Tax · x402 · early usage

Base chain status from Otto's configured RPC: latest, safe, finalized and pending heads…

by x402.ottoai.services · discovered, not yet claimed by its owner · updated 2026-10-12

30d calls13

30d payers6

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Base chain status from Otto's configured RPC: latest, safe, finalized and pending heads with validated mined block hashes; pending hash nullable and provisional. Public source ID, per-head observation times and retrieval window disclose non-atomic RPC reads. Base fee, congestion, finality lag and block age at observation, separate from cache staleness. Refreshed every minute. $0.001 per call.

Tags: chain status · base · block height · finality · base fee · bazaar · builder-code · offer-receipt · otto-content-receipt

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-12

Input example from Bazaar metadata

{}

Output example

{
  "data": {
    "blockAgeNote": "blockAgeSec is latest block age at latest.observedAt (seconds, floored and clamped to zero), not age...",
    "blockAgeSec": 3,
    "chain": "base",
    "chainId": 8453,
    "congestion": "low",
    "finalityLagBlocks": 474,
    "finalityLagSec": 948,
    "finalityNote": "Base is an OP-Stack L2: ~2s soft-confirmed blocks (latest), L2-safe once the sequencer batch is subm...",
    "finalized": {
      "baseFeePerGasGwei": 0.005,
      "baseFeePerGasWei": "5000000",
      "blockHash": "0x3333333333333333333333333333333333333333333333333333333333333333",
      "blockNumber": 50738081,
      "blockTimeIso": "2026-09-01T11:45:09.000Z",
      "blockTimestamp": 1788263109,
      "gasUsedRatio": 0.0825,
      "observedAt": "2026-09-01T12:01:00.200Z"
    },
    "generatedAt": "2026-09-01T12:01:00.400Z",
    "latest": {
      "baseFeePerGasGwei": 0.005,
      "baseFeePerGasWei": "5000000",
      "blockHash": "0x1111111111111111111111111111111111111111111111111111111111111111",
      "blockNumber": 50738555,
      "blockTimeIso": "2026-09-01T12:00:57.000Z",
      "blockTimestamp": 1788264057,
      "gasUsedRatio": 0.1088,
      "observedAt": "2026-09-01T12:01:00.000Z"
    },
    "pending": {
      "baseFeePerGasGwei": 0.005,
      "baseFeePerGasWei": "5000000",
      "blockHash": null,
      "blockNumber": 50738556,
      "blockTimeIso": "2026-09-01T12:00:59.000Z",
      "blockTimestamp": 1788264059,
      "gasUsedRatio": 0.0413,
      "hashStatus": "provisional",
      "note": "In-progress head; blockHash may be null or provisional and is never a finalized hash. An absent, mal...",
      "observedAt": "2026-09-01T12:01:00.300Z"
    },
    "pendingLeadBlocks": 1,
    "provenance": {
      "note": "Separate eth_getBlockByNumber calls, not an atomic snapshot or independent finality verification. Ea...",
      "observationMode": "non-atomic-rpc",
      "retrievalStartedAt": "2026-09-01T12:00:59.900Z",
      "retrievedAt": "2026-09-01T12:01:00.300Z",
      "sourceId": "base-mainnet-public-rpc"
    },
    "safe": {
      "baseFeePerGasGwei": 0.005,
      "baseFeePerGasWei": "5000000",
      "blockHash": "0x2222222222222222222222222222222222222222222222222222222222222222",
      "blockNumber": 50738532,
      "blockTimeIso": "2026-09-01T12:00:11.000Z",
      "blockTimestamp": 1788264011,
      "gasUsedRatio": 0.1893,
      "observedAt": "2026-09-01T12:01:00.100Z"
    }
  },
  "meta": {
    "degraded": false,
    "generatedAt": "",
    "stalenessSec": 0,
    "validUntil": ""
  },
  "status": "success"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/25855.json for the price and payment options.
Pay. Call GET https://x402.ottoai.services/chain-status. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.001 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Solana
Demand: 13 calls · 6 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.001	0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.001	6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x0E84dDEdAaE6A779c462C22a59F301EC31B6b808",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "6XcSfqJHr9vNW2vbiRaMqUYVm7shDgLepca54wUTDPN5",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000",
    "amountUsd": 0.001,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "data": {},
        "meta": {
          "type": "object"
        },
        "reason": {
          "description": "status=unavailable only; every >=400 is UNCHARGED",
          "type": "string"
        },
        "status": {
          "enum": [
            "success",
            "unavailable"
          ],
          "type": "string"
        }
      },
      "required": [
        "status"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {
    "data": null,
    "meta": {},
    "reason": "string",
    "status": "success"
  },
  "type": "string"
}

Examples

curl

curl "https://x402.ottoai.services/chain-status"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://x402.ottoai.services/chain-status");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://x402.ottoai.services/chain-status")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: x402.ottoai.services
Endpoint: https://x402.ottoai.services/chain-status
Machine-readable: /resources/25855.json