Payments · x402 · early usage

Introductory pricing

Name: Introductory pricing
Price: 0.005 USD
Availability: InStock

by api.neurodynamic.tech · discovered, not yet claimed by its owner · updated 2026-10-10

30d calls5

30d payers5

MethodPOST

Outputbinary

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

Introductory pricing. Catalogue narration: 0.005 USDC on Base, up to 1,000 characters, MP3. Seven English voices. No account, reference upload or human approval. Read https://api.neurodynamic.tech/narration. Authorisation verified before work; settlement after successful audio. Retry identical body and proof for 12 hours without a second charge. Generated audio may be reviewed privately by the operator during this temporary quality-review period. Quoted tier price: 0.005 USDC.

Tags: bazaar

Call contract

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

Input example from Bazaar metadata

{
  "input": "Hello from NeuroDynamic.",
  "voice": "bf_emma"
}

Output example

"<MP3 bytes>"

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/38467.json for the price and payment options.
Pay. Call GET https://api.neurodynamic.tech/v1/audio/speech. 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: $0.005 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base
Demand: 5 calls · 5 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.005	0xa369aC3412360206DB63507b190E691c0C5B9F3e	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xa369aC3412360206DB63507b190E691c0C5B9F3e",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "amountUsd": 0.005,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "description": "Binary audio/mpeg; PAYMENT-RESPONSE receipt header",
      "type": "string"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

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

{
  "example": "string",
  "type": "string"
}

Examples

curl

curl "https://api.neurodynamic.tech/v1/audio/speech"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://api.neurodynamic.tech/v1/audio/speech");
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://api.neurodynamic.tech/v1/audio/speech")
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.neurodynamic.tech
Endpoint: https://api.neurodynamic.tech/v1/audio/speech
Machine-readable: /resources/38467.json