Mutate a known-good seed's sound (classic sfxr mutate) — nearby variations by parameter pe

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x54ebFCF3870439B9db62381848c5DabC05c70d5B",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "maxTimeoutSeconds": 60
  }
]

{
  "bazaar": {
    "category": "audio",
    "info": {
      "input": {
        "method": "GET",
        "queryParams": {
          "amount": "Mutation magnitude.",
          "bits": "Bit depth. Overrides the format profile; the override is echoed in formatOverride.",
          "format": "Fidelity profile: wav is 44.1k/16, wav8 is 44.1k/8, retro is 22k/8. Explicit bits/sampleRate override it.",
          "preset": "Base preset. Omit for a random base.",
          "sampleRate": "Sample rate in Hz. Overrides the format profile; the override is echoed in formatOverride.",
          "seed": "Integer seed of the base sound. Omit for a random seed."
        },
        "type": "http"
      },
      "output": {
        "properties": {
          "amount": {
            "type": "number"
          },
          "bitsPerSample": {
            "enum": [
              8,
              16
            ],
            "type": "integer"
          },
          "byteLength": {
            "description": "Total WAV size in bytes.",
            "type": "integer"
          },
          "clipped": {
            "description": "Samples clamped to range (0 = clean).",
            "type": "integer"
          },
          "durationMs": {
            "type": "integer"
          },
          "format": {
            "description": "The fidelity profile actually rendered (not necessarily the one requested).",
            "enum": [
              "wav16",
              "wav8",
              "retro",
              "custom"
            ],
            "type": "string"
          },
          "formatOverride": {
            "description": "Only present when explicit bits/sampleRate overrode the requested `format`.",
            "properties": {
              "applied": {
                "enum": [
                  "wav16",
                  "wav8",
                  "retro",
                  "custom"
                ],
                "type": "string"
              },
              "detail": {
                "type": "string"
              },
              "overriddenBy": {
                "items": {
                  "enum": [
                    "bits",
                    "sampleRate"
                  ],
                  "type": "string"
                },
                "type": "array"
              },
              "requested": {
                "description": "The `format` the caller sent.",
                "type": "string"
              }
            },
            "required": [
              "requested",
              "applied",
              "overriddenBy",
              "detail"
            ],
            "type": "object"
          },
          "mimeType": {
            "enum": [
              "audio/wav"
            ],
            "type": "string"
          },
          "params": {
            "description": "SFXR synthesis parameters. wave_type: 0=square,1=sawtooth,2=sine,3=noise. All p_* are on [0,1] except SIGNED ones on [-1,1]. sample_rate/sample_size reflect the chosen output.",
            "properties": {
              "p_arp_mod": {
                "description": "SIGNED [-1,1]",
                "type": "number"
              },
              "p_arp_speed": {
                "type": "number"
              },
              "p_base_freq": {
                "type": "number"
              },
              "p_duty": {
                "type": "number"
              },
              "p_duty_ramp": {
                "description": "SIGNED [-1,1]",
                "type": "number"
              },
              "p_env_attack": {
                "type": "number"
              },
              "p_env_decay": {
                "type": "number"
              },
              "p_env_punch": {
                "type": "number"
              },
              "p_env_sustain": {
                "type": "number"
              },
              "p_freq_dramp": {
                "description": "SIGNED [-1,1]",
                "type": "number"
              },
              "p_freq_limit": {
                "type": "number"
              },
              "p_freq_ramp": {
                "description": "SIGNED [-1,1]",
                "type": "number"
              },
              "p_hpf_freq": {
                "type": "number"
              },
              "p_hpf_ramp": {
                "description": "SIGNED [-1,1]",
                "type": "number"
              },
              "p_lpf_freq": {
                "type": "number"
              },
              "p_lpf_ramp": {
                "description": "SIGNED [-1,1]",
                "type": "number"
              },
              "p_lpf_resonance": {
                "type": "number"
              },
              "p_pha_offset": {
                "description": "SIGNED [-1,1]",
                "type": "number"
              },
              "p_pha_ramp": {
                "description": "SIGNED [-1,1]",
                "type": "number"
              },
              "p_repeat_speed": {
                "type": "number"
              },
              "p_vib_speed": {
                "type": "number"
              },
              "p_vib_strength": {
                "type": "number"
              },
              "sample_rate": {
                "type": "integer"
              },
              "sample_size": {
                "enum": [
                  8,
                  16
                ],
                "type": "integer"
              },
              "sound_vol": {
                "type": "number"
              },
              "wave_type": {
                "enum": [
                  0,
                  1,
                  2,
                  3
                ],
                "type": "integer"
              }
            },
            "type": "object"
          },
          "preset": {
            "type": "string"
          },
          "sampleCount": {
            "type": "integer"
          },
          "sampleRate": {
            "type": "integer"
          },
          "seed": {
            "description": "The integer seed used — pass it back for byte-identical output.",
            "type": "integer"
          },
          "wav_base64": {
            "description": "Base64-encoded WAV (RIFF PCM, mono).",
            "type": "string"
          }
        },
        "required": [
          "seed",
          "wav_base64",
          "params"
        ],
        "type": "object"
      }
    },
    "routeTemplate": "https://x402.professorsausages.com/sfx/mutate",
    "schema": {
      "properties": {
        "input": {
          "type": "object"
        },
        "output": {
          "type": "object"
        }
      },
      "required": [
        "input"
      ],
      "type": "object"
    }
  },
  "catalog": {
    "catalogUrl": "https://x402.professorsausages.com/?ref=402&v=minimal&from=sfx",
    "message": "This endpoint is 1 of 35 pay-per-call APIs for agents — all same x402 payment + auth. Browse the full menu free (no payment) at the catalog URL; every API serves a free real sample record at /<api>/sample.",
    "strategy": "minimal"
  },
  "discount": {
    "header": "X-Intent",
    "hint": "Send X-Intent: <40+ chars describing what you're building and what data you need> for 50% off this call.",
    "off": "50%"
  },
  "help": {
    "docs": "https://x402.professorsausages.com/sfx",
    "example": "https://x402.professorsausages.com/sfx/mutate",
    "openapi": "https://x402.professorsausages.com/sfx/openapi.json",
    "sample": "https://x402.professorsausages.com/sfx/sample"
  },
  "sample": {
    "hint": "A real cached response from this API (with its capture timestamp), free — judge the data quality before paying.",
    "url": "https://x402.professorsausages.com/sfx/sample"
  },
  "suggest": {
    "hint": "Missing data you'd pay for? POST {want, would_pay_usd} — free. The most-requested datasets get built first.",
    "url": "https://x402.professorsausages.com/suggest"
  }
}

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

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

import httpx
res = httpx.get("https://x402.professorsausages.com/sfx/mutate")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header