…D0E3

Real usage

Paying agents: 3 in 30 days
Paid calls: 3 in 30 days
Last paid call: 6 days ago

Source: x402 Bazaar settlement data.

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Trust score

[![ToolVet trust score](https://toolvet.app/badge/context-state-ping.svg)](https://toolvet.app/s/context-state-ping)