x402.asterpay.io

Public API accepting x402 and MPP payments. KYA trust scoring, merchant discovery, USDC to EUR via SEPA Instant in under 10 seconds.

DataLiveeip155:8453Exactvia cdp

https://x402.asterpay.io/v2/x402/ai/sentiment

Calls · 30d

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 10 snapshots so far.

$1.18

Verified settled volume

151 settlements proven x402 by their on-chain EIP-3009 marker.

$0.010

Listed price

As published in the catalog. Always read the live 402 before paying.

Calls · 30d

Upstream's own call count for this endpoint, not ours.

Unique payers · 30d

Last called 2026-09-01 18:55Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "mpp": {
    "sdk": "npm install mppx — or pip install pympp",
    "spec": "https://mpp.dev",
    "methods": [
      "asterpay"
    ],
    "howToPay": [
      "1. Read WWW-Authenticate: Payment header for challenge details",
      "2. Send USDC on Base to the recipient address",
      "3. Retry with Authorization: Payment <credential> containing txHash"
    ],
    "supported": true
  },
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:8453",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v2/x402/ai/sentiment",
      "description": "AI sentiment analysis (GET alias with ?text= query). Paid via x402.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "schema": {
            "type": "object",
            "required": [
              "text"
            ],
            "properties": {
              "text": {
                "type": "string"
              }
            }
          },
          "queryParams": {
            "text": "Bitcoin is looking bullish after the ETF approval."
          }
        },
        "output": {
          "type": "json",
          "example": {
            "score": 0.85,
            "sentiment": "positive",
            "confidence": 0.92
          }
        }
      },
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:137",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v2/x402/ai/sentiment",
      "description": "AI sentiment analysis (GET alias with ?text= query). Paid via x402.",
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:42161",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v2/x402/ai/sentiment",
      "description": "AI sentiment analysis (GET alias with ?text= query). Paid via x402.",
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x0b2C639c533813f4Aa9D7837CAf62653d097Ff85",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:10",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v2/x402/ai/sentiment",
      "description": "AI sentiment analysis (GET alias with ?text= query). Paid via x402.",
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:1",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v2/x402/ai/sentiment",
      "description": "AI sentiment analysis (GET alias with ?text= query). Paid via x402.",
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 300
    },
    {
      "asset": "0x85889c8c714505E0c94b30fcfcF64fE3Ac8FCb20",
      "extra": {
        "name": "USDC",
        "version": "1"
      },
      "payTo": "0xd5f8481D8F25d3966d2010DBf9B47fFbdf745A9E",
      "amount": "10000",
      "scheme": "exact",
      "network": "eip155:1187947933",
      "mimeType": "application/json",
      "resource": "https://x402.asterpay.io/v2/x402/ai/sentiment",
      "description": "AI sentiment analysis (GET alias with ?text= query). Paid via x402.",
      "maxAmountRequired": "10000",
      "maxTimeoutSeconds": 300
    }
  ],
  "howToPay": {
    "mpp": {
      "sdk": "npm install mppx — or pip install pympp",
      "steps": [
        "1. Read WWW-Authenticate: Payment header for challenge",
        "2. Send USDC on Base to the recipient address",
        "3. Retry with header: Authorization: Payment <base64url-credential>"
      ]
    },
    "docs": "https://x402.asterpay.io/docs",
    "x402": {
      "sdk": "npm install @x402/fetch — or pip install x402",
      "steps": [
        "1. Read accepts[0] for payment details (network, asset, amount, payTo)",
        "2. Send USDC on Base via transferWithAuthorization (EIP-3009)",
        "3. Base64-encode the signed payment payload",
        "4. Retry with header: PAYMENT-SIGNATURE: <base64-payload>"
      ]
    },
    "asset": "USDC (native on each chain)",
    "price": "$0.01 USDC",
    "networks": "Base, Polygon, Arbitrum, Optimism, Ethereum",
    "protocols": [
      "x402",
      "mpp"
    ],
    "freeEndpoints": [
      "GET /v2/x402/offramp/estimate?amount={usdc} — free (EUR settlement estimate)",
      "GET /v2/x402/market/rates — free",
      "GET /v1/agent/trust-score/{address} — free",
      "GET /v1/agent/discovery — free",
      "GET /v1/settlement/estimate?amount={usdc} — free",
      "GET /v1/probe/trust-score?address={addr} — free",
      "GET /v1/probe/agents — free",
      "GET /v1/probe/stats — free"
    ]
  },
  "resource": {
    "url": "https://x402.asterpay.io/v2/x402/ai/sentiment",
    "mimeType": "application/json",
    "description": "AI sentiment analysis (GET alias with ?text= query). Paid via x402."
  },
  "extensions": {
    "bazaar": {
      "info": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "text": "Bitcoin is looking bullish after the ETF approval."
          }
        },
        "output": {
          "type": "json",
          "example": {
            "score": 0.85,
            "sentiment": "positive",
            "confidence": 0.92
          }
        }
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "input"
        ],
        "properties": {
          "input": {
            "type": "object",
            "required": [
              "type",
              "method"
            ],
            "properties": {
              "type": {
                "type": "string",
                "const": "http"
              },
              "method": {
                "enum": [
                  "GET",
                  "HEAD",
                  "DELETE"
                ],
                "type": "string"
              },
              "headers": {
                "type": "object",
                "additionalProperties": {
                  "type": "string"
                }
              },
              "queryParams": {
                "type": "object",
                "required": [
                  "text"
                ],
                "properties": {
                  "text": {
                    "type": "string"
                  }
                }
              }
            },
            "additionalProperties": false
          },
          "output": {
            "type": "object",
            "required": [
              "type"
            ],
            "properties": {
              "type": {
                "type": "string"
              },
              "example": {
                "type": "object"
              }
            }
          }
        }
      }
    },
    "payment-identifier": {
      "info": {
        "required": false
      },
      "schema": {
        "type": "object",
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "required": [
          "required"
        ],
        "properties": {
          "id": {
            "type": "string",
            "pattern": "^[a-zA-Z0-9_-]+$",
            "maxLength": 128,
            "minLength": 16
          },
          "required": {
            "type": "boolean"
          }
        }
      }
    }
  },
  "description": "AI sentiment analysis (GET alias with ?text= query). Paid via x402.",
  "x402Version": 2,
  "first_call_free": {
    "how": "Retry with a normally signed PAYMENT-SIGNATURE. If your wallet has never paid AsterPay before, the authorization is verified but NOT settled — your first call costs $0. No opt-in needed.",
    "max_price_usd": 0.02,
    "one_per_wallet": true,
    "requires_balance": true,
    "eligible_endpoint": true,
    "requires_balance_note": "Your wallet must hold at least the endpoint price for your x402/MPP client to sign the authorization. AsterPay verifies but does not settle it, so nothing is deducted. Clients that pre-check balance will refuse to sign below the price.",
    "zero_balance_alternative": "No wallet balance at all? Every endpoint under freeEndpoints below answers with no payment and no signature."
  },
  "example_response": {
    "score": 0.72,
    "rationale": "Positive funding rates and rising spot volume outweigh mixed derivatives signals.",
    "sentiment": "bullish",
    "confidence": 0.88
  }
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.01USDC≈ $0.01 USD

on Base · exact scheme

Pay 0.01 USDC on Base to 0xd5f8…45A9E. The signed payment is good for 5 minutes.

Paid to: 0xd5f8…45A9E
USD Coin contract: 0x8335…02913
Payment window: 5 minutes
As published: 10000 smallest units
Buys: AI-powered sentiment analysis. Send text, get sentiment score + emotions. Paid via x402.
Returns: application/json

10000units

on Polygon · exact scheme