Blockchain Data · x402 · early usage

Return one bounded current EVM fee-history snapshot for a fixed supported chain using S…

by http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run · discovered, not yet claimed by its owner · updated 2026-10-09

30d calls2

30d payers2

MethodPOST

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

Return one bounded current EVM fee-history snapshot for a fixed supported chain using SolidRPC public JSON-RPC. Forest reports recent base-fee and latest sampled-block priority-fee percentile evidence only; it does not estimate a caller transaction gas limit, simulate, sign or broadcast a transaction, access a wallet, choose a transaction fee for the caller or guarantee an optimal fee. Base mainnet USDC

Tags: evm · gas · fees · fee-history · base-fee · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-09

Input example from Bazaar metadata

{
  "chain": "base"
}

Output example

{
  "capability": "chain.gas-snapshot",
  "data": {
    "base_fee": {
      "latest_wei": "1",
      "next_wei": "1"
    },
    "cache_age_ms": 0,
    "chain": "ethereum",
    "chain_id": 1,
    "freshness": "current_upstream_snapshot",
    "gas_used_ratio": [
      0,
      0,
      0,
      0
    ],
    "oldest_block": "1",
    "priority_fee_percentiles_wei": {
      "p25": "1",
      "p50": "1",
      "p90": "1"
    },
    "sampled_blocks": 4,
    "source": "SolidRPC public EVM JSON-RPC",
    "source_method": "eth_feeHistory",
    "transaction_broadcast": false,
    "transaction_simulated": false
  },
  "meta": {
    "cache": "miss",
    "checked_at": "2026-01-01T00:00:00.000Z",
    "duration_ms": 0,
    "provider": "solidrpc-public"
  },
  "ok": true,
  "version": "1"
}

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/33967.json for the price and payment options.
Pay. Call GET https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/chain/gas-snapshot. 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, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.002 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 2 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.002	0xf9c2a7255E7C51D7BF38331DcFC23Ba881cF61Ba	120s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xf9c2a7255E7C51D7BF38331DcFC23Ba881cF61Ba",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000",
    "amountUsd": 0.002,
    "maxTimeoutSeconds": 120
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "additionalProperties": false,
      "properties": {
        "capability": {
          "const": "chain.gas-snapshot",
          "description": "Public capability value used to scope this lookup."
        },
        "data": {
          "additionalProperties": false,
          "description": "Public data value used to scope this lookup.",
          "properties": {
            "base_fee": {
              "additionalProperties": false,
              "description": "Public base fee value used to scope this lookup.",
              "properties": {
                "latest_wei": {
                  "description": "Public latest wei value used to scope this lookup.",
                  "pattern": "^(?:0|[1-9]\\d*)$",
                  "type": "string"
                },
                "next_wei": {
                  "description": "Public next wei value used to scope this lookup.",
                  "pattern": "^(?:0|[1-9]\\d*)$",
                  "type": "string"
                }
              },
              "required": [
                "latest_wei",
                "next_wei"
              ],
              "type": "object"
            },
            "cache_age_ms": {
              "description": "Public cache age ms value used to scope this lookup.",
              "maximum": 60000,
              "minimum": 0,
              "type": "integer"
            },
            "chain": {
              "description": "Public chain value used to scope this lookup.",
              "enum": [
                "ethereum",
                "optimism",
                "bnb",
                "polygon",
                "base",
                "arbitrum",
                "avalanche"
              ],
              "type": "string"
            },
            "chain_id": {
              "description": "Public chain id value used to scope this lookup.",
              "minimum": 1,
              "type": "integer"
            },
            "freshness": {
              "const": "current_upstream_snapshot",
              "description": "Public freshness value used to scope this lookup."
            },
            "gas_used_ratio": {
              "description": "Public gas used ratio value used to scope this lookup.",
              "items": {
                "maximum": 1,
                "minimum": 0,
                "type": "number"
              },
              "maxItems": 4,
              "minItems": 4,
              "type": "array"
            },
            "oldest_block": {
              "description": "Public oldest block value used to scope this lookup.",
              "pattern": "^(?:0|[1-9]\\d*)$",
              "type": "string"
            },
            "priority_fee_percentiles_wei": {
              "additionalProperties": false,
              "description": "Public priority fee percentiles wei value used to scope this lookup.",
              "properties": {
                "p25": {
                  "description": "Public p25 value used to scope this lookup.",
                  "pattern": "^(?:0|[1-9]\\d*)$",
                  "type": "string"
                },
                "p50": {
                  "description": "Public p50 value used to scope this lookup.",
                  "pattern": "^(?:0|[1-9]\\d*)$",
                  "type": "string"
                },
                "p90": {
                  "description": "Public p90 value used to scope this lookup.",
                  "pattern": "^(?:0|[1-9]\\d*)$",
                  "type": "string"
                }
              },
              "required": [
                "p25",
                "p50",
                "p90"
              ],
              "type": "object"
            },
            "sampled_blocks": {
              "const": 4,
              "description": "Public sampled blocks value used to scope this lookup."
            },
            "source": {
              "const": "SolidRPC public EVM JSON-RPC",
              "description": "Public source value used to scope this lookup."
            },
            "source_method": {
              "const": "eth_feeHistory",
              "description": "Public source method value used to scope this lookup."
            },
            "transaction_broadcast": {
              "const": false,
              "description": "Public transaction broadcast value used to scope this lookup."
            },
            "transaction_simulated": {
              "const": false,
              "description": "Public transaction simulated value used to scope this lookup."
            }
          },
          "required": [
            "chain",
            "chain_id",
            "oldest_block",
            "sampled_blocks",
            "base_fee",
            "priority_fee_percentiles_wei",
            "gas_used_ratio",
            "source",
            "source_method",
            "freshness",
            "transaction_simulated",
            "transaction_broadcast",
            "cache_age_ms"
          ],
          "type": "object"
        },
        "meta": {
          "additionalProperties": false,
          "description": "Public meta value used to scope this lookup.",
          "properties": {
            "cache": {
              "description": "Public cache value used to scope this lookup.",
              "enum": [
                "hit",
                "miss",
                "bypass"
              ]
            },
            "checked_at": {
              "description": "Public checked at value used to scope this lookup.",
              "type": "string"
            },
            "duration_ms": {
              "description": "Public duration ms value used to scope this lookup.",
              "minimum": 0,
              "type": "integer"
            },
            "provider": {
              "description": "Public provider value used to scope this lookup.",
              "type": [
                "string",
                "null"
              ]
            }
          },
          "required": [
            "provider",
            "checked_at",
            "cache",
            "duration_ms"
          ],
          "type": "object"
        },
        "ok": {
          "const": true,
          "description": "Public ok value used to scope this lookup."
        },
        "version": {
          "const": "1",
          "description": "Package version whose public metadata should be checked."
        }
      },
      "required": [
        "ok",
        "capability",
        "version",
        "data",
        "meta"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {
    "capability": null,
    "data": {
      "base_fee": {
        "latest_wei": "string",
        "next_wei": "string"
      },
      "cache_age_ms": 0,
      "chain": "ethereum",
      "chain_id": 0,
      "freshness": null,
      "gas_used_ratio": [
        0
      ],
      "oldest_block": "string",
      "priority_fee_percentiles_wei": {
        "p25": "string",
        "p50": "string",
        "p90": "string"
      },
      "sampled_blocks": null,
      "source": null,
      "source_method": null,
      "transaction_broadcast": null,
      "transaction_simulated": null
    },
    "meta": {
      "cache": "hit",
      "checked_at": "string",
      "duration_ms": 0,
      "provider": "string"
    },
    "ok": null,
    "version": null
  },
  "type": "string"
}

Examples

curl

curl "https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/chain/gas-snapshot"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/chain/gas-snapshot");
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://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/chain/gas-snapshot")
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: http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run
Endpoint: https://http--forest-gas-station-mainnet--lcjl27p8lmjs.code.run/chain/gas-snapshot
Machine-readable: /resources/33967.json