# Fathom Token Exit Assessment

> Fathom Token Exit Assessment is a paid API for AI agents from fathom-api.mioku-fathom.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-28).

Assesses exit liquidity and price trust for a Base ERC-20 token at a specified USD position size, returning a verdict (tradeable/caution/illiquid/unverified) with executable proceeds, price impact, and confidence metrics across Aerodrome, Slipstream, and Uniswap V2/V3/V4.

## Facts

- Endpoint: GET https://fathom-api.mioku-fathom.workers.dev/v1/assess?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-28
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fathom-token-exit-assessment-29fa0240
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_0rUABfAqUIGCSvS6j1Cne

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fathom-token-exit-assessment-29fa0240
```

Example prompt: Can you assess my exit liquidity for token 0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed on Base — I'm thinking of selling a $25,000 position and want to know if I'll get a good price or if there's too much slippage.

## When to prefer this

Use this endpoint when you need a real on-chain sell quote at a specific USD position size on Base, aggregated across Aerodrome, Slippage, and Uniswap V2/V3/V4 — not an interpolated estimate. It is especially valuable before executing large exits where slippage and liquidity depth matter, or when you need a trustworthiness signal (price_trust) alongside the quote. Prefer it over generic price feeds when you need executable confidence rather than spot price.

## Known failure modes

- Invalid token address format (must be 0x-prefixed 40-char hex) returns validation error
- Token not found on Base chain returns unverified verdict
- size_usd outside allowed range (1–10,000,000) rejected
- No liquidity found on any supported DEX returns illiquid verdict
- On-chain RPC errors may cause partial or failed quotes
- Payment failure via x402 protocol blocks request

## How this service works

Exit-liquidity and price-trust assessment for a Base ERC-20 token at a requested USD position size. On-chain sell quotes cover Aerodrome, Slipstream, and Uniswap V2/V3/V4. Returns tradeable, caution, illiquid, or unverified with executable proceeds, price impact, confidence, concerns, and unmeasured checks. Inputs: token address and size_usd.

## Output

Returns a structured assessment including: a verdict label (tradeable, caution, illiquid, or unverified), executable proceeds in USD, price impact percentage, confidence score, a reason summary, price_trust rating, list of concerns or risk flags, asset_type, and notes on unmeasured checks. For tokenized equity (b20) tokens, may also include underlying stock, multiplier, paused status, and policy restrictions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "token"
     ],
     "properties": {
      "chain": {
       "enum": [
        "base"
       ],
       "type": "string",
       "default": "base"
      },
      "token": {
       "type": "string",
       "pattern": "^0x[a-fA-F0-9]{40}$",
       "description": "Base ERC-20 token address"
      },
      "size_usd": {
       "type": "number",
       "default": 10000,
       "maximum": 10000000,
       "minimum": 1,
       "description": "The sale you are contemplating, in USD. Quoted on chain at exactly this size rather than interpolated between standard sizes. Pass the position you actually hold."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "token",
      "chain",
      "verdict",
      "reason",
      "size_usd",
      "exit",
      "price_trust",
      "asset_type"
     ],
     "properties": {
      "b20": {
       "type": "object",
       "required": [
        "underlying",
        "multiplier",
        "corporate_action_pending",
        "paused",
        "policy_restricted"
       ],
       "properties": {
        "paused": {
         "type": [
          "boolean",
          "null"
         ],
         "description": "Transfers paused on chain by the issuer. This blocks a sale outright."
        },
        "multiplier": {
         "type": [
          "number",
          "null"
         ],
         "description": "How many underlying shares one token is redeemable for. One token is NOT permanently one share: dividends and splits move this. null means it could not be read, never 1.0 by default."
        },
        "underlying": {
         "type": [
          "string",
          "null"
         ],
         "description": "The equity this token represents, for verified stocks only."
        },
        "effective_at": {
         "type": [
          "string",
          "null"
 
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fathom-token-exit-assessment-29fa0240/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fathom-api.mioku-fathom.workers.dev](https://www.zero.xyz/host/fathom-api.mioku-fathom.workers.dev/llms.txt)