Beauty & Personal Care · x402 · early usage

Academic letter grade with red-pen marginalia for anything

Name: Academic letter grade with red-pen marginalia for anything
Price: 0.01 USD
Availability: InStock

Academic letter grade with red-pen marginalia for anything. $0.01 USDC.

by api.anchor-x402.com · discovered, not yet claimed by its owner · updated 2026-10-08

30d calls6

30d payers3

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

Academic letter grade with red-pen marginalia for anything. $0.01 USDC.

Tags: grade · score · feedback · editor · bazaar · builder-code

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-08

Input example from Bazaar metadata

{
  "target": "def add(a, b): return a - b  # surely this is correct"
}

Output example

{
  "letter_grade": "D",
  "marginalia": [
    "Function name says 'add' but operator says 'subtract' — pick a side.",
    "The comment is the funniest thing in this codebase.",
    "Add a test and your subconscious will thank you."
  ],
  "summary": "Strong vibes, weak math. See me after class."
}

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/27181.json for the price and payment options.
Pay. Call GET https://api.anchor-x402.com/v1/grade. 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, eip155:5042, Polygon, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Solana, eip155:5042, Polygon
Demand: 6 calls · 3 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.01	6apuZvJQ51Led9iEjnHw6f5jfnXL4qjt8S1h58PeXzuR	300s
exact	eip155:5042 eip155:5042	0x3600000000000000000000000000000000000000	10000	0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6	300s
exact	Polygon eip155:137	0x431D5dfF03120AFA4bDf332c61A6e1766eF37BDB	2000000000000000000	0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "6apuZvJQ51Led9iEjnHw6f5jfnXL4qjt8S1h58PeXzuR",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:5042",
    "payTo": "0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6",
    "asset": "0x3600000000000000000000000000000000000000",
    "amount": "10000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x127462e296fAc1A7F5cF33bA57bB2f0FFf5cD0B6",
    "asset": "0x431D5dfF03120AFA4bDf332c61A6e1766eF37BDB",
    "amount": "2000000000000000000",
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "properties": {
        "letter_grade": {
          "enum": [
            "A+",
            "A",
            "A-",
            "B+",
            "B",
            "B-",
            "C+",
            "C",
            "C-",
            "D+",
            "D",
            "F"
          ],
          "type": "string"
        },
        "marginalia": {
          "items": {
            "type": "string"
          },
          "type": "array"
        },
        "summary": {
          "type": "string"
        }
      },
      "required": [
        "letter_grade",
        "marginalia",
        "summary"
      ],
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": {
    "letter_grade": "A+",
    "marginalia": [
      "string"
    ],
    "summary": "string"
  },
  "type": "string"
}

Examples

curl

curl -X POST 'https://api.anchor-x402.com/v1/grade' -H 'Content-Type: application/json' --data '{"target":"def add(a, b): return a - b  # surely this is correct"}'
# -> 402 Payment Required; read PAYMENT-REQUIRED
# retry the identical request with PAYMENT-SIGNATURE

JavaScript

const res = await fetch("https://api.anchor-x402.com/v1/grade", {
  "method": "POST",
  "headers": {
    "content-type": "application/json"
  },
  "body": "{\"target\":\"def add(a, b): return a - b  # surely this is correct\"}"
});
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
import json
res = httpx.request("POST", "https://api.anchor-x402.com/v1/grade", json=json.loads("{\"target\":\"def add(a, b): return a - b  # surely this is correct\"}"))
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: api.anchor-x402.com
Endpoint: https://api.anchor-x402.com/v1/grade
Machine-readable: /resources/27181.json